WO2014201607A1

WO2014201607A1 - Optical signal transmission method and device, and optical transmitter

Info

Publication number: WO2014201607A1
Application number: PCT/CN2013/077326
Authority: WO
Inventors: 王轲
Original assignee: 华为技术有限公司
Priority date: 2013-06-17
Filing date: 2013-06-17
Publication date: 2014-12-24
Also published as: CN103782531B; CN103782531A

Abstract

An optical signal transmission method and device, and an optical transmitter. The optical signal transmission method comprises: acquiring a power of a first optical signal correspondingly output by each carrier after a modulator modulates at least one carrier; according to the transmitted amplification gain after combining the first optical signal, which is correspondingly output by at least one carrier, and the wavelength of the carrier, determining a power adjustment coefficient of a corresponding first optical signal; and according to the power adjustment coefficient of the first optical signal, adjusting the power of the corresponding first optical signal in a modulator. The optical signal transmission method and device, and the optical transmitter can adjust the power of each carrier according to the amplification gain of an optical signal and the wavelength of a carrier in a transmission link, so as to adaptively guarantee the smoothness of the gain of the optical signal in the transmission link; and the use of a pump laser or an optical amplifier and the like in an optical signal transmission system can be reduced and even avoided, reducing the OSNR cost of an optical signal transmission process.

Description

The present invention relates to communication technologies, and in particular, to an optical signal transmission method, apparatus, and optical transmitter. Background technique

With the increasing demand for data transmission systems for data communication, the industry's research on ultra-100G transmission systems has become increasingly hot, and many well-known enterprises have released prototypes of 400Gb/s and ITb/s transmission rates. It can be seen from these prototypes that the future development trend of optical communication systems is based on multi-carrier and high-order modulation optical transmitters.

In the prior art, an optical transmitter of a transmission system above 100 G uses photonic integration technology to integrate a laser array and a modulator array. When using multi-carrier generation technology, the demultiplexing device Demux is used to demultiplex the carrier into multiple independent wavelength optical signals for modulation. The output of the modulator is coupled by the wavelength division multiplexer Mux to obtain a light. The signal is transmitted through the fiber. In the transmission link, an optical amplifier is required to amplify the optical signal at a certain distance. The cascade connection of multiple optical amplifiers causes the optical signal gain to be uneven. Pump lasers or Raman amplifiers are currently used to balance the loss of optical signals in the transmission link.

However, in the prior art, in the case where the wavelength of the optical signal changes, in order to obtain an optical communication link with a flat gain, it is necessary to readjust the deployment scheme of the pump laser to keep the gain of the optical signal in the transmission link flat. Summary of the invention

Embodiments of the present invention provide an optical signal transmission method, apparatus, and optical transmitter to adaptively ensure flatness of optical signal gain in a transmission link.

In a first aspect, an embodiment of the present invention provides an optical signal transmission method, including:

Obtaining, by the modulator, the power of the first optical signal corresponding to each carrier after modulating the at least one carrier; the amplification gain transmitted by the first optical signal corresponding to the output of the at least one carrier after combining and the wavelength of the carrier, Determining a corresponding power adjustment coefficient of the first optical signal; Determining a power adjustment coefficient of the first optical signal, and adjusting a power of the corresponding first optical signal in the modulator.

In a first implementation manner of the first aspect, the first optical signal outputted according to the at least one carrier is combined with an amplification gain transmitted after combining and a wavelength of the carrier, and the corresponding first light is determined. The power adjustment factor of the signal, including:

Obtaining a gain value corresponding to a wavelength of each of the carriers according to the amplification gain;

Determining a gain average value of the at least one carrier according to a gain value corresponding to a wavelength of each of the carriers;

Determining a power adjustment coefficient of the first optical signal = where: I is first

An initial adjustment coefficient of the optical signal is a gain value corresponding to a wavelength of each of the carriers, and G is a gain average of the at least one carrier.

In a second implementation manner of the first aspect, the first optical signal corresponding to the output of the at least one carrier is combined with an amplification gain transmitted after the combining and a wavelength of the carrier, and the corresponding first light is determined. After the power adjustment factor of the signal, it also includes:

The power adjustment coefficient of the corresponding first optical signal is updated according to a modulation pattern and a modulation order corresponding to each carrier before modulation.

In a third implementation manner of the first aspect, the updating the power adjustment coefficient of the corresponding first optical signal according to the modulation pattern and the modulation order corresponding to each carrier before the modulation includes:

Obtaining a transmit power corresponding to each of the carriers according to a preset error rate in the high-order quadrature amplitude modulation and a modulation order of the carrier, and acquiring an average transmit power of the at least one carrier; The power adjustment coefficients of the signals are multiplied, and the power adjustment coefficients of the corresponding first optical signals are updated.

