CN105264795A

CN105264795A - Registration activation method, device and system for orthogonal frequency division multiplexing passive optical network

Info

Publication number: CN105264795A
Application number: CN201380003033.5A
Authority: CN
Inventors: 叶飞
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2013-12-31
Filing date: 2013-12-31
Publication date: 2016-01-20
Anticipated expiration: 2033-12-31
Also published as: CN105264795B; WO2015100651A1

Abstract

Provided are a registration activation method, device and system for an orthogonal frequency division multiplexing passive optical network. A registration activation method for an orthogonal frequency division multiplexing passive optical network, comprising: sending, by an optical line terminal, a downlink training sequence to an authenticated optical network unit; receiving, by the optical line terminal, a downlink bit bearer table of the optical network unit and an uplink training sequence which are sent by the optical network unit, the downlink bit bearer table of the optical network unit being calculated by the optical network unit according to the downlink training sequence; calculating, by the optical line terminal, an uplink bit bearer table of the optical network unit according to the uplink training sequence; calculating and updating, by the optical line terminal, a system downlink bit bearer table and a system uplink bit bearer table according to the downlink bit bearer table of the optical network unit and the uplink bit bearer table of the optical network unit, and sending the system downlink bit bearer table and the system uplink bit bearer table to the optical network unit, so that the optical network unit updates the system downlink bit bearer table and the system uplink bit bearer table.

Description

Registration activation method, device and system for orthogonal frequency division multiplexing passive optical network

Orthogonal frequency division multiplexing passive optical network registration activation method, device and system technical field

The present embodiments relate to optical communication field, more particularly to a kind of orthogonal frequency division multiplexing passive optical network registration activation method, device and system.Background technology

Orthogonal step person point multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) it is a kind of multi-carrier modulation technology, apply it to optical communication field and generate light OFDM (Optical Orthogonal Frequency Division Multiplexing, OOFDM) technology.OFDM-PON is a kind of EPON based on OOFDM technologies（Passive Optical Network, PON) .

OFDM-PON by office side optical line terminal（Optical Line Terminal, OLT), the optical network unit of user side（Optical Network Unit, ONU) or ONT Optical Network Terminal（Optical Network Terminal, ONT) and Optical Distribution Network（Optical Distribution Network, ODN) composition, usually, ONU and ONT are referred to as ONU.

OFDM-PON mainly has the OFDM-PON of Single wavelength, based on Nai Kuitesi（Nyquist) OFDM-PON of multiplexing technology, based on wavelength-division multiplex（Wavelength Division Multiplexing, WDM) several different network architectures of multi-wavelength OFDM-PON.

Due to being had differences in OFDM-PON systems between each subcarrier, therefore when transmitting data using different sub-carrier between OLT and ONU, the bit bearing value of each subcarrier（The maximum number bits that can be carried）Difference, and in current OFDM-PON systems, ONU is registered after activation in the olt, the bit bearing value of OLT is not aware that when data are transmitted between ONU each subcarrier, causes the link capacity of OFDM-PON systems not to be maximized utilization.The content of the invention

The embodiment of the present invention provides a kind of orthogonal frequency division multiplexing passive optical network registration activation method, device and system, the link capacity for maximally utilizing OFDM-PON systems.

First aspect provides a kind of orthogonal frequency division multiplexing passive optical network registration activation method, including： Optical line terminal sends descending training sequence to the optical network unit by certification；The optical line terminal receives the downstream bits carrying table and up training sequence for the optical network unit that the optical network unit is sent, and the downstream bits carrying table of the optical network unit is that the optical network unit is calculated according to the descending training sequence；

The upstream bits that the optical line terminal calculates the optical network unit according to the up training sequence carry table；

The optical line terminal is calculated according to the downstream bits carrying table of the optical network unit and the upstream bits carrying meter of the optical network unit and updates system descending bit carrying table and system uplink bit carrying table；

The optical line terminal sends the system descending bit to the optical network unit and carries table and system uplink bit carrying table, so that the optical network unit updates the system descending bit carrying table and system uplink bit carrying table.

In first aspect in the first possible implementation, the upstream bits that the optical line terminal calculates the optical network unit according to the up training sequence carry table, including：

The optical line terminal calculates the signal to noise ratio for each uplink sub-carrier for receiving the up training sequence according to the up training sequence；

The upstream bits of optical line terminal optical network unit according to the signal-to-noise ratio computation for each uplink sub-carrier for receiving the up training sequence carry table.

With reference to first aspect or first aspect the first possible implementation, in second of possible implementation, the optical line terminal is calculated according to the downstream bits carrying table of the optical network unit and the upstream bits carrying meter of the optical network unit and updates system descending bit carrying table and system uplink bit carrying table, including Γ

The less one bit bearing value as the downlink sub-carrier in the bit bearing value of optical line terminal downlink sub-carrier that the downstream bits carrying table of system descending bit carrying table and the optical network unit is identical, to update the system descending bit carrying table；

The less one bit bearing value as the uplink sub-carrier in the bit bearing value of optical line terminal uplink sub-carrier that the upstream bits carrying table of system uplink bit carrying table and the optical network unit is identical, to update the system uplink bit carrying table；Or the upstream bits that the upstream bits of the optical network unit carry table and other optical network units are carried table collectively as system uplink bit carrying table by the optical line terminal. With reference to first aspect into second of possible implementation of first aspect any possible implementation, in the third possible implementation, the optical line terminal sends the system descending bit to the optical network unit and carries table and system uplink bit carrying table, so that after the optical network unit renewal system descending bit carrying table and system uplink bit carrying table, in addition to：

The optical line terminal sends the second distance measurement request message to the optical network unit；

The optical line terminal receives the second ranging response message that the optical network unit is sent, to obtain the second distance measurement result.

With reference to any possible implementation in first aspect to first aspect the third possible implementation, in the 4th kind of possible implementation, the optical line terminal to before sending descending training sequence by the optical network unit of certification, in addition to：

The optical line terminal carries table to optical network unit transmission login request message using acquiescence downstream bits；

The optical line terminal receives the optical network unit and carries the registration reply message that table is sent using default upstream bit, and the registration reply message includes the sequence number of the optical network unit；

The optical line terminal determines that the optical network unit that the optical network unit that the sequence number is represented has been represented by certification and for the sequence number distributes optical network unit marks；

The optical line terminal sends the optical network unit marks to the optical network unit.

With reference to the 4th kind of possible implementation of first aspect, in the 5th kind of possible implementation, the optical line terminal determines that the optical network unit that the optical network unit that the sequence number is represented has been represented by certification and for the sequence number distributes optical network unit marks, including：

If the optical line terminal determines that the optical network unit of the sequence number representative is configured and is activated, the optical line terminal determines that the optical network unit that the optical network unit that the sequence number is represented has been represented by certification and for the sequence number distributes the optical network unit marks.

With reference to the 4th kind of possible implementation of first aspect, in the 6th kind of possible implementation, the optical line terminal determines that the optical network unit that the optical network unit that the sequence number is represented has been represented by certification and for the sequence number distributes optical network unit marks, including：

If the optical line terminal determines that the optical network unit of the sequence number representative is configured but is not activated, the optical line terminal sends authentication request message to the optical network unit；

The optical line terminal receives the authentication response message that the optical network unit is sent, and the authentication response message includes the certification mark and/or certification password of the optical network unit； If the optical line terminal determines that the sequence number of the optical network unit and the certification mark of the optical network unit and/or certification password are legal, the optical line terminal determines that the optical network unit that the optical network unit that the sequence number is represented has been represented by certification and for the sequence number distributes the optical network unit marks.

With reference to the 4th kind of possible implementation of first aspect, in the 7th kind of possible implementation, the optical line terminal determines that the optical network unit that the optical network unit that the sequence number is represented has been represented by certification and for the sequence number distributes optical network unit marks, including：

It is not activated if the optical line terminal determines that the sequence number of the optical network unit is not configured, the optical line terminal is that the optical network unit distributes interim optical network unit marks；

The optical line terminal sends authentication request message to the optical network unit；

The optical line terminal receives the authentication response message that the optical network unit is sent, and the authentication response message includes the certification mark and/or certification password of the optical network unit；

If the optical line terminal determines that the sequence number of the optical network unit and the certification mark of the optical network unit and/or certification password are legal, the optical line terminal determines the optical network unit by certification；

The optical line terminal sends lower line to the optical network unit, and discharges the casual network mark；

The optical line terminal resends the login request message to the optical network unit；The optical line terminal receives the registration reply message that the optical network unit is resend, and the optical network unit represented for the sequence number distributes the optical network unit marks.

With reference to the 7th kind of possible implementation of first aspect, in the 8th kind of possible implementation, the optical line terminal is sent to the optical network unit before authentication request message, in addition to：

The optical line terminal sends the 3rd distance measurement request message to the optical network unit；

The optical line terminal receives the 3rd ranging response message that the optical network unit is sent, to obtain the 3rd distance measurement result.

With reference to any possible implementation in the 4th kind to the 8th kind possible implementation of first aspect, in the 9th kind of possible implementation, the optical line terminal sends login request message using acquiescence downstream bits carrying table to the optical network unit to be included：

The optical line terminal uses acquiescence downstream bits to carry table to optical network unit transmission login request message in the spectral range or all downstream spectrum scopes or management passage of acquiescence. With reference to the 9th kind of possible implementation of first aspect, in the tenth kind of possible implementation, the optical line terminal is received before the first ranging response message that the optical network unit is sent, in addition to：The optical line terminal sends frequency spectrum distribution information to the optical network unit, so that spectrum operation scope is adjusted to target wave band by the optical network unit according to frequency spectrum distribution information by the electric tunable filter of regulation.

With reference to the 9th kind of possible implementation of first aspect, in a kind of the tenth possible implementation, the optical line terminal is resend to the optical network unit before the login request message, in addition to：The optical line terminal sends frequency spectrum distribution information to the optical network unit, so that spectrum operation scope is adjusted to target wave band by the optical network unit according to frequency spectrum distribution information by the electric tunable filter of regulation.

With reference to any possible implementation in the 4th kind to the 8th kind possible implementation of first aspect, in the 12nd kind of possible implementation, the optical line terminal sends login request message using acquiescence downstream bits carrying table to the optical network unit to be included：

The optical line terminal carries table to optical network unit transmission login request message in the initial wavelength or public administration wavelength of all downstream wavelengths or acquiescence using acquiescence downstream bits；

The optical line terminal receives the optical network unit and carries the registration reply message that table is sent using default upstream bit, including：

The optical line terminal receives the optical network unit includes the sequence number of the optical network unit by adjusting the registration reply message sent after light adjustable transmitter in any upstream wavelength or upstream wavelength corresponding with the downstream wavelength that the reception optical network unit sends login request message using default upstream bit carrying table, the registration reply message.

With reference to the 12nd kind of possible implementation of first aspect, in the 13rd kind of possible implementation, the optical line terminal is received before the first ranging response message that the optical network unit is sent, in addition to：The optical line terminal is that the optical network unit distributes upstream wavelength and downstream wavelength；

The optical line terminal sends Wavelength Assignment information to the optical network unit, so that the optical network unit adjusts the wavelength of the optical network unit optical sender and photoreceiver according to the Wavelength Assignment information.

With reference to the 12nd kind of possible implementation of first aspect, in the 14th kind of possible implementation, the optical line terminal is resend to the optical network unit before the login request message, in addition to：The optical line terminal is that the optical network unit distributes upstream wavelength and downstream wavelength； The optical line terminal sends Wavelength Assignment information to the optical network unit, so that the optical network unit adjusts the wavelength of the optical network unit optical sender and photoreceiver according to the Wavelength Assignment information.

Second aspect provides a kind of orthogonal frequency division multiplexing passive optical network registration activation method, including：The descending training sequence that optical line terminal is sent is received by the optical network unit of certification；The downstream bits that the optical network unit calculates the optical network unit according to the descending training sequence carry table；

The downstream bits that the optical network unit sends the optical network unit to the optical line terminal carry table and up training sequence, so that the optical line terminal is calculated according to the upstream bits carrying meter of the upstream bits carrying table of the up training sequence calculating optical network unit and the downstream bits carrying table according to the optical network unit and the optical network unit and updates system descending bit carrying table and system uplink bit carrying table；

The optical network unit receives and updated the system descending bit carrying table and the system uplink bit carrying table that the optical line terminal is sent.

In second aspect in the first possible implementation, the downstream bits that the optical network unit calculates the optical network unit according to the descending training sequence carry table, including：

The optical network unit calculates the signal to noise ratio for each downlink sub-carrier for receiving the descending training sequence according to the descending training sequence；

The downstream bits of optical network unit optical network unit according to the signal-to-noise ratio computation for each downlink sub-carrier for receiving the descending training sequence carry table.

With reference to second aspect or second aspect the first possible implementation, in second of possible implementation, the optical network unit is received and updated after the downstream bits carrying table and upstream bits carrying table that the optical line terminal sends, in addition to：

The optical network unit receives the second distance measurement request message that the optical line terminal is sent；The optical network unit sends second of ranging response message to the optical line terminal, so that the optical line terminal obtains the second distance measurement result.

With reference to second aspect into second of possible implementation of second aspect any possible implementation, in the third possible implementation, it is described the descending training sequence that optical line terminal is sent is received by the optical network unit of certification before, in addition to：

The optical network unit receives the note that the optical line terminal is sent using acquiescence downstream bits carrying table Volume request message；

The optical network unit sends registration reply message using default upstream bit carrying table, and the registration reply message includes the sequence number of the optical network unit；

The optical network unit receives the optical network unit marks that the optical line terminal is sent, and the optical network unit marks are that the optical line terminal determines the optical network unit of the sequence number representative by being that the optical network unit that the sequence number is represented is distributed after certification.

The third possible implementation with reference to second aspect, in the 4th kind of possible implementation, the optical network unit receives the optical network unit marks that the optical line terminal is sent, the optical network unit marks are that the optical line terminal determines optical network unit that the sequence number represents by being that the optical network unit that the sequence number is represented is distributed after certification, including：

The optical network unit receives the optical network unit marks that the optical line terminal is sent, and it after the optical line terminal determines that optical network unit that the sequence number is represented is configured and is activated is that the optical network unit that the sequence number is represented is distributed that the optical network unit marks, which are,.

The third possible implementation with reference to second aspect, in the 5th kind of possible implementation, the optical network unit receives the optical network unit marks that the optical line terminal is sent, the optical network unit marks are that the optical line terminal determines optical network unit that the sequence number represents by being that the optical network unit that the sequence number is represented is distributed after certification, including：

The optical network unit receives the authentication request message that the optical line terminal is sent, and the authentication request message is that the optical line terminal determines that optical network unit that the sequence number is represented is configured but is sent to after not being activated；

The optical network unit sends authentication response message to the optical line terminal, and the authentication response message includes the certification mark and/or certification password of the optical network unit；

The optical network unit receives the optical network unit marks that the optical line terminal is sent, and the optical network unit marks are that the optical line terminal determines that the sequence number of the optical network unit is distributed with the optical network unit that the certification mark of the optical network unit and/or certification password are the sequence number representative after legal.

The third possible implementation with reference to second aspect, in the 6th kind of possible implementation, the optical network unit receives the optical network unit marks that the optical line terminal is sent, the optical network unit marks are that the optical line terminal determines optical network unit that the sequence number represents by being that the optical network unit that the sequence number is represented is distributed after certification, including：

The optical network unit receives the authentication request message that the optical line terminal is sent, and the certification please Seeking message includes interim optical network unit marks, the authentication request message be the optical line terminal determine the sequence number of the optical network unit do not configure be not activated after be sent to；

The optical network unit receives the lower line that the optical line terminal is sent, and the lower line sends for the certification mark and/or certification password of the sequence number of optical network unit described in the optical line terminal and the optical network unit after legal；

The optical network unit receives the login request message that the optical line terminal is resend；The optical network unit resends the registration reply message to the optical line terminal；The optical network unit receives the optical network unit marks that the optical line terminal is sent.

