CN102223184B - Dispersion compensation method and device - Google Patents
Dispersion compensation method and device Download PDFInfo
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- CN102223184B CN102223184B CN201110175352.7A CN201110175352A CN102223184B CN 102223184 B CN102223184 B CN 102223184B CN 201110175352 A CN201110175352 A CN 201110175352A CN 102223184 B CN102223184 B CN 102223184B
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Abstract
The invention discloses a kind of dispersion compensation method and device, wherein, dispersion compensation method includes：Obtain under different TDC dispersion values, the feedback signal value of P/T module；Feedback signal value is carried out curve fitting, dispersion adjusted value is obtained；Dispersion adjustment is carried out to TDC dispersion values according to dispersion adjusted value.Pass through the present invention, the problem of TDC dispersions are adjusted roughly can not be realized using balanced reciver peak signal contrast by solving the service board based on polarization tracking technology in current optical transmission network, and then reached the demultiplexing for realizing polarised light, when P/T module is not demultiplexed to polarization optics, the effect of TDC rough adjustment also can be effectively realized.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of dispersion compensation method and device.
Background technology
In wavelength-division long range transmitting procedure, because of many factors such as environment, optical fiber, equipment, system is caused to produce effect of dispersion.
Although each transmission website can be improved using partial dispersion compensation technology, entire compensation is inaccurate.However, for high-speed
The optical channel equipment of transmission, such as unicast 40G or 100G equipment, can not work without special dispersion compensation unit, because
The equipment of this chromatic dispersion compensating function is essential.
Existing DQPSK (Differential Quadrature Phase Shift Keying, differential quadrature phase shift key
Control) modulation under, dispersion compensation technology mainly uses balanced reciver peak signal contrast to realize TDC (dispersion compensation adjustment)
Dispersion adjust roughly, then search for the minimum value of balanced reciver peak signal, find ± 45 degree of DLI (Delay Line
Interferometer, delay line interferometer) coarse phase, it is finally micro- successively using error code information before the error correction of framer offer
TDC dispersions and fine setting DLI phases are adjusted, finally realizes that TDC dispersions fix optimal, and DLI phases persistently track fine setting.
For PM-DQPSK, i.e. palarization multiplexing-difference quadrature phase shift keying modulation system, receiving terminal using delayed interference and
Balance reception realizes signal detection.Because input signal is 2 tunnel polarization state signals, 2 need to be isolated using optical polarization tracking technique
The DQPSK signals of road polarized orthogonal.Polarization tracking (PT) module that optical polarization tracking technique is used is needed in certain color
The crosstalk between two polarised lights could be reduced by dissipating in scope, and two polarised lights are separated.It is unreal in PT (bias voltage tracking) module
During existing polarization optics demultiplexing, balanced reciver peak signal is unavailable, cannot also utilize balanced reciver peak signal pair
The rough adjustment of TDC dispersions is realized than degree, dispersion compensation cannot be also realized.
The content of the invention
It is a primary object of the present invention to provide a kind of dispersion compensation method and device, passed with least solving above-mentioned current light
Service board based on polarization tracking technology in defeated networking can not realize TDC dispersions using balanced reciver peak signal contrast
The problem of rough adjustment.
According to an aspect of the invention, there is provided a kind of dispersion compensation method, including：Obtain in different TDC dispersion values
Under, the feedback signal value of P/T module；Feedback signal value is carried out curve fitting, dispersion adjusted value is obtained；According to dispersion adjusted value
Dispersion adjustment is carried out to TDC dispersion values.
Preferably, obtaining under different dispersion compensations adjustment TDC dispersion values, the feedback signal value of bias voltage tracking P/T module
The step of after, in addition to：Under the dispersion point for abandoning the setpoint distance for deviateing actual dispersion value, the feedback signal value of P/T module.
Preferably, under the dispersion point for abandoning the setting quantity for deviateing actual dispersion value, the step of the feedback signal value of P/T module
Suddenly include：Centered on the dispersion point of minimum value in TDC dispersion values, left and right respectively takes continuous 4 dispersion points, obtains continuous 9
Individual dispersion point；The feedback signal value of P/T module under 9 dispersion points is obtained, the feedback signal of P/T module under other dispersion points is abandoned
Value.
