CN103109481A - Nonlinear compensation method, device and signal receiving system - Google Patents
Nonlinear compensation method, device and signal receiving system Download PDFInfo
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- CN103109481A CN103109481A CN2011800015694A CN201180001569A CN103109481A CN 103109481 A CN103109481 A CN 103109481A CN 2011800015694 A CN2011800015694 A CN 2011800015694A CN 201180001569 A CN201180001569 A CN 201180001569A CN 103109481 A CN103109481 A CN 103109481A
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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
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/697—Arrangements for reducing noise and distortion
Abstract
The present invention relates to the field of communications. A nonlinear compensation method, and in particular a device and a system are provided. The method comprises: computing respectively the square of the module of the input signals R x and R y , and obtaining |R x |2 and |R y |2; computing the filtering coefficient based on R x , R y , |R x |2 and |R y |2, and obtaining the first order filtering coefficient W xy and W yx ; performing filtering on W xy and W yx , and obtaining the filtered first filtering coefficient W' xy and W' yx ; performing delay processing on the input signals R x and R y , and obtaining the signals R xt and R yt synchronized with W' xy and W' yx , and performing filtering on R xt and R yt based on W' xy and W' yx , and obtaining the final output R' x and R' y . The present technical solution has advantages of excellent signal quality and increased OSNR residual of system.
Description
Compensation of nonlinearity method, device and receiving system
Technical field
The present invention relates to the communications field, more particularly to a kind of compensation of nonlinearity method, device and receiving system.
Background technology
Increasingly perfect with industrial chain, palarization multiplexing Transmission system will be widely used in following high-speed optical transmission system.Digital Signal Processing（Digital signal process, DSP) development of technology greatly improves chromatic dispersion (the Chroma dispersion of system, CD) standing grain mouthful polarization mode dispersion (Polarization mode dispersion, PMD) tolerance limit, the principal element of restriction palarization multiplexing Transmission system performance is the nonlinear tolerance of link at present.
In order to improve the nonlinear tolerance of system, prior art provide it is a kind of improve the non-linear compensation method of mission nonlinear tolerance limit, the flow of this method as shown in figure 1, X, Y road signal pass through carrier phase recovery, obtain phase recovery output signal and
Ryin, respectively through the signal ^ d after being adjudicated and;, then according to the signal after expression formula 1. 1,1. 2 and in and judgements xin, S obtain first-order filtering coefficient andw vxin。
yin
Then, to filter factor and it is filtered (one kind that the sliding window in wherein Fig. 1 is averagely filtering) and obtains filtered first-order filtering coefficient and ^, it is right;„、 ;Delay process is carried out, after making it synchronous with yxin, is then filtered, obtains final output
R = R -W R
xy ym 1. 3
Ryin = Ryin yx in 1. 4
Nonlinear compensation effect diagram using the signal of above method final output is as shown in Figure 2, wherein planisphere is split up into four cloud clusters, wherein, the periphery of cloud cluster is the signal of carrier phase recovery unit output, frequency deviation and skew are eliminated, but without nonlinear compensation is carried out, signal quality is poor；It is the signal after nonlinear compensation in the middle part of cloud cluster, with more preferable signal quality.
There is following technical problem in the prior art in the technical scheme provided according to prior art, discovery：
The technical scheme that prior art is provided must eliminate carrier wave frequency deviation and difference by carrier phase recovery unit so that signal can make decisions, but decision error can cause the decline of its performance, especially in low OSNR（Optical signal to noise ratio, OSNR) when, decision error increase, performance can drastically decline, and influence signal quality.
Technical problem
It is an object of the invention to provide a kind of compensation of nonlinearity method, it is intended to which the method for solving prior art is big to the decision error caused by signal decision, hydraulic performance decline, the problem of signal quality is low.
Technical solution
The embodiment of the present invention provides a kind of compensation of nonlinearity method, and methods described includes：Square of input signal and ^ ^ modulus value is calculated respectively, is obtained
；Wherein, the electric signal specially corresponding to X polarization state light signals in polarisation-multiplexed signal, the specially electric signal corresponding to Y polarization state light signals in polarisation-multiplexed signal, X polarization state light signals and Y polarization state light signals are a pair of mutually orthogonal optical signals；
| 2 W W are according to, RyAnd | coefficient calculating is filtered, first-order filtering coefficient is obtainedXJ;Withyx
W W ττ/' ττ/'
Pair and ^ be filtered, obtain filtered first-order filtering coefficient ^^ and ^^;To input signal and RyDelay process is carried out respectively, is obtained and j and signal R synchronous respectivelyxtAnd RyiBe then based on and, to RxtAnd RytBe filtered, obtain final output and.