With reference to the 6th kind of possible implementation of second aspect, in the 7th kind of possible implementation, the optical network unit is received before the authentication request message that the optical line terminal is sent, in addition to：

The optical network unit receives the 3rd distance measurement request message that the optical line terminal is sent；The optical network unit sends the 3rd ranging response message to the optical line terminal, so that the optical line terminal obtains the 3rd distance measurement result.

With reference to the third any possible implementation into the 7th kind of possible implementation of second aspect, in the 8th kind of possible implementation, the optical network unit receives the optical line terminal to be included using the login request message of acquiescence downstream bits carrying table transmission：

The optical network unit receives the login request message that the optical line terminal is sent in the spectral range or all downstream spectrum scopes or management passage of acquiescence using acquiescence downstream bits carrying table.

With reference to the 8th kind of possible implementation of second aspect, in the 9th kind of possible implementation, the optical network unit is sent to the optical line terminal before the first ranging response message, in addition to：

The optical network unit receives the frequency spectrum distribution information that the optical line terminal is sent；

Spectrum operation scope is adjusted to target wave band by the optical network unit according to frequency spectrum distribution information by the electric tunable filter of regulation.

With reference to the 8th kind of possible implementation of second aspect, in the tenth kind of possible implementation, the optical network unit is received before the login request message that the optical line terminal is resend, in addition to：

The optical network unit distributes information by adjusting electric tunable filter by frequency spectrum work according to the frequency spectrum Target wave band is adjusted to as scope.

With reference to the third any possible implementation into the 7th kind of possible implementation of second aspect, in a kind of the tenth possible implementation, the optical network unit receives the optical line terminal to be included using the login request message of acquiescence downstream bits carrying table transmission：

The optical network unit receives the login request message that the optical line terminal is sent in the initial wavelength or public administration wavelength of all downstream wavelengths or acquiescence using acquiescence downstream bits carrying table；

The optical network unit sends registration reply message using default upstream bit carrying table, including：The optical network unit adjusts light adjustable transmitter, in any upstream wavelength or upstream wavelength corresponding with the downstream wavelength that the reception optical network unit sends login request message, registration reply message is sent using default upstream bit carrying table, the registration reply message includes the sequence number of the optical network unit.

With reference to a kind of possible implementation of second aspect the tenth, in the 12nd kind of possible implementation, the optical network unit is sent to the optical line terminal before the first ranging response message, in addition to：The optical network unit receives the Wavelength Assignment information that the optical line terminal is sent, and the Wavelength Assignment information is that the optical line terminal is what the optical network unit was distributed；

The optical network unit adjusts the wavelength of the optical network unit optical sender and photoreceiver according to the Wavelength Assignment information.

With reference to a kind of possible implementation of second aspect the tenth, in the 13rd kind of possible implementation, the optical network unit is received before the login request message that the optical line terminal is resend, in addition to：

The optical network unit receives the Wavelength Assignment information that the optical line terminal is sent, and the Wavelength Assignment information is that the optical line terminal is what the optical network unit was distributed；

The third aspect provides a kind of optical line terminal, including：

Sending module, for sending descending training sequence to the optical network unit by certification；Receiving module, downstream bits carrying table and up training sequence for receiving the optical network unit that the optical network unit is sent, the downstream bits carrying table of the optical network unit is that the optical network unit is calculated according to the descending training sequence；

Computing module, the upstream bits for calculating the optical network unit according to the up training sequence Carry table；

Update module, the upstream bits carrying meter for the downstream bits carrying table according to the optical network unit and the optical network unit is calculated and updates system descending bit carrying table and system uplink bit carrying table；

The sending module, is additionally operable to send the system descending bit carrying table and the system uplink bit carrying table to the optical network unit, so that the optical network unit updates the system descending bit carrying table and system uplink bit carrying table.

In the third aspect in the first possible implementation, the computing module, the signal to noise ratio specifically for calculating each uplink sub-carrier for receiving the up training sequence according to the up training sequence；The upstream bits of optical network unit carry table according to the signal-to-noise ratio computation for each uplink sub-carrier for receiving the up training sequence.

With reference to the third aspect or the third aspect the first possible implementation, in second of possible implementation, the update module, the less one bit bearing value as the downlink sub-carrier in bit bearing value specifically for the system descending bit to be carried to table downlink sub-carrier identical with the downstream bits carrying table of the optical network unit, to update the system descending bit carrying table；The system uplink bit is carried to the less one bit bearing value as the uplink sub-carrier in the bit bearing value of table uplink sub-carrier identical with the upstream bits carrying table of the optical network unit, to update the system uplink bit carrying table；Or the upstream bits that the upstream bits of the optical network unit carry table and other optical network units are carried table collectively as system uplink bit carrying table by the optical line terminal.

With reference to the third aspect into second of possible implementation of the third aspect any possible implementation, in the third possible implementation, the sending module, be additionally operable to the optical network unit send the second distance measurement request message；

The receiving module, is additionally operable to receive the second ranging response message that the optical network unit is sent, to obtain the second distance measurement result.

With reference to any possible implementation in the third aspect to the third aspect the third possible implementation, in the 4th kind of possible implementation, the sending module, is also used for acquiescence downstream bits carrying table and sends login request message to the optical network unit；

The receiving module, is additionally operable to receive the registration reply message that the optical network unit uses default upstream bit carrying table to send, the registration reply message includes the sequence number of the optical network unit；The optical line terminal also includes：Authentication module, for determining the optical-fiber network that the sequence number is represented The optical network unit that unit has been represented by certification and for the sequence number distributes optical network unit marks；The sending module, is additionally operable to send the optical network unit marks to the optical network unit.With reference to the 4th kind of possible implementation of the third aspect, in the 5th kind of possible implementation, the authentication module, specifically for if it is determined that the optical network unit that represents of the sequence number is configured and be activated, it is determined that the optical network unit that the optical network unit that the sequence number is represented has been represented by certification and for the sequence number distributes the optical network unit marks.

With reference to the 4th kind of possible implementation of the third aspect, in the 6th kind of possible implementation, the authentication module, specifically for if it is determined that the optical network unit that represents of the sequence number is configured but be not activated, then sending authentication request message to the optical network unit；The authentication response message that the optical network unit is sent is received, the authentication response message includes the certification mark and/or certification password of the optical network unit；If it is determined that the certification mark and/or certification password of the sequence number of the optical network unit and the optical network unit are legal, it is determined that the optical network unit that the optical network unit that the sequence number is represented has been represented by certification and for the sequence number distributes the optical network unit marks.

With reference to the 4th kind of possible implementation of the third aspect, in the 7th kind of possible implementation, the authentication module, specifically for if it is determined that the sequence number of the optical network unit is not configured and is not activated, being then that the optical network unit distributes interim optical network unit marks；Authentication request message is sent to the optical network unit；The authentication response message that the optical network unit is sent is received, the authentication response message includes the certification mark and/or certification password of the optical network unit；If it is determined that the certification mark and/or certification password of the sequence number of the optical network unit and the optical network unit are legal, it is determined that the optical network unit passes through certification；Lower line is sent to the optical network unit, and discharges the casual network mark；The login request message is resend to the optical network unit；The registration reply message that the optical network unit is resend is received, and the optical network unit represented for the sequence number distributes the optical network unit marks.

With reference to the 7th kind of possible implementation of the third aspect, in the 8th kind of possible implementation, the sending module is additionally operable to send the 3rd distance measurement request message to the optical network unit；

The receiving module, is additionally operable to receive the 3rd ranging response message that the optical network unit is sent, to obtain the 3rd distance measurement result.

With reference to any possible implementation in the 4th kind to the 8th kind possible implementation of the third aspect, in the 9th kind of possible implementation, the sending module, table is carried to the optical-fiber network list specifically for the spectral range in acquiescence or all downstream spectrum scopes or management passage using acquiescence downstream bits Member sends login request message.

With reference to the 9th kind of possible implementation of the third aspect, in the tenth kind of possible implementation, the optical line terminal also includes：

Frequency spectrum distribute module, for sending frequency spectrum distribution information to the optical network unit, so that spectrum operation scope is adjusted to target wave band by the optical network unit according to frequency spectrum distribution information by the electric tunable filter of regulation.

With reference to any possible implementation in the 4th kind to the 8th kind possible implementation of the third aspect, in a kind of the tenth possible implementation, the sending module, specifically for carrying table to optical network unit transmission login request message using acquiescence downstream bits in the initial wavelength of all downstream wavelengths or acquiescence or public administration wavelength；

The receiving module, use the registration reply message of default upstream bit carrying table transmission after light adjustable transmitter in any upstream wavelength or upstream wavelength corresponding with the downstream wavelength that the reception optical network unit sends login request message by adjusting specifically for receiving the optical network unit, the registration reply message includes the sequence number of the optical network unit.

With reference to a kind of possible implementation of the third aspect the tenth, in the 12nd kind of possible implementation, the optical line terminal also includes：

Wavelength Assignment module, for distributing upstream wavelength and downstream wavelength for the optical network unit；Wavelength Assignment information is sent to the optical network unit, so that the optical network unit adjusts the wavelength of the optical network unit optical sender and photoreceiver according to the Wavelength Assignment information.

Fourth aspect provides a kind of optical network unit, including：

Receiving module, the descending training sequence for receiving optical line terminal transmission；

Computing module, the downstream bits for calculating the optical network unit according to the descending training sequence carry table；

Sending module, downstream bits for sending from the optical network unit to the optical line terminal carry table and up training sequence, so that the optical line terminal is calculated according to the upstream bits carrying meter of the upstream bits carrying table of the up training sequence calculating optical network unit and the downstream bits carrying table according to the optical network unit and the optical network unit and updates system descending bit carrying table and system uplink bit carrying table；

Update module, for receiving and updating the system descending bit carrying table and the system uplink bit carrying table that the optical line terminal is sent. In fourth aspect in the first possible implementation, the computing module, the signal to noise ratio specifically for calculating each downlink sub-carrier for receiving the descending training sequence according to the descending training sequence；The downstream bits of optical network unit carry table according to the signal-to-noise ratio computation for each downlink sub-carrier for receiving the descending training sequence.

With reference to fourth aspect or fourth aspect the first possible implementation, in second of possible implementation, the receiving module is additionally operable to receive the second distance measurement request message that the optical line terminal is sent；

The sending module, is additionally operable to send second of ranging response message to the optical line terminal, so that the optical line terminal obtains the second distance measurement result.

With reference to fourth aspect into second of possible implementation of fourth aspect any possible implementation, in the third possible implementation, the receiving module, is additionally operable to receive the login request message that the optical line terminal is sent using acquiescence downstream bits carrying table；

The sending module, is also used for default upstream bit carrying table and sends registration reply message, the registration reply message includes the sequence number of the optical network unit；

The receiving module, it is additionally operable to receive the optical network unit marks that the optical line terminal is sent, the optical network unit marks are that the optical line terminal determines the optical network unit of the sequence number representative by being that the optical network unit that the sequence number is represented is distributed after certification.

The third possible implementation with reference to fourth aspect, in the 4th kind of possible implementation, the receiving module, specifically for receiving the optical network unit marks that the optical line terminal is sent, it after the optical line terminal determines that optical network unit that the sequence number is represented is configured and is activated is that the optical network unit that the sequence number is represented is distributed that the optical network unit marks, which are,.

The third possible implementation with reference to fourth aspect, in the 5th kind of possible implementation, the receiving module, specifically for receiving the authentication request message that the optical line terminal is sent, the authentication request message is that the optical line terminal determines that optical network unit that the sequence number is represented is configured but is sent to after not being activated；

The sending module, specifically for sending authentication response message to the optical line terminal, the authentication response message includes the certification mark and/or certification password of the optical network unit；

The receiving module, it is additionally operable to receive the optical network unit marks that the optical line terminal is sent, the optical network unit marks are that the optical line terminal determines the sequence number of the optical network unit and the optical network unit that the certification mark of the optical network unit and/or certification password are that the sequence number is represented after legal Distribution.

The third possible implementation with reference to fourth aspect, in the 6th kind of possible implementation, the receiving module, specifically for receiving the authentication request message that the optical line terminal is sent, the authentication request message includes interim optical network unit marks, the authentication request message be the optical line terminal determine the sequence number of the optical network unit do not configure be not activated after be sent to；

The receiving module, is additionally operable to receive the lower line that the optical line terminal is sent, the lower line is the legal rear transmission of certification mark and/or certification password of the sequence number of optical network unit described in the optical line terminal and the optical network unit；Receive the login request message that the optical line terminal is resend；

The sending module, is additionally operable to resend the registration reply message to the optical line terminal；The receiving module, is additionally operable to receive the optical network unit marks that the optical line terminal is sent.With reference to the 6th kind of possible implementation of fourth aspect, in the 7th kind of possible implementation, the receiving module is additionally operable to receive the 3rd distance measurement request message that the optical line terminal is sent；

The sending module, is additionally operable to send the 3rd ranging response message to the optical line terminal, so that the optical line terminal obtains the 3rd distance measurement result.

With reference to the third any possible implementation into the 7th kind of possible implementation of fourth aspect, in the 8th kind of possible implementation, the receiving module, specifically for receiving the login request message that the optical line terminal is sent in the spectral range or all downstream spectrum scopes or management passage of acquiescence using acquiescence downstream bits carrying table.

With reference to the 8th kind of possible implementation of fourth aspect, in the 9th kind of possible implementation, the optical network unit also includes：

Frequency spectrum adjustment module, information is distributed for receiving the frequency spectrum that the optical line terminal is sent；Spectrum operation scope is adjusted to by target wave band by the electric tunable filter of regulation according to frequency spectrum distribution information.

With reference to the third any possible implementation into the 7th kind of possible implementation of fourth aspect, in the tenth kind of possible implementation, the receiving module, specifically for receiving the login request message that the optical line terminal is sent in the initial wavelength or public administration wavelength of all downstream wavelengths or acquiescence using acquiescence downstream bits carrying table；

The sending module, specifically for by adjust after light adjustable transmitter any upstream wavelength or with Receive the optical network unit and send the registration reply message sent in the corresponding upstream wavelength of downstream wavelength of login request message using default upstream bit carrying table, the registration reply message includes the sequence number of the optical network unit.

With reference to the tenth kind of possible implementation of fourth aspect, in a kind of the tenth possible implementation, in addition to：

Wavelength Assignment module, for receiving the Wavelength Assignment information that the optical line terminal is sent, the Wavelength Assignment information is that the optical line terminal is what the optical network unit was distributed；The wavelength of the optical network unit optical sender and photoreceiver is adjusted according to the Wavelength Assignment information.

5th aspect provides a kind of orthogonal frequency division multiplexing passive optical network system, including：

The optical line terminal provided such as any possible implementation of the third aspect；

The optical network unit provided such as any possible implementation of fourth aspect；

Optical Distribution Network.

Orthogonal frequency division multiplexing passive optical network registration activation method provided in an embodiment of the present invention, device and system, OLT sends descending training sequence to the ONU by certification, and receive the ONU of ONU transmissions downstream bits carrying table and up training sequence, so as to calculate the upstream bits carrying table of the ONU, system descending bit carrying table and system uplink bit carrying table are updated using the downstream bits carrying table and upstream bits carrying table of the ONU and are sent to ONU, OLT and ONU can be made to use the system descending bit carrying table after updating and system uplink bit carrying table transmission data, so that OFDM-PON link capacity is maximized.Brief description of the drawings

In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, the required accompanying drawing used in embodiment or description of the prior art will be briefly described below, apparently, drawings in the following description are some embodiments of the present invention, for those of ordinary skill in the art, without having to pay creative labor, other accompanying drawings can also be obtained according to these accompanying drawings.