In a fourth implementation manner of the first aspect, the preset error rate according to the high-order orthogonal amplitude modulation and the transmit power corresponding to the carrier, including: acquiring each of the carriers according to SE? Corresponding launch

a power year P, where BER is a preset error rate in the high-order quadrature amplitude modulation, and M _w is the The modulation order of the carrier, er/c^ ^ J ' t , N. For the spectral density of Gaussian white noise, R _sN is the symbol rate of the carrier.

In a fifth implementation manner of the first aspect, the first optical signal outputted according to the at least one carrier is combined with an amplification gain transmitted after combining and a wavelength of the carrier, and the corresponding first light is determined. After the power adjustment factor of the signal, it also includes:

Obtaining the power of each of the carriers before modulation;

The power adjustment coefficient of the corresponding first optical signal is updated according to the power of each of the carriers before modulation, the power of the corresponding first signal, and the frequency of the at least one carrier.

In a sixth implementation manner of the first aspect, if the number of the carriers is greater than or equal to four, the power of each of the carriers before the modulation, the power of the corresponding first signal, and the The frequency of the at least one carrier is updated, and the power adjustment coefficient of the corresponding first optical signal is updated, including:

Judging ^ = + _Λ, where ^, f /· and / are respectively the frequencies of the any four carriers;

The nonlinear correction coefficient of the carrier corresponding to f _ijk F = I - ; f or the nonlinear correction coefficient of the corresponding carrier F = / + ^ ^ ; where I is the initial adjustment coefficient of the first optical signal, P1 is the first The power of the signal, P2 is the power of each of the carriers before modulation;

And multiplying a nonlinear correction coefficient corresponding to each of the carriers by a power adjustment coefficient of the corresponding first optical signal to update a power adjustment coefficient of the corresponding first optical signal.

In a second aspect, an embodiment of the present invention provides an optical signal transmission apparatus, including:

a detection module, configured to obtain a power of a first optical signal that is output by each of the carriers after the modulation of the at least one carrier by the modulator; and an adjustment module, configured to: after the first optical signal corresponding to the output of the at least one carrier is combined Amplifying gain of the transmission and a wavelength of the carrier, determining a power adjustment coefficient of the corresponding first optical signal; and corresponding to the first optical signal in the modulator according to a power adjustment coefficient of the first optical signal The power is adjusted.

In a first implementation manner of the second aspect, the adjusting module is specifically configured to:

Determining a gain average value of the at least one carrier according to a gain value corresponding to a wavelength of each of the carriers; Determining a power adjustment coefficient of the first optical signal = / x, where: I is first

An initial adjustment coefficient of the optical signal, (^ is a gain value corresponding to a wavelength of each of the carriers, and G is a gain average of the at least one carrier.

In a second implementation manner of the second aspect, the adjusting module is further configured to:

In a third implementation manner of the second aspect, the adjusting module is specifically configured to:

The second square module is specifically configured to: acquire, according to SE?, a corresponding transmission of each of the carriers

The power year P _sN , where BER is a preset error rate in the high-order quadrature amplitude modulation, and M _w is a modulation order of the carrier, erfc^ ^^ dt , N . For the spectral density of Gaussian white noise, R _sN is the symbol rate of the carrier.

In a fifth embodiment of the second aspect, characterized in that

The detection module is further configured to:

Obtaining power of each of the carriers before modulation; correspondingly,

The adjustment module is further configured to:

And updating a power adjustment coefficient of the corresponding first optical signal according to the power of the second signal, the power of the corresponding first signal, and the frequency of the at least one carrier.

In a fifth implementation manner of the second aspect, if the number of the carriers is greater than or equal to four, the adjusting module is further configured to:

Judging ^ =^ + _ , where Λ*, f /·, and Λ are the frequencies of the arbitrary four carriers, respectively;

The nonlinear correction edge of the carrier corresponding to f _ijk F = I - ; The nonlinear correction coefficient F = / + ^ of the carrier corresponding to j\, or /; where I is the initial adjustment coefficient of the first optical signal, P1 is the power of the first signal, and P2 is the carrier before the modulation Power

In a third aspect, an embodiment of the present invention provides an optical transmitter, including:

a splitter, a combiner, and a modulator; the modulator is configured to: after modulating at least one carrier, each carrier correspondingly outputs a first optical signal; acquiring power of the first optical signal; according to the at least one carrier Corresponding to the power gain adjustment coefficient of the corresponding first optical signal, corresponding to the power gain adjustment coefficient of the first optical signal, corresponding to the power gain adjustment coefficient of the first optical signal The power of the first optical signal is adjusted.

In a first implementation manner of the third aspect, the modulator is specifically configured to:

Determining a power adjustment coefficient of the first optical signal = / xi / wherein: I is the first

An initial adjustment coefficient of the optical signal is a gain value corresponding to a wavelength of each of the carriers, and G is a gain average of the at least one carrier. In a second implementation of the third aspect, the modulator is further configured to:

The power adjustment coefficient of the corresponding first optical signal is updated according to a modulation pattern and a modulation order corresponding to each carrier before the adjustment.

