CN1203634C - Hybrid polarization mode dispersion compensation method - Google Patents
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- CN1203634C CN1203634C CNB031145736A CN03114573A CN1203634C CN 1203634 C CN1203634 C CN 1203634C CN B031145736 A CNB031145736 A CN B031145736A CN 03114573 A CN03114573 A CN 03114573A CN 1203634 C CN1203634 C CN 1203634C
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Abstract
The present invention provides a mixing type polarization mode dispersion compensation method. The present invention is characterized in that a device manufactured by the method comprises a forward error correction coding device and an optical polarization mode dispersion compensator, wherein the forward error correction coding device comprises an encoder and a decoder, the encoder is positioned in an optical transmitter, and the decoder is positioned in an optical receiver; the optical polarization mode dispersion compensator is positioned in an optical fiber transmission channel. The compensation method of the device comprises: the characteristics of the optical fiber transmission channel are improved by the optical polarization mode dispersion compensator; residual polarization mode dispersion and other error codes which are generated by noise are corrected by the forward error correction coding device in an electrical signal domain. The method of the present invention can simultaneously reduce the realizing difficulty of the polarization mode dispersion compensation techniques of the optical signal domain and the electrical signal domain, and reduce the realizing cost of the polarization mode dispersion compensation device.
Description
One, technical field
The invention belongs to technical field of optical fiber communication, relate to a kind of polarization mode dispersion (PMD) compensation method, particularly a kind of mixed type polarization mode dispersion (PMD) compensation method.
Two, background technology
Polarization mode dispersion is the principal element of restriction optical signal transmission distance in the high-speed communication, in the optical transmission system of the above speed of 10Gb/s, in order to reach economic transmission range, generally all needs to carry out polarization mode dispersion (PMD) compensation.The scheme of polarization mode dispersion (PMD) compensation is mainly divided three major types at present: (1) compensates in the light signal territory; (2) compensate in signal of telecommunication territory; (3) carry out mixed compensation in light signal territory and signal of telecommunication territory simultaneously.From present prior art situation, the compensation ability of the scheme that compensates in signal of telecommunication territory is limited; The scheme that compensates in the light signal territory can the polarization mode dispersion of reasonable compensation single order, to the compensation scheme system complex of high-order dispersion, and not too successful; The mixed compensation scheme compensates polarization mode dispersion in the light signal territory and the signal of telecommunication simultaneously, and effect is relatively good, as United States Patent (USP): 6437892.The basic thought of the mixed compensation scheme that proposes is in the light signal territory polarization direction of light signal periodically to be changed at present, utilizes the forward error correction coding technology that the error code that polarization mode dispersion produces is proofreaied and correct in signal of telecommunication territory.In this method, because the optical transmission channel forcibly makes the extremely low situation of signal to noise ratio periodically occur, the error rate index of final system can be not very good.
Three, summary of the invention
Defective or deficiency at above-mentioned prior art existence, the objective of the invention is to, a kind of novel mixed type polarization mode dispersion (PMD) compensation method is proposed, its basic thought is in the most of single order polarization mode dispersion of light signal domain compensation, make optical transmission channel signal to noise ratio be in state preferably all the time, then the error code that utilizes residual amount of forward error correction coding correction of typist's errors single order polarization mode dispersion and high-order polarization mode dispersion to cause in signal of telecommunication territory.This method can reduce the realization difficulty of light signal territory and signal of telecommunication territory polarization mode dispersion (PMD) compensation technology simultaneously, reduces the realization cost of polarization mode dispersion (PMD) compensation device.
To achieve these goals, the technical scheme that adopted of mixed type polarization mode dispersion (PMD) compensation method of the present invention may further comprise the steps at least:
1) forward error correction encoding apparatus and an optical polarization modal dispersion compensator are set;
2) forward error correction encoding apparatus comprises an encoder and a decoder, and encoder is positioned at optical sender, and decoder is positioned at optical receiver;
3) optical polarization modal dispersion compensator is arranged in optical fiber transport channel;
4) in the light signal territory, utilize optical polarization modal dispersion compensator on the optical fiber transport channel to improve the characteristic of optical fiber transport channel, simultaneously,, utilize forward error correction encoding apparatus to proofread and correct the error code that remaining polarization mode dispersion and other noise produce in signal of telecommunication territory.
Some other characteristics of the present invention are:
Described optical polarization modal dispersion compensator by the Polarization Controller between optical sender and optical fiber transport channel input, between optical fiber transport channel output and optical receiver polarization mode dispersion (PMD) compensation measurement of effectiveness device and form to the apparatus for transmitting signal of Polarization Controller the loopback of polarization mode dispersion (PMD) compensation effect information; Wherein, Polarization Controller is according to the polarization mode dispersion (PMD) compensation effect of apparatus for transmitting signal loopback, all the time with the polarization direction of input optical signal to direction that certain Principal State of Polarization of fiber channel overlaps on adjust; Polarization mode dispersion (PMD) compensation measurement of effectiveness device can be the polarization state measurement mechanism, can also be the real-time error rate monitoring arrangement on the optical receiver; Apparatus for transmitting signal can be another light emission and receiving system of transmission in the other direction, also can be the custom-designed dedicated transmissions device of offering on another wavelength channel.