The embodiment of the present invention also provides a kind of compensation of nonlinearity unit, and the unit includes：Mould squaring module, square of the modulus value for calculating input signal and ^ ^ respectively, is obtained
In, ^ is specially the electric signal for corresponding to X polarization state light signals in polarisation-multiplexed signal, the specially electric signal corresponding to Y polarization state light signals in polarisation-multiplexed signal, and X polarization state light signals and Y polarization state light signals are a pair of mutually orthogonal optical signals；Filter factor computing module, for basis, R
Calculated with coefficient is filtered, obtain single order
W W
Filter factorXJ;And ^
- rank filtration module, for pair
w、
yx；
Time delay module, for carrying out delay process to input signal and respectively, is obtained and ^ and synchronous signal 7 respectivelyχίWith ^ filtration modules, for based on ^ and ^^, being filtered to ^ ^ and ^^, obtain final output ^^ and.The embodiment of the present invention also provides a kind of receiving system, the receiving system is located at the receiving terminal of palarization multiplexing Transmission system, for receiving the palarization multiplexing optical signal that the transmitting terminal of palarization multiplexing Transmission system is sent, the receiving system includes above-mentioned nonlinear compensating device.
The embodiment of the present invention also provides a kind of receiving system, the receiving system is located at the receiving terminal of palarization multiplexing Transmission system, for receiving the palarization multiplexing optical signal that the transmitting terminal of palarization multiplexing Transmission system is sent, the receiving system includes two above-mentioned nonlinear compensating devices, and the receiving system is still further comprised：Chromatic dispersion CD compensating modules, clock recovery module, polarization mode dispersion PMD compensating modules, carrier phase recovery module and decoder；Wherein, the palarization multiplexing optical signal is converted into data signal after treatment in the receiving system, the CD compensating modules carry out CD compensation to the data signal and are output to the clock recovery module, the clock recovery module carries out clock recovery to the signal exported by the CD compensating modules and is output to the PMD compensating modules, the PMD compensating modules carry out PMD compensation to the signal of the first clock recovery module output and are output to first nonlinear compensating device, the signal that first nonlinear compensating device is exported to the PMD compensating modules carries out nonlinear compensation and is output to the carrier phase recovery module, the carrier phase recovery module carries out carrier phase recovery to the signal of the first nonlinear compensating device output and is output to second nonlinear compensating device, the signal that second nonlinear compensating device is exported to the carrier phase recovery module carries out nonlinear compensation and is output to decoder, the decoder enters row decoding to the signal of the second nonlinear compensating device output and handles and export decoding result.
The embodiment of the present invention also provides a kind of receiving system, the receiving system is located at the receiving terminal of palarization multiplexing Transmission system, for receiving the palarization multiplexing optical signal that the transmitting terminal of palarization multiplexing Transmission system is sent, the receiving system includes two above-mentioned nonlinear compensating devices, and described device is still further comprised：Chromatic dispersion CD compensating modules, clock recovery module, polarization mode dispersion PMD compensating modules, carrier phase recovery module, maximum-likelihood sequence estimation module and decoder；Wherein, the palarization multiplexing optical signal is converted into data signal after treatment in the receiving system, the CD compensating modules carry out CD compensation to the data signal and are output to the clock recovery module, the clock recovery module carries out clock recovery to the signal exported by the CD compensating modules and is output to the PMD compensating modules, the PMD compensating modules carry out PMD compensation to the signal of the first clock recovery module output and are output to first nonlinear compensating device, the signal that first nonlinear compensating device is exported to the PMD compensating modules carries out nonlinear compensation and is output to the carrier phase recovery module, the signal that the carrier phase recovery module is exported to the nonlinear compensating device carries out carrier phase recovery and is output to second nonlinear compensating device, the signal that second nonlinear compensating device is exported to the carrier phase recovery module carries out being processed and output to the maximum-likelihood sequence estimation module, the maximum-likelihood sequence estimation module carries out maximum-likelihood sequence estimation to the signal of the second nonlinear compensating device output and is processed and output to decoder, the signal that the decoder is exported to the maximum-likelihood sequence estimation module enters row decoding and handles and export decoding result.