In a third implementation manner of the third aspect, the modulator is specifically configured to:

In a fourth implementation manner of the third aspect, the modulator is specifically configured to: Acquiring the transmission corresponding to each of the carriers according to SE ?

Power ^, where BER is a preset error rate in the high-order quadrature amplitude modulation, and M _w is a modulation order of the carrier, erfc^^^dt, N. For the spectral density of Gaussian white noise, R _sN is the symbol rate of the carrier.

In a fifth implementation manner of the third aspect, the modulator is further configured to:

Obtaining the power of each of the carriers before modulation;

In a sixth implementation manner of the third aspect, if the number of the carriers is greater than or equal to four, the modulator is further configured to:

Judging ^ =^ + _ , where · , f /;· and Λ are the frequencies of the arbitrary four carriers respectively;

The nonlinear correction edge of the carrier corresponding to f _ijk F = I - ; f or the nonlinear correction coefficient of the corresponding carrier F = / + ^^ ; where I is the initial adjustment coefficient of the first optical signal, P1 is the first The power of the signal, P2 is the power of each of the carriers before modulation;

The optical signal transmission method, device and optical transmitter provided by the embodiments of the present invention adjust the power of each carrier optical signal outputted by the modulation in the modulator according to the amplification gain of the optical signal in the transmission link and the carrier wavelength, thereby The gain of the optical signal in the transmission link is adaptively ensured; the use of the pump laser or the optical amplifier in the optical signal transmission system can be reduced or even avoided, and the OSNR cost in the optical signal transmission process is reduced. BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below, and obviously, in the following description The drawings are some embodiments of the invention, and to those of ordinary skill in the art, Other drawings may also be obtained from these drawings without the inventive labor.

FIG. 1 is a flowchart of an optical signal transmission method according to an embodiment of the present invention;

2 is a flowchart of another optical signal transmission method according to an embodiment of the present invention;

3 is a flowchart of still another optical signal transmission method according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of an optical signal transmission apparatus according to an embodiment of the present invention; FIG. 5 is a schematic structural diagram of an optical transmitter according to an embodiment of the present invention. The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. The embodiments are a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

FIG. 1 is a flowchart of an optical signal transmission method according to an embodiment of the present invention. As shown in FIG. 1 , an optical signal transmission apparatus provided by an optical signal transmission apparatus is used as an execution body to describe an optical signal transmission method provided by the embodiment. It is an optical transmitter. The optical signal transmission method of this embodiment may include:

S110. Obtain a power of each of the carriers corresponding to the output of the first optical signal after the modulator acquires the at least one carrier.

The optical transmitter uses a multi-carrier technique to decompose the carrier to obtain at least one carrier. After the at least one carrier is input to the modulator, each carrier is modulated to obtain a first optical signal. The optical signal transmission device can detect the power of the first optical signal of the modulator in a feedback manner.

S120. Determine, according to the amplification gain of the combined first optical signal corresponding to the at least one carrier and the wavelength of the carrier, determine a power adjustment coefficient of the corresponding first optical signal.

It should be noted that if the number of carriers is one, the carrier itself is still output after the combination. At least one carrier is coupled by a wavelength division multiplexer Mux to form a carrier, and the carrier that is recoupled into the carrier will be transmitted through the fiber link. In this step, the optical signal transmission device can obtain the amplification gain of the coupled carrier in the fiber link, and the respective wavelengths of the carriers before coupling. Thereby, the power adjustment coefficient of the first optical signal carried by each carrier is determined according to the amplification gain and the wavelength of each carrier.

S130. Adjust, according to a power adjustment coefficient of the first optical signal, a power of the corresponding first optical signal in the modulator. After adjusting the power of the first optical signal in the modulator, the power of the first optical signal output by the modulator can be changed to adaptively ensure the flatness of the gain of the optical signal in the transmission link.

The optical signal transmission method provided in this embodiment adjusts the power of the optical signals of the modulated signals output in the modulator according to the amplification gain of the optical signal in the transmission link and the carrier wavelength, thereby adaptively ensuring the transmission chain. The gain of the optical signal in the road is flat; the use of the pump laser or optical amplifier in the optical signal transmission system can be reduced or even avoided, and the optical signal to noise ratio (hereinafter referred to as Optical Signal To Noise Ratio) is reduced. OSNR) cost.

Further, determining, according to the amplification gain of the first optical signal corresponding to the at least one carrier, and the wavelength of the carrier, determining a power adjustment coefficient of the corresponding first optical signal, including: acquiring each carrier according to the amplification gain a gain value corresponding to the wavelength; determining a gain average value of the at least one carrier according to the gain value corresponding to the wavelength of each carrier (if the number of carriers is one, the gain average is the gain value corresponding to the carrier wavelength); Determining the power adjustment factor of the first optical signal

Α = Ι χ , where: I is the initial adjustment factor of the first optical signal, for each carrier

The gain value corresponding to the wavelength, and G is the gain average of at least one carrier.