Preferably, feedback signal value is carried out curve fitting, the step of obtaining dispersion adjusted value includes：Compare feedback signal
Value, finds minimum point as center；Respectively take the point of the first setting quantity to carry out binomial fitting at the center or so, obtain first
Matched curve；Centered on the minimum point of the first matched curve, the point of the second setting quantity is respectively taken to carry out height at the center or so
This fitting, obtains the second matched curve；According to the second matched curve, dispersion adjusted value is obtained.
Preferably, obtain under different dispersion compensations adjustment TDC dispersion values, the feedback signal value of bias voltage tracking P/T module
Step includes：Using 100 ps/nms as step-length, the dispersion values in whole threshold range are adjusted；Clicked through in each adjustment
The collection of the feedback signal value of row P/T module.
Preferably, obtaining under different dispersion compensations adjustment TDC dispersion values, the feedback signal value of bias voltage tracking P/T module
The step of after, in addition to：At interval of 1 millisecond, 1000 feedback signal values are read from Serial Peripheral Interface SPI；To reading
1000 feedback signal values taken are averaged, and the feedback signal value after obtaining averagely is used as final feedback signal value.
Preferably, the dispersion compensation method is applied to the 100G optical transports of polarization tracking.
According to another aspect of the present invention there is provided a kind of dispersion compensation device, including：Main control module and TDC modules, its
In, main control module, including：Feedback signal module, for obtaining under different TDC dispersion values, the feedback signal value of P/T module；It is bent
Line fitting module, for being carried out curve fitting to feedback signal value, obtains dispersion adjusted value, and be sent to TDC modules；TDC moulds
Block, for carrying out dispersion adjustment to TDC dispersion values according to dispersion adjusted value.
Preferably, main control module also includes：Module is abandoned, is adjusted for being obtained in feedback signal module in different dispersion compensations
Under whole TDC dispersion values, after the feedback signal value of bias voltage tracking P/T module, the color for the setpoint distance for deviateing actual dispersion value is abandoned
Under scatterplot, the feedback signal value of P/T module.
Preferably, abandoning module is used to obtain under different dispersion compensations adjustment TDC dispersion values in feedback signal module, partially
After the feedback signal value for putting tracking P/T module, centered on the dispersion point of minimum value in TDC dispersion values, left and right respectively takes continuously
4 dispersion points, obtain continuous 9 dispersion points；The feedback signal value of P/T module under 9 dispersion points is obtained, other dispersions are abandoned
The feedback signal value of the lower P/T module of point.
Preferably, curve fitting module includes：First fitting module, for comparing feedback signal value, finds minimum point work
Centered on；Respectively take the point of the first setting quantity to carry out binomial fitting at the center or so, obtain the first matched curve；Second intends
Matched moulds block, for centered on the minimum point of the first matched curve, respectively taking the point of the second setting quantity to carry out at the center or so
Gauss curve fitting, obtains the second matched curve；Sending module is obtained, for according to the second matched curve, obtaining dispersion adjusted value, and
It is sent to TDC modules.
Preferably, feedback signal module is used for using 100 ps/nms as step-length, to the dispersion values in whole threshold range
It is adjusted；The collection of the feedback signal value of P/T module is carried out in each adjustment point.
By the present invention, using the feedback signal value for gathering P/T module under different TDC dispersion values, and the feedback to collecting
Signal value is carried out curve fitting to obtain dispersion adjusted value, and TDC dispersion values are adjusted by dispersion adjusted value, mesh is solved
Service board based on polarization tracking technology in preceding optical transmission network can not be realized using balanced reciver peak signal contrast
The problem of TDC dispersions are adjusted roughly, and then the demultiplexing for realizing polarised light has been reached, polarised light is not demultiplexed even in P/T module
Used time, it also can effectively realize the effect of TDC rough adjustment.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this hair
Bright schematic description and description is used to explain the present invention, does not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is a kind of step flow chart of according to embodiments of the present invention one dispersion compensation method；
Fig. 2 is a kind of step flow chart of according to embodiments of the present invention two dispersion compensation method；
Fig. 3 is the step flow chart that the TDC under a kind of according to embodiments of the present invention three control based on PT is adjusted roughly；
Fig. 4 is a kind of structured flowchart of according to embodiments of the present invention four dispersion compensation device；
Fig. 5 is a kind of structural representation of according to embodiments of the present invention five dispersion compensation device；
Fig. 6 is a kind of structural representation of according to embodiments of the present invention six dispersion compensation device；
Fig. 7 is the structural representation of the P/T module in Fig. 6 shown devices；
Two kinds of different dispersion values and PT during Fig. 8 (a) is the progress dispersion adjustment of the shown device of application drawing 6 with Fig. 8 (b)
The graph of a relation of module feedback signal value；
Fig. 9 is the application scenarios of the rough adjusting apparatus of TDC under a kind of control based on PT according to embodiments of the present invention
Schematic diagram.