Fig. 1 is typical Single wavelength OFDM-PON configuration diagrams；

Fig. 2 is the OFDM-PON configuration diagrams based on Nyquist multiplexing technologies；

Fig. 3 is the flow chart of OFDM-PON registration activation methods embodiment one provided in an embodiment of the present invention；

Fig. 4 is the flow of OFDM-PON registration activation methods embodiment two provided in an embodiment of the present invention Figure；

Fig. 5 is the present invention;The flow chart of the OFDM-PON registration activating methods embodiment three of example offer is provided；

Fig. 6 is the present invention;The OFDM-PON for applying example offer registers the flow chart of activating method example IV；

Fig. 7 is the present invention;The flow chart of the OFDM-PON registration activating methods embodiment five of example offer is provided；

Fig. 8 is the present invention;The flow chart of the OFDM-PON registration activating methods embodiment six of example offer is provided；

Fig. 9 is the present invention;The flow chart of the OFDM-PON registration activating methods embodiment seven of example offer is provided；

Figure 10 applies the flow chart for the OFDM-PON registration activating methods embodiment eight that example is provided for the present invention；

Figure 11 applies the flow chart for the OFDM-PON registration activating methods embodiment nine that example is provided for the present invention；

Figure 12 applies the flow chart for the OFDM-PON registration activating methods embodiment ten that example is provided for the present invention；

Figure 13 applies the signaling process figure for the OFDM-PON registration activating method embodiments ^ mono- that example is provided for the present invention；

Figure 14 applies the signaling process figure for the OFDM-PON registration activating methods embodiment 12 that example is provided for the present invention；

Figure 15 applies the signaling process figure for the OFDM-PON registration activating methods embodiment 13 that example is provided for the present invention；

Figure 16 applies the signaling process figure for the OFDM-PON registration activating methods embodiment 14 that example is provided for the present invention；

Figure 17 applies the signaling process figure for the OFDM-PON registration activating methods embodiment 15 that example is provided for the present invention；

Figure 18 applies the signaling process figure for the OFDM-PON registration activating methods embodiment 16 that example is provided for the present invention；

Figure 19 applies the letter for the OFDM-PON registration activating methods embodiment 17 that example is provided for the present invention Make flow chart；

Figure 20 makes flow chart for OFDM-PON registration activation methods embodiment 18 provided in an embodiment of the present invention；

Figure 21 makes flow chart for OFDM-PON registration activation methods embodiment 19 provided in an embodiment of the present invention；

Figure 22 is the structural representation of optical line terminal embodiment one provided in an embodiment of the present invention；Figure 23 is the structural representation of optical line terminal embodiment two provided in an embodiment of the present invention；Figure 24 is the structural representation of optical line terminal embodiment three provided in an embodiment of the present invention；Figure 25 is the structural representation of optical line terminal example IV provided in an embodiment of the present invention；Figure 26 is the structural representation of optical network unit embodiment one provided in an embodiment of the present invention；Figure 27 is the structural representation of optical network unit embodiment two provided in an embodiment of the present invention；Figure 28 is the structural representation of optical network unit embodiment three provided in an embodiment of the present invention；Figure 29 is the structural representation of OFDM-PON system embodiments one provided in an embodiment of the present invention.Embodiment is to make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is a part of embodiment of the invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made belongs to the scope of protection of the invention.

In PON system, OLT provides Network Side Interface for PON system, connects one or more ODNo ONU and provides user side interface for PON system, is connected with ODN.If ONU directly provides User Port Function, such as PC（Personal Computer, PC) online ethernet user port, then referred to as ONT.The ONU systems being mentioned below in the present invention refer to ONU and ONT.ODN is passive optical splitters part, for connecting OLT device and ONU equipment, for distributing or being multiplexed the data-signal between OLT and ONU.In OFDM-PON systems, down direction is referred to as from OLT to ONU；Conversely, being up direction from ONU to OLT.

Fig. 1 is typical Single wavelength OFDM-PON configuration diagrams, as shown in figure 1, in Single wavelength OFDM-PON systems, uplink and downlink direction respectively only has 1 wavelength.In down direction, OLT110 medium access control (Medium Access Control, MAC) layer 111 be used to realizing ONU management, Dynamic Bandwidth Allocation（Dynamic Bandwidth Allocation, DBA), ONU registrations activation, the function such as data transmit-receive；Physical medium is related（Physical Medium Dependent, PMD) layer 112 be used for according to MAC layer 111 configure parameter modulate data onto the Modulation and Amplitude Modulation that is orthogonal（Quadrature Amplitude Modulation, QAM) form and through inverse fast fourier transform（Inverse Fast Fourier Transformation, IFFT) conversion after, electric signal is converted digital signals into by digital-to-analogue conversion (Digital to Analog Converter, DAC) 113；Optical sender（Optical Transmitter, Tx) 114 be used for convert the electrical signal to optical signal；Optical signal is delivered to ONU130 through optical fiber and passive device, such as optical splitter 120 (optical fiber and passive device composition ODN);ONU130 photoreceiver（Optical Receiver, Rx) 131 electric signal is converted optical signals into, by analog-to-digital conversion（Analog to Digital Converter, ADC) 132 analog electrical signal is converted into data signal, synchronization, Fast Fourier Transform (FFT) are realized by pmd layer 133（Fast Fourier Transformation, FFT), balanced and QAM demodulation, give MAC layer 134 by the data recovered and handle.In up direction, ONU130 MAC layers 134 are used to realize that ONU is managed, and the function such as DBA, data transmit-receive sends data in the DBA times specified；Pmd layer 133, DAC135, Txl36 function are similar with the function of corresponding module in down direction OLT110 in ONU130, and Rxll6, ADC115, the function of pmd layer 112 are similar with the function of corresponding module in down direction ONU130 in OLT110.Wavelength division multiplexer in OLT110（Wavelength Division Multiplexing, WDM) WDM137 in 117 and ONU130 is used to enable different optical signals to transmit in optical fiber all the way.In addition, also there are multiple ONU equipments such as ONU140, ONU150 in system, its concrete structure and function are identical with OUN130.

Fig. 2 is the OFDM-PON configuration diagrams based on Nyquist multiplexing technologies, as shown in Fig. 2 in based on Nyquist multiplexing technology OFDM-PON systems, uplink and downlink direction respectively only has 1 wavelength.From unlike Single wavelength OFDM-PON systems, there are two DAC in the uplink and downlink direction based on Nyquist multiplexing technologies respectively, and baseband mode and mixed mode are operated in respectively.DAC in a hybrid mode, radio frequency is exported in second order or three rank Nyquist areas（Radio Frequency, RF) carrier wave.In down direction, OLT210 MAC layer 211 is used to realize the functions such as ONU management, DBA, ONU registration activation, data transmit-receive；Pmd layer 212 is used for after modulating data onto into QAM forms according to the parameter that MAC layer 211 is configured and changed through IFFT, and electric signal is converted digital signals into by DAC213 and DAC214；Wherein, DAC213 is operated in baseband mode, and data are transformed on the carrier wave of base band；DAC214 work mixed modes, data are transformed on the carrier wave of radio frequency；I.e. by DAC213 and DAC214 conversion after data be in different spectral range or wave band, DAC213 and DAC214 conversion after data After the merging of electrical multiplexer 215, optical signal is converted the electrical signal to by Tx216；Optical signal is delivered to ONU230 through optical fiber and passive device, such as optical splitter 220 (optical fiber and passive device composition ODN);ONU230 Rx231 is converted optical signals into after electric signal, by electric tunable filter（Tunable Filter, TF) the 232 suitable wave band of selection, then analog electrical signal is converted into data signal by ADC233, realizes that synchronization, FFT, equilibrium and QAM are demodulated by pmd layer 234, give MAC layer 235 by the data recovered and handle.In up direction, ONU230 MAC layer 235 is used to realize that ONU is managed, and the function such as DBA, data transmit-receive sends data in the DBA times specified；Pmd layer 234, DAC layers 236, Tx237 function are similar with pmd layer 133 in the ONU130 in Fig. 1, DAC135, Txl36 function in ONU230, and Rx217, ADC218, the function of pmd layer 212 are similar with the function of Rxll6 in the OLT110 in Fig. 1, ADC115, pmd layer 112 in OLT210.The WDM238 in WDM219 and ONU230 in OLT210 is used to enable different optical signals to transmit in optical fiber all the way.In addition, also there are multiple ONU equipment such as ONU240, ONU250 in system, its concrete structure and function are identical with OUN230.

In addition, the multi-wavelength OFDM-PON systems based on WDM technology, compared with Single wavelength OFDM-PON systems, difference is that respectively there is the optical signal of 4 kinds of different wave lengths in downlink and uplink direction.ONU optical sender is usually tunable laser, and ONU photoreceiver is usually comprising tunable filter, that is to say, that ONU optical sender and photoreceiver can select suitable operation wavelength.

For above-mentioned several OFDM-PON systems, ofdm signal is to transmit data by multiple subcarriers, and the maximum number bits that single sub-carrier can be carried are referred to as bit bearing value（Bitloading, or B values）, the mapping table of each subcarrier and its bit bearing value is referred to as bit carrying table（Bit table, or B tables）.Simultaneously, in OFDM-PON, transmission range is different between OLT and different ONU, the signal to noise ratio of link is also different between different ONU and OLT, each ONU bit carrying table may also be different, therefore minimum in bit bearing value of the bit bearing value of each subcarrier in downstream bits carrying table for same sub-carrier in each ONU bit carrying table one is made, just can ensure that can ensure normal data transfer between OLT and every ONU.The bit carrying table in uplink and downlink direction in OLT is referred to as system uplink bit carrying table and system descending bit carrying table.Manage and safeguard that the system uplink bit carrying table in OLT and system descending bit carrying table can improve the utilization rate of link capacity of OFDM-PON systems.

Fig. 3 is the flow chart of OFDM-PON registration activation methods embodiment one provided in an embodiment of the present invention, as shown in figure 3, the method for the present embodiment includes： Step S301, optical line terminal sends descending training sequence to the optical network unit by certification.Specifically, a kind of OFDM-PON registration activation methods are present embodiments provided, when the ONU in OFDM-PON systems needs to add network, it is necessary first to the certification registered on OLT and pass through OLT.After OLT determines to exist in network registered and ONU by certification, descending training sequence is sent to the ONU, the descending training sequence is sent by the downlink sub-carrier between OLT and ONU, the different bits in each downlink sub-carrier bearing downlink training sequence.

Because OLT does not obtain ONU downstream bits carrying table also, therefore OLT sends descending training sequence to ONU can use the downstream bits carrying table of acquiescence, the bit bearing value of each downlink sub-carrier is typically small in the downstream bits carrying table of acquiescence, all ONU is received the descending training sequence.

Step S302, optical line terminal receives the downstream bits carrying table and up training sequence for the optical network unit that optical network unit is sent, and the downstream bits carrying table of optical network unit is what optical network unit was calculated according to descending training sequence.

Specifically, OLT is sent after descending training sequence to ONU, ONU can calculate the downstream bits carrying table of the ONU according to the descending training sequence, and the downstream bits carrying table of the ONU reflects the optimum bit bearing value of the ONU and OLT all downlink sub-carriers.OLT receives the downstream bits carrying table that ONU is sent, meanwhile, OLT also receives the up training sequence of ONU transmissions.

It should be noted that, OLT is preset in OLT and ONU to the ONU descending training sequences sent and the OLT up training sequence for receiving ONU transmissions, the descending training sequence and up training sequence can be identical sequence or different sequences.

Step S303, the upstream bits that optical line terminal calculates optical network unit according to up training sequence carry table.

Specifically, OLT is received after the up training sequence of ONU transmissions, because the up training sequence is that ONU is sent by uplink sub-carrier, each uplink sub-carrier carries the different bits in up training sequence, and OLT can calculate the upstream bits carrying table of the ONU according to the up training sequence received.

Step S304, optical line terminal is calculated according to the downstream bits carrying table of optical network unit and the upstream bits carrying meter of optical network unit and updates system descending bit carrying table and system uplink bit carrying table.

Specifically, because OFDM-PON is a kind of system of point-to-multipoint, an OLT may be connected with multiple ONU and transmit data, and send the ratio of data to different ONU by identical subcarrier Special bearing value may be different, in order to ensure every ONU for being connected with OLT can normal transceiving data, and in order that the link transmission capacity between OLT and ONU is maximum, preserve in the olt and maintenance system downstream bits carrying table and system uplink bit carrying table.System descending bit carrying table represents bit bearing value of all downlink sub-carriers of the OLT when sending data, be all ONU ONU downstream bits carrying tables in same sub-carrier bit bearing value in minimum value, it is ensured that every ONU can receive OLT transmission data.System uplink bit carrying table represents bit bearing value of all ONU all uplink sub-carriers when sending data, be all ONU ONU upstream bits carrying tables in same sub-carrier bit bearing value in minimum value, it is ensured that OLT is received the data that all ONU are sent.After OLT receives the downstream bits carrying table of ONU transmissions and calculates upstream bits carrying table, system descending bit carrying table and system uplink bit carrying table are updated according to the downstream bits carrying table of the ONU and upstream bits carrying table respectively.It is to make all ONU of the OLT connections to use to transmit data between the system descending bit carrying table and system uplink bit carrying table and OLT that OLT, which updates system descending bit carrying table and the purpose of system uplink bit carrying table,.

Step S305, optical line terminal sends system descending bit to optical network unit and carries table and system uplink bit carrying table, so that optical network unit updates system descending bit carrying table and system uplink bit carrying table.

Specifically, OLT has been updated after system descending bit carrying table and system uplink bit carrying table, need to send the system descending bit carrying table after renewal and system uplink bit carrying table to ONU, ONU is set also to preserve the renewal system descending bit carrying table and system uplink bit carrying table, so that ONU can also be used transmits data between the system descending bit carrying table and information and OLT in system uplink bit carrying table.So, OLT and ONU can use the system descending bit carrying table after updating and system uplink bit carrying table transmission data, because the system descending bit carrying table after renewal and system uplink bit carrying table represent the optimum bit bearing value of OLT all subcarriers, therefore OLT and ONU can maximize OFDM-PON link capacity using the system descending bit carrying table after renewal and system uplink bit carrying table transmission data.

The present embodiment, OLT sends descending training sequence to the ONU by certification, and receive the ONU of ONU transmissions downstream bits carrying table and up training sequence, so as to calculate the upstream bits carrying table of the ONU, system descending bit carrying table and system uplink bit carrying table are updated using the downstream bits carrying table and upstream bits carrying table of the ONU and are sent to ONU, OLT and ONU can be made to transmit data using the system descending bit carrying table and system uplink bit carrying table after updating, from And maximize OFDM-PON link capacity.

It should be noted that in OFDM-PON systems, between OLT and ONU normal transmission data,

OLT needs the distance between measurement and ONU, the present embodiment will be updated and the process of maintenance system downstream bits carrying table and system uplink bit carrying table is attached in ranging process, without carrying table and the new signaling process of system uplink bit carrying table distribution with maintenance system downstream bits to update, so as to save system resource.When the ONU in OFDM-PON systems needs to add network, it is necessary first to the certification registered on OLT and pass through OLT.After OLT determines to exist in network registered and ONU by certification, the first distance measurement request message is sent to the ONU, descending training sequence is also sent while the first distance measurement request message is sent.OLT is sent after the first distance measurement request message to ONU, ONU can calculate the downstream bits carrying table of the ONU according to the descending training sequence in the first distance measurement request message, and the downstream bits carrying table of the ONU reflects the optimum bit bearing value of the ONU and OLT all downlink sub-carriers.Then, OLT can receive the first ranging response message of ONU transmissions, OLT is obtained the first distance measurement result, while also receiving ONU downstream bits carrying table and up training sequence.Further OLT can complete to calculate and update the process of system uplink carrying table and system descending carrying table.