Specifically, the gain curve in the transmission link can be measured by multi-wave source and spectrum. If a commercial optical amplifier is used in the transmission link, the parameters such as the gain curve of the optical amplifier at the factory are usually listed in the user manual. . Assuming that four carriers are modulated in the optical transmitter, the optical transmitter can find the gain values corresponding to the respective wavelengths from the gain curves according to the respective wavelengths of the four carriers, and the gain values corresponding to the four carriers are respectively G ₂ . (3⁄4 and <3⁄4. The average gain of the four carriers is G = ^G ^ ^{G +} G _{i +} G _A. Then the first optical signal corresponding to the first of the four carriers

4 where I is the initial adjustment factor of the first optical signal,

The gain average value set to the four carriers may also be set as the average of the transmission powers of the four carriers. The initial adjustment coefficient is used to adjust the power of the first optical signal, or 1=1 as needed. The method for acquiring the power adjustment coefficient of the first optical signal corresponding to the other carriers is similar. 2 is a flowchart of another optical signal transmission method according to an embodiment of the present invention. As shown in FIG. 2, an optical signal transmission method provided by the embodiment is described by using an optical signal transmission apparatus as an execution body, and an optical signal transmission apparatus is provided. It can be an optical transmitter. The optical signal transmission method of this embodiment may be further included on the basis of S110 to S130 of the embodiment shown in FIG.

S240. Update a power adjustment coefficient of the corresponding first optical signal according to a modulation pattern and a modulation order corresponding to each carrier before the modulation.

For example, a high-order Quadrature Amplitude Modulation (QAM) modulation pattern is used to modulate each carrier before modulation, and the modulation order is Μ. Then, the power adjustment coefficients of the first optical signals of the respective carriers can be updated according to the characteristics of the modulation pattern and the modulation order 对应 corresponding to each carrier.

Further, updating the power adjustment coefficient of the corresponding first optical signal according to a modulation pattern and a modulation order corresponding to each carrier before the modulation, including: according to a preset error rate in the high-order quadrature amplitude modulation and The modulation order of the carrier acquires the transmit power corresponding to each carrier, and obtains the average transmit power of at least one carrier (if the number of carriers is one, the average transmit power is the transmit power of the carrier itself); The ratio of the corresponding transmit power to the average transmit power of the carriers is multiplied by the power adjustment coefficient of the corresponding first optical signal, and the power adjustment coefficient of the corresponding first optical signal is updated.

Specifically, the modulation pre-modulation carrier is modulated by using a modulation pattern of mQAM (m-order quadrature amplitude modulation), and when a single carrier needs to reach a predetermined error rate, the modulation order of the carrier is used. M and its transmit power need to meet certain requirements. Under the known bit error rate and modulation order M, the transmit power P _{sjV of} the carrier can be known. Still, the four carriers are not modulated, and the transmission powers of the four carriers, P _s2 , and P _s4 are respectively obtained, and then the power modulation coefficients of the first optical signals corresponding to the first carrier of the four carriers can be updated to:

P. ,

The method for updating the power adjustment coefficient of the first optical signal corresponding to the other carriers is similar, and the power adjustment coefficient of the corresponding first optical signal can be updated to:

A = I x , where is the average transmit power of at least two carriers,

Further, according to the preset error rate in the high-order quadrature amplitude modulation and the modulation order of the carrier, Obtaining the transmit power corresponding to each carrier, including:

BER , obtaining the transmit power corresponding to each carrier ^,

Medium, BER is the preset error rate in high-order quadrature amplitude modulation, and M _w is the modulation order of the carrier, erfc(z), N. The spectral density of Gaussian white noise is the symbol rate of the carrier.

In the case of mCUAM modulation, the bit error rate BER, the modulation order M _{N ,} and the carrier corresponding

The relationship between the transmit power ^ is specifically: BER «

The optical signal transmission method provided in this embodiment adjusts the power of the optical signals of the modulated signals output in the modulator according to the amplification gain of the optical signal in the transmission link and the carrier wavelength, thereby adaptively ensuring the transmission chain. The gain of the optical signal in the road is flat; the power between the carriers is also equalized according to the modulation pattern of each carrier; the use of the pump laser or optical amplifier in the optical signal transmission system can be reduced or even avoided, and the optical signal is reduced OSNR penalty during transmission. FIG. 3 is a flowchart of still another method for transmitting an optical signal according to an embodiment of the present invention. As shown in FIG. 3, an optical signal transmission method provided by the embodiment is described by using an optical signal transmission apparatus as an execution body, and an optical signal transmission apparatus is provided. It can be an optical transmitter. The optical signal transmission method of the present embodiment may further include: S110 to S130 of the embodiment shown in FIG. 1, or S110 to S240 of the embodiment shown in FIG. 2, which may further include:

S350. Acquire power of each carrier before modulation; and update a power adjustment coefficient of the corresponding first optical signal according to power of each carrier before modulation, power of the corresponding first signal, and frequency of at least one carrier.

