CN100568815C - A kind of system for transmitting single-fiber-optic two-way wavelength division multiplexing and guard method thereof - Google Patents
A kind of system for transmitting single-fiber-optic two-way wavelength division multiplexing and guard method thereof Download PDFInfo
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- CN100568815C CN100568815C CN 200610011389 CN200610011389A CN100568815C CN 100568815 C CN100568815 C CN 100568815C CN 200610011389 CN200610011389 CN 200610011389 CN 200610011389 A CN200610011389 A CN 200610011389A CN 100568815 C CN100568815 C CN 100568815C
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- China
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- laser
- photodetector
- fiber
- splitting device
- working line
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/071—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using a reflected signal, e.g. using optical time domain reflectometers [OTDR]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0287—Protection in WDM systems
- H04J14/0289—Optical multiplex section protection
- H04J14/029—Dedicated protection at the optical multiplex section (1+1)
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0278—WDM optical network architectures
- H04J14/0279—WDM point-to-point architectures
Abstract
The invention discloses a kind of system for transmitting single-fiber-optic two-way wavelength division multiplexing and guard method thereof, this system comprises laser, receiver, channel join-splitting device and multiplex section protection device, also comprise laser controller, connect one or more first receivers in first laser and the receiver, be used for when fracture takes place the optical fiber of the working line of multiplex section protection device or protection circuit, close first laser, and be used for after the multiplex section protection device is finished the circuit switching, opening first laser again; The light that first laser is sent can be reflected back toward photodetector when fracture takes place the optical fiber of working line or protection circuit.When fracture takes place at the optical fiber of working line or protection circuit in the present invention; by laser controller closed portion laser, eliminate the influence of reverberation, after switching is finished to the multiplex section protection device; open laser and recover communication, thereby realize the multiplex section protection of single fiber bi-directional system easily.
Description
Technical field
The present invention relates to a kind of realization multiplex section protection single fiber bi-directional does not have the device of image intensifer WDM (WavelengthDivision Multiplexing, wavelength division multiplexing) transmission system and control method, and it is mainly used in the optical transmission field.
Background technology
Traditional WDM transmission is finished two-way communication with a pair of optical fiber.The a considerable amount of light waves of each root bearing optical fiber are realized big volume transport.This kind transmission means generally is to carry a pair of business with two-way identical wavelength, and communicating pair uses same wavelength communication.In order to ensure the reliability of communication, prevent that optical fiber from damaging the service disconnection of bringing, protective device is applied in the system.For communicating by letter of point-to-point and annular, we can use the measure of 1+1 multiplex section protection, and this kind measure is simply effective.In one direction, we receive optical splitter (Splitter) with the main line output of channel join-splitting device, and optical splitter sends signal in two optical fiber, and an optical fiber forms working line, and another root optical fiber forms protection circuit.When two paths of signals arrives opposite side; at first come measuring light power by photodetector (OD); in case the optical signal power of working line is during less than certain threshold value; detect controller (CL) and will control optical switch (OS) switching, make the circuit that enters channel join-splitting device switch to protection circuit by working line.After working line recovered, optical switch switched back working line again.Equally, on another direction, can use identical guard method.This guard method is based on ITU-T standard G.841.
As shown in Figure 1, single fiber bi-directional transmission WDM transmission system comprises:
A pair of channel join-splitting device 101 and 102 by the optical fiber connection;
The a plurality of lasers 103 that are connected with channel join-splitting device 101;
Be connected with channel join-splitting device 102, and a plurality of receivers 104 corresponding with a plurality of laser 103;
The a plurality of lasers 103 ' that are connected with channel join-splitting device 102;
Be connected with channel join-splitting device 101, and a plurality of receivers 104 ' corresponding with a plurality of laser 103 ';
Single fiber bi-directional transmission WDM transmission system is by the signal of transmission different directions different wave length in an optical fiber, be implemented in the optical fiber and finish two-way communication, can save the trunk cable resource effectively, the key technology of this transmission is the partial wave of finishing by channel join-splitting device in the transmitting-receiving both sides on the direction on ripple and another direction of closing, connect by an optical fiber between the channel join-splitting device, in case yet the optical fiber between the channel join-splitting device break, all business are all obstructed.
As shown in Figure 2; it is the schematic diagram that is provided with the single fiber bi-directional transmission WDM transmission system of traditional 1+1 multiplex section protection measure; also comprise 50/50 optical splitter 105, two photodetectors 106,106 ', one optical switch 107 and optical switch controllers 108 between the channel join- splitting device 101 and 102, wherein:
The input of this 50/50 optical splitter 105 is connected with channel join-splitting device 101, and two outputs in addition are connected to form working line and protection circuit with two photodetectors 106,106 respectively;
One optical switch 107, its input are connected with two photodetectors 106,106 ' respectively, and output is connected with channel join-splitting device 102;
One optical switch controller 108 connects photodetector 106,106 ' and optical switch, according to photodetector 106,106 ' output control optical switch 107 realize that working lines switch and protection circuit between switching.