In the flow that OLT and OUN carries out ranging, the flow for calculating and updating system descending bit carrying table and system uplink bit carrying table is added into, makes OFDM-PON link capacity maximized simultaneously, has further saved system resource.

Further, in embodiment illustrated in fig. 3, the upstream bits that optical line terminal calculates optical network unit according to up training sequence carry table, including：Optical line terminal calculates the signal to noise ratio for each uplink sub-carrier for receiving up training sequence according to up training sequence；Optical line terminal carries table according to the upstream bits of the signal-to-noise ratio computation optical network unit for each uplink sub-carrier for receiving up training sequence.

Specifically, OLT according to up training sequence calculate send the up training sequence ONU upstream bits carry table can according to receive the up training sequence each uplink sub-carrier signal to noise ratio（Signal Noise Ratio, SNR) calculated.OLT is when receiving the up training sequence that ONU is sent by each uplink sub-carrier, the SNR of each uplink sub-carrier can be obtained, the bit bearing value that each uplink sub-carrier can be carried, the upstream bits bearing value of as each uplink sub-carrier can be calculated according to the SNR of each uplink sub-carrier.OLT brings together the upstream bits bearing value of each uplink sub-carrier in the upstream bits carrying table as the ONU.

Further, in embodiment illustrated in fig. 3, optical line terminal is according to the downstream bits of optical network unit The upstream bits carrying meter of carrying table and optical network unit is calculated and updates system descending bit carrying table and system uplink bit carrying table, including：The less one bit bearing value as the downlink sub-carrier in the bit bearing value of optical line terminal downlink sub-carrier that the downstream bits carrying table of downstream bits carrying table and the optical network unit is identical, to update system descending bit carrying table；The less one bit bearing value as the uplink sub-carrier in the bit bearing value of optical line terminal uplink sub-carrier that the upstream bits carrying table of system uplink bit carrying table and optical network unit is identical, to update system uplink bit carrying table；Or the upstream bits that the upstream bits of optical network unit carry table and other optical network units are carried table collectively as system uplink bit carrying table by optical line terminal.The calculating update method of system uplink carrying bit table is divided into two kinds, wherein in first method, the less one bit bearing value as the uplink sub-carrier in the bit bearing value of optical line terminal uplink sub-carrier that the upstream bits carrying table of system uplink bit carrying table and optical network unit is identical, then the system uplink carrying table after renewal can be used to send upstream data by all optical network units in system；In second method, the upstream bits that the upstream bits of optical network unit carry table and other optical network units are carried table collectively as system uplink bit carrying table by optical line terminal, so each optical network unit still sends upstream data using respective upstream bits carrying table, and optical line terminal then switches the upstream bits carrying table of different optical network units to receive the upstream data that different optical network units are sent according to BWMAP information.In above-mentioned first method, bandwidth usage performance is more compromised, but complexity is relatively low；And in second method, bandwidth usage performance highest, but complexity is higher.

Fig. 4 is the flow chart of OFDM-PON registration activation methods embodiment two provided in an embodiment of the present invention, as shown in figure 4, the method for the present embodiment includes：

Step S401, optical line terminal sends the first distance measurement request message and descending training sequence to the optical network unit by certification.

Step S402, optical line terminal receives the first ranging response message and the downstream bits carrying table of optical network unit and up training sequence that optical network unit is sent, to obtain the first distance measurement result.

Step S403, the upstream bits that optical line terminal calculates optical network unit according to up training sequence carry table.

Step S404, optical line terminal is calculated according to the downstream bits carrying table of optical network unit and the upstream bits carrying meter of optical network unit and updates system descending bit carrying table and system uplink bit carrying table.

Step S405, optical line terminal sends system descending bit to optical network unit and carries table and system uplink bit carrying table, so that optical network unit updates system descending bit carrying table and system uplink bit is held Carry table.

Step S406, optical line terminal sends the second distance measurement request message to optical network unit.

Specifically, when sending the first distance measurement request message to ONU in step S501 due to OLT, OLT does not obtain the downstream bits carrying table of the ONU also, and ONU does not obtain the upstream bits carrying table of the ONU yet during OLT the first ranging response messages of reception.Therefore when OLT obtains the first distance measurement result, OLT and ONU do not know the bit bearing value of mutual uplink and downlink subcarrier, so the first distance measurement result is not necessarily accurate.Therefore after OLT and ONU have updated system descending bit carrying table and system uplink bit carrying table, OLT sends the second distance measurement request message to ONU, carries out the second ranging flow.

Step S407, optical line terminal receives the second ranging response message that optical network unit is sent, to obtain the second distance measurement result.

Specifically, OLT receives the second ranging response message that ONU is sent, so as to obtain the second distance measurement result.The second distance measurement result that OLT is obtained is obtained after it have updated system descending bit carrying table and system uplink bit carrying table, therefore the second distance measurement result is more accurate than the first distance measurement result, and OLT transmits the performance of data more preferably using the second distance measurement result with ONU.

The present embodiment, in the flow that OLT and OUN carries out ranging, it is added into the flow for calculating and updating system descending bit carrying table and system uplink bit carrying table, and after it have updated system descending bit carrying table and system uplink bit carrying table, carry out the second ranging flow, make OFDM-PON link capacity maximized simultaneously, further saved system resource, while improving systematic function.

Fig. 5 is the flow chart of OFDM-PON registration activation methods embodiment three provided in an embodiment of the present invention, and the present embodiment is the process that ONU is registered in the olt, as shown in figure 5, the method for the present embodiment includes：

Step S501, optical line terminal carries table to optical network unit transmission login request message using acquiescence downstream bits.

Specifically, when OLT determines the ONU of registration in need in network, login request message is sent to the ONU, because the ONU is unregistered, OLT does not know the bit carrying table of the ONU, it is impossible to ensure that OLT and ONU are communicated by OLT bit carrying table.So OLT carries table to ONU transmission login request messages using acquiescence downstream bits.Give tacit consent to downstream bits carrying table and default upstream bit carrying table all uses relatively low bit bearing value on each subcarrier, to ensure that all ONU can be with OLT proper communications in network as defined in standard. Step S502, optical line terminal receives optical network unit and carries the registration reply message that table is sent using default upstream bit, and registration reply message includes the sequence number of optical network unit.

Specifically, carry table also without the downstream bits after renewal in unregistered ONU and upstream bits carry table, therefore, OLT receives the registration reply message that ONU uses default upstream bit carrying table to send.Each ONU has a unique sequence number（Serial Number, SN), for making OLT distinguish each ONU, the registration reply message that OLT is received includes the sequence number of the ONU.

Step S503, optical line terminal determines that the optical network unit that the optical network unit that the sequence number is represented has been represented by certification and for the sequence number distributes optical network unit marks.

Specifically, OLT is received after the sequence number of ONU transmissions, judges whether the ONU that the sequence number is represented is configured in the olt according to the sequence number.If the OLT determines that the ONU that the sequence number is represented is configured, optical network unit marks are distributed for the ONU that the sequence number is represented（Optical Network Unit Identifier, ONU-ID) .ONU-ID is the network identity that OLT is ONU distribution.

The first authentication method：After OLT receives the sequence number of ONU transmissions, after determining that the sequence number of the ONU is configured in the olt, in addition it is also necessary to determine whether the ONU has been activated.If OLT determines that the ONU is configured and is activated, OLT determine the sequence number represent ONU by certification and for the ONU distribute ONU-ID, otherwise do not distribute ONU-ID.

Second of authentication method：OTL first sends authentication request message to ONU；Then OLT receives the authentication response message that ONU is sent, and the authentication response message includes ONU certification mark (RegistrationJD) and/or certification password (password)；If OLT determines that ONU sequence number and ONU certification mark and/or certification password are legal, OLT determines that the ONU that the ONU that the sequence number is represented has been represented by certification and for the sequence number distributes optical network unit marks.If OLT determines that ONU sequence number and ONU certification mark and/or certification password are illegal, refusal ONU is by certification, and register flow path terminates.

The third authentication method：After OLT receives the sequence number of ONU transmissions, first interim ONU-ID is distributed for the ONU;Then OLT sends authentication request message to ONU；Then OLT receives the authentication response message that ONU is sent, and the authentication response message includes ONU certification mark and/or certification password；If OLT determines that ONU sequence number and ONU certification mark and/or certification password are legal, OLT determines ONU by certification；Following OLT sends lower line to ONU, and discharges interim ONU-ID;Then OLT resends login request message to ONU；Last OLT receives the registration reply message that ONU is resend, and the registration reply message resend includes ONU's Sequence number, and the ONU represented for the sequence number distributes formal ONU-ID.

Step S504, optical line terminal sends the optical network unit marks to optical network unit.

Specifically, OLT needs that the ONU will be sent to for the OUN-ID that ONU is distributed.

The present embodiment is the process that ONU is registered in the olt, is registered in the olt in ONU and by certification, OLT could start to calculate and update the process of system descending bit carrying table and system uplink bit carrying table.

Fig. 2 is into embodiment illustrated in fig. 5, only account for the situation of the OFDM-PON systems of Single wavelength, for the OFDM-PON systems based on Nyquist multiplexing technologies and the multi-wavelength OFDM-PON systems based on WDM technology, its registration activation method difference.

Fig. 6 is the flow chart of OFDM-PON registration activation methods example IV provided in an embodiment of the present invention, and the present embodiment is the registration activation method of the OFDM-PON systems based on Nyquist multiplexing technologies, as shown in fig. 6, the method for the present embodiment includes：

Step S601, optical line terminal uses acquiescence downstream bits to carry table to optical network unit transmission login request message in the spectral range or all downstream spectrum scopes or management passage of acquiescence.

Step S602, optical line terminal receives optical network unit and carries the registration reply message that table is sent using default upstream bit, and the registration reply message includes the sequence number of optical network unit.

Step S603, optical line terminal determines that the optical network unit that the optical network unit that the sequence number is represented has been represented by certification and for the sequence number distributes optical network unit marks.

Step S604, optical line terminal sends the optical network unit marks to optical network unit.

Step S605, optical line terminal sends the first distance measurement request message and descending training sequence to the optical network unit by certification.

Step S606, optical line terminal sends frequency spectrum distribution information to optical network unit, so that spectrum operation scope is adjusted to target wave band by optical network unit according to frequency spectrum distribution information by the electric tunable filter of regulation.

Step S607, optical line terminal receives the first ranging response message and the downstream bits carrying table of optical network unit and up training sequence that optical network unit is sent, to obtain the first distance measurement result.

Step S608, the upstream bits that optical line terminal calculates optical network unit according to up training sequence carry table.

Step S609, optical line terminal is calculated according to the downstream bits carrying table of optical network unit and the upstream bits carrying meter of optical network unit and updates downstream bits carrying table and upstream bits carrying table. Step S610, optical line terminal sends downstream bits carrying table to optical network unit and upstream bits carry table, so that optical network unit updates downstream bits carrying table and upstream bits carrying table.

Step S611, optical line terminal sends the second distance measurement request message to optical network unit.

Step S612, optical line terminal receives the second ranging response message that optical network unit is sent, to obtain the second distance measurement result.

The specific method of the present embodiment is similar with the OFDM-PON system embodiments of Single wavelength, and here is omitted.

In addition, in embodiment illustrated in fig. 6, after step S606 is the sequence number that OLT receives ONU transmissions, determine what is carried out after ONU that the sequence number represents is configured in the olt.If OLT is received after the sequence number of ONU transmissions, determine that the ONU of sequence number representative is not configured in the olt not being activated, there is no step S606 then, but it is similar with step S503 in embodiment illustrated in fig. 5, before optical line terminal resends login request message to optical network unit, in addition to：Optical line terminal sends frequency spectrum distribution information to optical network unit, so that spectrum operation scope is adjusted to target wave band by the optical network unit according to frequency spectrum distribution information by the electric tunable filter of regulation.

Fig. 7 is the flow chart of OFDM-PON registration activation methods embodiment five provided in an embodiment of the present invention, and the present embodiment is the registration activation method of the multi-wavelength OFDM-PON systems based on WDM technology, as shown in fig. 7, the method for the present embodiment includes：

Step S701, optical line terminal carries table to optical network unit transmission login request message in the initial wavelength or public administration wavelength of all downstream wavelengths or acquiescence using acquiescence downstream bits.

Step S702, optical line terminal receives optical network unit includes the sequence number of optical network unit by adjusting the registration reply message sent after light adjustable transmitter in any upstream wavelength or upstream wavelength corresponding with the downstream wavelength that reception optical network unit sends login request message using default upstream bit carrying table, the registration reply message.

Specifically, when the up-downgoing wavelength of OFDM-PON systems is unbound, optical line terminal receives optical network unit by adjusting the registration reply message sent after light adjustable transmitter in any upstream wavelength using default upstream bit carrying table；When the up-downgoing wavelength binding of OFDM-PON systems, optical line terminal receives optical network unit by adjusting the registration reply message sent after light adjustable transmitter in upstream wavelength corresponding with the downstream wavelength of reception optical network unit transmission login request message using default upstream bit carrying table.

Step S703, optical line terminal determines that the optical network unit that the sequence number is represented by certification and has been The optical network unit distribution optical network unit marks that the sequence number is represented.

Step S704, optical line terminal sends the optical network unit marks to optical network unit.

Step S705, optical line terminal sends the first distance measurement request message and descending training sequence to the optical network unit by certification.

Step S706, optical line terminal is that optical network unit distributes upstream wavelength and downstream wavelength.

Step S707, optical line terminal sends Wavelength Assignment information to optical network unit, so that optical network unit adjusts the wavelength of optical network unit optical sender and photoreceiver according to Wavelength Assignment information.

Step S708, optical line terminal receives the first ranging response message and downstream bits carrying table and up training sequence that optical network unit is sent, to obtain the first distance measurement result.

Step S709, the upstream bits that optical line terminal calculates optical network unit according to up training sequence carry table.

Step S710, optical line terminal is calculated according to the downstream bits carrying table of optical network unit and the upstream bits carrying meter of optical network unit and updates downstream bits carrying table and upstream bits carrying table.

Step S711, optical line terminal sends downstream bits carrying table to optical network unit and upstream bits carry table, so that optical network unit updates downstream bits carrying table and upstream bits carrying table.

Step S712, optical line terminal sends the second distance measurement request message to optical network unit.

Step S713, optical line terminal receives the second ranging response message that optical network unit is sent, to obtain the second distance measurement result.

In addition, in embodiment illustrated in fig. 7, after step S706 and step S707 are the sequence number that OLT receives ONU transmissions, determine what is carried out after ONU that the sequence number represents is configured in the olt.If OLT is received after the sequence number of ONU transmissions, determine that the ONU of sequence number representative is not configured in the olt not being activated, then without step S706 and step S707, but it is similar with step S503 in embodiment illustrated in fig. 5, before OLT resends login request message to ONU, in addition to：Optical line terminal is that optical network unit distributes upstream wavelength and downstream wavelength；Optical line terminal sends Wavelength Assignment information to optical network unit, so that optical network unit adjusts the wavelength of optical network unit optical sender and photoreceiver according to the Wavelength Assignment information.

Fig. 8 is the flow chart of OFDM-PON registration activation methods embodiment six provided in an embodiment of the present invention, as shown in figure 8, the method for the present embodiment includes： Step S801, receives the descending training sequence that optical line terminal is sent by the optical network unit of certification.

Specifically, a kind of OFDM-PON registration activation methods are present embodiments provided, when the ONU in OFDM-PON systems needs to add network, it is necessary first to the certification registered on OLT and pass through OLT.After OLT determines to exist in network registered and ONU by certification, ONU receives the descending training sequence that OLT is sent, the descending training sequence is sent by the downlink sub-carrier between OLT and ONU, the different bits in each downlink sub-carrier bearing downlink training sequence.

