CN1244994C - Method of dispersion compensation of polarization module in high-speed optical-fiber communication - Google Patents
Method of dispersion compensation of polarization module in high-speed optical-fiber communication Download PDFInfo
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- CN1244994C CN1244994C CNB031376428A CN03137642A CN1244994C CN 1244994 C CN1244994 C CN 1244994C CN B031376428 A CNB031376428 A CN B031376428A CN 03137642 A CN03137642 A CN 03137642A CN 1244994 C CN1244994 C CN 1244994C
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- optical fiber
- time delay
- pass filter
- variable differential
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Abstract
The present invention belongs to a method for the dispersion compensation of polarization module colors in high-speed optical fiber communication. A variable differential time delay device in a polarization module color dispersion compensator is used as a variable differential time delay line to be used for compensating the time delay of an optical signal differential group, and a photoelectric detection pipe changing optical signals into microwave signals and a band-pass filter filtering out needed frequency component for monitoring are connected in series in the polarization module color dispersion compensator and communication optical fibers; a program comprising a particle group optimization algorithm formula is input into a computer which reads the comparison of the peak power and the threshold value of the band-pass filter in an optical fiber transmission line. If the read peak power of the band-pass filter is smaller than the threshold value in the optical fiber transmission line, the computer generates input and control voltage for an electric control polarization controller and control signals for the variable differential time delay line by the particle group optimization algorithm formula in the program. The electric control polarization controller and the variable differential time delay line are respectively controlled, and compensation is automatically completed when the peak power in the optical fiber transmission line achieved the threshold value.
Description
Technical field
The invention belongs to the method for polarization mode dispersion (PMD) compensation in a kind of high speed optical fiber communication.
Background technology
Communication optical fiber with the quartz glass manufacturing, because a variety of causes causes the oval core diameter of the destructurized one-tenth of circular symmetry in the optical fiber, produce non-round stress symmetric, the result makes that the group velocity of two orthogonal polarization modes is inconsistent, and this phenomenon is called polarization mode dispersion.Because polarization mode dispersion forms the fast axle 2 and the slow axis 1 (as shown in Figure 1) that transmit signal in every optical fiber, make two orthogonal polarization state signals arrive the asynchronism(-nization) of receiving terminal, promptly produces delay inequality.In the high speed fibre transmission system greater than 10Gb/s, the previous optical fiber of laying is because polarization mode dispersion is bigger, thereby therefore the error rate of increase transfer of data must compensate this.The existing polarized mode dispersion compensation method that is used for is it to be compensated with polarization mode dispersion compensator at signal receiving end, compensation is to realize by the polarization angle of manual adjustments polarization mode dispersion compensator change light signal, and polarization mode dispersion has randomness and variability in the optical fiber, present compensation method is difficult to effectively, fast the polarization mode dispersion device is adjusted, and can not realize compensating effectively and rapidly.
Summary of the invention
The method that the purpose of this invention is to provide polarization mode dispersion (PMD) compensation in a kind of high speed optical fiber communication, can make things convenient for, effectively, polarization mode dispersion in the compensated fiber promptly, thereby increase substantially the accuracy rate of transfer of data.For this reason, the method of polarization mode dispersion (PMD) compensation in a kind of high speed optical fiber communication of the present invention, be the fiber-optic signal receiving terminal with polarization mode dispersion compensator to telecommunication optical fiber in the polarization dispersion of signal compensate, described polarization mode dispersion compensator is made of the automatically controlled Polarization Controller and the variable differential time delay device of series connection.Described method comprises the steps
(1) the variable differential time delay device in the polarization mode dispersion compensator is the variable differential line of time delay, be used for the compensated optical signal Differential Group Delay, polarization mode dispersion compensator with in be provided with and light signal is converted into the Photoelectric Detection pipe of microwave signal and will required frequency component leaches for the band pass filter of monitoring, computer reads the signal of band pass filter;
(2) import the program that contains the particle swarm optimization algorithm formula in computer, the described particle swarm optimization algorithm formula that contains is: V
Id=ω * V
Id+ C
1* rand () * (P
Id-X
Id)+C
2* rand () * (G
d-X
Id)
X
id＝X
id+V
id；
V
IdBe particle's velocity, ω is a weight factor, C
1, C
2Be the study factor, X
IdBe the current position of particle, P
IdBe self present optimum position of particle, G
dBe the present optimum position of colony's particle, rand () is a random number;
(3) before the compensation, the computer search band pass filter obtains the largest peaks power of optical fiber transmission line, and with the threshold value of this peak power as program;
(4) after the compensation beginning, computer reads the peak power of band pass filter in the optical fiber transmission line and threshold ratio, if read the peak power of band pass filter in the optical fiber transmission line less than threshold value, then computer produces to the input control voltage of automatically controlled Polarization Controller with to the control signal of variable differential line of time delay according to the particle swarm optimization algorithm formula in the program, when controlling automatically controlled Polarization Controller and variable differential line of time delay respectively and making peak power in the optical fiber transmission line reach threshold value, finish compensation automatically.The said structure design has realized purpose of the present invention.