Further, if the number of carriers is greater than or equal to four, the power adjustment coefficient of the corresponding first optical signal is updated according to the power of each carrier before modulation, the power of the corresponding first signal, and the frequency of at least one carrier. , including: judging ^ =^ +/ -A , where Λ*, f and respectively are the frequencies of any four carriers; then: ^ the nonlinear correction coefficient of the corresponding carrier F = / -^^ ; f or the nonlinear correction coefficient F of the corresponding carrier, where I is the first optical signal

The initial adjustment coefficient, P1 is the power of the first signal, and P2 is the power of each carrier before the modulation; the nonlinear correction coefficient corresponding to each carrier is multiplied by the power adjustment coefficient of the corresponding first optical signal, corresponding to The power adjustment coefficient of the first optical signal is updated.

In detail, considering the influence of the nonlinear effect of the system, such as the influence of the four-wave mixing effect, the optical transmitter can first determine whether the frequency of any four carriers in the multi-carrier satisfies f _ijk = f _{i +} f _k . When the frequencies of a certain four carriers satisfy the above relationship, the carriers whose frequencies are respectively f and are transmitted to the carrier whose frequency is ^. The power transferred by the carriers of frequencies ^, f, and ^, respectively, is quantized, that is: ^ The nonlinear correction coefficient of the corresponding carrier

_{F = I} _ P2_ P}_ . _f or the nonlinear correction factor of the corresponding carrier ^ + ^^. Then, the power modulation factor of the first optical signal corresponding to the carrier can be updated to:

\G, - G\

Α = Ι χ I F , or

G

The optical signal transmission method provided in this embodiment adjusts the power of the optical signals of the modulated signals output in the modulator according to the amplification gain of the optical signal in the transmission link and the carrier wavelength, thereby adaptively ensuring the transmission chain. The gain of the optical signal in the path is flat; and the power between the carriers is equalized according to the modulation pattern of each carrier; and the power of the optical signal of each carrier output after modulation is further performed in the adjuster according to the frequency of each carrier. Adjustment, to reduce the impact of nonlinear effects on optical signal transmission; can reduce or even avoid the use of pump lasers or optical amplifiers in optical signal transmission systems, reducing the OSNR cost of optical signal transmission.

The optical signal transmission method provided by the embodiment of the present invention does not need to re-plan the optical signal transmission system, when the modulation mode of the optical transmitter, the number of carriers, the optical amplifier in the transmission link, and the wavelength of the carrier are changed. The power of the optical signal transmitted by the optical transmitter can be adaptively adjusted.

In the optical signal transmission method provided in the above embodiment, the power adjustment coefficient of the first optical signal Get and update, you can use matrix operations. For example, still modulate four carriers as an example:

Step 1: Determine an initial adjustment coefficient matrix of the first optical signal I=[I, I, I, I] _;

Step 2: Determine a first power adjustment coefficient matrix of the first optical signal:

Where 4v = -^^, the gain value corresponding to the wavelength of each carrier, G is the increase of four carriers

G

Benefit average.

Step 3: Determine a first power adjustment coefficient update matrix of the first optical signal: p p p p

, where Ρ, Ρ _{2 ,} and ^ are the transmit powers of the four carriers, respectively.

P _s P _s P _s P _s

P _s is the average transmit power of four carriers, ie P _s = (P _sl + P _s2 + P _s3 + P _s4 ) / 4 _a . Step 4: If four carriers satisfy / ₄ = / _{1 +} / ₂ - / ₃ , wherein /;, / ₂ , / _3, and / ₄ are respectively the frequencies of the four carriers; then determining a second power adjustment coefficient update matrix of the first optical signal:

, PI is the power of the first signal,

P2 is the power of the pre-modulation carrier.