Described optical polarization modal dispersion compensator forms for the apparatus for transmitting signal of Polarization Controller by the Polarization Controller between optical fiber transport channel output and optical receiver, polarization mode dispersion device, polarization mode dispersion (PMD) compensation measurement of effectiveness device and with the loopback of polarization mode dispersion (PMD) compensation effect information; Wherein, Polarization Controller has two kinds of mode of operations: (1) is according to the polarization mode dispersion (PMD) compensation effect of apparatus for transmitting signal loopback, all the time with two main polarization directions of optical fiber transport channel to direction that two Principal State of Polarizations of polarization mode dispersion device overlap on adjust, and make the direction of the polarization mode dispersion on the optical fiber transport channel opposite with the direction of the polarization mode dispersion of polarization mode dispersion device; (2) dither signal is mixed with the polarization mode dispersion (PMD) compensation effect signal of apparatus for transmitting signal loopback, all the time with two main polarization directions of optical fiber transport channel to direction that two Principal State of Polarizations of polarization mode dispersion device overlap on adjust, and make the direction of the polarization mode dispersion on the optical fiber transport channel opposite with the direction of the polarization mode dispersion of polarization mode dispersion device; Polarization mode dispersion (PMD) compensation measurement of effectiveness device can be the polarization degree measurement mechanism, can also be electronics polarization mode dispersion measurement device; The dispersion measure of polarization mode dispersion device can be fixed, and as the high birefringence rate polarization maintaining optical fibre of regular length, also can be variable, as a two-channel interferometer device; Apparatus for transmitting signal is given Polarization Controller with the feedback information of polarization mode dispersion measurement device output.
Described optical polarization modal dispersion compensator is made up of two parts; First is a polarization state perturbator between optical signal transmitter and optical fiber transport channel input, and it changes or change at random the polarization state of the light signal that is input to optical fiber transport channel according to certain rules; Second portion is between optical fiber transport channel output and optical receiver, by polarization state measurement mechanism, Polarization Controller, polarization mode dispersion device and selectable polarization mode dispersion (PMD) compensation measurement of effectiveness device with selectablely form to the apparatus for transmitting signal of Polarization Controller and polarization mode dispersion device the loopback of polarization mode dispersion (PMD) compensation effect information; Wherein, two Principal State of Polarization directions of polarization state measurement mechanism measuring optical fiber transmission channel, control then Polarization Controller make through two Principal State of Polarization directions of the optical fiber transport channel of Polarization Controller to direction that two Principal State of Polarizations of polarization mode dispersion device overlap on adjust, and make the direction of the polarization mode dispersion on the optical fiber transport channel opposite with the direction of the polarization mode dispersion of polarization mode dispersion device; The dispersion measure of polarization mode dispersion device can be fixed, and as the high birefringence rate polarization maintaining optical fibre of regular length, also can be variable, as a two-channel interferometer device; When the dispersion measure of polarization mode dispersion device can be adjusted, need to adopt the information of polarization mode dispersion (PMD) compensation measurement of effectiveness device loopback dynamically to adjust chromatic dispersion compensation quantity; This device can be the polarization degree measurement mechanism, can also be electronics polarization mode dispersion measurement device; Apparatus for transmitting signal is given the polarization mode dispersion device with the feedback information of polarization mode dispersion measurement device output, the dynamic compensation of control chromatic dispersion.
Described optical polarization modal dispersion compensator is made up of two parts; First is a polarization state perturbator between optical signal transmitter and optical fiber transport channel input, and it changes or change at random the polarization state of the light signal that is input to optical fiber transport channel according to certain rules; Second portion forms for the apparatus for transmitting signal of Polarization Controller and polarization mode dispersion device by Polarization Controller, polarization mode dispersion device, polarization mode dispersion (PMD) compensation measurement of effectiveness device with the loopback of polarization mode dispersion (PMD) compensation effect information between optical fiber transport channel output and optical receiver; Wherein, Polarization Controller according to the information of polarization mode dispersion (PMD) compensation measurement of effectiveness device loopback make through two main polarization directions of the optical fiber transport channel of Polarization Controller to direction that two Principal State of Polarizations of polarization mode dispersion device overlap on adjust, and make the direction of the polarization mode dispersion on the optical fiber transport channel opposite with the direction of the polarization mode dispersion of polarization mode dispersion device; The dispersion measure of polarization mode dispersion device can be fixed, and as the high birefringence rate polarization maintaining optical fibre of regular length, also can be variable, as a two-channel interferometer device; When the dispersion measure of polarization mode dispersion device can be adjusted, need dynamically to adjust chromatic dispersion compensation quantity according to the information of polarization mode dispersion (PMD) compensation measurement of effectiveness device loopback; Polarization mode dispersion (PMD) compensation measurement of effectiveness device can be the polarization degree measurement mechanism, can also be electronics polarization mode dispersion measurement device; Apparatus for transmitting signal is given Polarization Controller and polarization mode dispersion device with the feedback information of polarization mode dispersion (PMD) compensation measurement of effectiveness device output.