Yet; when the single fiber bi-directional transmission WDM transmission system among Fig. 2 is utilized the 1+1 multiplex section protection of single fiber bi-directional communication; if working line optical fiber breaks; fracture end face reflection light is got back to photodetector 106, if the circuit return loss is bigger, the light that enters photodetector 106 is below detection threshold; optical switch 107 still can be switched; but when back light power during greater than detection threshold, circuit can't be finished and switch, and can't realize effectively protection to communication.
Summary of the invention
For solving existing system causes working line and protection circuit owing to catoptrical existence the problem that normally to carry out of switching; the object of the present invention is to provide a kind of system for transmitting single-fiber-optic two-way wavelength division multiplexing and guard method thereof; make system for transmitting single-fiber-optic two-way wavelength division multiplexing when the optical fiber of working line or protection circuit breaks; can in time realize switching of circuit, communication is realized effectively protection.
To achieve these goals; the invention provides a kind of system for transmitting single-fiber-optic two-way wavelength division multiplexing; comprise laser, receiver, channel join-splitting device and multiplex section protection device; described multiplex section protection device comprises optical splitter, working line, protection circuit and the photodetector corresponding with working line and protection circuit; wherein, also comprise:
Laser controller, connect one or more first receivers in first laser and the described receiver, be used for when fracture takes place the optical fiber of the working line of multiplex section protection device or protection circuit, close described first laser, and be used for after the multiplex section protection device is finished the work switching between circuit and the protection circuit, opening described first laser again;
The light that described first laser is sent can be reflected back toward described photodetector when fracture takes place the optical fiber of working line or protection circuit.
Above-mentioned system for transmitting single-fiber-optic two-way wavelength division multiplexing; wherein; described laser controller judges according to the LOS situation of described first receiver whether the optical fiber of described working line or protection circuit ruptures, and simultaneously judges whether finish the work the switching between circuit and the protection circuit of multiplex section protection device according to the LOS situation of described first receiver.
Above-mentioned system for transmitting single-fiber-optic two-way wavelength division multiplexing, wherein,, described laser controller then is judged as the working line of described multiplex section protection device when described first receiver produces the LOS and the lasting very first time or the optical fiber of protection circuit ruptures; After described laser controller was closed described first laser, described first receiver continued for second time and does not produce LOS, then was judged as finished the work the switching between circuit and the protection circuit of multiplex section protection device.
Above-mentioned system for transmitting single-fiber-optic two-way wavelength division multiplexing, wherein, described first receiver and described first laser are positioned at the same side.
Above-mentioned system for transmitting single-fiber-optic two-way wavelength division multiplexing, wherein, the number of described laser controller is identical with the described first laser number, and described laser controller connects the laser and the receiver of one group of correspondence.
Above-mentioned system for transmitting single-fiber-optic two-way wavelength division multiplexing, wherein, the number of described laser controller is 1, and connects in described first laser and described first receiver at least one.
In order better to realize above-mentioned purpose, the present invention also provides a kind of guard method of system for transmitting single-fiber-optic two-way wavelength division multiplexing, comprises the steps:
Step a, when fracture takes place in the working line of multiplex section protection device or the optical fiber of protection circuit, laser controller is closed first laser, and the light that described first laser is sent can be reflected back toward photodetector when fracture takes place the optical fiber of working line or protection circuit;
Step b, the multiplex section protection device switching between circuit and the protection circuit of finishing the work;
Step c, after switching was finished, described laser controller was opened described first laser again.
The guard method of above-mentioned system for transmitting single-fiber-optic two-way wavelength division multiplexing; wherein; described laser controller judges according to the LOS situation of described first receiver whether the optical fiber of described working line or protection circuit ruptures, and simultaneously judges whether finish the work the switching between circuit and the protection circuit of multiplex section protection device according to the LOS situation of described first receiver.
The guard method of above-mentioned system for transmitting single-fiber-optic two-way wavelength division multiplexing, wherein, described laser controller then is judged as the working line of described multiplex section protection device or the optical fiber of protection circuit ruptures when described first receiver produces the LOS and the lasting very first time; After described laser controller was closed described first laser, described first receiver continued for second time and does not produce LOS, then was judged as finished the work the switching between circuit and the protection circuit of multiplex section protection device.
System for transmitting single-fiber-optic two-way wavelength division multiplexing of the present invention and guard method thereof; when fracture takes place in the optical fiber of working line or protection circuit; laser controller closed portion laser; eliminated the influence of reverberation to the multiplex section protection device; and after switching is finished; open laser and recover communication, thereby make the multiplex section protection device can switch circuit effectively, realize the multiplex section protection of single fiber bi-directional system easily.