Step 5: The power adjustment coefficient matrix for adjusting the power of the first optical signal corresponding to the four carriers may be a product of a matrix I and 4v, or a product of a matrix I, 4v and three, or The product of the matrix I, 4v, ^ and the three is used. The power of the first optical signal of the four carriers is adjusted by multiplying the power adjustment coefficient matrix by the power matrix of the first optical signal of four carriers: [ ^, ^ ₂ , 3⁄4, 3⁄4]. The implementation of the present invention can be applied to a Wavelength Division Multiplexing (WDM) high-speed transmission system of over 100G. In the prior art, in order to equalize the optical power of each channel, an adjustable attenuator is used to adjust the power of the optical signals of each channel before entering the wavelength division multiplexer according to the feedback signal. The feedback signal is usually obtained based on the signal to noise ratio of the channel. The channel optical power with higher signal to noise ratio is reduced, and the optical power of the channel with lower signal to noise is improved. However, in the super-100G WDM high-speed transmission system, the power budget is relatively tight. For example, the power requirement of the optical signal entering the optical modulator is above 10 dBm, and the optical signal power entering the transmission link from the optical modulator needs to be Above 3dBm, if adding an adjustable attenuator in the system will reduce the optical power of the modulator output optical signal, the optical power entering the link will be difficult to reach more than 3dBm. In this scenario, by applying the embodiment of the present invention, the optical power of the optical signals of each carrier output after modulation is pre-emphasized in the modulator, thereby ensuring that the total optical power of the optical signal in a single optical fiber is not For example, the total power of the carrier before modulation is 6 dBm, and the total power of the optical signal is still kept 6 dBm after modulation. Therefore, in the implementation process of the embodiment of the present invention, the optical power in each channel may be preset, thereby achieving equalization of optical power in the WDM system. There is no need to add devices such as adjustable attenuators to WDM high-speed transmission systems. FIG. 4 is a schematic structural diagram of an optical signal transmission apparatus according to an embodiment of the present invention. As shown in FIG. 4, the optical signal transmission apparatus 400 provided in this embodiment may include:

The detecting module 410 is configured to obtain power of the first optical signal corresponding to each carrier after the modulator modulates the at least one carrier.

The adjusting module 420 is configured to determine, according to the amplification gain of the first optical signal corresponding to the output of the at least one carrier, and the wavelength of the carrier, determine a power adjustment coefficient of the corresponding first optical signal, and adjust the power according to the power of the first optical signal. Coefficient, the power of the corresponding first optical signal is adjusted in the modulator.

The optical signal transmission device 400 provided in this embodiment may be used to perform the technical solution of the method embodiment shown in any one of FIG. 1 to FIG. 3, and the implementation principle and technical effects are similar, and details are not described herein again.

Further, the adjusting module 420 is specifically configured to: obtain a gain value corresponding to a wavelength of each carrier according to the amplification gain; determine a gain average value of the at least one carrier according to the gain value corresponding to the wavelength of each carrier; wherein:

The initial adjustment coefficient of the first optical signal is a gain value corresponding to the wavelength of each carrier, and G is a gain average of at least one carrier. Further, the adjusting module 420 is further configured to: update a power adjustment coefficient of the corresponding first optical signal according to a modulation pattern and a modulation order corresponding to each carrier before the modulation.

Further, the adjusting module 420 is specifically configured to: obtain a transmit power corresponding to each carrier according to a preset error rate in the high-order quadrature amplitude modulation and a modulation order of the carrier, and acquire an average transmit power of the at least one carrier; Using the ratio of the corresponding transmit power to the average transmit power of each carrier The power adjustment coefficients of the corresponding first optical signals are multiplied, and the power adjustment coefficients of the corresponding first optical signals are updated.

Further, the adjustment module 420 is used for:

BER , obtaining the transmit power corresponding to each carrier ^,

Further, the detecting module 410 is further configured to: obtain power of each carrier before the modulation; correspondingly, the adjusting module 420 is further configured to: according to the power of the second signal, the power of the corresponding first signal, and the frequency of the at least one carrier, The power adjustment coefficient of the corresponding first optical signal is updated.

Further, if the number of carriers is greater than or equal to four, the adjustment module 420 is further configured to: determine = ff "f _k , where Λ *, f, and Λ are respectively frequencies of any four carriers; then: f _yk corresponds to The nonlinear correction coefficient of the carrier F = / -^^ ; f . or the nonlinear correction coefficient of the carrier corresponding to F = / + ^ ^ ; where I is the initial adjustment coefficient of the first optical signal, PI is the first signal p \

The power is the power of each of the carriers before modulation; multiplying the nonlinear correction coefficient corresponding to each carrier by the power adjustment coefficient of the corresponding first optical signal, and performing power adjustment coefficients of the corresponding first optical signal Update. The optical signal transmission device 400 provided in this embodiment may be used to implement the technical solution of the foregoing method embodiments, and the implementation principle and technical effects thereof are similar, and details are not described herein again.

FIG. 5 is a schematic structural diagram of an optical transmitter according to an embodiment of the present invention. As shown in FIG. 5, the optical transmitter 500 provided in this embodiment may include:

Splitter 510, combiner 520, and modulator 530. The splitter 510 may be, for example, a demultiplexing multiplexer Demux, and the combiner 520 may be, for example, a wavelength division multiplexer Mux.

The modulator 530 is configured to: after modulating the at least one carrier, each carrier correspondingly outputs the first optical signal; acquiring power of the first optical signal; and obtaining, by the at least one carrier, the amplification gain of the first optical signal after being combined And the wavelength of the carrier, determining the power adjustment system of the corresponding first optical signal The power of the corresponding first optical signal is adjusted according to the power adjustment coefficient of the first optical signal. The optical transmitter 500 provided in this embodiment may be used to implement the technical solution of the method embodiment shown in any one of FIG. 1 to FIG. 3, and the implementation principle and technical effects are similar, and details are not described herein again.