The described decoder that is arranged in the encoder of optical sender and is arranged in optical receiver is positioned on the following a certain position: (1) encoder is between electronics multiplexer and electro-optical conversioning device, and decoder is between electrooptical device and electron solutions multiplexer; (1) encoder is between signal of telecommunication input interface and electronics multiplexer, and decoder is between electron solutions multiplexer and electrical signal output interface; (3) encoder is arranged in a certain speed multiplex interface of electronics multiplexer place, and decoder is arranged in electron solutions multiplexer and the encoder demultiplexing interface of same rate mutually.
Described encoder can adopt the REED-SOLOMON sign indicating number, also can adopt linear code, can also adopt REED-SOLOMON sign indicating number and interleaved code hybrid coding.
The workflow of described REED-SOLOMON code coder is: the information code current of (1) input is divided into the N road through string and conversion, and N is positive integer more than or equal to 1; (2) each tributary signal is carried out the REED-SOLOMON coding, add check code; (3) signal behind the coding of N road is changed output through also going here and there; The workflow of said REED-SOLOMON sign indicating number decoder is opposite with the workflow of REED-SOLOMON code coder: the encoded code stream of (1) input is divided into the N road through string and conversion, and N is positive integer more than or equal to 1; (2) each tributary signal is carried out the REED-SOLOMON decoding, remove check code; (3) the N road is separated behind the coding information code current through and string conversion output.
The workflow of described Coded by Linear Codes device is: (1) N road information code current is the input coding device simultaneously; (2) encoder takes out some positions and carries out uniform enconding in the information code current of N road, adds check code; (3) encoder is N road information code current output, simultaneously with the K bit check that inserts with the K1 road signal output of information code current same rate; The workflow of said linear code decoder is opposite with the workflow of Coded by Linear Codes device: (1) is with N road information code current and K1 road verification code stream while input decoder; (2) decoder takes out some positions and carries out linear codec in the code stream of N+K1 road, removes check code; (3) decoder is exported N road information code current.
The workflow of the encoder of described REED-SOLOMON sign indicating number and interleaved code hybrid coding is: the information code current of (1) input is divided into the N road through string and conversion, and N is positive integer more than or equal to 1; (2) each tributary signal is carried out the REED-SOLOMON coding, add check code; (3) the REED-SOLOMON sign indicating number behind the coding of N road is carried out interleaved code, through also string conversion output; The workflow of the decoder of said REED-SOLOMON sign indicating number and interleaved code hybrid coding is opposite with the workflow of encoder: what (1) was imported is divided into the N road through the REED-SOLOMON of interleaved code code stream behind string and conversion reconciliation interleaved code, N is positive integer more than or equal to 1; (2) each tributary signal is carried out the REED-SOLOMON decoding, remove check code; (3) the N road is separated behind the coding information code current through and string conversion output.
The present invention suggests plans and can reduce the realization difficulty of light signal territory and signal of telecommunication territory polarization mode dispersion (PMD) compensation technology simultaneously, reduces the realization cost of polarization mode dispersion (PMD) compensation device.