Embodiment
Describe the present invention in detail below with reference to accompanying drawing and in conjunction with the embodiments.It should be noted that not conflicting
In the case of, the feature in embodiment and embodiment in the application can be mutually combined.
Embodiment one
Reference picture 1, shows a kind of step flow chart of according to embodiments of the present invention one dispersion compensation method.
The dispersion compensation method of the present embodiment comprises the following steps：
Step S102：Obtain under different TDC dispersion values, the feedback signal value of P/T module；
In whole threshold value, during being adjusted to TDC dispersion values, each adjusts the anti-of point one P/T module of collection
Feedback signal value, so as to realize under different TDC dispersion values, the acquisition of P/T module feedback signal value.
Step S104：Feedback signal value is carried out curve fitting, dispersion adjusted value is obtained；
The feedback signal value of acquisition is carried out curve fitting, to obtain an optimal dispersion adjusted value.
Step S106：Dispersion adjustment is carried out to TDC dispersion values according to dispersion adjusted value.
The dispersion adjusted value is sent to TDC modules, is adjusted roughly with carrying out dispersion to TDC dispersion values.
In correlation technique, when polarization optics demultiplexing is not implemented in P/T module, balanced reciver peak signal is unavailable,
It cannot realize that TDC dispersions are adjusted roughly using balanced reciver peak signal contrast, and then dispersion compensation can not be realized.It is logical
The present embodiment is crossed, using the feedback signal value of P/T module under the different TDC dispersion values of collection, and the feedback signal value collected is entered
Row curve matching is adjusted with obtaining dispersion adjusted value by dispersion adjusted value to TDC dispersion values, solves current optical transport
Service board based on polarization tracking technology in networking can not realize that TDC dispersions are thick using balanced reciver peak signal contrast
The problem of slightly adjusting, and then the demultiplexing for realizing polarised light has been reached, when P/T module is not demultiplexed to polarization optics,
The effect of TDC rough adjustment can effectively be realized.
Embodiment two
Reference picture 2, shows a kind of step flow chart of according to embodiments of the present invention two dispersion compensation method.
The dispersion compensation method of the present embodiment comprises the following steps：
Step S202：By adjusting TDC dispersion values in whole threshold value, the feedback signal of P/T module under different dispersion values is gathered
Value.
Generally, the threshold range that dispersion tuning range is -700ps/nm~700ps/nm is represented in whole threshold value,
Wherein, ps/nm represents ps/nm.But not limited to this, it will be appreciated by those skilled in the art that the present embodiment is equally applicable to
Other dispersion tuning ranges.
Step S204：Due to deviateing actual dispersion value dispersion point farther out, the feedback signal value approximately equal of P/T module,
The curved line relation of dispersion values and feedback signal value can not be correctly reacted, so needing to abandon the data of dispersion point farther out.
Wherein, the dispersion point that the dispersion point of actual dispersion value farther out refers to deviate actual dispersion value setpoint distance is deviateed, such as
Centered on the dispersion point of minimum value in TDC dispersion values, 4 dispersion points are continuously respectively taken to the left and right, continuous 9 are derived from
Dispersion point, and other dispersion point may be considered and deviate actual dispersion value dispersion point farther out and abandon.Certainly, in reality
The not limited to this in, those skilled in the art can suitably set the distance for deviateing actual dispersion point according to actual conditions, this
Invention is not restricted to this.
Step S206：According to the relation between the feedback signal value of TDC dispersion values and the P/T module collected, to feedback letter
Number value carries out curve fitting, to find optimal coarse adjustment dispersion values (i.e. dispersion adjusted value).
Step S208：The optimal coarse adjustment dispersion values that curve matching is obtained are sent to TDC modules, and TDC dispersion values are carried out
Dispersion is adjusted.
After it have effectively achieved TDC adjustment roughly, and then using the minimum value of balanced reciver peak signal, find
± 45 degree of DLI coarse phases, error code information finely tunes TDC dispersions and fine setting successively before the error correction finally provided using framer
DLI phases, finally realize that TDC dispersions fix optimal, and DLI phases persistently track fine setting.