Further, the modulator 530 is specifically configured to: obtain a gain value corresponding to a wavelength of each carrier according to the amplification gain; determine a gain average value of the at least one carrier according to the gain value corresponding to the wavelength of each carrier; and determine the first optical signal Power adjustment factor where: I is the first

The initial adjustment coefficient of an optical signal is a gain value corresponding to the wavelength of each carrier, and G is a gain average of at least one carrier. Further, the modulator 530 is further configured to: update the power adjustment coefficient of the corresponding first optical signal according to a modulation pattern and a modulation order corresponding to each carrier before the adjustment.

Further, the modulator 530 is specifically configured to: obtain a transmit power corresponding to each carrier according to a preset error rate in the high-order quadrature amplitude modulation and a modulation order of the carrier, and acquire an average transmit power of the at least one carrier; The ratio of the corresponding transmit power to the average transmit power of each carrier is multiplied by the power adjustment coefficient of the corresponding first optical signal, and the power adjustment coefficient of the corresponding first optical signal is updated.

Further, the modulator 530 is specifically adapted to:

BER, its

Further, the modulator 530 is further configured to: acquire power of each carrier before modulation; and adjust power of the corresponding first optical signal according to power of the second signal, power of the corresponding first signal, and frequency of the at least one carrier The coefficients are updated.

Further, if the number of carriers is greater than or equal to four, the modulator 530 is further configured to: determine = f^ f "f _k , where Λ*, f /·, and Λ are frequencies of any four carriers, respectively; The nonlinear correction coefficient of the carrier corresponding to f _yk F = / -^^ ; the non-linear repair of the corresponding carrier of j\, /. or / Positive coefficient F where I is the initial adjustment coefficient of the first optical signal, and P1 is the first signal

The power is the power of each of the carriers before modulation; multiplying the nonlinear correction coefficient corresponding to each carrier by the power adjustment coefficient of the corresponding first optical signal, and performing power adjustment coefficients of the corresponding first optical signal Update. The optical transmitter 500 provided in this embodiment may be used to implement the technical solution of the method embodiment shown in any one of FIG. 1 to FIG. 3, and the implementation principle and technical effects are similar, and details are not described herein again.

In summary, the optical signal transmission method, apparatus, and optical transmitter provided by the embodiments of the present invention adjust the power of each carrier according to the amplification gain of the optical signal in the transmission link and the carrier wavelength, thereby adaptively ensuring transmission. The gain of the optical signal in the link is flat; and the power between the carriers is equalized according to the modulation pattern of each carrier; and the power of the first optical signal is further adjusted according to the frequency of each carrier to reduce the nonlinear effect pair The effect of optical signal transmission; can reduce or even avoid the use of pump lasers or optical amplifiers in optical signal transmission systems, reducing the OSNR cost in optical signal transmission.

A person skilled in the art can understand that all or part of the steps of implementing the above method embodiments may be completed by using hardware related to program instructions, and the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed. The foregoing storage medium includes: ROM, RAM, magnetic disk or optical disk, etc., which can store various program codes. Finally, the above embodiments are only used to illustrate the technology of the present invention. The invention is not limited thereto; although the invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions described in the foregoing embodiments may still be modified, or Some or all of the technical features are equivalently substituted; and the modifications or substitutions do not depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

Claim

An optical signal transmission method, comprising:

Obtaining, by the modulator, the power of the first optical signal outputted by each carrier after modulating the at least one carrier;

Determining, according to the amplification gain of the first optical signal corresponding to the output of the at least one carrier, and the wavelength of the carrier, determining a power adjustment coefficient of the corresponding first optical signal;

The power of the corresponding first optical signal is adjusted in the modulator based on the power adjustment factor of the first optical signal.

The method according to claim 1, wherein the first optical signal corresponding to the output of the at least one carrier is combined with an amplification gain transmitted after the combining and a wavelength of the carrier, and the corresponding The power adjustment coefficient of the first optical signal includes:

Determining a power adjustment coefficient of the first optical signal, wherein: I is first

The method according to claim 1 or 2, wherein the first optical signal corresponding to the output of the at least one carrier is combined with an amplification gain transmitted after the combining and a wavelength of the carrier, and the corresponding After the power adjustment coefficient of the first optical signal, the method further includes:

The method according to claim 3, wherein the updating the power adjustment coefficient of the first optical signal according to a modulation pattern and a modulation order corresponding to each carrier before the modulation, including :

The method according to claim 4, wherein the acquiring a transmit power corresponding to each carrier according to a preset error rate in the high-order quadrature amplitude modulation and a modulation order of the carrier , including: obtaining, according to SEW, a transmission corresponding to each of the carriers

a power year P _sN , where BER is a preset error rate in the high-order quadrature amplitude modulation, and M _w is a modulation order of the carrier, erf ^ ^^dt , N. For the spectral density of Gaussian white noise, R _sN is the symbol rate of the carrier.