Four, description of drawings
Fig. 1 is the structural representation of the mixed type polarization mode dispersion (PMD) compensation device finished according to technical scheme of the present invention;
Fig. 2 is first kind of embodiment of technical solution of the present invention;
Fig. 3 is second kind of embodiment of technical solution of the present invention;
Fig. 4 is the third embodiment of technical solution of the present invention;
Fig. 5 is the 4th kind of embodiment of technical solution of the present invention;
Fig. 6 is the 5th kind of embodiment of technical solution of the present invention;
Fig. 7 is a kind of structural representation of interleaved code device in the technical solution of the present invention;
Fig. 8 is a kind of structural representation of interleaved decoder in the technical solution of the present invention;
Fig. 9 is a kind of structural representation of REED-SOLOMON encoder in the technical solution of the present invention;
Figure 10 is a kind of structural representation of REED-SOLOMON decoder in the technical solution of the present invention;
Figure 11 is a kind of structural representation of technical solution of the present invention neutral line encoder;
Figure 12 is a kind of structural representation of technical solution of the present invention neutral line decoder;
Label among the above-mentioned figure is expressed as respectively, and 1 is optical sender, 2 optical receivers, and 3 Transmission Fibers, 4 light polarization mould compensators, 100 is transmitter signal of telecommunication input interface, and 200 is the receiver electrical signal output interface, and 10 is encoder, and 20 is decoder; 40 is Polarization Controller, 41 is the measuring polarization state device, 47 is that electronics radio frequency polarization mode dispersion (PMD) compensation measurement of effectiveness device, 49 is the degree of polarization measurement mechanism, and 42 is the special signal transmitter, and 43 is wave multiplexer, 44 is channel-splitting filter, 45 is the special signal receiver, and 46 is the polarization dispersion device, and 48 is the polarization state perturbator, 50,50 (1), 50 (2) is luminous-power distributor (also claiming coupler), and 6 (1), 6 (2) is signal transmitter; 60 (1), 60 (2), 60 (3) is signal transmission line; 1 ' is optical sender, and 2 ' is optical receiver, and 3 ' is optical fiber transport channel; 11 is electrical to optical converter, and 12 is electrical multiplexer, and 21 is optical-electrical converter, and 22 are the electrolysis multiplexer; 10RS (I) (I is a positive integer) is the REED-SOLOMON code signal, and 20RS (I) (I is a positive integer) is the REED-SOLOMON decoded signal, and 10IT is the interleaved code module, and 20IT is staggered decoder module; 10 (1) is string and modular converter in the encoder, and 10 (2, I) (I is a positive integer) is the REED-SOLOMON coding module, and 10 (3) is parallel serial conversion module in the encoder; 20 (1) is string and modular converter in the decoder, and 20 (2, I) (I is a positive integer) is the REED-SOLOMON decoder module, and 10 (3) is parallel serial conversion module in the decoder; 10PRS is parallel linear coding module, and 20PRS is parallel linear decoder module; 100 (I) (I is a positive integer) are the code stream in the encoder, and 200 (I) (I is a positive integer) are the code stream in the decoder.
Five, embodiment
The present invention is described in further detail below in conjunction with specific embodiment that accompanying drawing and inventor provide.
The mixed type polarization mode dispersion (PMD) compensation apparatus structure schematic diagram of Fig. 1 for finishing according to technical scheme of the present invention is made up of the forward error correction coder 10 that is arranged in transmitter 1, the light polarization modal dispersion compensator 4 that is arranged in optical fiber transport channel 3 and the forward error correction decoder 20 that is arranged in receiver 2 the polarization mode dispersion (PMD) compensation device.
Fig. 2 is the principle schematic of first embodiment of the present invention, wherein encoder 10 in transmitter between electrical multiplexer 12 and electrical to optical converter 11, decoder 20 in receiver between optical-electrical converter 21 and demodulation multiplexer 22; Light polarization modal dispersion compensator comprises three parts: (1) Polarization Controller 40 between transmitter 1 and optical fiber transport channel 3; (2) be arranged in the error rate monitor of receiver 2; (3) the compensation effect transfer device that constitutes by signal transmitter 6 (1), optical sender 1 ', optical fiber transport channel 3 ', optical receiver 2 ' and signal transmitter 6 (2).In this transmission system, by the low speed signal of telecommunication of interface 100 input after multiplexer 12 is multiplexing, encoded again device 10 codings, then by electrical to optical converter 11 outputs, after adjusting polarization state, this optical signals Polarization Controller 40 is input in the optical fiber transport channel 3, Polarization Controller 40 rotates the polarization state of light signal all the time to the direction that overlaps with certain Principal State of Polarization of optical fiber transport channel 3, at optical receiver 2 places, give the optical sender 1 ' of transmission in the other direction with the error code supervisory signal on the receiver 2 by signal transmitter 6 (1), being transferred to optical receiver 2 ' by optical fiber 3 ' again locates, give Polarization Controller 40 by signal transmitter 6 (1) then, adjustment is input to the polarization direction of the light signal in the optical fiber 3 to Polarization Controller 40 according to bit error performance; Simultaneously, on optical receiver 2, after the signal of opto-electronic conversion is decoded by decoder 20, give demodulation multiplexer 22, become low speed signal then by interface 200 outputs; By the forward error correction in compensation of the polarization mode on the transmission line and the electric territory signal, the signal of being exported by interface 200 just can satisfy transmission requirement.