Description of drawings
Fig. 1 is the structural representation of single fiber bi-directional transmission WDM transmission system;
Fig. 2 is the schematic diagram that is provided with the single fiber bi-directional transmission WDM transmission system of multiplex section protection measure;
Fig. 3 is the structural representation of single fiber bi-directional transmission WDM transmission system of the present invention;
Fig. 4 is that single fiber bi-directional transmission WDM transmission system of the present invention is finished the schematic diagram after circuit switches;
Fig. 5 is the schematic flow sheet that single fiber bi-directional transmission WDM transmission system of the present invention realizes protection.
Embodiment
System for transmitting single-fiber-optic two-way wavelength division multiplexing of the present invention as shown in Figure 3, is described for convenient, divides A and B both sides to be described, and comprising:
Be arranged at the channel join-splitting device 101 and 102 of A side and B side respectively;
Be arranged at a plurality of lasers 103 of A side, be connected with channel join-splitting device 101;
Be arranged at a plurality of receivers 104 of B side, be connected with channel join-splitting device 102, and corresponding with a plurality of laser 103 respectively;
Be arranged at a plurality of lasers 103 ' of B side, be connected with channel join-splitting device 102;
Be arranged at a plurality of receivers 104 ' of A side, be connected with channel join-splitting device 101, and corresponding with a plurality of laser 103 ' respectively;
The multiplex section protection device and the laser controller 109 that connect channel join-splitting device 101 and 102, wherein:
This multiplex section protection device comprises 50/50 optical splitter 105, photodetector 106,106 ', optical switch 107 and optical switch controller 108, wherein:
The input of this 50/50 optical splitter 105 is connected with the channel join-splitting device 101 of A side, and two outputs in addition are connected to form working line and protection circuit with two photodetectors 106,106 respectively;
The input of this optical switch 107 is connected with two photodetectors 106,106 ' respectively, and output is connected with channel join-splitting device 102;
At least one laser controller 109; be connected with laser 103 ' with the receiver 104 of B side respectively; control the switch of laser 103 ' according to the LOS situation of receiver 104; thereby when fracture takes place circuit optical fiber, close the laser 103 ' of B side, be reflected at disconnected fine place with the light that stops the B side to be sent; the multiplex section protection device can normally be switched; after circuit switches, open the laser 103 ' of B side, recover professional.
At this, laser controller can have multiple connected mode:
The first, one laser controller, any one in a plurality of receivers 104 of connection B side connects all lasers 103 ' of B side simultaneously;
The second, a plurality of laser controllers, number is identical with the laser number of B side, and wherein each is connected situation promptly shown in Figure 3 with one group of the B side corresponding receiver respectively with laser;
Certainly, also can be that the setting of laser controller also can be the mixing setting of above set-up mode.
In conjunction with situation shown in Figure 3, the course of work of this laser controller is described below:
After the fibercuts of working line; the receiver 104 of B side can not receive the signal that the laser 103 of A side sends; produce the LOS alarm; continue t1 after the time at LOS; the laser 103 ' of laser controller 109 control B sides cuts out; therefore the B side does not have light output; therefore disconnected fine place does not just have light reflected light detector 106 yet; photodetector 106 detected light in detection threshold with next notice optical switch controller 108; switch to protection circuit by optical switch controller 108 control optical switch 107 from working line, finish the work of switching.
The photodetector 106 ' of protection circuit will continue to detect light behind the line switching; can not be interfered and produce the optical switch vibration; from line switching successfully; B side receiver 104 receives lasting t2 does not have LOS; then open by laser controller 109 control lasers 103 '; business recovery is normal, as shown in Figure 4.Because two-way services are to transmit in same optical fiber, therefore the business of having protected A, B both sides is simultaneously switched in protection.For the whole time of switching, be ts the operate time of supposing optical switch itself, and time of being spent of whole protecting work is so: t1+t2+ts.