The method according to any one of claims 1 to 5, wherein the amplification gain of the first optical signal correspondingly outputted according to the at least one carrier is combined and the wavelength of the carrier After determining the power adjustment coefficient of the corresponding first optical signal, the method further includes:

Obtaining the power of each of the carriers before modulation;

The method according to claim 6, wherein if the number of the carriers is greater than or equal to four, the power of each of the carriers before the modulation, corresponding to the first signal The power and the frequency of the at least one carrier are updated, and the power adjustment coefficient of the corresponding first optical signal is updated, including:

Judging ^ = + _ , where Λ*, f /·, and Λ are the frequencies of the arbitrary four carriers, respectively;

The nonlinear correction margin of the carrier corresponding to f _ijk F = I - ; j], or the nonlinear correction coefficient of the corresponding carrier F = / + ^^ ; where I is the initial adjustment coefficient of the first optical signal, P1 is Describe the power of the first signal, P2 is the power of each of the carriers before modulation;

8. An optical signal transmission apparatus, comprising:

a detecting module, configured to acquire a power of a first optical signal corresponding to each carrier after the modulator modulates the at least one carrier;

An adjusting module, configured to: after the first optical signal corresponding to the output according to the at least one carrier is combined Amplifying gain of the transmission and a wavelength of the carrier, determining a power adjustment coefficient of the corresponding first optical signal; and corresponding to the first optical signal in the modulator according to a power adjustment coefficient of the first optical signal The power is adjusted.

The apparatus according to claim 8, wherein the adjusting module is specifically configured to: acquire, according to the amplification gain, a gain value corresponding to a wavelength of each of the carriers;

10. The apparatus according to claim 8 or 9, wherein the adjustment module is further configured to:

The device according to claim 10, wherein the adjusting module is specifically configured to: acquire each according to a preset error rate in the high-order quadrature amplitude modulation and a modulation order of the carrier Transmitting power corresponding to the carrier, and acquiring an average transmit power of the at least one carrier; multiplying a power adjustment coefficient of the first optical signal to update a power adjustment coefficient of the corresponding first optical signal.

12. According to the adjustment module, the module is specifically configured to: transmit according to the carrier of the layer.

In order power modulation P _sN, wherein, BER is a high order quadrature amplitude modulation of the preset bit error rate, M _w is the _{carrier, β φ (ζ, = ^} ] β -Ί N. was The spectral density of Gaussian white noise, R _sN is the symbol rate of the carrier.

13. Apparatus according to any one of claims 8 to 12, characterized in that

The detection module is further configured to:

Obtaining power of each of the carriers before modulation; correspondingly,

The adjustment module is further configured to: And updating a power adjustment coefficient of the corresponding first optical signal according to the power of the second signal, the power of the corresponding first signal, and the frequency of the at least one carrier.

The device according to claim 13, wherein if the number of the carriers is greater than or equal to four, the adjusting module is further configured to:

Judging ^ = +/ _ , where f / and Λ are the frequencies of the arbitrary four carriers, respectively;

15. An optical transmitter, comprising:

Splitter, combiner and modulator;

The modulator is configured to: after modulating at least one carrier, each carrier correspondingly outputs a first optical signal; acquiring power of the first optical signal; and combining, according to the at least one carrier, the output of the first optical signal Determining a power adjustment coefficient of the corresponding first optical signal, and adjusting a power of the corresponding first optical signal according to a power adjustment coefficient of the first optical signal; and adjusting a power of the corresponding first optical signal according to a power adjustment coefficient of the first optical signal.

16. The optical transmitter of claim 15, wherein the modulator is specifically for:

The optical transmitter according to claim 15 or 16, wherein the modulator is further configured to: And updating a power adjustment coefficient of the corresponding first optical signal according to a modulation pattern and a modulation order corresponding to each carrier before the adjustment.

18. The optical transmitter of claim 17, wherein the modulator is specifically for:

19. The modulator is specifically configured to: acquire, according to the SEW, a transmission corresponding to each of the carriers

a power year P _sN , where BER is a preset error rate in the high-order quadrature amplitude modulation, and M _w is a modulation order of the carrier, erfciz) : ^]^ , N. For the spectral density of Gaussian white noise, R _sN is the symbol rate of the carrier.

The optical transmitter according to any one of claims 15 to 19, wherein the modulator is further configured to:

Obtaining the power of each of the carriers before modulation;

The optical transmitter according to claim 20, wherein if the number of the carriers is greater than or equal to four, the modulator is further configured to:

The nonlinear correction margin of the carrier corresponding to f _ijk F = I - ; f or the nonlinear correction coefficient of the corresponding carrier = / + ^^ ; where I is the initial adjustment coefficient of the first optical signal, and P1 is the first signal Power, P2 is the power of each of the carriers before modulation;