Fig. 3 is the principle schematic of second embodiment of the present invention, wherein encoder 10 in transmitter between multiplexer 12 and input interface 100, decoder 20 in receiver demodulation multiplexer 22 and output interface 200 and between; Light polarization modal dispersion compensator comprises three parts: (1) Polarization Controller 40 between transmitter 1 and optical fiber transport channel 3; (2) be positioned at the power divider 50 and the polarization state measurement mechanism 41 of 3 of receiver 2 and optical fiber transport channel; (3) the compensation effect transfer device that constitutes by signal transmission line 60 (1), the optical sender 42 that works in non-signal wavelength, wave multiplexer 43, channel-splitting filter 44, optical receiver 45 and signal transmission line 60 (2).In this transmission system, all low speed signals of telecommunication by interface 100 inputs are first through error correction coding, export by electrical to optical converter 11 by multiplexer 12 multiplexing backs then, after adjusting polarization state, this optical signals Polarization Controller 40 is input in the optical fiber transport channel 3, Polarization Controller 40 rotates the polarization state of light signal all the time to the direction that overlaps with a certain Principal State of Polarization of optical fiber transport channel 3, after optical fiber transport channel 3 transmission, tell the part luminous power by power divider 50, as 5%, deliver to light polarization state measuring device 41, its measurement result is sent into optical sender 42 by signal transmission line 60 (1), through wave multiplexer 43, optical fiber 3, channel-splitting filter 44, send into optical receiver 45, give Polarization Controller 40 by signal transmission line 60 (2) then, Polarization Controller 40 is input to the polarization direction of the light signal in the optical fiber 3 according to the polarization state adjustment of fiber-optic output signal; Simultaneously, power divider 50 is delivered to optical receiver 2 with light signal, becomes low speed signal by demodulation multiplexer 22 after opto-electronic conversion, delivers to interface 200 outputs then after decoder 20 decodings; By the forward error correction in compensation of the polarization mode on the transmission line and the electric territory signal, the signal of being exported by interface 200 just can satisfy transmission requirement.
Fig. 4 is the principle schematic of the 3rd embodiment of the present invention, wherein encoder 10 is arranged in the multiplex interface place of certain speed of multiplexer 12 in transmitter, decoder 20 is arranged in the demultiplexing interface of certain speed of demodulation multiplexer 22 in receiver, this speed is identical with speed in the multiplexer; Light polarization modal dispersion compensator is made up of the Polarization Controller 40 that is positioned at 3 of receiver 2 and optical fiber transport channel, polarization dispersion device 46, power divider 50, electronics radio frequency polarization mode dispersion measurement of effectiveness device 47 and signal transmission line 60 (1) and 60 (2).In this transmission system, all low speed signals of telecommunication by interface 100 inputs are multiplexed to a certain speed through multiplexer 12 earlier, as 155Mb/s, carry out error correction coding then, export by electrical to optical converter 11 by multiplexer 12 multiplexing backs again, this light signal is rotated the Principal State of Polarization of transmission line 3 all the time by Polarization Controller 40, and makes both polarization dispersion directions opposite after optical fiber transport channel 3 transmission to the direction that the Principal State of Polarization with light polarization chromatic dispersion device 46 overlaps; Tell the part luminous power by power divider 50, as 5%, deliver to electronics radio frequency polarization mode dispersion measurement of effectiveness device 47, its measurement result is given Polarization Controller 40 by signal transmission line 60 (1), give polarization dispersion device 46 by signal transmission line 60 (2), Polarization Controller 40 and polarization dispersion device 46 are according to 47 the state separately of adjustment as a result; Simultaneously, power divider 50 is delivered to optical receiver 2 with light signal, is become the signal of a certain speed after opto-electronic conversion by demodulation multiplexer 22, as 155Mb/s, then through decoder 20 decodings, delivers to interface 200 outputs by demodulation multiplexer 22 again; By the forward error correction in compensation of the polarization mode on the transmission line and the electric territory signal, the signal of being exported by interface 200 just can satisfy transmission requirement.
Fig. 5 is the principle schematic of the 4th embodiment of the present invention, wherein encoder 10 in transmitter between multiplexer 12 and input interface 100, decoder 20 in receiver demodulation multiplexer 22 and output interface 200 and between; Light polarization modal dispersion compensator comprises following two parts: (1) polarization scrambling device 48 between transmitter 1 and optical fiber transport channel 3; (2) be positioned at power divider 50 (1), measuring polarization state device 41, Polarization Controller 40, polarization dispersion device 46 and selectable power divider 50 (2), degree of polarization measurement mechanism 49 and the signal transmission line 60 (1), 60 (2), 60 (3) of 3 of receiver 2 and optical fiber transport channel.In this transmission system, all low speed signals of telecommunication by interface 100 inputs are first through error correction coding, export by electrooptic conversion module 11 by multiplexer 12 multiplexing backs then, this light signal is at first by polarization state perturbator 48, enter Transmission Fibers 3 then, polarization state perturbator 48 changes the polarization state of the light signal of input optical fibre 3 according to certain rules, or change at random, signal by optical fiber transport channel 3 outputs, tell the part luminous power by power divider 50 (1), as 10%, deliver to light polarization state measuring device 41, light polarization state measuring device 41 is by measuring the direction of two Principal State of Polarizations of optical fiber transport channel 3 to the measurement of light signal polarization state, give Polarization Controller 40 by signal transmission line 60 (1) then, these two Principal State of Polarizations are overlapped with the Principal State of Polarization of polarization dispersion device 46, and make the direction of polarization dispersion opposite, polarization mode dispersion by the light signal behind the polarization dispersion device 46 has just obtained compensation like this, sends into the optical-electrical converter of optical receiver at last.In order to obtain better compensation effect, light signal by 46 outputs of polarization dispersion device can also be told part light by power divider 50 (2), send into degree of polarization measurement mechanism 49, its measurement result is delivered to Polarization Controller and polarization dispersion device 46 by signal transmission line 60 (2) and 60 (3) respectively, further controls 46 the polarization dispersion amount and the anglec of rotation of Polarization Controller 40.Signal after opto-electronic conversion becomes low speed signal by demodulation multiplexer 22, delivers to interface 200 outputs then after decoder 20 decodings; By the forward error correction in compensation of the polarization mode on the transmission line and the electric territory signal, the signal of being exported by interface 200 just can satisfy transmission requirement.