Fig. 5 is a system for transmitting single-fiber-optic two-way wavelength division multiplexing work operational process schematic diagram of the present invention, comprises the steps:
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (2)
1, a kind of system for transmitting single-fiber-optic two-way wavelength division multiplexing comprises:
Be arranged at the channel join-splitting device (101) of A side and be arranged at the channel join-splitting device (102) of B side;
Be arranged at a plurality of lasers (103) of A side, be connected with the channel join-splitting device (101) of A side;
Be arranged at a plurality of receivers (104) of B side, be connected with the channel join-splitting device (102) of B side, and a plurality of lasers (103) with the A side be corresponding respectively;
Be arranged at a plurality of lasers (103 ') of B side, be connected with the channel join-splitting device (102) of B side;
Be arranged at a plurality of receivers (104 ') of A side, be connected with the channel join-splitting device (101) of A side, and a plurality of lasers (103 ') with the B side be corresponding respectively;
The multiplex section protection device of the channel join-splitting device (101) of connection A side and the channel join-splitting device (102) of B side;
Described multiplex section protection device comprises 50/50 optical splitter (105), first photodetector (106), second photodetector (106 '), optical switch (107) and optical switch controller (108); The input of this 50/50 optical splitter (105) is connected with the channel join-splitting device (101) of A side, output and first photodetector (106) in two outputs of this 50/50 optical splitter (105) are connected to form working line, and another output and second photodetector (106 ') are connected to form protection circuit; The input of this optical switch (107) is connected with first photodetector (106), second photodetector (106 ') respectively, and output is connected with the channel join-splitting device (102) of B side; Optical switch controller (108), connect first photodetector (106), second photodetector (106 ') and optical switch (107), according to output control optical switch (107) the realization working line of first photodetector (106), second photodetector (106 ') and the switching between the protection circuit;
It is characterized in that this system also comprises:
The identical a plurality of laser controllers of laser number of laser controller or number and B side;
When the laser controller number was one in this system, any one in a plurality of receivers (104) of this laser controller connection B side connected all lasers (103 ') of B side simultaneously;
When the laser number of the number of laser controller in this system and B side was identical, wherein each laser controller was connected with laser with one group of the B side corresponding receiver respectively;
Described laser controller is used for when fracture takes place the optical fiber of the working line of multiplex section protection device, close connected described laser, and be used for after the multiplex section protection device is finished the work switching between circuit and the protection circuit, opening connected described laser again;
The light that a plurality of lasers (103 ') of described B side are sent can be reflected back toward described first photodetector (106) when fracture takes place the optical fiber of working line.
2, system for transmitting single-fiber-optic two-way wavelength division multiplexing according to claim 1, it is characterized in that, described laser controller judges according to the dropout LOS situation of the receiver (104) of described B side whether the optical fiber of described working line ruptures, and simultaneously judges whether finish the work the switching between circuit and the protection circuit of multiplex section protection device according to the dropout LOS situation of the receiver (104) of described B side;
After the fibercuts of working line, the receiver of B side (104) can not receive the signal that the laser (103) of A side sends, produce the LOS alarm, continue t1 after the time at LOS, the laser (103 ') of the connected B side of laser controller (109) control cuts out;
Behind the line switching, B side receiver (104) receives lasting t2 does not have LOS, is then opened by the laser (103 ') of the connected B side of laser controller (109) control, and business recovery is normal.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 200610011389 CN100568815C (en) | 2006-02-28 | 2006-02-28 | A kind of system for transmitting single-fiber-optic two-way wavelength division multiplexing and guard method thereof |
PCT/CN2006/003743 WO2007098662A1 (en) | 2006-02-28 | 2006-12-30 | A single fiber bi-directional wdm transmission system and a protection method thereof |
Applications Claiming Priority (1)
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CN 200610011389 CN100568815C (en) | 2006-02-28 | 2006-02-28 | A kind of system for transmitting single-fiber-optic two-way wavelength division multiplexing and guard method thereof |
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CN101030879A CN101030879A (en) | 2007-09-05 |
CN100568815C true CN100568815C (en) | 2009-12-09 |
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CN 200610011389 Expired - Fee Related CN100568815C (en) | 2006-02-28 | 2006-02-28 | A kind of system for transmitting single-fiber-optic two-way wavelength division multiplexing and guard method thereof |
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CN (1) | CN100568815C (en) |
WO (1) | WO2007098662A1 (en) |
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CN109428665B (en) * | 2017-08-22 | 2020-10-23 | 中国电信股份有限公司 | Wavelength division multiplexing transmission device, reception device, relay device, and transmission system |
CN113448021B (en) * | 2020-03-24 | 2022-09-23 | 华为技术有限公司 | Optical fiber connector, single-fiber bidirectional optical assembly and optical fiber transmission system |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5069521A (en) * | 1989-05-12 | 1991-12-03 | Gec Plessey Telecommunications Limited | Optical transmission apparatus |
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Publication number | Priority date | Publication date | Assignee | Title |
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EP1361688B1 (en) * | 2002-05-06 | 2005-09-28 | Alcatel | Method of protected transmission on a WDM network |
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2006
- 2006-02-28 CN CN 200610011389 patent/CN100568815C/en not_active Expired - Fee Related
- 2006-12-30 WO PCT/CN2006/003743 patent/WO2007098662A1/en active Application Filing
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5069521A (en) * | 1989-05-12 | 1991-12-03 | Gec Plessey Telecommunications Limited | Optical transmission apparatus |
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WO2007098662A1 (en) | 2007-09-07 |
CN101030879A (en) | 2007-09-05 |
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