Because ONU does not obtain system descending bit carrying table also, therefore OLT sends descending training sequence to ONU can use the downstream bits carrying table of acquiescence, the bit bearing value of each downlink sub-carrier is typically small in the downstream bits carrying table of acquiescence, all ONU is received the descending training sequence.

Step S802, the downstream bits that optical network unit calculates optical network unit according to descending training sequence carry table.

Specifically, ONU is received after the descending training sequence of OLT transmissions, because the descending training sequence is that OLT is sent by downlink sub-carrier, therefore the descending training sequence that the OLT that ONU is received is sent by different sub-carrier there may be difference, and ONU can calculate the downstream bits carrying table of the ONU according to the descending training sequence received.

Step S803, the downstream bits that optical network unit sends optical network unit to optical line terminal carry table and up training sequence, so that optical line terminal is calculated according to the upstream bits carrying meter of the upstream bits carrying table of up training sequence calculating optical network unit and the downstream bits carrying table according to optical network unit and optical network unit and updates system descending bit carrying table and system uplink bit carrying table.

Specifically, ONU sends the downstream bits after calculating to OLT and carries table and up training sequence, because OFDM-PON is a kind of system of point-to-multipoint, one OLT may be connected with multiple ONU and transmit data, and may be different to the different ONU bit bearing values for sending data by identical subcarrier, in order to ensure every ONU for being connected with OLT can normal transceiving data, and in order that the link transmission capacity between OLT and ONU is maximum, preserve in the olt and maintenance system downstream bits carrying table and system uplink bit carrying table.System descending bit carrying table represents bit bearing value of all downlink sub-carriers of the OLT when sending data, be all ONU ONU downstream bits carrying tables in same sub-carrier bit bearing value in minimum value, it is ensured that every ONU can receive OLT transmission data.System uplink bit carrying table represents that all ONU all uplink sub-carriers are sending number According to when bit bearing value, be all ONU ONU upstream bits carrying tables in same sub-carrier bit bearing value in minimum value, it is ensured that OLT is received the data that all ONU are sent.After OLT receives the downstream bits carrying table of ONU transmissions and calculates upstream bits carrying table, system descending bit carrying table and system uplink bit carrying table are updated according to the downstream bits carrying table of the ONU and upstream bits carrying table respectively.It is to make all ONU of the OLT connections to use to transmit data between the system descending bit carrying table and system uplink bit carrying table and OLT that OLT, which updates system descending bit carrying table and the purpose of system uplink bit carrying table,.

Step S804, optical network unit receives and updates the system descending bit carrying table and system uplink bit carrying table of optical line terminal transmission.

Specifically, OLT has been updated after system descending bit carrying table and system uplink bit carrying table,

ONU receives system descending bit carrying table and system uplink bit carrying table after the renewal that OLT is sent and sent to ONU, ONU is set also to preserve the renewal system descending bit carrying table and system uplink bit carrying table, so that ONU can also be used transmits data between the system descending bit carrying table and information and OLT in system uplink bit carrying table.So, OLT and ONU can use the system descending bit carrying table after updating and system uplink bit carrying table transmission data, because the system descending bit carrying table after renewal and system uplink bit carrying table represent the optimum bit bearing value of OLT all subcarriers, therefore OLT and ONU can maximize OFDM-PON link capacity using the system descending bit carrying table after renewal and system uplink bit carrying table transmission data.

The present embodiment, OLT sends descending training sequence to the ONU by certification, and receive the ONU of ONU transmissions downstream bits carrying table and up training sequence, so as to calculate the upstream bits carrying table of the ONU, system descending bit carrying table and system uplink bit carrying table are updated using the downstream bits carrying table and upstream bits carrying table of the ONU and are sent to ONU, OLT and ONU can be made to use the system descending bit carrying table after updating and system uplink bit carrying table transmission data, so that OFDM-PON link capacity is maximized.

OLT needs the distance between measurement and ONU, the present embodiment will be updated and the process of maintenance system downstream bits carrying table and system uplink bit carrying table is attached in ranging process, without carrying table and the new signaling process of system uplink bit carrying table distribution with maintenance system downstream bits to update, so as to save system resource.When the ONU in OFDM-PON systems needs to add network, it is necessary first to the certification registered on OLT and pass through OLT.When OLT determines to exist registered in network and passes through After the ONU of certification, the ONU receives the first distance measurement request message that OLT is sent, and 0NU also receives descending training sequence while the first distance measurement request message is received.0NU is received after the first distance measurement request message that 0LT is sent, 0NU can calculate the downstream bits carrying table of the 0NU according to the descending training sequence in the first distance measurement request message, and the downstream bits carrying table of the 0NU reflects the bit bearing value of the 0NU and 0LT all downlink sub-carriers.Then, ONU can send the first ranging response message to OLT, 0LT is obtained the first distance measurement result, while 0NU also sends the downstream bits carrying table and up training sequence of the 0NU to 0LT.Further 0LT can complete to calculate and update the process of system uplink carrying table and system descending carrying table.

Further, in embodiment illustrated in fig. 8, the downstream bits that optical network unit calculates optical network unit according to descending training sequence carry table, including：Optical network unit calculates the signal to noise ratio for each downlink sub-carrier for receiving descending training sequence according to descending training sequence；Optical network unit carries table according to the downstream bits of the signal-to-noise ratio computation optical network unit for each downlink sub-carrier for receiving descending training sequence.

Specifically, the downstream bits carrying table that ONU calculates the ONU according to descending training sequence can be calculated according to the SNR for each downlink sub-carrier for receiving the descending training sequence.ONU is when receiving the descending training sequence that OLT is sent by each downlink sub-carrier, the SNR of each downlink sub-carrier can be obtained, the bit bearing value that each downlink sub-carrier can be carried, the downstream bits bearing value of as each downlink sub-carrier can be calculated according to the SNR of each downlink sub-carrier.ONU brings together the downstream bits bearing value of each downlink sub-carrier in the downstream bits carrying table as the ONU.

Fig. 9 is the flow chart of OFDM-PON registration activation methods embodiment seven provided in an embodiment of the present invention, as shown in figure 9, the method for the present embodiment includes：

Step S901, receives the first ranging request information and descending training sequence that optical line terminal is sent by the optical network unit of certification.

Step S902, the downstream bits that optical network unit sends the first ranging response message and optical network unit to optical line terminal carry table and up training sequence, so that optical line terminal obtains the first distance measurement result.

Step S903, the downstream bits that optical network unit sends optical network unit to optical line terminal carry table and up training sequence, so that the upstream bits that optical line terminal calculates optical network unit according to up training sequence carry table and the upstream bits of table and optical network unit are carried according to the downstream bits of optical network unit Carrying meter is calculated and updates system descending bit carrying table and system uplink bit carrying table.

Step S904, optical network unit receives and updates the system descending bit carrying table and system uplink bit carrying table of optical line terminal transmission.

Step S905, optical network unit receives the second distance measurement request message that optical line terminal is sent.

Specifically, during due to receiving the first distance measurement request message that OLT is sent to ONU in step S1101, OLT does not obtain the downstream bits carrying table of the ONU also, and ONU does not obtain the upstream bits carrying table of the ONU to ONU during OLT the first ranging response messages of transmission yet.Therefore when OLT obtains the first distance measurement result, OLT and ONU do not know the bit bearing value of mutual uplink and downlink subcarrier, so the first distance measurement result is not necessarily accurate.Therefore after OLT and ONU have updated system descending bit carrying table and system uplink bit carrying table, ONU can receive the second distance measurement request message of OLT transmissions, carry out the second ranging flow.

Step S906, optical network unit sends second of ranging response message to optical line terminal, so that optical line terminal obtains the second distance measurement result.

Specifically, ONU sends the second ranging response message to OLT, so that OLT obtains the second distance measurement result.The second distance measurement result that OLT is obtained is obtained after it have updated system descending bit carrying table and system uplink bit carrying table, therefore the second distance measurement result is more accurate than the first distance measurement result, and OLT transmits the performance of data more preferably using the second distance measurement result with ONU.

Figure 10 is the flow chart of OFDM-PON registration activation methods embodiment eight provided in an embodiment of the present invention, and the present embodiment is the process that ONU is registered in the olt, and as shown in Figure 10, the method for the present embodiment includes：

Step S1001, optical network unit receives the login request message that optical line terminal is sent using acquiescence downstream bits carrying table.

Specifically, when OLT determines the ONU of registration in need in network, ONU receives the login request message of OLT transmissions, because the ONU is unregistered, therefore the bit carrying table of the ONU is not known, it is impossible to ensure that OLT and ONU are communicated by OLT bit carrying table.So ONU receives the login request message that OLT is sent using acquiescence downstream bits carrying table.Give tacit consent to downstream bits carrying table and Default upstream bit carrying table all uses relatively low bit bearing value on each subcarrier, to ensure to own

ONU can be with OLT proper communications in network as defined in standard.

Step S1002, optical network unit sends registration reply message using default upstream bit carrying table, and the registration reply message includes the sequence number of optical network unit.

Specifically, table is carried also without the downstream bits after renewal and upstream bits carry table in unregistered ONU, therefore, ONU carries table to OLT transmission registration reply messages using default upstream bit, and the bit bearing value that default upstream bit is carried in table is smaller.Each ONU has a unique sequence number（Serial Number, SN), for making OLT distinguish each ONU, the registration reply message that ONU is sent includes the sequence number of the ONU.

Step S1003, optical network unit receives the optical network unit marks that optical line terminal is sent, and the optical network unit marks are that optical line terminal determines the optical network unit of sequence number representative by being that the optical network unit that the sequence number is represented is distributed after certification.

Specifically, OLT is received after the sequence number of ONU transmissions, judges whether the ONU that the sequence number is represented is configured in the olt according to the sequence number.If the OLT determines that the ONU that the sequence number is represented is configured, ONU-ID is distributed for the ONU that the sequence number is represented.ONU-ID is the network identity that OLT is ONU distribution.ONU receives the OUN-ID that OLT is sent.

Second of authentication method：If OLT determines that the ONU of sequence number representative is configured but is not activated, OLT needs ONU to be authenticated.ONU first receives the authentication request message that OLT is sent；Then ONU sends authentication response message to OLT, and the authentication response message includes ONU certification mark and/or certification password；If OLT determines that ONU sequence number and ONU certification mark and/or certification password are legal, then OLT determines that the ONU that the ONU that the sequence number is represented has been represented by certification and for the sequence number distributes optical network unit marks, and ONU receives the ONU-ID that OLT is sent.If OLT determines that ONU sequence number and ONU certification mark and/or certification password are illegal, refusal ONU is by certification, and register flow path terminates.

The third authentication method：After OLT receives the sequence number of ONU transmissions, determine that the ONU of sequence number representative is not configured in the olt and be not activated, then the certification that ONU receptions OLT is sent please Message is sought, the authentication request message includes OLT and distributes interim ONU-ID for the ONU;Then ONU sends authentication response message to OLT, and the authentication response message includes ONU certification mark and/or certification password；If OLT determines that ONU sequence number and ONU certification mark and/or certification password are legal, OLT determines ONU by certification；Following ONU receives the lower line that OLT is sent；Then ONU receives the login request message that OLT is resend；ONU resends registration reply message to OLT, and the registration reply message resend includes ONU sequence number；Last ONU receives the formal ONU-ID that OLT is sent.

In addition, after OLT receives the sequence number of ONU transmissions, determine that the ONU of sequence number representative is not configured in the olt and be not activated, then before ONU receives the authentication request message that OLT is sent, in addition to：ONU receives the 3rd distance measurement request message that OLT is sent；ONU sends the 3rd ranging response message to OLT, so that OLT obtains the 3rd distance measurement result.

Fig. 8 is into embodiment illustrated in fig. 10, only account for the situation of the OFDM-PON systems of Single wavelength, for the OFDM-PON systems based on Nyquist multiplexing technologies and the multi-wavelength OFDM-PON systems based on WDM technology, its registration activation method difference.

Figure 11 is the flow chart of OFDM-PON registration activation methods embodiment nine provided in an embodiment of the present invention, and the present embodiment is the registration activation method of the OFDM-PON systems based on Nyquist multiplexing technologies, and as shown in figure 11, the method for the present embodiment includes：

Step S1101, optical network unit receives the login request message that optical line terminal is sent in the spectral range or all downstream spectrum scopes or management passage of acquiescence using acquiescence downstream bits carrying table.

Step S1102, optical network unit carries the registration reply message that table is sent using default upstream bit, and the registration reply message includes the sequence number of optical network unit.

Step S1103, optical network unit receives the optical network unit marks that optical line terminal is sent, and the optical network unit marks are that optical line terminal determines the optical network unit of sequence number representative by being that the optical network unit that the sequence number is represented is distributed after certification.

Step S1104, receives the first ranging request information and descending training sequence that optical line terminal is sent by the optical network unit of certification.

Step S1105, optical network unit receives the frequency spectrum distribution information that optical line terminal is sent. Spectrum operation scope is adjusted to target wave band by step S1106, optical network unit according to frequency spectrum distribution information by the electric tunable filter of regulation.

Step S1107, the downstream bits that optical network unit sends the first ranging response message and optical network unit to optical line terminal carry table and up training sequence, so that optical line terminal obtains the first distance measurement result.

Step S1108, the downstream bits that optical network unit sends optical network unit to optical line terminal carry table and up training sequence, so that optical line terminal is calculated according to the upstream bits carrying meter of the upstream bits carrying table of up training sequence calculating optical network unit and the downstream bits carrying table according to optical network unit and optical network unit and updates system descending bit carrying table and system uplink bit carrying table.

Step S1109, optical network unit receives and updates the system descending bit carrying table and system uplink bit carrying table of optical line terminal transmission.

Step S1110, optical network unit receives the second distance measurement request message that optical line terminal is sent.Step S1111, optical network unit sends second of ranging response message to optical line terminal, so that optical line terminal obtains the second distance measurement result.

In addition, in embodiment illustrated in fig. 11, after step S 1105 and step S 1106 are the sequence number that OLT receives ONU transmissions, determine what is carried out after ONU that the sequence number represents is configured in the olt.If OLT is received after the sequence number of ONU transmissions, determine that the ONU of sequence number representative is not configured in the olt not being activated, then without step S1105 and step S1106, but it is similar with step S1003 in embodiment illustrated in fig. 10, before optical network unit receives the login request message that optical line terminal is resend, in addition to：Optical network unit receives the frequency spectrum distribution information that optical line terminal is sent；Spectrum operation scope is adjusted to target wave band by optical network unit according to frequency spectrum distribution information by the electric tunable filter of regulation.

The flow chart of Figure 12 OFDM-PON registration activation methods embodiments ten provided in an embodiment of the present invention, the present embodiment is the registration activation method of the multi-wavelength OFDM-PON systems based on WDM technology, and as shown in figure 12, the method for the present embodiment includes：

Step S1201, optical network unit receives the login request message that optical line terminal is sent in the initial wavelength or public administration wavelength of all downstream wavelengths or acquiescence using acquiescence downstream bits carrying table.

Step S1202, optical network unit is by adjusting in any upstream wavelength after light adjustable transmitter or being sent with receiving optical network unit in the corresponding upstream wavelength of downstream wavelength of login request message using in acquiescence The registration reply message that row bit carrying table is sent, the registration reply message includes the sequence number of optical network unit.

Specifically, when the up-downgoing wavelength of OFDM-PON systems is unbound, optical network unit is by adjusting the registration reply message sent after light adjustable transmitter in any upstream wavelength using default upstream bit carrying table；When the up-downgoing wavelength binding of OFDM-PON systems, optical network unit is by adjusting the registration reply message sent after light adjustable transmitter in upstream wavelength corresponding with the downstream wavelength of reception optical network unit transmission login request message using default upstream bit carrying table.