Fig. 6 is the principle schematic of the 5th embodiment of the present invention, wherein encoder 10 in transmitter between multiplexer 12 and input interface 100, decoder 20 in receiver demodulation multiplexer 22 and output interface 200 and between; Light polarization modal dispersion compensator comprises following two parts: (1) polarization scrambling device 48 between transmitter 1 and optical fiber transport channel 3; (2) be positioned at Polarization Controller 40, polarization dispersion compensator 46, power divider 50, degree of polarization measurement mechanism 49, the signal transmission line 60 (1) and 60 (2) of 3 of receiver 2 and optical fiber transport channel.In this transmission system, all low speed signals of telecommunication by interface 100 inputs are first through error correction coding, export by electrooptic conversion module 11 by multiplexer 12 multiplexing backs then, this light signal is at first by polarization state perturbator 48, enter Transmission Fibers 3 then, polarization state perturbator 48 changes the polarization state of the light signal of input optical fibre 3 according to certain rules, or change at random, signal by optical fiber transport channel 3 outputs, tell part luminous energy by control Polarization Controller 40 and polarization dispersion device 46 backs by power divider 50 and send into degree of polarization measurement mechanism 49, degree of polarization measurement mechanism 49 is sent into control Polarization Controller 40 and polarization dispersion device 46 with measurement result respectively by signal transmission line 60 (1) and 60 (2), two Principal State of Polarizations of Transmission Fibers 3 are overlapped with two Principal State of Polarizations of polarization dispersion device 46 all the time, and make the polarization dispersion direction opposite; Enter the photoelectric conversion module of optical receiver by the signal of power divider 50, the signal after opto-electronic conversion becomes low speed signal by demodulation multiplexer 22, delivers to interface 200 outputs then after decoder 20 decodings; By the forward error correction in compensation of the polarization mode on the transmission line and the electric territory signal, the signal of being exported by interface 200 just can satisfy transmission requirement.
Fig. 7 carries out the structural representation of interleaved code for the signal behind the REED-SOLOMON coding.The parallel signal 10RS (1) to be encoded of input ... 10RS (N) becomes serial signal output by interleaved code module 10IT.
The structural representation that Fig. 8 interlocks and decodes for the signal behind REED-SOLOMON coding and interleaved code.The signal to be decoded of input becomes parallel signal 20RS (1) by staggered decoder module 20IT ... 20RS (N) output.
Fig. 9 is a kind of structural representation of REED-SOLOMON encoder, the signal to be encoded of input at first becomes N road parallel signal by deserializer 10 (1), I tributary signal (I from 1 to N) is by encoder 10 (2 then, I) coding, all tributary signals are again by parallel-to-serial converter 10 (3) outputs.
Figure 10 is a kind of structural representation of REED-SOLOMON decoder, the encoded signals of input at first becomes N road parallel signal by deserializer 20 (1), I tributary signal (I from 1 to N) is by decoder 20 (2 then, I) decoding, all tributary signals are again by parallel-to-serial converter 20 (3) outputs.
Figure 11 is a kind of structural representation of linear encoder, and the N road signal to be encoded of input enters parallel encoder 10PRS coding, and with the output of N+K1 road signal, wherein the N road is an original signal then, and the K1 road is the check code signal.
Figure 12 is a kind of structural representation of line decoder, and the N road original signal of input and K1 road check code signal are by code parallel decoder 20PRS coding, and it is defeated to remove K1 road checking signal, with the decoded signal output in N road.
