CN102386980A - Chromatic dispersion compensation method and device - Google Patents
Chromatic dispersion compensation method and device Download PDFInfo
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- CN102386980A CN102386980A CN2011103600992A CN201110360099A CN102386980A CN 102386980 A CN102386980 A CN 102386980A CN 2011103600992 A CN2011103600992 A CN 2011103600992A CN 201110360099 A CN201110360099 A CN 201110360099A CN 102386980 A CN102386980 A CN 102386980A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2513—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion
Abstract
The invention provides a chromatic dispersion compensation method and a chromatic dispersion compensation device. The method comprises the following steps of: splitting an optical signal to be transmitted into a first beam of optical signal and a second beam of optical signal, wherein the first beam of optical signal is used for acquiring chromatic dispersion information, and the second beam of optical signal is used for transmitting service data; acquiring the chromatic dispersion information from the first beam of optical signal; and performing primary chromatic dispersion compensation on the second beam of optical signal according to the acquired chromatic dispersion information. By the technical scheme provided by the invention, the problems of high system cost, configuration inflexibility, smooth upgrading incapability and the like in related technologies can be solved to further break the limitations of whether transmitting services or not; the switching of the services among channels can be flexibly controlled; a control realization mode can be flexibly controlled, namely both centralized control and distributed control can be adopted; the seamless embedding of a system can be realized; and high smooth transition upgrading capability can be achieved.
Description
Technical field
The present invention relates to the optical-fiber network communication technique field, in particular to a kind of dispersion compensation method and device.
Background technology
Chromatic dispersion refers to that polychromatic light is decomposed into monochromatic light and forms the phenomenon of spectrum, and the chromatic dispersion meeting causes long haul optical transmission systems signal variation, and influences along with the lifting of transmission range and transmission rate and to become greatly.Before the 40Gbit/s rate system occurred, optical transmission system generally was employed in multiplex section configuring fixed dispersion compensation module (Dispersion Compensation Module abbreviates DCM as) and realizes dispersion compensation.And for 40G and above rate system; Because the dispersion compensation module compensation precision is not enough, mismatch, the variation of ambient temperature of dispersion slope compensation and optical fiber have considerable influence and line upkeep possibly cause dispersion variation etc. to chromatic dispersion; Also before the receiver of channel layer, disposed adjustable dispersion compensating (tunable chromatic dispersion compensation; Abbreviate TDC as), be used to accomplish the meticulous dynamic compensation of channel layer chromatic dispersion.
At present more typical TDC modulator approach adopts the method for fine tuning after the first coarse adjustment mostly, and this modulator approach shortcoming is: the business that reality must be arranged on (1) passage; (2) modulation is slower, and the modulation of one whole probably needs 5 to 10 minutes.Like this; Realize the system of protection for needs; If breaking down, service aisle switched to the protection passage; And could begin to start modulation after coming because the protection passage has only by the time actual business to switch, the business recovery time can't be satisfied the time requirement of in the standard G.806 protection being switched certainly like this.
In order to satisfy requirement higher in the optical transmission system to the dispersion compensation real-time; Also can adopt single channel chromatic dispersion monitor system; But the intensive multiplexed optical wave of single channel exists system cost high with (Dense Wavelength Division Multiplexing abbreviates DWDM as) dispersion monitoring device; The configuration underaction, can't smooth upgrade etc. problem.Make troubles for user's use.
To the problems referred to above in the correlation technique, effective solution is not proposed as yet at present.
Summary of the invention
In correlation technique, the system cost that existing chromatic dispersion monitor technology exists is high, dispose dumb and can't smooth upgrade etc. problem, the invention provides a kind of dispersion compensation method and device, one of to address the above problem at least.
According to an aspect of the present invention; A kind of dispersion compensation method is provided, has comprised: light signal waiting for transmission has been divided into the first bundle light signal and the second bundle light signal, wherein; The said first bundle light signal is used to obtain dispersion information, and the said second bundle light signal is used for service data transmission; From the said first bundle light signal, obtain said dispersion information; According to the said dispersion information that obtains the said second bundle light signal is carried out the dispersion compensation first time.
From the first bundle light signal, obtain dispersion information, comprising: the dispersion information that obtains the light signal of user's specified wavelength in the light signal of the user's specified wavelength from the first bundle light signal; According to the dispersion information that obtains the second bundle light signal is carried out dispersion compensation first time, comprising: according to the dispersion information of the light signal of the user's specified wavelength that obtains to second restraint the user's specified wavelength in the light signal light signal carry out the dispersion compensation first time.