Step S1203, optical network unit receives the optical network unit marks that optical line terminal is sent, and the optical network unit marks are that optical line terminal determines the optical network unit of sequence number representative by being that the optical network unit that the sequence number is represented is distributed after certification.

Step S1204, receives the first ranging request information and descending training sequence that optical line terminal is sent by the optical network unit of certification.

Step S1205, optical network unit receives the Wavelength Assignment information that optical line terminal is sent, and the Wavelength Assignment information is that optical line terminal is what optical network unit was distributed.

Step S1206, optical network unit adjusts the wavelength of optical network unit optical sender and photoreceiver according to Wavelength Assignment information.

Step S1207, the downstream bits that optical network unit sends the first ranging response message and optical network unit to optical line terminal carry table and up training sequence, so that optical line terminal obtains the first distance measurement result.

Step S1208, the downstream bits that optical network unit sends optical network unit to optical line terminal carry table and up training sequence, so that optical line terminal is calculated according to the upstream bits carrying meter of the upstream bits carrying table of up training sequence calculating optical network unit and the downstream bits carrying table according to optical network unit and optical network unit and updates system descending bit carrying table and system uplink bit carrying table.

Step S1209, optical network unit receives and updates the system descending bit carrying table and system uplink bit carrying table of optical line terminal transmission.

Step S1210, optical network unit receives the second distance measurement request message that optical line terminal is sent.Step S1211, optical network unit sends second of ranging response message to optical line terminal, so that optical line terminal obtains the second distance measurement result.

In addition, in embodiment illustrated in fig. 12, step S1205 and step S1206 are that OLT receives ONU After the sequence number of transmission, determine what is carried out after ONU that the sequence number is represented is configured in the olt.If OLT is received after the sequence number of ONU transmissions, determine that the ONU of sequence number representative is not configured in the olt not being activated, then without step S1205 and step S1206, but it is similar with step S1003 in embodiment illustrated in fig. 10, before optical network unit receives the login request message that optical line terminal is resend, in addition to：Optical network unit receives the Wavelength Assignment information that optical line terminal is sent, and the Wavelength Assignment information is that optical line terminal is what optical network unit was distributed；Optical network unit adjusts the wavelength of optical network unit optical sender and photoreceiver according to Wavelength Assignment information.

Figure 13 is OFDM-PON registration activation methods embodiment ^ mono- provided in an embodiment of the present invention signaling process figure, the present embodiment is the registration activation method of Single wavelength OFDM-PON systems, ONU is configured in the olt in the present embodiment and is activated, as shown in figure 13, the method for the present embodiment includes：Step S1301, OLT send ONU registration requests with default bit carrying table.

Step S1302, ONU are with default bit carrying table response registration request.

Step S1303, if SN is configured and is activated, OLT is the ONU distribution ONU-ID that the SN is represented, i.e., complete certification by SN.

Step S1304, OLT initiate first time ranging, are completed under ONU cooperation.

Step S1305, training sequence is included in the descending PMD frames that OLT is sent, ONU calculates the SNR of each subcarrier according to the training sequence of reception, and calculates the downstream bits carrying table of the ONU, and the ONU calculated downstream bits carrying table is issued into OLT.

Step S1306, training sequence is also included in the up PMD frames that ONU is sent, OLT calculates the SNR of each subcarrier according to the training sequence for receiving ONU, and calculates the upstream bits carrying table of the ONU, and upstream bits carrying table is sent into ONU with default bit carrying table.

Step S1307, OLT carry meter calculation system downstream bits carrying table according to the ONU received downstream bits, and are sent to ONU.

Step S1308, OLT and ONU more new system uplink and downlink bit carry table, and OLT restarting rangings, ONU is responded and completed second of ranging.

Figure 14 is the signaling process figure of OFDM-PON registration activation methods embodiment 12 provided in an embodiment of the present invention, the present embodiment is the registration activation method of Single wavelength OFDM-PON systems, ONU is configured in the olt in the present embodiment but is not activated, as shown in figure 14, the method for the present embodiment includes：Step S1401, OLT send ONU registration requests with default bit carrying table.

Step S1402, ONU are with default bit carrying table response registration request. Step S1403, OLT send certification request, and certification request can in a frame be completed with ONU registration requests or distance measurement request.

Step S1404, ONU response certification request, including certification password（Password) or certification mark（RegisterlD) .

Step S1405, if SN+ (Password or RegisterlD) is legal, OLT is that the ONU distributes ONU-ID, that is, completes certification.

Step S1406, OLT initiate first time ranging, are completed under ONU cooperation.

Step S1407, training sequence is included in the descending PMD frames that OLT is sent, ONU calculates the SNR of each subcarrier according to the training sequence of reception, and calculates the downstream bits carrying table of the ONU, and the ONU calculated downstream bits carrying table is issued into OLT.

Step S1408, training sequence is also included in the up PMD frames that ONU is sent, OLT calculates the SNR of each subcarrier according to the training sequence for receiving ONU, and calculates the upstream bits carrying table of the ONU, and upstream bits carrying table is sent into ONU with default bit carrying table.

Step S1409, OLT carry meter calculation system downstream bits carrying table according to the ONU received downstream bits, and are sent to ONU.

Step S1410, OLT and ONU more new system uplink and downlink bit carry table, and OLT restarting rangings, ONU is responded and completed second of ranging.

Figure 15 is the signaling process figure of OFDM-PON registration activation methods embodiment 13 provided in an embodiment of the present invention, the present embodiment is the registration activation method of Single wavelength OFDM-PON systems, ONU is not configured be not activated in the olt in the present embodiment, as shown in figure 15, the method for the present embodiment includes：Step S1501, OLT send ONU registration requests with default bit carrying table.

Step S1502, ONU are with default bit carrying table response registration request.

Step S1503, to unknown SN ONU, OLT first distributes interim ONU-ID.

Step S1504, OLT initiate first time ranging, are completed under ONU cooperation.

Step S1505, OLT send certification request, and certification request can in a frame be completed with ONU registration requests or distance measurement request.

Step S1506, ONU response certification request, including certification password（Password) or certification mark（RegisterlD) .

Step S1507, if SN+ (Password or RegisterlD) is legal, OLT is that the ONU distributes ONU-ID, that is, completes certification. Step S1508, OLT sends line Deactivate_ONU-ID under ONU, and discharges interim ONU-ID.

Step S1509, OLT initiate ONU registration requests again.

Step S1510, ONU response registration request.

Step S1511, OLT distribute corresponding ONU-ID, i.e., formal ONU-ID to known SN.Step S1512, OLT initiate second of ranging, are completed under ONU cooperation.

Step S1513, training sequence is included in the descending PMD frames that OLT is sent, ONU calculates the SNR of each subcarrier according to the training sequence of reception, and calculates the downstream bits carrying table of the ONU, and the ONU calculated downstream bits carrying table is issued into OLT.

Step S1514, training sequence is also included in the up PMD frames that ONU is sent, OLT calculates the SNR of each subcarrier according to the training sequence for receiving ONU, and calculates the upstream bits carrying table of the ONU, and upstream bits carrying table is sent into ONU with default bit carrying table.

Step S1515, OLT carry meter calculation system downstream bits carrying table according to the ONU received downstream bits, and are sent to ONU.

Step S1516, OLT and ONU more new system uplink and downlink bit carry table, and OLT restarting rangings, ONU is responded and completed third time ranging.

Figure 13 is into embodiment illustrated in fig. 15, for downlink data, in normal operating phase, there is two kinds of working methods, and respectively descending each subcarrier is to be time-multiplexed（Time Division Multiplexing, TDM) mode works, 1 symbol of g Jie（Symbol ONU data) are only transmitted, its bit carrying table is just sent to the bit carrying table of the symbol when sending certain ONU data as OLT, each symbol head is included ONU-ID information, represented with default bit bearing value；Or descending each subcarrier is with frequency division multiplexing（Frequency Division Multiplexing, FDM) mode works, and as different ONU distributes different subcarriers, and downstream bits are carried table and constituted with the bit bearing value of each ONU correspondence subcarriers.Upstream data ONU works in a tdm fashion in area of light, i.e., 1 symbol only transmits ONU data, and in normal operating phase, OLT is according to Bandwidth map figure（Bandwidth Map, BWMAP) switch the carrying table of the bit used in receiving, such as gigabit passive optical network similar with existing TDM-PON（Gigabit Passive Optical Network, GPON), Ethernet passive optical network（Ethernet Passive Optical Network, EPON) 、 10G-EPON、 10G-GPON.

Figure 16 is the signaling process figure of OFDM-PON registration activation methods embodiment 14 provided in an embodiment of the present invention, and the present embodiment is the registration activation of the OFDM-PON systems based on Nyquist multiplexing technologies ONU is configured in the olt in method, the present embodiment and is activated, as shown in figure 16, and the method for the present embodiment includes：

Step S1601, OLT send ONU registration requests in the spectral range or all downstream spectrum scopes or management passage of acquiescence with default bit carrying table.

Step S1602, the electric tunable filter of ONU regulations, make its spectral range in acquiescence spectral range corresponding with OLT or all downstream spectrum scopes or management passage, downlink frame is received with default bit carrying table, and its sequence number SN is sent with default bit carrying table, respond registration request.

Step S1603, if SN is configured and is activated, OLT is the ONU distribution ONU-ID that the SN is represented, i.e., complete certification by SN.

Step S1604, OLT initiate first time ranging, are completed under ONU cooperation.

Step S1605, OLT distribute ONU downstream spectrum working range, that is, determine that ONU is worked with baseband mode or with mixed mode.

Step S1606, ONU adjust the spectrum operation scope of downlink electrical tunable filter to target wave band according to receive information.

Step S1607, OLT send training sequence in new downstream spectrum with default bit carrying table.Step S1608, ONU calculate the SNR of each subcarrier according to received training sequence, and calculate the downstream bits carrying table of the ONU, and the ONU calculated downstream bits carrying table is issued into OLT.

Step S1609, training sequence is also included in the up PMD frames that ONU is sent, OLT calculates the SNR of each subcarrier according to the training sequence for receiving ONU, and calculates the upstream bits carrying table of the ONU, and upstream bits carrying table is sent into ONU with default bit carrying table.

Step S1610, OLT carry meter calculation system downstream bits carrying table according to the ONU received downstream bits, and are sent to ONU.

Step S1611, OLT and ONU more new system uplink and downlink bit carry table, and OLT restarting rangings, ONU is responded and completed second of ranging.

Figure 17 is the signaling process figure of OFDM-PON registration activation methods embodiment 15 provided in an embodiment of the present invention, the present embodiment is the registration activation method of the OFDM-PON systems based on Nyquist multiplexing technologies, ONU is configured in the olt in the present embodiment but is not activated, as shown in figure 17, the method for the present embodiment includes：

Step S1701, OLT send ONU registration requests in the spectral range or all downstream spectrum scopes or management passage of acquiescence with default bit carrying table. Step S1702, the electric tunable filter of ONU regulations, make its spectral range in acquiescence spectral range corresponding with OLT or all downstream spectrum scopes or management passage, downlink frame is received with default bit carrying table, and its sequence number SN is sent with default bit carrying table, respond registration request.

Step S1703, OLT send certification request, and certification request can in a frame be completed with ONU registration requests or distance measurement request.

Step S1704, ONU response certification request, including certification password（Password) or certification mark（RegisterlD) .

Step S1705, if SN+ (Password or RegisterlD) is legal, OLT is that the ONU distributes ONU-ID, that is, completes certification.

Step S1706, OLT initiate first time ranging, are completed under ONU cooperation.

Step S1707, OLT distribute ONU downstream spectrum working range, that is, determine that ONU is worked with baseband mode or with mixed mode.

Step S1708, ONU adjust the spectrum operation scope of downlink electrical tunable filter to target wave band according to receive information.

Step S1709, OLT send training sequence in new downstream spectrum with default bit carrying table.Step S1710, ONU calculate the SNR of each subcarrier according to the training sequence of reception, and calculate the downstream bits carrying table of the ONU, and the ONU calculated downstream bits carrying table is issued into OLT.

Step S1711, training sequence is also included in the up PMD frames that ONU is sent, OLT calculates the SNR of each subcarrier according to the training sequence for receiving ONU, and calculates the upstream bits carrying table of the ONU, and upstream bits carrying table is sent into ONU with default bit carrying table.

Step S1712, OLT carry meter calculation system downstream bits carrying table according to the ONU received downstream bits, and are sent to ONU.

Step S1713, OLT and ONU more new system uplink and downlink bit carry table, and OLT restarting rangings, ONU is responded and completed second of ranging.

Figure 18 is the signaling process figure of OFDM-PON registration activation methods embodiment 16 provided in an embodiment of the present invention, the present embodiment is the registration activation method of the OFDM-PON systems based on Nyquist multiplexing technologies, ONU is not configured be not activated in the olt in the present embodiment, as shown in figure 18, the method for the present embodiment includes：

Step S1801, OLT acquiescence spectral range or all downstream spectrum scopes or management passage, ONU registration requests are sent with default bit carrying table.

Step S1802, the electric tunable filter of ONU regulations, make its spectral range in acquiescence spectral range corresponding with OLT or all downstream spectrum scopes or management passage, downlink frame is received with default bit carrying table, and its sequence number SN is sent with default bit carrying table, respond registration request.

Step S1803, to unknown SN ONU, OLT first distributes interim ONU-ID.

Step S1804, OLT initiate first time ranging, are completed under ONU cooperation.

Step S1805, OLT send certification request, and certification request can in a frame be completed with ONU registration requests or distance measurement request.

Step S1806, ONU response certification request, including certification password（Password) or certification mark（RegisterlD) .

Step SI 807, if SN+ (Password or RegisterlD) is legal, OLT is that the ONU distributes ONU-ID, that is, completes certification.

Step S1808, OLT distribute ONU downstream spectrum working range, that is, determine that ONU is worked with baseband mode or with mixed mode.

Step S1809, OLT sends line Deactivate_ONU-ID under ONU, and discharges interim

ONU-ID

Step S1810, ONU adjust the spectrum operation scope of downlink electrical tunable filter to target wave band according to receive information.

Registration request.

Step S1813, OLT distribute corresponding ONU-ID, i.e., formal ONU-ID to known SN.Step S1814, OLT initiate second of ranging, are completed under ONU cooperation.

Step S1815, training sequence is included in the descending PMD frames that OLT is sent, ONU calculates the SNR of each subcarrier according to the training sequence of reception, and calculates the downstream bits carrying table of the ONU, and the ONU calculated downstream bits carrying table is issued into OLT.

Step S1816, training sequence is also included in the up PMD frames that ONU is sent, OLT calculates the SNR of each subcarrier according to the training sequence for receiving ONU, and calculates the upstream bits carrying table of the ONU, and upstream bits carrying table is sent into ONU with default bit carrying table.

Step S1817, OLT carry meter calculation system downstream bits carrying table according to the ONU received downstream bits, and are sent to ONU. Step S1818, OLT and ONU more new system uplink and downlink bit carry table, and OLT restarting rangings, ONU is responded and completed third time ranging.

Figure 16 is into embodiment illustrated in fig. 18, for downlink data, and descending frequency spectrum is divided into two wave bands, is worked in the way of frequency division or Nyquist multiplexings, ONU selects one of band operation by electric tunable filter.In normal operating phase, on each wave band, there are two kinds of working methods, respectively descending each subcarrier works in a tdm fashion, i.e. 1 symbol only transmits ONU data, its bit carrying table is just sent to the bit carrying table of the symbol as OLT, each symbol head is included ONU-ID information, represented with default bit bearing value when sending certain ONU data；Or descending each subcarrier is worked in FDM modes, as different ONU distributes different subcarriers, and downstream bits are carried table and constituted with the bit bearing value of each ONU correspondence subcarriers.Upstream data ONU works in a tdm fashion in area of light, i.e. 1 symbol only transmits ONU data, in normal operating phase, OLT switches the bit used in receiving according to BWMAP and carries table, it is similar with existing TDM-PON, such as GPON, EPON, 10G-EPON, 10G-GPON.