Preferably, with big step-length, step value is preferably 100ps/nm, carries out dispersion values adjustment in whole threshold range,
When each adjustment point carries out a P/T module feedback signal collection, the feedback signal of P/T module can be by the SPI of module
(Serial Peripheral Interface, Serial Peripheral Interface) port is directly read, and the size of feedback signal is one
Determine ceaselessly to change in scope, multiple averaging need to be done and reduce accident error, it is therefore preferable to which 1000 times, polling interval is 1ms.
By the present embodiment, abandon and deviate the dispersion point of actual dispersion value farther out, and the P/T module gathered in the point is anti-
Feedback signal value so that curve matching is closer to actual conditions, and obtained dispersion adjusted value is more reasonable, and then can be more effectively
Dispersion adjustment is carried out to TDC dispersion values.
Embodiment three
Reference picture 3, shows the step of TDC under a kind of according to embodiments of the present invention three control based on PT is adjusted roughly
Flow chart.
Being adjusted roughly based on the TDC under PT controls for the present embodiment is comprised the following steps：
Step S302：A TDC dispersion values are adjusted every 100ps/nm.
Step S304：Gather the P/T module feedback signal value of the adjustment point.
Step S306：Judge in TDC threshold ranges whether TDC dispersion values adjust to finish, if so, performing step S308；If
No, then return to step S302 is continued executing with.
Step S308：Abandon the feedback signal value of the P/T module gathered in the case where deviateing the dispersion point farther out of actual dispersion value.
Wherein, dispersion point farther out refer to deviate actual dispersion value setpoint distance dispersion point, such as with TDC dispersion values most
Centered on the dispersion point of small value, 4 dispersion points are continuously respectively taken to the left and right, continuous 9 dispersion points are derived from, and it is other
Dispersion point, which may be considered, to be deviateed actual dispersion value dispersion point farther out and abandons.Certainly, not limited to this in actual applications,
Those skilled in the art can suitably set the distance for deviateing actual dispersion point according to actual conditions, and the present invention is not limited this
System.
Step S310：Binomial fitting is carried out to the feedback signal value collected.
In this step, to having abandoned remaining feedback signal value after the feedback signal value under dispersion point farther out, find first
Then minimum point respectively takes the point of the first setting quantity to carry out binomial fitting as center at the center or so, obtains first and intends
Close curve.Wherein, the first setting quantity is appropriately arranged with by those skilled in the art according to actual conditions, such as sets 15 feedback letters
First set quantity as 4 etc. during number value, of the invention is that this is not restricted.
Step S312：Gauss curve fitting is carried out to the feedback signal value for carrying out binomial fitting.
In this step, the feedback signal value in the first matched curve after binomial fitting to have passed through step S310,
Take centered on its minimum point, respectively take the point of the second setting quantity to carry out Gauss curve fitting at the center or so, obtain the second fitting bent
Line.Wherein, the second setting quantity is appropriately arranged with by those skilled in the art according to actual conditions, the invention is not limited in this regard.
Step S314：According to the second matched curve after Gauss curve fitting has been carried out, dispersion adjusted value is determined.
Step S316：According to dispersion adjusted value, dispersion adjustment is carried out to original TDC dispersion values.
It should be noted that in the present embodiment by taking binomial fitting and Gauss curve fitting as an example, to the curve matching of the present invention
It is explained.But not limited to this, it will be appreciated by those skilled in the art that embodiments of the invention be applied equally to it is other appropriate
Curve matching mode.
By the present embodiment, effectively realize when P/T module is not implemented or can not realized polarization optics demultiplexing, TDC colors
Dissipate the rough adjustment of value.The binomial fitting and Gauss curve fitting of the present embodiment are realized simply, and can preferably determine that dispersion is adjusted
Whole value, effectively to be adjusted to TDC dispersion values.
Example IV
Reference picture 4, shows a kind of structured flowchart of according to embodiments of the present invention four dispersion compensation device.
The dispersion compensation device of the present embodiment includes：Main control module 402 and TDC modules 404.Wherein, main control module 402 is wrapped
Include：Feedback signal module 4022, for obtaining under different TDC dispersion values, the feedback signal value of P/T module；Curve fitting module
4024, for being carried out curve fitting to feedback signal value, dispersion adjusted value is obtained, and be sent to TDC modules 404.TDC modules
404, for carrying out dispersion adjustment to TDC dispersion values according to dispersion adjusted value.