Advantage of the present invention is the multiple degrees of freedom of adaptive polarization mode dispersion, and ability of searching optimum is strong, easily and effectively the delay inequality of compensating polarization mode dispersion generation promptly, and Noise Resistance Ability is good, fast convergence rate, compensation effect is good, thereby reduces the error rate of transfer of data greatly.
Description of drawings
Fig. 1 is that polarization mode dispersion produces schematic diagram in the Optical Fiber Transmission
Fig. 2 is the principle schematic of collocation structure of the present invention
Fig. 3 is a workflow diagram of the present invention
Embodiment
As shown in Figure 1, communication optical fiber with quartz glass is made because a variety of causes causes the oval core diameter of the destructurized one-tenth of circular symmetry in the optical fiber, produces non-round stress symmetric, the group velocity that the result makes two orthogonal polarizations touch is inconsistent, and this phenomenon is called polarization mode dispersion.Because polarization mode dispersion forms the fast axle 2 and the slow axis 1 that transmit signal in every optical fiber, make two orthogonal polarization state signals arrive the asynchronism(-nization) of receiving terminal, promptly produces delay inequality 3.In the high speed fibre transmission system greater than 10Gb/s, the previous optical fiber of laying is because polarization mode dispersion is bigger, thereby therefore the error rate of increase transfer of data must compensate this.
As shown in Figure 2, the present invention is the method for polarization mode dispersion (PMD) compensation in a kind of high speed optical fiber communication, the fiber-optic signal receiving terminal with 9 pairs of telecommunication optical fibers of polarization mode dispersion compensator in the polarization dispersion of signal compensate, described polarization mode dispersion compensator is made of the automatically controlled Polarization Controller 4 and the variable differential time delay device of two series connection.Variable differential time delay device in the polarization mode dispersion compensator is a variable differential line of time delay 5, be used for the compensated optical signal Differential Group Delay, in polarization mode dispersion compensator, be provided with light signal is converted into the Photoelectric Detection pipe 6 of microwave signal and required frequency component is leached band pass filter 7 for monitoring.Computer 8 reads the signal of Photoelectric Detection pipe and band pass filter, and (program that contains particle swarm optimization algorithm of input is a traditional program to import the program that contains the particle swarm optimization algorithm formula in computer.I particle defines its position coordinates in hyperspace
And speed
D is the hyperspace dimension, or polarization mode dispersion compensator control degrees of freedom number.Component is all control physical quantitys of compensator in the particle coordinate, such as the control voltage of control Polarization Controller and the control voltage of variable differential line of time delay.Each particle upgrades own position in hyperspace according to the feedback signal that reads by iteration, in each step iteration, i particle upgrades the position of oneself according to the following particle swarm optimization algorithm formula that contains), the described particle swarm optimization algorithm formula that contains is:
V
id＝ω×V
id+C
1×rand()×(P
id-X
id)+C
2×rand()×(G
d-X
id)
X
id＝X
id+V
id；
V
IdBe particle's velocity, ω is a weight factor, C
1, C
2Be the study factor, X
IdBe the current position of particle, P
IdBe self present optimum position of particle, G
dBe the present optimum position of colony's particle, rand () be random number (ω is a weight factor, and when its value was big, the iteration span was big, helps global search, its value hour, the iteration span is little, helps fine search.General such arrangement, in the search iteration process, ω is from 1 linear decrease to 0.4.P
IdBe the optimum position coordinate that particle self finds so far, its influence to the particle position iteration is the influence that self learns.Gd is the optimum position that colony's particle finds at present, and its influence to the particle position iteration is the influence of colony's study.C
1Be self study factor, C
2Be colony's study factor, require C
1+ C
2＞4.Such as selecting C
1=C
2=2.05, it is identical that degree of influence is learnt by study this moment self and colony.Or C
1=2.8, C
2=1.3, study this moment self degree of influence is greater than colony's study influence).