Figure 19 is the signaling process figure of OFDM-PON registration activation methods embodiment 17 provided in an embodiment of the present invention, the present embodiment is the registration activation method of the multi-wavelength OFDM-PON systems based on WDM technology, ONU is configured in the olt in the present embodiment and is activated, as shown in figure 19, the method for the present embodiment includes：

Step S1901, OLT carry table in the initial wavelength or public administration wavelength of all downstream wavelengths or acquiescence with default bit, send ONU registration requests.

Step S1902, ONU adjust optic tunable filter to the initial wavelength or public administration wavelength of any downstream wavelength or acquiescence, and downlink frame is received with default bit carrying table, and ONU adjusts optical sender to upstream wavelength corresponding with downstream wavelength（The scene of up-downgoing wavelength binding）Or any wavelength（Up-downgoing wavelength unbundling）On, and its sequence number SN is sent with default bit carrying table, respond registration request.

Step S1903, if SN is configured and is activated, OLT is the ONU distribution ONU-ID that the SN is represented, i.e., complete certification by SN.

Step S1904, OLT initiate first time ranging, are completed under ONU cooperation.

Step S1905, OLT distribution ONU uplink and downlink operation wavelength, ONU is sent to default bit carrying table.

Step S1906, ONU set ONU optical sender and the operation wavelength of receiver according to Wavelength Assignment information. Step S1907, OLT send training sequence in new downstream wavelength with default bit carrying table.Step S1908, ONU calculate the SNR of each subcarrier according to the training sequence of reception, and calculate the downstream bits carrying table of the ONU, then should with default bit carrying table in new upstream wavelength

ONU downstream bits carrying table and training sequence sends OLT.

Step S1909, OLT calculate the SNR of each subcarrier according to the training sequence for receiving ONU, and calculate the upstream bits carrying table of the ONU, and upstream bits carrying table is sent into ONU with default bit carrying table.

Step S1910, OLT carry meter calculation system downstream bits carrying table according to the ONU received downstream bits, and are sent to ONU.

Step S1911, OLT and ONU more new system uplink and downlink bit carry table, and OLT restarting rangings, ONU is responded and completed second of ranging.

Figure 20 is the signaling process figure of OFDM-PON registration activation methods embodiment 18 provided in an embodiment of the present invention, the present embodiment is the registration activation method of the multi-wavelength OFDM-PON systems based on WDM technology, ONU is configured in the olt in the present embodiment but is not activated, as shown in figure 20, the method for the present embodiment includes：

Step S2001, OLT carry table in the initial wavelength or public administration wavelength of all downstream wavelengths or acquiescence with default bit, send ONU registration requests.

Step S2002, ONU adjust optic tunable filter to the initial wavelength or public administration wavelength of any downstream wavelength or acquiescence, and downlink frame is received with default bit carrying table, and ONU adjusts optical sender to upstream wavelength corresponding with downstream wavelength（The scene of up-downgoing wavelength binding）Or any wavelength（Up-downgoing wavelength unbundling）On, and its sequence number SN is sent with default bit carrying table, respond registration request.

Step S2003, OLT send certification request, and certification request can in a frame be completed with ONU registration requests or distance measurement request.

Step S2004, ONU response certification request, including certification password（Password) or certification mark（RegisterlD) .

Step S2005, if SN+ (Password or RegisterlD) is legal, OLT is that the ONU distributes ONU-ID, that is, completes certification.

Step S2006, OLT initiate first time ranging, are completed under ONU cooperation.

Step S2007, OLT distribution ONU uplink and downlink operation wavelength, ONU is sent to default bit carrying table. Step S2008, ONU set ONU optical sender and the operation wavelength of receiver according to Wavelength Assignment information.

Step S2009, OLT send training sequence in new downstream wavelength with default bit carrying table.Step S2010, ONU calculate the SNR of each subcarrier according to the training sequence of reception, and calculate the downstream bits carrying table of the ONU, then should with default bit carrying table in new upstream wavelength

ONU downstream bits carrying table and training sequence sends OLT.

Step S2011, OLT calculate the SNR of each subcarrier according to the training sequence for receiving ONU, and calculate the upstream bits carrying table of the ONU, and upstream bits carrying table is sent into ONU with default bit carrying table.

Step S2012, OLT carry meter calculation system downstream bits carrying table according to the ONU received downstream bits, and are sent to ONU.

Step S2013, OLT and ONU more new system uplink and downlink bit carry table, and OLT restarting rangings, ONU is responded and completed second of ranging.

Figure 21 is the signaling process figure of OFDM-PON registration activation methods embodiment 19 provided in an embodiment of the present invention, the present embodiment is the registration activation method of the multi-wavelength OFDM-PON systems based on WDM technology, ONU is not configured be not activated in the olt in the present embodiment, as shown in figure 21, the method for the present embodiment includes：

Step S2101, OLT carry table in the initial wavelength or public administration wavelength of all downstream wavelengths or acquiescence with default bit, send ONU registration requests.

Step S2102 ONU adjust optic tunable filter to the initial wavelength or public administration wavelength of any downstream wavelength or acquiescence, and downlink frame is received with default bit carrying table, and ONU adjusts optical sender to upstream wavelength corresponding with downstream wavelength（The scene of up-downgoing wavelength binding）Or any wavelength（Up-downgoing wavelength unbundling）On, and its sequence number SN is sent with default bit carrying table, respond registration request.

Step S2103, to unknown SN ONU, OLT first distributes interim ONU-ID.

Step S2104, OLT initiate first time ranging, are completed under ONU cooperation.

Step S2105, OLT send certification request, and certification request can in a frame be completed with ONU registration requests or distance measurement request.

Step S2106, ONU response certification request, including certification password（Password) or certification mark（RegisterlD) .

Step S2107, if SN+ (Password or RegisterlD) is legal, OLT is the ONU ONU-ID is distributed, that is, completes certification.

Step S2108, OLT distribution ONU uplink and downlink operation wavelength, ONU is sent to default bit carrying table.

Step S2109, OLT sends line Deactivate_ONU-ID under ONU, and discharges preliminary step S2110, ONU according to Wavelength Assignment information setting ONU optical sender and the operation wavelength of receiver.

Step S2111, OLT initiate ONU registration requests again.

Step S2112, ONU response registration request.

Step S2113, OLT distribute corresponding ONU-ID, i.e., formal ONU-ID to known SN.Step S2114, OLT initiate second of ranging, are completed under ONU cooperation.

Step S2115, training sequence is included in the descending PMD frames that OLT is sent, ONU calculates the SNR of each subcarrier according to the training sequence of reception, and calculates the downstream bits carrying table of the ONU, and the ONU calculated downstream bits carrying table is issued into OLT.

Step S2116, training sequence is also included in the up PMD frames that ONU is sent, OLT calculates the SNR of each subcarrier according to the training sequence for receiving ONU, and calculates the upstream bits carrying table of the ONU, and upstream bits carrying table is sent into ONU with default bit carrying table.

Step S2117, OLT carry meter calculation system downstream bits carrying table according to the ONU received downstream bits, and are sent to ONU.

Step S2118, OLT and ONU more new system uplink and downlink bit carry table, and OLT restarting rangings, ONU is responded and completed third time ranging.

Figure 19 is into embodiment illustrated in fig. 21, for downlink data, the descending wavelength according to light carrier is divided into different passages, and ONU selects one of downstream wavelength to work by optic tunable filter, by adjusting the wavelength of adjustable transmitter one of upstream wavelength can be selected to work.In normal operating phase, on each wavelength channel, there are two kinds of working methods, respectively descending each subcarrier is worked in TDM modes, i.e. 1 symbol only transmits ONU data, its bit carrying table is just sent to the bit carrying table of the symbol as OLT, each symbol head is included ONU-ID information, represented with default bit bearing value when sending certain ONU data；Or descending each subcarrier is worked in FDM modes, as different ONU distributes different subcarriers, and downstream bits are carried table and constituted with the bit bearing value of each ONU correspondence subcarriers.Upstream data ONU works in a tdm fashion in area of light, i.e., 1 symbol ONU data are only transmitted, in normal operating phase, 0LT switches the bit used in receiving according to BWMAP and carries table, such as GPON, EPON, 10G-EPON, 10G-GPON similar with existing TDM-PON.

Figure 22 is the structural representation of optical line terminal embodiment one provided in an embodiment of the present invention, and as shown in figure 22, the optical line terminal of the present embodiment includes：

Sending module 221, for sending descending training sequence to the optical network unit by certification.Receiving module 222, downstream bits carrying table and up training sequence for receiving the optical network unit that the optical network unit is sent, the downstream bits carrying table of the optical network unit is that the optical network unit is calculated according to the descending training sequence.

Computing module 223, the upstream bits for calculating the optical network unit according to the up training sequence carry table.

Update module 224, the upstream bits carrying meter for the downstream bits carrying table according to the optical network unit and the optical network unit is calculated and updates system descending bit carrying table and system uplink bit carrying table.

Sending module 221, is additionally operable to send the system descending bit carrying table and the system uplink bit carrying table to the optical network unit, so that the optical network unit updates the system descending bit carrying table and system uplink bit carrying table.

The optical line terminal of the present embodiment is used for the technical scheme for performing embodiment of the method shown in Fig. 3, and its implementing principle and technical effect is similar, and here is omitted.

Further, in embodiment illustrated in fig. 22, computing module 223, the signal to noise ratio specifically for calculating each uplink sub-carrier for receiving the up training sequence according to the up training sequence；The upstream bits of optical network unit carry table according to the signal-to-noise ratio computation for each uplink sub-carrier for receiving the up training sequence.

Further, in embodiment illustrated in fig. 22, update module 224, the less one bit bearing value as the downlink sub-carrier in bit bearing value specifically for the system descending bit to be carried to table downlink sub-carrier identical with the downstream bits carrying table of the optical network unit, to update the system descending bit carrying table；The system uplink bit is carried to the less one bit bearing value as the uplink sub-carrier in the bit bearing value of table uplink sub-carrier identical with the upstream bits carrying table of the optical network unit, to update the system uplink bit carrying table；Or the upstream bits that the upstream bits of the optical network unit carry table and other optical network units are carried table collectively as the system by the optical line terminal Upstream bits carry table.

Further, in embodiment illustrated in fig. 22, sending module 221 is additionally operable to send the second distance measurement request message to the optical network unit；Receiving module 222, is additionally operable to receive the second ranging response message that the optical network unit is sent, to obtain the second distance measurement result.

Figure 23 is the structural representation of optical line terminal embodiment two provided in an embodiment of the present invention, is such as schemed

Shown in 23, the optical line terminal of the present embodiment on the basis of Figure 22,

Sending module 221, is also used for acquiescence downstream bits carrying table and sends login request message to the optical network unit.

Receiving module 222, is additionally operable to receive the registration reply message that the optical network unit uses default upstream bit carrying table to send, the registration reply message includes the sequence number of the optical network unit；The optical line terminal also includes：Authentication module 225, for determining that the optical network unit that the optical network unit that the sequence number is represented has been represented by certification and for the sequence number distributes optical network unit marks.

Sending module 221, is additionally operable to send the optical network unit marks to the optical network unit.The optical line terminal of the present embodiment is used for the technical scheme for performing embodiment of the method shown in Fig. 5, and its implementing principle and technical effect is similar, and here is omitted.

Further, in embodiment illustrated in fig. 23, authentication module 225, specifically for if it is determined that the optical network unit that represents of the sequence number is configured and be activated, it is determined that the optical network unit that the optical network unit that the sequence number is represented has been represented by certification and for the sequence number distributes the optical network unit marks.

Further, in embodiment illustrated in fig. 23, authentication module 225, specifically for if it is determined that the optical network unit that represents of the sequence number is configured but be not activated, then sending authentication request message to the optical network unit；The authentication response message that the optical network unit is sent is received, the authentication response message includes the certification mark and/or certification password of the optical network unit；If it is determined that the certification mark and/or certification password of the sequence number of the optical network unit and the optical network unit are legal, it is determined that the optical network unit that the optical network unit that the sequence number is represented has been represented by certification and for the sequence number distributes the optical network unit marks.

Further, in embodiment illustrated in fig. 23, authentication module 225, specifically for if it is determined that the sequence number of the optical network unit is not configured and is not activated, being then that the optical network unit distributes interim optical network unit marks；Authentication request message is sent to the optical network unit；The authentication response message that the optical network unit is sent is received, the authentication response message includes the certification mark and/or certification password of the optical network unit；If it is determined that the certification mark of the sequence number of the optical network unit and the optical network unit and/ Or certification password is legal, it is determined that the optical network unit passes through certification；Lower line is sent to the optical network unit, and discharges the casual network mark；The login request message is resend to the optical network unit；The registration reply message that the optical network unit is resend is received, and the optical network unit represented for the sequence number distributes the optical network unit marks.

Further, in embodiment illustrated in fig. 23, sending module 221 is additionally operable to send the 3rd distance measurement request message to the optical network unit；Receiving module 222, is additionally operable to receive the 3rd ranging response message that the optical network unit is sent, to obtain the 3rd distance measurement result.

Further, in embodiment illustrated in fig. 23, sending module 221 carries table to optical network unit transmission login request message specifically for the spectral range in acquiescence or all downstream spectrum scopes or management passage using acquiescence downstream bits.

Figure 24 be optical line terminal embodiment three provided in an embodiment of the present invention structural representation, as shown in figure 24, the optical line terminal of the present embodiment on the basis of Figure 23, in addition to：

Frequency spectrum distribute module 226, for sending frequency spectrum distribution information to the optical network unit, so that spectrum operation scope is adjusted to target wave band by the optical network unit according to frequency spectrum distribution information by the electric tunable filter of regulation.

The optical line terminal of the present embodiment is used for the technical scheme for performing embodiment of the method shown in Fig. 6, and its implementing principle and technical effect is similar, and here is omitted.

Further, in embodiment illustrated in fig. 23, sending module 221, specifically for carrying table to optical network unit transmission login request message using acquiescence downstream bits in the initial wavelength of all downstream wavelengths or acquiescence or public administration wavelength；Receiving module 222, use the registration reply message of default upstream bit carrying table transmission after light adjustable transmitter in any upstream wavelength or upstream wavelength corresponding with the downstream wavelength that the reception optical network unit sends login request message by adjusting specifically for receiving the optical network unit, the registration reply message includes the sequence number of the optical network unit.

Figure 25 be optical line terminal example IV provided in an embodiment of the present invention structural representation, as shown in figure 25, the optical line terminal of the present embodiment on the basis of Figure 23, in addition to：

Wavelength Assignment module 227, for distributing upstream wavelength and downstream wavelength for the optical network unit；Wavelength Assignment information is sent to the optical network unit, so that the optical network unit adjusts the wavelength of the optical network unit optical sender and photoreceiver according to the Wavelength Assignment information.

The optical line terminal of the present embodiment is used for the technical scheme for performing embodiment of the method shown in Fig. 7, and its implementing principle and technical effect is similar, and here is omitted. Figure 26 is the structural representation of optical network unit embodiment one provided in an embodiment of the present invention, and as shown in figure 26, the optical network unit of the present embodiment includes：

Receiving module 261, the descending training sequence for receiving optical line terminal transmission.

Computing module 262, the downstream bits for calculating the optical network unit according to the descending training sequence carry table.

Sending module 263, downstream bits for sending from the optical network unit to the optical line terminal carry table and up training sequence, so that the optical line terminal is calculated according to the upstream bits carrying meter of the upstream bits carrying table of the up training sequence calculating optical network unit and the downstream bits carrying table according to the optical network unit and the optical network unit and updates system descending bit carrying table and system uplink bit carrying table.