Preferably, main control module 402 also includes：Module is abandoned, for being obtained in feedback signal module 4022 in different TDC
Under dispersion values, after the feedback signal value of P/T module, abandon and deviate under the dispersion point of actual dispersion value farther out, the feedback of P/T module
Signal value.Wherein, dispersion point farther out refers to the dispersion point for deviateing actual dispersion value setpoint distance.
Preferably, curve fitting module 4024 includes：First fitting module, for comparing feedback signal value, finds minimum
Point is used as center；Respectively take the point of the first setting quantity to carry out binomial fitting at the center or so, obtain the first matched curve；The
Two fitting modules, for centered on the minimum point of the first matched curve, the point of the second setting quantity respectively to be taken at the center or so
Gauss curve fitting is carried out, the second matched curve is obtained；Sending module is obtained, for according to the second matched curve, obtaining dispersion adjustment
Value, and it is sent to TDC modules 404.
Preferably, feedback signal module 4022 is used for using 100ps/nm as step-length, to the dispersion values in whole threshold range
It is adjusted；The collection of the feedback signal value of P/T module is carried out in each adjustment point.
Preferably, main control module 402 also includes：Averaging module, for being obtained in feedback signal module 4022 in difference
Under TDC dispersion values, after the feedback signal value of P/T module, read once at interval of 1 millisecond, 1000 feedback letters are read from SPI
Number value；1000 feedback signal values of reading are averaged, the feedback signal value after obtaining averagely is used as final feedback signal value.
Preferably, the dispersion compensation device of the present embodiment also includes：Compensating module, in TDC modules 404 according to dispersion
Adjusted value is carried out after dispersion adjustment to TDC dispersion values, TDC dispersion values and balanced reciver peak signal after being adjusted according to dispersion
Minimum value, dispersion compensation is carried out to original TDC dispersion values.
Preferably, the dispersion compensation device of the present embodiment is applied to the 100G optical transport technologys of polarization tracking scheme.
By the present embodiment, solving the service board based on polarization tracking technology in current optical transmission network can not utilize
Balanced reciver peak signal contrast realizes the problem of TDC dispersions are adjusted roughly, and then has reached and realize demultiplexing for polarised light
With, even in P/T module not to polarization Optical Demultiplexing when, also can effectively realize the effect of TDC rough adjustment.
Embodiment five
Reference picture 5, shows a kind of structural representation of according to embodiments of the present invention five dispersion compensation device.
The dispersion compensation device of the present embodiment includes：
TDC modules 502, the different original of reflection position or transmission range of the module using the light of different wave length in grating
Reason, realizes pulse compression, so as to reach the effect of dispersion compensation.In the present embodiment, its be additionally operable to receive main control module 506 send out
The dispersion adjusted value sent, and then TDC dispersion values are adjusted roughly.
P/T module 504, the polarised light for the different directions that the module can quickly be tracked and transmitted in stable fiber reduces two
Crosstalk between polarised light, and separated the bias lighting of different directions by offset separation device.In the present embodiment, it is gone back
For feeding back the feedback signal value under different TDC dispersion values.
Main control module 506, its major function is the feedback signal value for gathering P/T module 504, and is found using curve matching
Dispersion point, obtains dispersion adjusted value, finally sends dispersion adjusted value so that each device cooperates, and completes dispersion and adjusts roughly.
Main control module 506 can be realized by CPU, but not limited to this, any to gather the feedback signal value of P/T module 504, and be utilized
Curve matching finds dispersion point, obtains dispersion adjusted value, finally sends dispersion adjusted value so that each device cooperates, and completes
The device or module that dispersion is adjusted roughly can realize main control module 506.
Flashlight be input to after TDC modules 502, dispersion compensating enter P/T module 504, P/T module 504 can quickly with
The polarised light of track both direction, reduces the crosstalk between two polarised lights, and vertical two perpendicular and parallel polarization light outputs are then demultiplex out.
In this process, P/T module 504 only can be just effectively separated in the certain dispersion allowed band of flashlight it is vertical and
Parallel polarised light, so be accomplished by TDC modules 502 effectively can roughly adjust to the dispersion of input signal.In order to find
The dispersion values adjusted roughly, main control module 506 gathers the feedback signal of P/T module 504, carries out curve fitting, and finds dispersion adjustment
Value, is then handed down to the progress dispersion of TDC modules 502 and adjusts roughly.