Obtain dispersion information from first bundle the light signal, comprising: the corresponding dispersion information of light signal that obtains each wavelength in the light signal with all wavelengths in the light signal of all wavelengths from the first bundle light signal; According to the dispersion information that obtains the second bundle light signal is carried out dispersion compensation first time, comprising: according to the corresponding dispersion information of the light signal of each wavelength that obtains to second restraint all wavelengths in the light signal light signal carry out the dispersion compensation first time.
Before first bundle obtains dispersion information the light signal, also comprise one of following: receive user's operational order, wherein, operational order is used for that indication is every restraints light signal at a distance from first predetermined amount of time from first and obtain dispersion information; Dispose second predetermined amount of time, wherein, when second predetermined amount of time arrived, indication was obtained dispersion information from the first bundle light signal; Whether produce LOF (LOF) alarm on the circuit of the detected transmission second bundle light signal, wherein, when detecting the LOF alarm, indication is obtained dispersion information from the first bundle light signal.
The dispersion information that above-mentioned basis is obtained carries out the second bundle light signal also comprising: confirm the optimum dispersion offset after the dispersion compensation first time; According to the optimum dispersion offset of confirming the second bundle light signal is carried out the dispersion compensation second time.
Above-mentioned definite optimum dispersion offset comprises: the forward error correction FEC error rate of obtaining a plurality of predetermined amount of time; From the FEC error rate of obtaining, confirm the minimum FEC error rate; Confirm the offset corresponding according to the minimum FEC error rate with it, and with definite offset as the The optimal compensation value.
Before above-mentioned definite optimum dispersion offset, also comprise: detect after first time dispersion compensation second restraint light signal dispersion values; Confirm that detected dispersion values reaches predetermined threshold value.
The dispersion information that above-mentioned basis is obtained carries out the second bundle light signal also comprising before the dispersion compensation first time: receive the operational order that comes from the user, wherein, operational order is used for indication to the second bundle light signal is carried out the dispersion compensation first time.
According to a further aspect in the invention; A kind of dispersion compensation device is provided; Comprise: spectral module is used for light signal waiting for transmission is divided into the first bundle light signal and the second bundle light signal, wherein; The said first bundle light signal is used to obtain dispersion information, and the said second bundle light signal is used for service data transmission; Acquisition module is used for obtaining said dispersion information from the said first bundle light signal; First compensating module is used for according to the said dispersion information that obtains the said second bundle light signal being carried out the dispersion compensation first time.
Above-mentioned acquisition module also is used for from the light signal of user's specified wavelength of the first bundle light signal, obtaining the dispersion information of the light signal of user's specified wavelength; Above-mentioned compensating module also is used for according to the dispersion information of the light signal of user's specified wavelength of obtaining the light signal of user's specified wavelength of the second bundle light signal being carried out the dispersion compensation first time.
Above-mentioned acquisition module also is used for from the light signal of all wavelengths of the first bundle light signal, obtaining the corresponding dispersion information of light signal of each wavelength in the light signal with all wavelengths; Above-mentioned compensating module also is used for according to the corresponding dispersion information of the light signal of each wavelength of obtaining the light signal of all wavelengths of the second bundle light signal being carried out the dispersion compensation first time.
Said apparatus also comprises: determination module is used for confirming the optimum dispersion offset; Compensating module also is used for according to the optimum dispersion offset of confirming the second bundle light signal being carried out the dispersion compensation second time.
Above-mentioned determination module comprises: acquiring unit is used to obtain the error rate before the FEC error correction of a plurality of predetermined amount of time; Confirm the unit, be used for confirming the minimum FEC error rate from the FEC error rate of obtaining; And confirm the offset corresponding according to the minimal forward error correction FEC error rate with it, and with definite offset as the The optimal compensation value.