Beneficial effect
Compared with prior art, beneficial effect is the present invention：The present invention square replaces judgement of the prior art with calculate modulus value, with solve decision error caused by judgement big, hydraulic performance decline, the problem of signal quality is low, so the method that the present invention is provided has the advantages that raising signal quality.Brief description of the drawings
A kind of non-linear compensation method flow chart for improvement mission nonlinear that Fig. 1 provides for prior art；The nonlinear compensation effect diagram of the signal for the method output that Fig. 2 provides for use prior art；
Fig. 3 is a kind of compensation of nonlinearity method flow diagram provided in an embodiment of the present invention；
A kind of structure chart for nonlinear compensating device that Fig. 4 provides for one embodiment of the invention；
Fig. 5 is the compensation effect figure of the final output signal of the invention shown by taking PDM-QPSK systems as an example；Fig. 6 is the compensation effect figure that the final output signal of the present invention is shown by taking PDM-16QAM systems as an example；A kind of structure chart for nonlinear compensating device that Fig. 7 provides for further embodiment of this invention；
Fig. 8 is the first structure figure of receiving system provided in an embodiment of the present invention；
Fig. 9 is the second structure chart of receiving system provided in an embodiment of the present invention；
Figure 10 is the 3rd structure chart of receiving system provided in an embodiment of the present invention；
Figure 11 is the 4th structure chart of receiving system provided in an embodiment of the present invention；
Figure 12 is the 5th structure chart of receiving system provided in an embodiment of the present invention.
Embodiment
The present invention provides a kind of compensation of nonlinearity method, and scene is specifically as follows for of the invention realizing：The method that the present invention is provided is completed in the digital signal processor of the receiving end device of palarization multiplexing Transmission system, and the signal of this method processing is the signal that X, Y road are inputted（Wherein, the signal of X roads input corresponds to X polarization state light signals, the signal of Y roads input corresponds to Y polarization state light signals, X polarization state light signals and Y polarization state light signals are the mutually orthogonal optical signals of a pair of polarization states in palarization multiplexing optical signal, and the palarization multiplexing optical signal is as produced by the dispensing device of palarization multiplexing Transmission system）, for convenience of explanation, it is named as here： Rx、 Ry.Palarization multiplexing optical signal is after receiving terminal is handled by coherent reception etc., it is converted into data signal, then again the data signal is handled to recover the data that palarization multiplexing optical signal is carried with digital signal processor, wherein, above-mentioned data signal processor can specifically include following modules, CD compensation, clock recovery, PMD compensation, carrier phase recovery and decoder；Wherein, CD compensating modules can be used for carrying out CD compensation to signal, clock recovery module can be used for carrying out clock recovery processing to signal, PMD compensating modules are used to carry out PMD compensation to signal, carrier phase recovery module is used to carry out signal carrier phase recovery, and decoder is used to enter signal row decoding processing.The nonlinear linear compensation method that the present invention is provided, its flow is as shown in figure 3, this method comprises the following steps：
S3K calculates square of the modulus value of defeated people's signal sum respectively, obtains K and I and is filtered coefficient calculating, obtains-- rank filter factorvWith
Wherein, filter factor calculation expression is specifically as follows:
_ p
Wherein, asterisk (*) represents and takes complex conjugate, and is the desired value of modulus value square, the desired value of modulus value square respectively.In one embodiment, following two ways can obtains desired value, the desired value of modulus value square of modulus value square:（1) average of modulus value square, is calculated, and the average of obtained modulus value square will be calculated as the desired value of modulus value square, the average of modulus value square is calculated, and the average of obtained modulus value square will be calculated as the desired value of modulus value square；
(2), calculate modulus value square and modulus value square and average, the average that calculating is obtained is used as the desired value of modulus value square, the desired value of modulus value square.The specific embodiment of the invention do not limit to it is above-mentioned, 1 | the acquisition methods of value.In addition, should, value can accordingly be set according to different systems, for example：If the modulation system that the transmitting terminal of palarization multiplexing Transmission system is used is non-amplitude modulation(PAM) mode（For example, BPSK, QPSK, 8PSK) when, the equal only one of which of value, can respectively by calculate modulus value square average and modulus value square average obtain；If the modulation system that the transmitting terminal of palarization multiplexing Transmission system is used is amplitude modulation(PAM) mode（For example, 16QAM, 32QAM, 64QAM) when, have in a variety of values, amplitude modulation(PAM) mode and there is N (N^ 2) to plant amplitude range, II, just respectively have N kind values
( ¾? , PxN Pytf Fylf ... ,FyN)0Respectively calculate i-th (i=l, 2 ..., N) plant amplitude range corresponding to, modulus value square average, obtain |, ^.When above-mentioned formula is applied, if, corresponding to i-th kind of amplitude range, correspondingly, just respectively there are N kinds correspondingly to take¾, Py。
In one embodiment, above-mentioned filter factor calculation expression can also be other modes, be specially：
^ = 0 |2„ ; 1. 7. 1
Wherein, ^ is Dynamic gene, and G is power normalization coefficient, wherein being specifically as follows：Mean power such as has been normalized, then<^ takes 1, does not normalize such as, then the inverse of mean power.