Claims (9)
1. a mixed type polarization mode dispersion (PMD) compensation method is characterized in that, may further comprise the steps at least:
1) forward error correction encoding apparatus and an optical polarization modal dispersion compensator are set;
2) forward error correction encoding apparatus comprises an encoder and a decoder, and encoder is positioned at optical sender, and decoder is positioned at optical receiver;
3) optical polarization modal dispersion compensator is arranged in optical fiber transport channel;
4) in the light signal territory, utilize optical polarization modal dispersion compensator on the optical fiber transport channel to improve the characteristic of optical fiber transport channel, simultaneously,, utilize forward error correction encoding apparatus to proofread and correct the error code that remaining polarization mode dispersion and other noise produce in signal of telecommunication territory;
Said optical polarization modal dispersion compensator by the Polarization Controller between optical sender and optical fiber transport channel input, between optical fiber transport channel output and optical receiver polarization mode dispersion (PMD) compensation measurement of effectiveness device and form to the apparatus for transmitting signal of Polarization Controller the loopback of polarization mode dispersion (PMD) compensation effect information; Wherein, Polarization Controller is according to the polarization mode dispersion (PMD) compensation effect of apparatus for transmitting signal loopback, all the time with the polarization direction of input optical signal to direction that certain Principal State of Polarization of fiber channel overlaps on adjust; Polarization mode dispersion (PMD) compensation measurement of effectiveness device is the polarization state measurement mechanism, or the real-time error rate monitoring arrangement on the optical receiver; Apparatus for transmitting signal is another light emission and receiving system of transmission in the other direction, or the custom-designed dedicated transmissions device of offering on another wavelength channel.
2. mixed type polarization mode dispersion (PMD) compensation method according to claim 1, it is characterized in that said optical polarization modal dispersion compensator forms for the apparatus for transmitting signal of Polarization Controller by the Polarization Controller between optical fiber transport channel output and optical receiver, polarization mode dispersion device, polarization mode dispersion (PMD) compensation measurement of effectiveness device and with the loopback of polarization mode dispersion (PMD) compensation effect information; Wherein, Polarization Controller has two kinds of mode of operations: (1) is according to the polarization mode dispersion (PMD) compensation effect of apparatus for transmitting signal loopback, all the time with two main polarization directions of optical fiber transport channel to direction that two Principal State of Polarizations of polarization mode dispersion device overlap on adjust, and make the direction of the polarization mode dispersion on the optical fiber transport channel opposite with the direction of the polarization mode dispersion of polarization mode dispersion device; (2) dither signal is mixed with the polarization mode dispersion (PMD) compensation effect signal of apparatus for transmitting signal loopback, all the time with two main polarization directions of optical fiber transport channel to direction that two Principal State of Polarizations of polarization mode dispersion device overlap on adjust, and make the direction of the polarization mode dispersion on the optical fiber transport channel opposite with the direction of the polarization mode dispersion of polarization mode dispersion device; Polarization mode dispersion (PMD) compensation measurement of effectiveness device is the polarization degree measurement mechanism, or electronics polarization mode dispersion measurement device; The dispersion measure of polarization mode dispersion device is the high birefringence rate polarization maintaining optical fibre of regular length, or a variable two-channel interferometer device; Apparatus for transmitting signal is given Polarization Controller with the feedback information of polarization mode dispersion measurement device output.
3. mixed type polarization mode dispersion (PMD) compensation method according to claim 1 is characterized in that: said optical polarization modal dispersion compensator is made up of two parts; First is a polarization state perturbator between optical signal transmitter and optical fiber transport channel input, and it changes or change at random the polarization state of the light signal that is input to optical fiber transport channel according to certain rules; Second portion is between optical fiber transport channel output and optical receiver, by polarization state measurement mechanism, Polarization Controller, polarization mode dispersion device and selectable polarization mode dispersion (PMD) compensation measurement of effectiveness device with selectablely form to the apparatus for transmitting signal of Polarization Controller and polarization mode dispersion device the loopback of polarization mode dispersion (PMD) compensation effect information; Wherein, two Principal State of Polarization directions of polarization state measurement mechanism measuring optical fiber transmission channel, control then Polarization Controller make through two Principal State of Polarization directions of the optical fiber transport channel of Polarization Controller to direction that two Principal State of Polarizations of polarization mode dispersion device overlap on adjust, and make the direction of the polarization mode dispersion on the optical fiber transport channel opposite with the direction of the polarization mode dispersion of polarization mode dispersion device; The dispersion measure of polarization mode dispersion device is the high birefringence rate polarization maintaining optical fibre of regular length, or a variable two-channel interferometer device; When the dispersion measure of polarization mode dispersion device can be adjusted, need to adopt the information of polarization mode dispersion (PMD) compensation measurement of effectiveness device loopback dynamically to adjust chromatic dispersion compensation quantity; This device is the polarization degree measurement mechanism, or electronics polarization mode dispersion measurement device; Apparatus for transmitting signal is given the polarization mode dispersion device with the feedback information of polarization mode dispersion measurement device output, the dynamic compensation of control chromatic dispersion.