Through the present invention; Employing is told from light signal waiting for transmission and a branch ofly is exclusively used in the light signal (the first bundle light signal) that detects dispersion information and according to the dispersion information that detects the light signal of wanting service data transmission is carried out the technological means of dispersion compensation automatically, has solved the system cost height that exists in the correlation technique, dispose dumb and can't smooth upgrade etc. problem; And then reached and do not received the whether restriction of transport service; Can control flexibly professional in interchannel switching and control the implementation pattern flexible configuration simultaneously, can centralized control, also can adopt distributed control; The seamless embedding of realization system has the powerful effect that seamlessly transits upgrading ability.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart according to the dispersion compensation method of the embodiment of the invention;
Fig. 2 is the structured flowchart according to the dispersion compensation device of the embodiment of the invention;
Fig. 3 is the structural representation of dispersion compensation device according to the preferred embodiment of the invention;
Fig. 4 is the structural representation according to the dispersion compensation device of the embodiment of the invention 1;
Fig. 5 is the schematic flow sheet according to the dispersion compensation method of the embodiment of the invention 2;
Fig. 6 is the structural representation according to the dispersion compensation device of the embodiment of the invention 3;
Fig. 7 is the structural representation according to the dispersion compensation device of the embodiment of the invention 4.
Embodiment
Hereinafter will and combine embodiment to specify the present invention with reference to accompanying drawing.Need to prove that under the situation of not conflicting, embodiment and the characteristic among the embodiment among the application can make up each other.
Fig. 1 is the flow chart according to the dispersion compensation method of the embodiment of the invention.As shown in Figure 1, this method comprises:
Step S102 is divided into the first bundle light signal and the second bundle light signal with light signal waiting for transmission, and wherein, the first bundle light signal is used to obtain dispersion information, and the second bundle light signal is used for service data transmission.
Step S104 obtains dispersion information from the first bundle light signal;
Step S106 carries out the dispersion compensation first time according to the dispersion information that obtains to the second bundle light signal.
Through above-mentioned treatment step; Owing to told from light signal waiting for transmission and a branch ofly to be exclusively used in the light signal (the first bundle light signal) that detects dispersion information and the light signal of wanting service data transmission to be carried out dispersion compensation automatically according to the dispersion information that detects; Therefore, can solve configuration dumb and can't smooth upgrade etc. problem, adopt above-mentioned processing procedure simultaneously; Owing to can realize concentrating chromatic dispersion to detect, provide cost savings.
In step S102; In order not influence or to reduce the influence to the transmission of regular traffic data, the ratio of the light signal of the transmission that the above-mentioned first bundle signal is shared is very little, can not influence the transmission of regular traffic data; For example, aforementioned proportion can be 2%, 3%, 4% or 5% etc.
In the specific implementation, can carry out dispersion compensation, also can carry out dispersion compensation the light signal of all wavelengths to the light signal of a certain wavelength of user's appointment in the light signal waiting for transmission, particularly:
In step S104, from the first bundle light signal, obtain dispersion information, can comprise following processing procedure: the dispersion information that obtains the light signal of user's specified wavelength in the light signal of the user's specified wavelength from the first bundle light signal; Correspondingly; In step S106; According to the dispersion information that obtains the second bundle light signal is carried out dispersion compensation first time, can comprise: according to the dispersion information of the light signal of the user's specified wavelength that obtains to second restraint the user's specified wavelength in the light signal light signal carry out the dispersion compensation first time.Perhaps
In step S104; Obtain dispersion information from first bundle the light signal, can comprise following processing procedure: the corresponding dispersion information of light signal that obtains each wavelength in the light signal with all wavelengths in the light signal of all wavelengths from the first bundle light signal; Correspondingly; In step S106; According to the dispersion information that obtains the second bundle light signal is carried out dispersion compensation first time, can comprise following processing procedure: according to the corresponding dispersion information of the light signal of each wavelength that obtains to second restraint all wavelengths in the light signal light signal carry out the dispersion compensation first time.
Before step S104; Can also set and regularly compensate controlling mechanism; Particularly, before first bundle obtained dispersion information in the light signal, can also comprise one of following processing procedure: (1) received user's operational order; Wherein, said operational order is used for that indication is every restraints light signal at a distance from first predetermined amount of time from said first and obtain said dispersion information; (2) configuration second predetermined amount of time, wherein, when said second predetermined amount of time arrived, indication was obtained said dispersion information from the said first bundle light signal; (3) whether produce LOF (LOF) alarm on the circuit of the said second bundle light signal of detected transmission, wherein, when detecting the LOF alarm, indication is obtained said dispersion information from the said first bundle light signal.
In order to make the dispersion compensation effect better, can also specifically comprise following processing procedure: confirm the optimum dispersion offset to the second bundle light signal is carried out fine tuning after the dispersion compensation in the first time; According to the optimum dispersion offset of confirming the second bundle light signal is carried out the dispersion compensation second time.