533rd, ^ and ^ are filtered, obtain filtered first-order filtering coefficient ^ and ^ χ;
W W W W
It should be noted that rightXJ;The processing mode filtered with ^, which can specifically be used, to be distinguished ^ and ^
W W
It is filtered（Can be average for sliding window, or other filtering）Processing, certainly can also be rightXJ;It is filtered simultaneously with ^, while during filtering process, J and ^ real part of symbol are on the contrary, the value of real part can be respectively specifically：(real (Wxy)-real (W x))/2 and-(real (Wxy)-real (W x))/2, with imaginary part symbol it is identical, imaginary part can be： (imag ( WXY) + imag ( w>^ ))/2 ;Wherein real () and imag () represent the real and imaginary parts of signal respectively.
534th, to input signal and progress delay process, the signal W synchronous with ^ and ^ X is obtainedXIWith
RyT, be then based on and, to RxtAnd RytIt is filtered and obtains final output and Ry'。
It should be noted that S34 filtering mode is specifically as follows：2*2-rank filtering；
The formula of above-mentioned 2*2-rank filtering is specifically as follows：
Rx = Rxt -^xyRyt 1.9 K=Ry t 1.10
Certainly in another embodiment, the formula of above-mentioned 2*2-rank filtering can also use other formula, for example：
Ry =Ryt+ xRxt L 12In addition, in formula 1.9 1 1.12W XJ^^, ^ symbol are only dependent upon ^ and ^ ^ symbol choosing
Below the compensation effect figure of final output signal with the inventive method come illustrate the present invention effect.
Fig. 5 is the compensation effect figure of the final output signal of the invention shown by taking PDM-QPSK systems as an example, wherein, annular region 51 is the planisphere before being compensated based on this nonlinear compensation scheme, annular region 52 is the planisphere after nonlinear compensation, it should be noted that, above-mentioned annular region 52 is located in annular region 51, and the present invention shows that annular region 52 and annular region 51 are just superimposed upon in a width figure by the scope of annular region for convenience, and Fig. 6 is similar with Fig. 5.From planisphere as can be seen that the planisphere after compensation converges to a narrower ring, there is more preferable signal quality, so it has more
Good gain and robustness.Further, since the method that the present invention is provided directly carries out modulus value square processing to signal, not using decision process（Sl icing), so influenceing the quality of signal without decision error, so its performance is high, signal quality is good, and especially in low 0SNR, effect is more obvious.
Fig. 6 is the compensation effect figure that the final output signal of the present invention is shown by taking PDM-16QAM systems as an example.It is distinguishing with PMD-QPSK systems to be, it is located on the signal constellation (in digital modulation) figure of 16QAM modulation on three rings, wherein, annular region 61,62,63 is the planisphere before being compensated based on this nonlinear compensation scheme, and annular region 64,65,66 is the planisphere after nonlinear compensation, it is necessary to which explanation is, annular region 64 is located in annular region 61, annular region 65 is located in annular region 62, and annular region 63 is located in annular region 66.From planisphere as can be seen that the planisphere after compensation converges to three narrower rings, with more preferable signal quality.
In addition, it is necessary to which explanation, the desired value of modulus value square, can take three different desired values (can also take identical desired value, performance can somewhat decline to reduce error to the constellation point on different rings）.
The present invention also provides a kind of nonlinear compensating device, and the device concrete structure is as shown in fig. 7, specifically include：With
It should be noted that the signal that above-mentioned and ^^ can input for X, Υ road.Filter factor computing module 72, for basis, R
Coefficient calculating is filtered, is obtained
W W
To first-order filtering coefficientXJ;And ^
W W τ τ ' filtration modules 73, for pairXJ;It is filtered with ^, obtains filtered first-order filtering coefficient xy and w time delay module 74, for input signal and progress delay process, obtains and ^^ and synchronous signal 7χίWith filtration module 75, for based on ^ and ^ ^ to ^χίBe filtered with ^ ^, obtain final output and
R
Or -1 X y, Wyx = CQ{Cx
Orxy
Wherein, * is represented and is taken complex conjugate, and7It is desired value, the desired value of modulus value square of modulus value square respectively,GIt is Dynamic gene, G is power normalization coefficient；It is neutralized, and the specific selection mode of value may refer to the explanation in embodiment of the method, repeat no more here.
Optionally, the filtering of filtration module 75 is specifically as follows 2*2-rank filtering, and 2*2-rank Filtering Formula is specifically as follows： =t yt、 Ry = Ryt -Wy'xRxt ;Or=+KRyt、 K = R yt + R XtIn addition, it is necessary to which the symbol in explanation, formula 1. 91 1. 12 is only dependent upon the symbol selection with ^ X.