The present embodiment is as follows based on the process that the TDC under the control of P/T module 504 is adjusted roughly：By being adjusted in whole threshold value
TDC dispersion values, gather the feedback signal of P/T module 504 under different dispersion values；Due to deviateing the dispersion of actual dispersion value farther out
Point, the feedback signal approximately equal of P/T module 504, it is impossible to the curved line relation of correct reaction dispersion values and feedback signal value, institute
To need the data for abandoning dispersion point farther out；According to the pass between TDC dispersion values and the feedback signal value of the P/T module collected 504
System carries out curve fitting, and finds optimal coarse adjustment dispersion values (i.e. dispersion adjusted value)；Main control module 506 obtains curve matching most
Good coarse adjustment dispersion values are sent to TDC modules 502 and carry out dispersion adjustment.
By the present embodiment, solving the service board based on polarization tracking technology in current optical transmission network can not utilize
Balanced reciver peak signal contrast realizes the problem of TDC dispersions are adjusted roughly there is provided a kind of easily based on PT controls
The lower rough Adjusted Options of TDC.
Embodiment six
Reference picture 6, shows a kind of structural representation of according to embodiments of the present invention six dispersion compensation device.
The dispersion compensation device of the present embodiment includes：TDC modules 602, P/T module 604, and the master control realized by CPU 606
Module.
The dispersion tuning range of TDC modules 602 is -700ps/nm~700ps/nm, and regulating time is second level.TDC modules
602 be the control unit that can be interacted with main control module 606, can include logic control device (CPLD (Complex
Programmable Logic Device) or FPGA (Field Programmable Gate Array) etc.) and master control mould
Block communication device, dispersion adjustment actuator, hardware comparator etc..The major function of TDC modules 602 includes：Main control module 606 is sent out
Go out adjustment order, dispersion adjusted value be sent to TDC modules, TDC modules receive the dispersion adjusted value that main control module 606 is sent,
Original TDC dispersion values are adjusted.
The modular structure of P/T module 604 is as shown in fig. 7, mainly include FPGA controller, LiNbO3(lithium columbate crystal), partially
Shake beam separator, coupler and RF detectors.The polarised light of its different directions that can quickly track and be transmitted in stable fiber,
The crosstalk between two polarised lights is reduced, and is separated the bias lighting of vertical and parallel direction by offset separation device.Then
By being monitored to separating per polarised light all the way, wherein the polarised light size of the other direction included is as feedback letter
Number pass in fpga chip, so that fpga chip can correct the polarization tracking on main optical path in real time by feedback signal, subtract
Crosstalk between few two polarised lights.In addition, P/T module 604 provides a SPI interface as the external output of feedback signal.
In CPU 606, the present embodiment, the function of main control module is realized by CPU, the feedback signal value of P/T module 604 is gathered,
Carry out after particular procedure, find signal and carry out rough adjustment dispersion point, i.e. dispersion adjusted value, be then handed down to TDC modules 602 and enter
Row dispersion is adjusted roughly.
It is as follows that TDC under being controlled using the device progress of the present embodiment based on PT adjusts roughly flow：
TDC modules 602 carry out dispersion values adjustment in whole threshold range with big step-length, and (preferably, step value is 100ps/
Nm), each adjustment point carries out the feedback signal value of P/T module 604 collection.The feedback signal value of P/T module 604 can be by it
SPI port is directly read, and the size of feedback signal ceaselessly changes within the specific limits, need to be done multiple averaging and be reduced accident error
(being preferably 1000 times, polling interval 1ms).
Due to deviateing actual dispersion value dispersion point farther out, the feedback signal approximately equal of P/T module 604, curve compared with
It is flat, it is impossible to correctly to react the curved line relation of dispersion values and feedback signal value, so for deviateing the color of actual dispersion value farther out
Scatterplot needs to abandon, not as the data of curve matching.
May relatively it be put down in view of curve bottom, and a variety of causes can cause the saltus step of feedback signal, it is impossible to use minimum value
Method determines the actual dispersion in system, and PT can only substantially reflect the situation of dispersion variation.When software is realized, it is contemplated that exclude farther out
Optimum value is found out in dispersion point, matched curve.
Compare the corresponding feedback signal value of each dispersion point, find minimum point as center, 4 marches are respectively taken in its left and right
Line is fitted, and first time curve matching is binomial fitting, finds out approximate range；Second of curve matching is obtained with being fitted for the first time
Minimum point as center, respectively taken in left and right 4 points progress Gauss curve fittings, find optimum dispersion value, be used as dispersion adjusted value.