In the above-described embodiments; Can take the mode of different definite optimum dispersion offsets according to actual conditions; For example can be according to forward error correction (Forward error correction; Abbreviating FEC as) error rate confirms the optimum dispersion offset, specifically can comprise following treatment step: the FEC error rate of obtaining a plurality of predetermined amount of time; From the FEC error rate of obtaining, confirm the minimum FEC error rate; Confirm the offset corresponding according to the minimum FEC error rate with it, and with definite offset as the The optimal compensation value.
Dispersion compensation can be provided with a detection step before starting for the second time; Only the first time of detecting the second bundle light signal after the dispersion compensation dispersion values restart the chromatic dispersion second time when satisfying certain condition; Particularly; Before definite optimum dispersion offset, can also comprise following processing procedure: detect after first time dispersion compensation second restraint light signal dispersion values; Confirm that detected dispersion values reaches predetermined threshold value.Whether LOF (Loss Of Frame the abbreviates LOF as) alarm that when concrete, can detect on the above-mentioned second bundle light signal circuit disappears, if disappear then begin dispersion compensation for the second time, otherwise does not start dispersion compensation for the second time.
In step S106; Can trigger automatically according to the dispersion information that obtains the second bundle light signal is carried out the dispersion compensation first time; Also can trigger: from the first bundle light signal, obtain after the dispersion information through following processing mode; Dispersion information is informed the user, operate to trigger according to dispersion information by the user then the second bundle light signal is carried out the dispersion compensation first time, particularly according to the dispersion information that obtains; Before the second bundle light signal being carried out the dispersion compensation first time according to the dispersion information that obtains; Can also comprise following processing procedure: receive the operational order that comes from the user, wherein, operational order is used for indication to the second bundle light signal is carried out the dispersion compensation first time.
A kind of dispersion compensation device also is provided in the present embodiment, and this device is used to realize the foregoing description and preferred implementation, has carried out repeating no more of explanation, describes in the face of relating to module in this device down.As following employed, the combination of the software and/or the hardware of predetermined function can be realized in term " module ".Although the described device of following examples is preferably realized with software, hardware, perhaps the realization of the combination of software and hardware also maybe and be conceived.Fig. 2 is the structured flowchart according to embodiment of the invention dispersion compensation device.As shown in Figure 2, this device comprises:
Compensating module 24 is used for according to the dispersion information that obtains the second bundle light signal being carried out the dispersion compensation first time.
Preferably, above-mentioned acquisition module 22 also is used for from the light signal of user's specified wavelength of the first bundle light signal, obtaining the dispersion information of the light signal of user's specified wavelength; Above-mentioned compensating module 24 also is used for according to the dispersion information of the light signal of user's specified wavelength of obtaining the light signal of user's specified wavelength of the second bundle light signal being carried out the dispersion compensation first time.
In a preferred implementation of the present invention, above-mentioned acquisition module 22 also is used for from the light signal of all wavelengths of the first bundle light signal, obtaining the corresponding dispersion information of light signal of each wavelength in the light signal with all wavelengths; Above-mentioned compensating module also is used for according to the corresponding dispersion information of the light signal of each wavelength of obtaining the light signal of all wavelengths of the second bundle light signal being carried out the dispersion compensation first time.
Preferably, as shown in Figure 3, said apparatus can also comprise: determination module 26, be connected to compensating module 24, and be used for confirming the optimum dispersion offset; Above-mentioned compensating module 24 also is used for according to the said optimum dispersion offset of confirming the said second bundle light signal being carried out the dispersion compensation second time.
Preferably, as shown in Figure 3, above-mentioned determination module 26 comprises: acquiring unit 260, and be connected to and confirm unit 262, be used to obtain forward error correction (FEC) error rate of a plurality of predetermined amount of time; Confirm unit 262, be used for confirming the minimum FEC error rate from the FEC error rate of obtaining; And confirm the offset corresponding according to the minimal forward error correction FEC error rate with it, and with definite offset as the The optimal compensation value.