Fig. 4 is a kind of concrete structure of nonlinear compensating device provided in an embodiment of the present invention, in the figure " I I2" represent to carry out the signal for being input to the module square processing of modulus value, " ten " represent adder, and " " represents that the processing of other parts in multiplier, the structure may refer to the associated description in embodiment above, and here is omitted.
The nonlinear compensating device that the present invention is provided carries out the signal after output compensation after nonlinear compensation to input signal, according to the planisphere of the signal after compensation（As Fig. 5,6) understand, the signal after compensation has preferable signal quality, have the advantages that increase system 0SNR surpluses.
The present invention also provides a kind of receiving system, and it is located at the receiving terminal of palarization multiplexing Transmission system, and for receiving the palarization multiplexing optical signal that the transmitting terminal of the palarization multiplexing Transmission system is sent, the receiving system includes above-mentioned nonlinear compensating device.The palarization multiplexing optical signal that the receiving system is received is converted into analog electrical signal after being handled by coherent reception, then analog electrical signal is converted into by data signal by analog-to-digital conversion again, then carries out processing to above-mentioned data signal to recover the data carried on palarization multiplexing optical signal using Digital Signal Processing.Wherein, the processing that the nonlinear compensating device in the present invention is carried out is exactly a link in above-mentioned Digital Signal Processing, and after its processing, the quality of signal is improved, so that the data recovered have the less bit error rate.
It should be noted that the receiving system that the present invention is provided is not intended to limit particular location of the nonlinear compensating device in system, the particular location of nonlinear compensating device is illustrated below by specific embodiment, the nonlinear compensating device can be located at institute
State in the digital signal processor of receiving system.
For convenience of description, nonlinear compensating device is referred to as by specific embodiment below： NLC (Nonlinear compensation) .
The present invention provides an embodiment, the present embodiment provides a kind of receiving system, and the receiving system includes the nonlinear compensating device described in embodiment above, and its concrete structure is as shown in Figure 8, wherein, NLC can be located at before carrier phase recovery module.The receiving system that the present embodiment is provided can also specifically include in addition to comprising NLC：Chromatic dispersion CD compensating modules, for carrying out CD compensation to signal；Clock recovery module, for carrying out clock recovery processing to signal；PMD compensating modules, the PMD for thermal compensation signal;Carrier phase recovery module, the carrier phase for recovering signal；Decoder, for carrying out entering signal row decoding processing.Wherein, the annexation of above-mentioned each module is as shown in Figure 8, the output of CD compensating modules is the input of clock recovery module, the output of clock recovery module is the input of PMD compensating modules, the output of PMD compensating modules is NLC input, NLC output is the input of carrier phase recovery module, and the output of carrier phase recovery module is the input of decoder.
The system that the present embodiment is provided is as a result of NLC, so it has the advantages that to improve signal quality, that is, has the advantages that the 0SNR surpluses for increasing system.
The present invention provides another embodiment, the present embodiment provides a kind of receiving system, the receiving system includes the nonlinear compensating device described in embodiment above, its concrete structure is as shown in Figure 9, it is with the difference of the receiving system of structure shown in Fig. 8, after NLC position adjustment to carrier phase recovery, i.e. NLC can be located at after carrier phase recovery.In the present embodiment, the annexation of modules is as shown in Figure 9, the output of CD compensating modules is the input of clock recovery module, the output of clock recovery module is the input of PMD compensating modules, the output of PMD compensating modules is the input of carrier phase recovery module, the output of carrier phase recovery module is NLC input, and NLC output is the input of decoder.
The present invention provides another embodiment, the present embodiment provides a kind of receiving system, the receiving system includes the nonlinear compensating device described in two above embodiment, its concrete structure is as shown in Figure 10, it is with the difference of the receiving system of structure shown in Fig. 8, a NLC is also add after carrier phase recovery, i.e., respectively has a NLC after carrier phase and before.In the present embodiment, the annexation of modules is as shown in Figure 10, the output of CD compensating modules is the input of clock recovery module, the output of clock recovery module is the input of PMD compensating modules, the output of PMD compensating modules is the first NLC input, first NLC output is the input of carrier phase recovery module, and the output of carrier phase recovery module is the 2nd NLC input, and the 2nd NLC output is the input of decoder.