Update module 264, for receiving and updating the system descending bit carrying table and the system uplink bit carrying table that the optical line terminal is sent.

The optical network unit of the present embodiment is used for the technical scheme for performing embodiment of the method shown in Fig. 8, and its implementing principle and technical effect is similar, and here is omitted.

Further, in embodiment illustrated in fig. 26, computing module 263, the signal to noise ratio specifically for calculating each downlink sub-carrier for receiving the descending training sequence according to the descending training sequence；The downstream bits of optical network unit carry table according to the signal-to-noise ratio computation for each downlink sub-carrier for receiving the descending training sequence.

Further, in embodiment illustrated in fig. 26, receiving module 261 is additionally operable to receive the second distance measurement request message that the optical line terminal is sent；Sending module 262, is additionally operable to send second of ranging response message to the optical line terminal, so that the optical line terminal obtains the second distance measurement result.

Further, in embodiment illustrated in fig. 26, receiving module 261 is additionally operable to receive the login request message that the optical line terminal is sent using acquiescence downstream bits carrying table；Sending module 262, is also used for default upstream bit carrying table and sends registration reply message, the registration reply message includes the sequence number of the optical network unit；Receiving module 261, it is additionally operable to receive the optical network unit marks that the optical line terminal is sent, the optical network unit marks are that the optical line terminal determines the optical network unit of the sequence number representative by being that the optical network unit that the sequence number is represented is distributed after certification.

Further, in embodiment illustrated in fig. 26, receiving module 261, specifically for receiving the optical network unit marks that the optical line terminal is sent, the optical network unit marks are that the optical line terminal determines that optical network unit that the sequence number is represented is configured and is the optical-fiber network that the sequence number is represented after being activated Unit distribution.

Further, in embodiment illustrated in fig. 26, receiving module 261, specifically for receiving the authentication request message that the optical line terminal is sent, the authentication request message is that the optical line terminal determines that optical network unit that the sequence number is represented is configured but is sent to after not being activated；Sending module 262, specifically for sending authentication response message to the optical line terminal, the authentication response message includes the certification mark and/or certification password of the optical network unit；Receiving module 261, it is additionally operable to receive the optical network unit marks that the optical line terminal is sent, the optical network unit marks are that the optical line terminal determines that the sequence number of the optical network unit is distributed with the optical network unit that the certification mark of the optical network unit and/or certification password are the sequence number representative after legal.

Further, in embodiment illustrated in fig. 26, receiving module 261, specifically for receiving the authentication request message that the optical line terminal is sent, the authentication request message includes interim optical network unit marks, the authentication request message be the optical line terminal determine the sequence number of the optical network unit do not configure be not activated after be sent to；Sending module 262, specifically for sending authentication response message to the optical line terminal, the authentication response message includes the certification mark and/or certification password of the optical network unit；Receiving module 261, is additionally operable to receive the lower line that the optical line terminal is sent, the lower line is the legal rear transmission of certification mark and/or certification password of the sequence number of optical network unit described in the optical line terminal and the optical network unit；Receive the login request message that the optical line terminal is resend；Sending module 262, is additionally operable to resend the registration reply message to the optical line terminal；Receiving module 261, is additionally operable to receive the optical network unit marks that the optical line terminal is sent.

Further, in embodiment illustrated in fig. 28, receiving module 261 is additionally operable to receive the 3rd distance measurement request message that the optical line terminal is sent；Sending module 262, is additionally operable to send the 3rd ranging response message to the optical line terminal, so that the optical line terminal obtains the 3rd distance measurement result.

Further, in embodiment illustrated in fig. 26, receiving module 261, specifically for receiving the login request message that the optical line terminal is sent in the spectral range or all downstream spectrum scopes or management passage of acquiescence using acquiescence downstream bits carrying table.

Figure 27 be optical network unit embodiment two provided in an embodiment of the present invention structural representation, as shown in figure 27, the optical network unit of the present embodiment on the basis of Figure 26, in addition to：

Frequency spectrum adjustment module 265, information is distributed for receiving the frequency spectrum that the optical line terminal is sent；Spectrum operation scope is adjusted to by target wave band by the electric tunable filter of regulation according to frequency spectrum distribution information. The optical network unit of the present embodiment is used for the technical scheme for performing embodiment of the method shown in Figure 11, and its implementing principle and technical effect is similar, and here is omitted.

Further, in embodiment illustrated in fig. 26, receiving module 261, specifically for receiving the login request message that the optical line terminal is sent in the initial wavelength or public administration wavelength of all downstream wavelengths or acquiescence using acquiescence downstream bits carrying table；Sending module 262, specifically for by adjusting the registration reply message sent after light adjustable transmitter in any upstream wavelength or upstream wavelength corresponding with the downstream wavelength that the reception optical network unit sends login request message using default upstream bit carrying table, the registration reply message includes the sequence number of the optical network unit.

Figure 28 be optical network unit embodiment three provided in an embodiment of the present invention structural representation, as shown in figure 28, the optical network unit of the present embodiment on the basis of Figure 26, in addition to：

Wavelength Assignment module 266, for receiving the Wavelength Assignment information that the optical line terminal is sent, the Wavelength Assignment information is that the optical line terminal is what the optical network unit was distributed；The wavelength of the optical network unit optical sender and photoreceiver is adjusted according to the Wavelength Assignment information.

The optical network unit of the present embodiment is used for the technical scheme for performing embodiment of the method shown in Figure 12, and its implementing principle and technical effect is similar, and here is omitted.

Figure 29 is the structural representation of OFDM-PON system embodiments one provided in an embodiment of the present invention, and as shown in figure 29, the OFDM-PON systems of the present embodiment include：

Optical line terminal 291, at least one optical network unit 292 and Optical Distribution Network 293.The optical line terminal that wherein optical line terminal 291 provides for any embodiment of the present invention, the optical network unit that optical network unit 292 provides for any embodiment of the present invention.

Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations；Although the present invention is described in detail with reference to foregoing embodiments, it will be understood by those within the art that：It can still modify to the technical scheme described in foregoing embodiments, or carry out equivalent substitution to which part or all technical characteristic.Therefore, protection scope of the present invention should be defined by scope of the claims.

Claims

Claims

1st, a kind of orthogonal frequency division multiplexing passive optical network registration activation method, it is characterised in that including：Optical line terminal sends descending training sequence to the optical network unit by certification；

The optical line terminal receives the downstream bits carrying table and up training sequence for the optical network unit that the optical network unit is sent, and the downstream bits carrying table of the optical network unit is that the optical network unit is calculated according to the descending training sequence；

The upstream bits that the optical line terminal calculates the optical network unit according to the up training sequence carry table；

The optical line terminal is calculated according to the downstream bits carrying table of the optical network unit and the upstream bits carrying meter of the optical network unit and updates system descending bit carrying table and system uplink bit carrying table；

The optical line terminal sends system descending bit to the optical network unit and carries table and system uplink bit carrying table, so that the optical network unit updates system descending bit carrying table and system uplink bit carrying table.

2nd, according to the method described in claim 1, it is characterised in that the upstream bits that the optical line terminal calculates the optical network unit according to the up training sequence carry table, including：

The optical line terminal calculates the signal to noise ratio for each uplink sub-carrier for receiving the up training sequence according to the up training sequence；

The upstream bits of optical line terminal optical network unit according to the signal-to-noise ratio computation for each uplink sub-carrier for receiving the up training sequence carry table.

3rd, method according to claim 1 or 2, it is characterized in that, the optical line terminal is calculated according to the downstream bits carrying table of the optical network unit and the upstream bits carrying meter of the optical network unit and updates system descending bit carrying table and system uplink bit carrying table, including：

The less one bit bearing value as the downlink sub-carrier in the bit bearing value of optical line terminal downlink sub-carrier that the downstream bits carrying table of system descending bit carrying table and the optical network unit is identical, to update the system descending bit carrying table；

The less one bit bearing value as the uplink sub-carrier in the bit bearing value of optical line terminal uplink sub-carrier that the upstream bits carrying table of system uplink bit carrying table and the optical network unit is identical, to update the system uplink bit carrying table；Or the upstream bits that the upstream bits of the optical network unit carry table and other optical network units are carried table collectively as institute by the optical line terminal State system uplink bit carrying table.

4th, the method according to any one of claim 13, it is characterized in that, the optical line terminal sends the system descending bit to the optical network unit and carries table and system uplink bit carrying table, so that after the optical network unit renewal system descending bit carrying table and system uplink bit carrying table, in addition to：

The optical line terminal sends the second distance measurement request message to the optical network unit；

The optical line terminal receives the second ranging response message that the optical network unit is sent, to obtain the second distance measurement result.

5th, the method according to any one of claim 14, it is characterised in that the optical line terminal to before sending descending training sequence by the optical network unit of certification, in addition to：

The optical line terminal carries table to optical network unit transmission login request message using acquiescence downstream bits；

The optical line terminal receives the optical network unit and carries the registration reply message that table is sent using default upstream bit, and the registration reply message includes the sequence number of the optical network unit；

The optical line terminal determines that the optical network unit that the optical network unit that the sequence number is represented has been represented by certification and for the sequence number distributes optical network unit marks；

The optical line terminal sends the optical network unit marks to the optical network unit.

6th, a kind of orthogonal frequency division multiplexing passive optical network registration activation method, it is characterised in that including：The descending training sequence that optical line terminal is sent is received by the optical network unit of certification；The downstream bits that the optical network unit calculates the optical network unit according to the descending training sequence carry table；

The downstream bits that the optical network unit sends the optical network unit to the optical line terminal carry table and up training sequence, so that the optical line terminal is calculated according to the upstream bits carrying meter of the upstream bits carrying table of the up training sequence calculating optical network unit and the downstream bits carrying table according to the optical network unit and the optical network unit and updates system descending bit carrying table and system uplink bit carrying table；

The optical network unit receives and updated the system descending bit carrying table and the system uplink bit carrying table that the optical line terminal is sent.

7th, method according to claim 6, it is characterised in that the downstream bits that the optical network unit calculates the optical network unit according to the descending training sequence carry table, including： The optical network unit calculates the signal to noise ratio for each downlink sub-carrier for receiving the descending training sequence according to the descending training sequence；

The downstream bits of optical network unit optical network unit according to the signal-to-noise ratio computation for each downlink sub-carrier for receiving the descending training sequence carry table.

8th, the method according to claim 6 or 7, it is characterised in that the optical network unit is received and updated after the downstream bits carrying table and upstream bits carrying table that the optical line terminal sends, in addition to：

The optical network unit receives the second distance measurement request message that the optical line terminal is sent；The optical network unit sends second of ranging response message to the optical line terminal, so that the optical line terminal obtains the second distance measurement result.

9th, the method according to any one of claim 68, it is characterised in that it is described the descending training sequence that optical line terminal is sent is received by the optical network unit of certification before, in addition to：

The optical network unit receives the login request message that the optical line terminal is sent using acquiescence downstream bits carrying table；

The optical network unit sends registration reply message using default upstream bit carrying table, and the registration reply message includes the sequence number of the optical network unit；

The optical network unit receives the optical network unit marks that the optical line terminal is sent, and the optical network unit marks are that the optical line terminal determines the optical network unit of the sequence number representative by being that the optical network unit that the sequence number is represented is distributed after certification.

10th, a kind of optical line terminal, it is characterised in that including：

Sending module, for sending descending training sequence to the optical network unit by certification；Receiving module, downstream bits carrying table and up training sequence for receiving the optical network unit that the optical network unit is sent, the downstream bits carrying table of the optical network unit is that the optical network unit is calculated according to the descending training sequence；

Computing module, the upstream bits for calculating the optical network unit according to the up training sequence carry table；

Update module, the upstream bits carrying meter for the downstream bits carrying table according to the optical network unit and the optical network unit is calculated and updates system descending bit carrying table and system uplink bit carrying table；

The sending module, is additionally operable to send the system descending bit carrying table to the optical network unit Table is carried with the system uplink bit, so that the optical network unit updates the system descending bit carrying table and system uplink bit carrying table.

11st, optical line terminal according to claim 10, it is characterised in that the computing module, the signal to noise ratio specifically for calculating each uplink sub-carrier for receiving the up training sequence according to the up training sequence；The upstream bits of optical network unit carry table according to the signal-to-noise ratio computation for each uplink sub-carrier for receiving the up training sequence.

12nd, the optical line terminal according to claim 10 or 11, it is characterized in that, the update module, the less one bit bearing value as the downlink sub-carrier in bit bearing value specifically for the system descending bit to be carried to table downlink sub-carrier identical with the downstream bits carrying table of the optical network unit, to update the system descending bit carrying table；The system uplink bit is carried to the less one bit bearing value as the uplink sub-carrier in the bit bearing value of table uplink sub-carrier identical with the upstream bits carrying table of the optical network unit, to update the system uplink bit carrying table；Or the upstream bits that the upstream bits of the optical network unit carry table and other optical network units are carried table collectively as system uplink bit carrying table by the optical line terminal.

13rd, the optical line terminal according to any one of claim 10 12, it is characterised in that the sending module, is additionally operable to send the second distance measurement request message to the optical network unit；

The receiving module, is additionally operable to receive the second ranging response message that the optical network unit is sent, to obtain the second distance measurement result.

14th, the optical line terminal according to any one of claim 10 13, it is characterised in that the sending module, is also used for acquiescence downstream bits carrying table and sends login request message to the optical network unit；

The receiving module, is additionally operable to receive the registration reply message that the optical network unit uses default upstream bit carrying table to send, the registration reply message includes the sequence number of the optical network unit；The optical line terminal also includes：Authentication module, for determining that the optical network unit that the optical network unit that the sequence number is represented has been represented by certification and for the sequence number distributes optical network unit marks；The sending module, is additionally operable to send the optical network unit marks to the optical network unit.

15th, a kind of optical network unit, it is characterised in that including：

Receiving module, the descending training sequence for receiving optical line terminal transmission；

Computing module, the downstream bits for calculating the optical network unit according to the descending training sequence carry table； Sending module, downstream bits for sending from the optical network unit to the optical line terminal carry table and up training sequence, so that the optical line terminal is calculated according to the upstream bits carrying meter of the upstream bits carrying table of the up training sequence calculating optical network unit and the downstream bits carrying table according to the optical network unit and the optical network unit and updates system descending bit carrying table and system uplink bit carrying table；

Update module, for receiving and updating the system descending bit carrying table and the system uplink bit carrying table that the optical line terminal is sent.

16th, optical network unit according to claim 15, it is characterised in that the computing module, the signal to noise ratio specifically for calculating each downlink sub-carrier for receiving the descending training sequence according to the descending training sequence；The downstream bits of optical network unit carry table according to the signal-to-noise ratio computation for each downlink sub-carrier for receiving the descending training sequence.

17th, the optical network unit according to claim 15 or 16, it is characterised in that the receiving module, is additionally operable to receive the second distance measurement request message that the optical line terminal is sent；

The sending module, is additionally operable to send second of ranging response message to the optical line terminal, so that the optical line terminal obtains the second distance measurement result.

18th, the optical network unit according to any one of claim 15 17, it is characterised in that the receiving module, is additionally operable to receive the login request message that the optical line terminal is sent using acquiescence downstream bits carrying table；

The sending module, is also used for default upstream bit carrying table and sends registration reply message, the registration reply message includes the sequence number of the optical network unit；

The receiving module, it is additionally operable to receive the optical network unit marks that the optical line terminal is sent, the optical network unit marks are that the optical line terminal determines the optical network unit of the sequence number representative by being that the optical network unit that the sequence number is represented is distributed after certification.

19th, a kind of orthogonal frequency division multiplexing passive optical network system, it is characterised in that including：

Optical line terminal as described in any one of claim 10 14；

At least one optical network unit as described in any one of claim 15 18；

Optical Distribution Network.