In order to understand the foregoing description better, specify below in conjunction with relevant drawings and preferred embodiment.Consider that in following examples the TDC regulation and control time exceeds problems such as threshold value on monitoring problem and the passage of the chromatic dispersion colourity in the correlation technique, mainly from the following aspects prior art is improved: 1, self-timing detects compensation control; 2, can accomplish the control of dispersion compensation automatically; 3, can set the scope that adjustment allows skew according to the user.Wherein,, can adopt one of following technical scheme to realize self-timing compensation control for the 1st aspect: but user's transmitting order to lower levels detects controller to chromatic dispersion, and notice is every initiates the one-time detection compensation automatically at a distance from certain time period; Or this system default is configured to automatic compensation model, and section detects compensation once automatically at regular intervals; As long as perhaps detect and produce just unlatching one-time detection compensation automatically of a LOF alarm on the circuit.
Embodiment 1
Present embodiment relate to a kind of can be to the central controlled apparatus and method of chromatic dispersion of optical transport network (Optical Transport Network abbreviates OTN as) device network.
The purpose of present embodiment is, the TDC regulation and control time on monitoring problem and the passage of the chromatic dispersion colourity that exists in the prior art of overcoming exceeds the problem of threshold value, and to achieve these goals, present embodiment provides following technical scheme:
As shown in Figure 4, the dispersion compensation device of present embodiment comprises: chromatic dispersion lock 40, chromatic dispersion detector 42, chromatic dispersion detect controller 44, dispersion compensation controller 46, dispersion compensator 48 and chromatic dispersion fine tuning controller 50 and form.
Wherein, above-mentioned chromatic dispersion lock 40 is equivalent to the spectral module 20 among Fig. 2 and/or Fig. 3, and dispersion compensator 48 is equivalent to the compensating module 24 among Fig. 2 and/or Fig. 3, and the function that chromatic dispersion fine tuning controller 50 is accomplished also can be accomplished by determination module 26.Dispersion compensation controller 46, dispersion compensation controller 46 and 50 functions that will accomplish of chromatic dispersion fine tuning controller all can be accomplished by the compensating module in the foregoing description 24.
As shown in Figure 4; Above-mentioned chromatic dispersion lock 40; Form by optical splitter; The light signal that is used for circuit is transmitted is through the optical splitter beam split, and wherein a branch of light (being equivalent to the bundle of second in the foregoing description light signal) is sent to chromatic dispersion adjustment controller (comprising dispersion compensation controller 46, dispersion compensator 48 and chromatic dispersion fine tuning controller 50) through filter with the specified wavelength signal, and other a branch of light (being equivalent to the bundle of first in the foregoing description light signal) is directly passed to chromatic dispersion detector 42;
Chromatic dispersion detector 42; Detect the dispersion values of specified wavelength light signal; Can be made up of filter unit and chromatic dispersion detecting unit, computing unit, wherein, filter unit is used to leach the light signal of specified wavelength; The chromatic dispersion detecting unit is used for the light signal of the specified wavelength that leaches is carried out sample detecting, and computing unit is used for calculating dispersion values according to the result of sample detecting.
Chromatic dispersion detects controller 44, is used to receive user command, and the user command of identification user command after will discern then passes to chromatic dispersion detector 42 and carry out the chromatic dispersion detection;
Dispersion compensation controller 46 is used for the dispersion values according to specific wavelength, and control dispersion compensator 48 is carried out dispersion compensation, dispersion compensator 48 is adjusted on the offset of appointment.Chromatic dispersion adjustment controller line transmits practical business;
Chromatic dispersion fine tuning controller 50, the LOF alarm disappears on the circuit when detecting, and opens dispersion compensation fine tuning process.According to the FEC error rate on the circuit, the dispersion compensation optimum point is sought in 48 fine tunings of control dispersion compensator.
Filter unit in the above-mentioned chromatic dispersion detector 42 can use tunable filter or grating to realize that detecting unit is made up of AD detector and system CPU software;
Above-mentioned chromatic dispersion detects controller 44, can be made up of the software module with user interface;
Above-mentioned dispersion compensation controller 46 is made up of system CPU software and communication interface;
Above-mentioned dispersion compensator 48 can be chosen Tunable Dispersion Compensator TDC;
Above-mentioned chromatic dispersion fine tuning controller 50 is made up of system CPU software.
Embodiment 2
Present embodiment provides a kind of dispersion compensation method, and this method is used to realize the concentrated adjustment control of wavelength, need to prove that the method in the present embodiment can realize based on the module among the embodiment 1.As shown in Figure 5, this method comprises:
Step S502, beginning;
Step S504, chromatic dispersion detects the controller transmitting order to lower levels and gives chromatic dispersion detection module wavelength to be detected;
Step S506, the chromatic dispersion detection module leaches the specified wavelength signal;
Does step S508 leach success? Failure then changes step S510 over to, and is successful then get into step S512;
Step S510, report and alarm, adjustment finishes.