The present invention provides next embodiment, the present embodiment provides a kind of receiving system, the receiving system includes the nonlinear compensating device described in two above embodiment, its concrete structure is as shown in figure 11, it is with the difference of the receiving system of structure shown in Figure 10, can (J estimations that NLC and maximum likelihood sequence is bad（Maximum likelihood sequence estimation, MLSE) module combination, i.e., on the basis of the receiving system of structure shown in Figure 10, MLSE is increased after latter NLC.In the present embodiment, the annexation of modules is as shown in figure 11, the output of CD compensating modules is the input of clock recovery module, the output of clock recovery module is the input of PMD compensating modules, the output of PMD compensating modules is the first NLC input, first NLC output is the input of carrier phase recovery module, the output of carrier phase recovery module is the 2nd NLC input, 2nd NLC output is the input of MLSE modules, and the output of MLSE modules is the input of decoder.Wherein, the signal that MLSE modules are exported to the first NLC carries out maximum-likelihood sequence estimation processing, linear damage, nonlinear impairments, narrow-band filtering damage of device that the processing can be undergone with thermal compensation signal etc..
The present invention provides latter embodiment, and the present embodiment provides a kind of receiving system, and the receiving system includes real above
The nonlinear compensating device described in example is applied, its concrete structure as shown in figure 12, is, the receiving system in the present embodiment does not have carrier phase recovery module with the difference of the receiving system of structure shown in Fig. 8.Can be in CPE free (carrierfree phase recovery units）In the case of realize signal receive, to improve the non-linear of CPE free systems.In the present embodiment, as shown in figure 12, the output of CD compensating modules is the input of clock recovery module to the annexation of modules, and the output of clock recovery module is the input of PMD compensating modules, the output of PMD compensating modules is NLC input, and NLC output is the input of decoder.
Modules in structure shown in Fig. 8-12 can be located in digital signal processor.In said apparatus and system embodiment, included modules or unit are simply divided according to function logic, but are not limited to above-mentioned division, as long as corresponding function can be realized；In addition, the specific name of each functional module is also only to facilitate mutually distinguish, the protection domain being not intended to limit the invention.Chromatic dispersion compensating module, clock recovery module, polarization mode dispersion (PMD) compensation module, carrier phase recovery module, maximum-likelihood sequence estimation module and decoder above described in embodiment can be realized using prior art, therefore be repeated no more in this application.
It will be understood by those skilled in the art that in compensation of nonlinearity method provided in an embodiment of the present invention, its all or part of step can be by the related hardware of programmed instruction to complete.It can such as be completed by computer runs programs.The program can be stored in read/write memory medium, for example, random access memory, disk, CD etc..
Claims (1)
- Claims1st, a kind of compensation of nonlinearity method, it is characterised in that methods described includes:Square of input signal and ^ ^ modulus value is calculated respectively, is obtained ；Wherein, specially correspond to the electric signal of X polarization state light signals in palarization multiplexing optical signal, specially correspond to the electric signal of Y polarization state light signals in polarisation-multiplexed signal, X polarization state light signals and Y polarization state light signals are a pair of mutually orthogonal optical signals；According to,WPair and ^ be filtered, obtain filtered first-order filtering coefficient ^ and ^^;Carry out delay process to input signal and respectively, obtain with ^JX synchronous signal xt and R respectivelyyt, be then based on and, to RxtAnd RytBe filtered, obtain final output and.2nd, according to the method described in claim 1, it is characterised in that the filter factor is calculated and specifically included： Or=c.( | — 1 y、、 w yyxx = cQ{cx R Wherein, * is represented and is taken complex conjugate, and is the desired value of modulus value square, is the desired value of modulus value square,gIt is Dynamic gene, G is power normalization coefficient.3rd, method according to claim 2, it is characterised in that the average of the average, specially modulus value square for being specially modulus value square；Or, the and be specially modulus value square and ^ modulus value square and average.4th, according to the method in claim 2 or 3, if characterized in that, the palarization multiplexing optical signal is specially the am signals of palarization multiplexing, and the am signals are when having N kind amplitude ranges, described and i | there are N kind values Based on corresponding to i-th kind of amplitude range, RV, obtain PyAnd il, corresponding to the value of i-th kind of amplitude range, wherein, N is integer more than or equal to 2, i=l, 2, →.5th, the method according to any one of claim 1 to 4, it is characterised in that it is described be based on ^ and ^ x, pair and RYTIt is filtered and obtains final outputR xWithR ySpecially-R x = R xt W x'y R yt t R y = R yt-W y'x R xtf \i x = R xt+W x'y R yt t y = R yt+W y'x R xt†6th, a kind of nonlinear compensating device, it is characterised in that