Finally, according to resulting optimum dispersion value, TDC is adjusted roughly.
In above-mentioned adjustment, relation such as Fig. 8 (a) and Fig. 8 (b) of dispersion values and P/T module feedback signal value are shown.Fig. 8 (a)
When to be respectively system dispersion value be 0ps/nm and 320ps/nm with Fig. 8 (b), the dispersion values of measurement and the feedback signal value of P/T module
Graph of a relation, and the obtained curve of fitting.Wherein, point curve represents the feedback signal value of the P/T module of sampling, smooth curve
Represent the obtained curve after being carried out curve fitting according to the feedback signal value of P/T module.
Reference picture 9, shows answering for the rough adjusting apparatus of TDC under a kind of control based on PT according to embodiments of the present invention
With the schematic diagram of scene.
As shown in figure 9, the TDC Adjusted Options under DQPSK modulation include：Transmitter unit is modulated using PDM-DQPSK, is received
Unit uses direct reception technique；Laser is divided into 2 tunnel orthogonal polarisation state light by polarization beam apparatus, and DQPSK modulation is carried out per road,
Then light beam is synthesized with polarization beam combiner again, transmission rate is 111.8Gbps.The direct reception of phase modulated signal is to use
Delayed interference and balance reception realize signal detection, because input signal is 2 tunnel polarization state signals, also need using optical polarization tracking
Technology isolates the DQPSK signals of 2 road polarized orthogonals.
On the basis of dispersion compensation effectively realizes TDC adjustment roughly under the above-mentioned control based on PT, and then using flat
The minimum value for the receiver peak signal that weighs, finds ± 45 degree of DLI coarse phases, is missed before the error correction finally provided using framer
Code information finely tunes TDC dispersions and fine setting DLI phases successively, finally realizes that TDC dispersions fix optimal, and DLI phases are persistently tracked
Fine setting.
As can be seen from the above description, adjusted roughly the invention provides the TDC under a kind of control based on P/T module
Scheme, it can provide necessary dispersion compensation to long-distance transmissions and high-speed dispersion sensitive equipment, improve optical channel access
The performance of equipment and the interference rejection ability of wavelength-division system, efficiently solve and are difficult by balanced reciver peak under PM-DQPSK modulation
Value signal contrast realizes the problem of TDC is adjusted roughly.
Compared with existing dispersion compensation technology, existing dispersion compensation technology mainly uses balanced reciver peak value to believe
Number contrast realizes that TDC dispersions are adjusted roughly, when polarization optics demultiplexing is not implemented in polarization tracking module (P/T module), balance
Receiver peak signal is unavailable；Only dispersion is in allowed band, and polarization tracking module could complete polarization demultiplexing.This
Outside, TDC dispersions are adjusted roughly using balanced reciver peak signal contrast be only suitable for existing 40G systems, and the double loads of 100G
Ripple scheme, is not suitable for the 100G optical transport technologys of polarization tracking scheme.
And the present invention is carried out curve fitting by the feedback signal value to P/T module, rough adjustment TDC modules, so as to realize
Polarization Optical Demultiplexing, overcomes the defect of original scheme, under the 100G optical transport technologys for the polarization tracking scheme that is particularly suitable for use in
TDC dispersion adjustment.
Obviously, those skilled in the art should be understood that above-mentioned each module of the invention or each step can be with general
Computing device realize that they can be concentrated on single computing device, or be distributed in multiple computing devices and constituted
Network on, alternatively, the program code that they can be can perform with computing device be realized, it is thus possible to they are stored
Performed in the storage device by computing device, and in some cases, can be shown to be performed different from order herein
The step of going out or describe, they are either fabricated to each integrated circuit modules respectively or by multiple modules in them or
Step is fabricated to single integrated circuit module to realize.So, the present invention is not restricted to any specific hardware and software combination.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (12)
1. a kind of dispersion compensation method, it is characterised in that including：
Obtain under different dispersion compensations adjustment TDC dispersion values, the feedback signal value of bias voltage tracking P/T module；
The feedback signal value is carried out curve fitting, dispersion adjusted value is obtained；
Dispersion adjustment is carried out to the TDC dispersion values according to the dispersion adjusted value；Wherein, the bias voltage tracking P/T module is use
In reducing the crosstalk between two polarised lights and one that separates described two polarised lights in certain dispersion range
Device.