4. mixed type polarization mode dispersion (PMD) compensation method according to claim 1 is characterized in that, said optical polarization modal dispersion compensator is made up of two parts; First is a polarization state perturbator between optical signal transmitter and optical fiber transport channel input, and it changes or change at random the polarization state of the light signal that is input to optical fiber transport channel according to certain rules; Second portion forms for the apparatus for transmitting signal of Polarization Controller and polarization mode dispersion device by Polarization Controller, polarization mode dispersion device, polarization mode dispersion (PMD) compensation measurement of effectiveness device with the loopback of polarization mode dispersion (PMD) compensation effect information between optical fiber transport channel output and optical receiver; Wherein, Polarization Controller according to the information of polarization mode dispersion (PMD) compensation measurement of effectiveness device loopback make through two main polarization directions of the optical fiber transport channel of Polarization Controller to direction that two Principal State of Polarizations of polarization mode dispersion device overlap on adjust, and make the direction of the polarization mode dispersion on the optical fiber transport channel opposite with the direction of the polarization mode dispersion of polarization mode dispersion device; The dispersion measure of polarization mode dispersion device is the high birefringence rate polarization maintaining optical fibre of regular length, or a variable two-channel interferometer device; When the dispersion measure of polarization mode dispersion device can be adjusted, need dynamically to adjust chromatic dispersion compensation quantity according to the information of polarization mode dispersion (PMD) compensation measurement of effectiveness device loopback; Polarization mode dispersion (PMD) compensation measurement of effectiveness device is the polarization degree measurement mechanism, or electronics polarization mode dispersion measurement device; Apparatus for transmitting signal is given Polarization Controller and polarization mode dispersion device with the feedback information of polarization mode dispersion (PMD) compensation measurement of effectiveness device output.
5. mixed type polarization mode dispersion (PMD) compensation method according to claim 1 is characterized in that, the said encoder that is arranged in optical sender is positioned on the following a certain position with the decoder that is arranged in optical receiver:
(1) encoder is between electronics multiplexer and electro-optical conversioning device, and decoder is between electrooptical device and electron solutions multiplexer;
(2) encoder is between signal of telecommunication input interface and electronics multiplexer, and decoder is between electron solutions multiplexer and electrical signal output interface;
(3) encoder is arranged in a certain speed multiplex interface of electronics multiplexer place, and decoder is arranged in electron solutions multiplexer and the encoder demultiplexing interface of same rate mutually.
6. mixed type polarization mode dispersion (PMD) compensation method according to claim 1 is characterized in that: said encoder adopts the REED-SOLOMON sign indicating number, or adopts linear code, or adopts REED-SOLOMON sign indicating number and interleaved code hybrid coding.
7. mixed type polarization mode dispersion (PMD) compensation method according to claim 6 is characterized in that the workflow of said REED-SOLOMON code coder is:
(1) Shu Ru information code current is divided into the N road through string and conversion, and N is positive integer more than or equal to 1;
(2) each tributary signal is carried out the REED-SOLOMON coding, add check code;
(3) signal behind the coding of N road is changed output through also going here and there;
The workflow of said REED-SOLOMON sign indicating number decoder is opposite with the workflow of REED-SOLOMON code coder:
(1) Shu Ru encoded code stream is divided into the N road through string and conversion, and N is positive integer more than or equal to 1;
(2) each tributary signal is carried out the REED-SOLOMON decoding, remove check code;
(3) the N road is separated behind the coding information code current through and string conversion output.
8. mixed type polarization mode dispersion (PMD) compensation method according to claim 6, it is characterized in that: the workflow of said Coded by Linear Codes device is:
(1) N road information code current while input coding device;
(2) encoder takes out some positions and carries out uniform enconding in the information code current of N road, adds check code;
(3) encoder is N road information code current output, simultaneously with the K bit check that inserts with the K1 road signal output of information code current same rate;
The workflow of said linear code decoder is opposite with the workflow of Coded by Linear Codes device:
(1) with N road information code current and K1 road verification code stream while input decoder;
(2) decoder takes out some positions and carries out linear codec in the code stream of N+K1 road, removes check code;
(3) decoder is exported N road information code current.
9. mixed type polarization mode dispersion (PMD) compensation method according to claim 6 is characterized in that, the workflow of the encoder of said REED-SOLOMON sign indicating number and interleaved code hybrid coding is:
(1) Shu Ru information code current is divided into the N road through string and conversion, and N is positive integer more than or equal to 1;
(2) each tributary signal is carried out the REED-SOLOMON coding, add check code;
(3) the REED-SOLOMON sign indicating number behind the coding of N road is carried out interleaved code, through also string conversion output;
The workflow of the decoder of said REED-SOLOMON sign indicating number and interleaved code hybrid coding is opposite with the workflow of encoder:
That (1) imports is divided into the N road through the REED-SOLOMON of interleaved code code stream behind string and conversion reconciliation interleaved code, N is positive integer more than or equal to 1;
(2) each tributary signal is carried out the REED-SOLOMON decoding, remove check code;
(3) the N road is separated behind the coding information code current through and string conversion output.
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