the unit includes：Mould squaring module, square of the modulus value for calculating input signal and ^ ^ respectively, is obtainedWherein, the electric signal specially corresponding to X polarization state light signals in polarisation-multiplexed signal, the specially electric signal corresponding to Y polarization state light signals in polarisation-multiplexed signal, X polarization state light signals and Y polarization state light signals are a pair of mutually orthogonal optical signals；Filter factor computing module, for basis, R Calculated with coefficient is filtered, obtain-W WRank filter factorXJ;With ^ rank filtration modules, for W andyXIt is filtered,Synchronous signal ^ and ^ filtration module, for based on ^ y and ^yx, to RXTAnd RVTIt is filtered, obtains final outputR xWithR7th, device according to claim 6, it is characterised in that the formula that the filter factor computing module is filtered coefficient calculating is specifically included： Or=c. (ς \RX 2 - I)RXR;、 wvx = c0 (q R 2- 1) ^:； OrxyWherein, * is represented and is taken complex conjugate, is the desired value of modulus value square, is the desired value of modulus value square,GIt is Dynamic gene, G is power normalization coefficient.8th, the device according to claim 6 or 7, it is characterised in that the filtration module is specifically for xy and-Ti-i ^ yx and 7χίWithzIt is filtered and obtains final output RXWith the formula of the filtering is specially：R x = R xt W x'y R yt t R y = R yt-W y'x R xtf \i x = R xt+W x'y R yt t y = R yt+W y'x R xt†9th, a kind of receiving system, it is characterized in that, the receiving system is located at the receiving terminal of palarization multiplexing Transmission system, for receiving the palarization multiplexing optical signal that the transmitting terminal of palarization multiplexing Transmission system is sent, the reception system includes the nonlinear compensating device as described in claim 6-8 is any.10th, receiving system according to claim 9, it is characterised in that the receiving system is still further comprised：Chromatic dispersion CD compensating modules, clock recovery module, polarization mode dispersion PMD compensating modules, carrier phase recovery module and decoder；Wherein, the palarization multiplexing optical signal is converted into data signal after treatment in the receiving system, the CD compensating modules carry out CD compensation to the data signal and are output to the clock recovery module, the clock recovery module carries out clock recovery to the signal exported by the CD compensating modules and is output to the PMD compensating modules, the signal that the PMD compensating modules are exported to the clock recovery module carries out PMD compensation and is output to the carrier phase recovery module, the signal that the carrier phase recovery module is exported to the PMD compensating modules carries out carrier phase recovery and is output to the nonlinear compensating device, the signal that the nonlinear compensating device is exported to the carrier phase recovery module carries out nonlinear compensation and is output to decoder, the signal that the decoder is exported to the nonlinear compensating device enters row decoding and handles and export decoding result.11st, receiving system according to claim 9, it is characterised in that the receiving system is still further comprised：Chromatic dispersion CD compensating modules, clock recovery module, polarization mode dispersion PMD compensating modules, carrier phase recovery module and decoder；Wherein, the palarization multiplexing optical signal is converted into data signal after treatment in the receiving system, the CD compensating modules carry out CD compensation to the data signal and are output to the clock recovery module, the clock recovery module carries out clock recovery to the signal exported by the CD compensating modules and is output to the PMD compensating modules, the PMD compensating modules pair The signal of the clock recovery module output carries out PMD compensation and is output to the nonlinear compensating device, the signal that the nonlinear compensating device is exported to the PMD compensating modules carries out nonlinear compensation and is output to the carrier phase recovery module, the signal that the carrier phase recovery module is exported to the nonlinear compensating device carries out carrier phase recovery and is output to the decoder, and the signal that the decoder is exported to the decoder enters row decoding and handles and export decoding result.12nd, receiving system according to claim 9, it is characterised in that the receiving system is still further comprised：Chromatic dispersion CD compensating modules, clock recovery module, polarization mode dispersion PMD compensating modules and decoder；Wherein, the palarization multiplexing optical signal is converted into data signal after treatment in the receiving system, the CD compensating modules carry out CD compensation to the data signal and are output to the clock recovery module, the clock recovery module carries out clock recovery to the signal exported by the CD compensating modules and is output to the PMD compensating modules, the signal that the PMD compensating modules are exported to the clock recovery module carries out PMD compensation and is output to the nonlinear compensating device, the signal that the nonlinear compensating device is exported to the PMD compensating modules carries out nonlinear compensation and is output to decoder, the signal that the decoder is exported to the nonlinear compensating device enters row decoding and handles and export decoding result.13rd, a kind of receiving system, it is characterized in that, the receiving system is located