2. according to the method described in claim 1, it is characterised in that adjust TDC dispersions in different dispersion compensations in described obtain
Under value, the step of the feedback signal value of bias voltage tracking P/T module after, in addition to：
Under the dispersion point for abandoning the setpoint distance for deviateing actual dispersion value, the feedback signal value of the P/T module.
3. method according to claim 2, it is characterised in that the color for abandoning the setting quantity for deviateing actual dispersion value
Include under scatterplot, the step of the feedback signal value of the P/T module：
Centered on the dispersion point of minimum value in the TDC dispersion values, left and right respectively takes continuous 4 dispersion points, obtains continuous 9
Individual dispersion point；
The feedback signal value of the P/T module under 9 dispersion points is obtained, the anti-of the P/T module under other dispersion points is abandoned
Feedback signal value.
4. the method according to claim 1,2 or 3, it is characterised in that carry out curve fitting, obtain to the feedback signal value
The step of taking dispersion adjusted value includes：
Compare the feedback signal value, find minimum point as center；
Respectively take the point of the first setting quantity to carry out binomial fitting at the center or so, obtain the first matched curve；
Centered on the minimum point of first matched curve, the point of the second setting quantity is respectively taken to carry out Gauss at the center or so
Fitting, obtains the second matched curve；
According to second matched curve, the dispersion adjusted value is obtained.
5. according to the method described in claim 1, it is characterised in that described obtain adjusts TDC dispersion values in different dispersion compensations
Under, include the step of the feedback signal value of bias voltage tracking P/T module：
Using 100 ps/nms as step-length, the dispersion values in whole threshold range are adjusted；
The collection of the feedback signal value of the P/T module is carried out in each adjustment point.
6. method according to claim 5, it is characterised in that adjust TDC dispersions in different dispersion compensations in described obtain
Under value, the step of the feedback signal value of bias voltage tracking P/T module after, in addition to：
At interval of 1 millisecond, 1000 feedback signal values are read from Serial Peripheral Interface SPI；
1000 feedback signal values of the reading are averaged, the feedback signal value after obtaining averagely is used as final feedback signal
Value.
7. the method according to any one of claim 1-3,5-6, it is characterised in that methods described is applied to polarization tracking
100G optical transports.
8. a kind of dispersion compensation device, it is characterised in that including main control module and dispersion compensation adjustment TDC modules, wherein,
The main control module, including：
Feedback signal module, for obtaining under different TDC dispersion values, the feedback signal value of bias voltage tracking P/T module；Curve is intended
Matched moulds block, for being carried out curve fitting to the feedback signal value, obtains dispersion adjusted value, and be sent to the TDC modules；
The TDC modules, for carrying out dispersion adjustment to the TDC dispersion values according to the dispersion adjusted value；Wherein, it is described inclined
It is for reducing the crosstalk between two polarised lights in certain dispersion range and by described two polarizations to put tracking P/T module
The device that light is separated.
9. device according to claim 8, it is characterised in that the main control module also includes：
Module is abandoned, for being obtained in the feedback signal module under different dispersion compensations adjustment TDC dispersion values, bias voltage tracking
After the feedback signal value of P/T module, abandon deviate actual dispersion value setpoint distance dispersion point under, the P/T module it is anti-
Feedback signal value.
10. device according to claim 9, it is characterised in that the module of abandoning is used in the feedback signal module
Obtain under different dispersion compensations adjustment TDC dispersion values, after the feedback signal value of bias voltage tracking P/T module, with the TDC colors
Dissipate in value centered on the dispersion point of minimum value, left and right respectively takes continuous 4 dispersion points, obtain continuous 9 dispersion points；Obtain institute
The feedback signal value of the P/T module under 9 dispersion points is stated, the feedback signal value of the P/T module under other dispersion points is abandoned.
11. the device according to claim 8,9 or 10, it is characterised in that the curve fitting module includes：
First fitting module, for comparing the feedback signal value, finds minimum point as center；Is respectively taken at the center or so
The point of one setting quantity carries out binomial fitting, obtains the first matched curve；
Second fitting module, for centered on the minimum point of first matched curve, respectively taking second to set at the center or so
The point of fixed number amount carries out Gauss curve fitting, obtains the second matched curve；
Sending module is obtained, for according to second matched curve, obtaining the dispersion adjusted value, and be sent to the TDC
Module.
12. device according to claim 8, it is characterised in that the feedback signal module is used for 100 ps/nms
For step-length, the dispersion values in whole threshold range are adjusted；The feedback signal of the P/T module is carried out in each adjustment point
The collection of value.
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