As shown in Figure 3, because the instability of environmental change and device, the peak power of light signal can change in time in the transmission line, and this gives the maximum comparison value of determining in the program is that threshold power brings difficulty.So before the compensation, the computer search band pass filter obtains the largest peaks power of optical fiber transmission line, and with the threshold value of this peak power as program; After the compensation beginning, computer reads the peak power of band pass filter in the optical fiber transmission line and threshold ratio, if read the peak power of band pass filter in the optical fiber transmission line less than threshold value, then computer produces to the input control voltage of automatically controlled Polarization Controller with to the control signal of variable differential line of time delay according to the program that contains the particle swarm optimization algorithm formula, when controlling automatically controlled Polarization Controller and variable differential line of time delay respectively and making peak power in the optical fiber transmission line reach threshold value, finish compensation automatically.Computer is according to the program that contains the particle swarm optimization algorithm formula, light signal peak power in the search transmission line, and the input control voltage of adjustment control Polarization Controller, make peak power reach maximum, this moment, the time delay minimum started whether minimum of change value that tracking sampling program in this program judges peak power; If, this moment, global maximum power peak did not float, and still among monitoring, only needed (to be traditional program with the simple jitter tracing that contains in this program, polarization mode dispersion process in the compensated fiber transmission line is actually according to the feedback power signal, the process of search maximum peak power.Like this, following the tracks of the polarization mode dispersion that constantly changes promptly is the process of following the tracks of the peak power of this drift.The shake of multidimensional Control Parameter is followed the tracks of and is difficult to graphic, if the feedback power signal has a maximum with the control change in voltage, when polarization mode dispersion changes, peak power has been drifted about, very the left and right sides, zonule wobble variation is controlled voltage near former Optimal Control magnitude of voltage, just can find the peak that has drifted about fast, reach the tracking Control purpose.Less when power change value, the peak of its drift is within jitter range, among tracing and monitoring.When power change value is bigger, the peak power position floats, and shake is followed the tracks of and can't be come into force, and need search for optimum again, restarts program.The program that contains the program of particle swarm optimization algorithm formula and contain the simple jitter tracing is two parts of whole program of the present invention), just can compensate the time delay of less variation.If not, oneself is not the optimum of delay compensation for the peak power that search this moment previously, and global maximum power peak floats, need search for optimum again, restarts program.
In a word, self adaptation polarization mode dispersion compensating method advantage of the present invention is a multiple degrees of freedom, ability of searching optimum is strong, the delay inequality that compensated fiber polarization mode dispersion promptly easily and effectively produces, and Noise Resistance Ability is good, fast convergence rate, and compensation effect is good, thereby reduce the error rate of transfer of data greatly, improve the accuracy rate of transfer of data.
Claims (1)
1, the method for polarization mode dispersion (PMD) compensation in a kind of high speed optical fiber communication, the fiber-optic signal receiving terminal with polarization mode dispersion compensator to telecommunication optical fiber in the polarization dispersion of signal compensate, described polarization mode dispersion compensator is made of the automatically controlled Polarization Controller and the variable differential time delay device of series connection, it is characterized in that described method comprises the steps
(1) the variable differential time delay device in the polarization mode dispersion compensator is the variable differential line of time delay, be used for the compensated optical signal Differential Group Delay, in polarization mode dispersion compensator, be provided with light signal be converted into microwave signal the Photoelectric Detection pipe and with required frequency component leach for the monitoring band pass filter, computer reads the signal of Photoelectric Detection pipe and band pass filter;
(2) import the program that contains the particle swarm optimization algorithm formula in computer, the described particle swarm optimization algorithm formula that contains is: V
Id=ω * V
Id+ C
1* rand () * (P
Id-X
Id)+C
2* rand () * (G
d-X
Id) X
Id=X
Id+ V
Id
V
IdBe particle's velocity, ω is a weight factor, C
1, C
2Be the study factor, X
IdBe the current position of particle, P
IdBe self present optimum position of particle, G
dBe the present optimum position of colony's particle, rand () is a random number;
(3) before the compensation, the computer search band pass filter obtains the largest peaks power of optical fiber transmission line, and with the threshold value of this peak power as program;
(4) after the compensation beginning, computer reads the peak power of band pass filter in the optical fiber transmission line and threshold ratio, if read the peak power of band pass filter in the optical fiber transmission line less than threshold value, then computer produces to the input control voltage of automatically controlled Polarization Controller with to the control signal of variable differential line of time delay according to the particle swarm optimization algorithm formula in the program, when controlling automatically controlled Polarization Controller and variable differential line of time delay respectively and making peak power in the optical fiber transmission line reach threshold value, finish compensation automatically.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031376428A CN1244994C (en) | 2003-06-09 | 2003-06-09 | Method of dispersion compensation of polarization module in high-speed optical-fiber communication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031376428A CN1244994C (en) | 2003-06-09 | 2003-06-09 | Method of dispersion compensation of polarization module in high-speed optical-fiber communication |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1455528A CN1455528A (en) | 2003-11-12 |
| CN1244994C true CN1244994C (en) | 2006-03-08 |
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|---|---|---|---|
| CNB031376428A Expired - Fee Related CN1244994C (en) | 2003-06-09 | 2003-06-09 | Method of dispersion compensation of polarization module in high-speed optical-fiber communication |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100370715C (en) * | 2003-11-18 | 2008-02-20 | 北京邮电大学 | Adaptive polarization mode dispersion compensation arrangement |
| US7454092B2 (en) | 2006-10-24 | 2008-11-18 | Kailight Photonics, Inc. | Systems and methods for polarization mode dispersion mitigation |
| CN101453274B (en) * | 2007-11-30 | 2012-04-04 | 华为技术有限公司 | Method and apparatus for suppressing noise |
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2003
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| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Jiangsu Fiber Grid Co., Ltd. Assignor: Beijing University of Posts and Telecommunications Contract record no.: 2010990000624 Denomination of invention: Method of dispersion compensation of polarization module in high-speed optical-fiber communication Granted publication date: 20060308 License type: Exclusive License Open date: 20031112 Record date: 20100810 |
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Granted publication date: 20060308 Termination date: 20110609 |