at the receiving terminal of palarization multiplexing Transmission system, for receiving the palarization multiplexing optical signal that the transmitting terminal of palarization multiplexing Transmission system is sent, the receiving system includes the nonlinear compensating device two as described in claim 6-8 is any, and the receiving system is still further comprised：Chromatic dispersion CD compensating modules, clock recovery module, polarization mode dispersion PMD compensating modules, carrier phase recovery module and decoder；Wherein, the palarization multiplexing optical signal is converted into data signal after treatment in the receiving system, the CD compensating modules carry out CD compensation to the data signal and are output to the clock recovery module, the clock recovery module carries out clock recovery to the signal exported by the CD compensating modules and is output to the PMD compensating modules, the PMD compensating modules carry out PMD compensation to the signal of the first clock recovery module output and are output to first nonlinear compensating device, the signal that first nonlinear compensating device is exported to the PMD compensating modules carries out nonlinear compensation and is output to the carrier phase recovery module, the carrier phase recovery module carries out carrier phase recovery to the signal of the first nonlinear compensating device output and is output to second nonlinear compensating device, the signal that second nonlinear compensating device is exported to the carrier phase recovery module carries out nonlinear compensation and is output to decoder, the decoder enters row decoding to the signal of the second nonlinear compensating device output and handles and export decoding result.14th, a kind of receiving system, it is characterized in that, the receiving system is located at the receiving terminal of palarization multiplexing Transmission system, for receiving the palarization multiplexing optical signal that the transmitting terminal of palarization multiplexing Transmission system is sent, the receiving system includes the nonlinear compensating device two as described in claim 6-8 is any, and described device is still further comprised：Chromatic dispersion CD compensating modules, clock recovery module, polarization mode dispersion PMD compensating modules, carrier phase recovery module, maximum-likelihood sequence estimation module and decoder；Wherein, the palarization multiplexing optical signal is converted into numeral after treatment in the receiving system Signal, the CD compensating modules carry out CD compensation to the data signal and are output to the clock recovery module, the clock recovery module carries out clock recovery to the signal exported by the CD compensating modules and is output to the PMD compensating modules, the PMD compensating modules carry out PMD compensation to the signal of the first clock recovery module output and are output to first nonlinear compensating device, the signal that first nonlinear compensating device is exported to the PMD compensating modules carries out nonlinear compensation and is output to the carrier phase recovery module, the signal that the carrier phase recovery module is exported to the nonlinear compensating device carries out carrier phase recovery and is output to second nonlinear compensating device, the signal that second nonlinear compensating device is exported to the carrier phase recovery module carries out being processed and output to the maximum-likelihood sequence estimation module, the maximum-likelihood sequence estimation module carries out maximum-likelihood sequence estimation to the signal of the second nonlinear compensating device output and is processed and output to decoder, the signal that the decoder is exported to the maximum-likelihood sequence estimation module enters row decoding and handles and export decoding result.
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| WO2016115996A1 (en) * | 2015-01-20 | 2016-07-28 | 中兴通讯股份有限公司 | Non-linear compensation method and device |
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| CN1682472A (en) * | 2002-09-17 | 2005-10-12 | 西门子公司 | Method for the transmission of optical polarization multiplex signals |
| CN1691503A (en) * | 2004-04-20 | 2005-11-02 | 三洋电机株式会社 | Digital filter apparatus and filter processing method thereof |
| CN1977477A (en) * | 2004-03-09 | 2007-06-06 | 爱立信股份有限公司 | System, method and apparatus for polarization mode dispersion compensation and demultiplexing polarization multiplexed signals |
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| JP2005006151A (en) * | 2003-06-13 | 2005-01-06 | Nippon Telegr & Teleph Corp <Ntt> | Nonlinear filter circuit |
| CN101453268B (en) * | 2007-12-06 | 2013-11-06 | 北京高光科技有限公司 | Optical communication system based on polarization multiplex technique and method thereof |
| CN102100024B (en) * | 2008-11-28 | 2014-03-26 | 富士通株式会社 | Apparatus and method for monitoring statistical characteristics of phase noises, and coherent optical communication receiver |
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| CN1682472A (en) * | 2002-09-17 | 2005-10-12 | 西门子公司 | Method for the transmission of optical polarization multiplex signals |
| CN1977477A (en) * | 2004-03-09 | 2007-06-06 | 爱立信股份有限公司 | System, method and apparatus for polarization mode dispersion compensation and demultiplexing polarization multiplexed signals |
| CN1691503A (en) * | 2004-04-20 | 2005-11-02 | 三洋电机株式会社 | Digital filter apparatus and filter processing method thereof |
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| WO2016115996A1 (en) * | 2015-01-20 | 2016-07-28 | 中兴通讯股份有限公司 | Non-linear compensation method and device |
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