Step S512, the sampling of chromatic dispersion detection module, calculating specified wavelength signal dispersion value;
Step S514 sends dispersion information to detecting controller;
Step S516 detects controller dispersion information is sent to chromatic dispersion adjustment controller;
Step S518, chromatic dispersion adjustment controller sends the adjustment order according to information to the veneer of respective wavelength;
Step S520, corresponding veneer is according to the adjustment of adjustment order control dispersion compensator;
Does step S522 adjust successfully? Successful then change step S526 over to, failure then changes step S524 over to;
Step S524, report and alarm sends adjustment failure order and gives the dispersion compensation controller, and whole process finishes.
Step S526 sends the adjustment success command and gives the dispersion compensation controller;
Step S528, does the LOF alarm disappear on the chromatic dispersion fine tuning controller detection line? Then change step S530 over to if disappear, if then do not wait for always;
Step S530 opens the fine tuning process;
Step S532, chromatic dispersion fine tuning controller obtains current chromatic dispersion compensation point N (ps/nm), waits for 3S, reads the preceding error rate Ei of FEC error correction on the circuit;
Step S534, chromatic dispersion fine tuning controller control dispersion compensator is transferred to N-5 with current offset, waits for 3S, reads the preceding error rate E2 of FEC error correction on the circuit;
Step S536, chromatic dispersion fine tuning controller control dispersion compensator is transferred to N+5 with current offset, waits for 3S, reads the preceding error rate E3 of FEC error correction on the circuit;
Step S538, relatively E1, E2, E3 find smallest point,
Step S540, is smallest point at N? Then jump to step S546 if not, otherwise change step S542 over to;
Step S542, relatively counter adds 1;
Step S544, relatively is counter more than or equal to 3? If then jump to step S550, then jump to step S548 if not;
Step S546, relatively counter O reset;
Step S548 is adjusted to this smallest point with dispersion compensator, jumps to step S532 and carries out again;
Step S550, fine tuning finishes.
Adopt the technique scheme of present embodiment, can effectively detect and compensate, do not receive the whether restriction of transport service, can control professionally flexibly, have great practical value in interchannel switching to the passage chromatic dispersion.Present embodiment has been realized centralized detecting simultaneously, has practiced thrift cost, and; Control implementation pattern flexible configuration; Can centralized control, also can adopt distributed control, and can be on the different levels of system configuration detection/control module; The seamless embedding of realization system has the powerful upgrading ability that seamlessly transits.
Embodiment 3
Present embodiment provides a kind of dispersion compensation device, and is as shown in Figure 6, comprising: optical splitter 60, Optical Demultiplexing Unit 62, chromatic dispersion detector 42, chromatic dispersion detect controller 44, dispersion compensation controller 46, dispersion compensator 48 and chromatic dispersion fine tuning controller 50.Wherein, optical splitter 10 is divided into two bundles with the light signal on the circuit according to certain ratio, a branch of Optical Demultiplexing Unit 62 that is sent to, and another bundle is sent to chromatic dispersion detector 42.Through user interface chromatic dispersion is detected controller 44 and issue a certain specified wavelength signal realization chromatic dispersion detection, chromatic dispersion detects controller 44 and through communication link order is handed down to chromatic dispersion detector 42, and chromatic dispersion detector 42 control filter units 420 output wavelengths are λ
NSignal, calculate dispersion values through detecting unit 422, computing unit 424, dispersion values is fed back to chromatic dispersion through communication link detects controller 44, chromatic dispersion detects controller 44 and feeds back to the user through the communication link road.The user is with specific wavelength λ
NIssue dispersion compensation controller 46 with the dispersion values of this wavelength, dispersion compensation controller 46 control dispersion compensators 48 are realized compensation adjustment.50 pairs of links of chromatic dispersion fine tuning controller are realized fine tuning.
Described in embodiment 1, the computing unit 424 in the chromatic dispersion detector 42 can be selected to calculate dispersion values according to the phase modulated method.
The concrete course of work of the dispersion compensation device of present embodiment is following:
The first step, the user issues wavelength X
NThe chromatic dispersion sense command of signal detect controller 44 to chromatic dispersion;
In second step, chromatic dispersion detects controller 44 transmitting order to lower levels and gives chromatic dispersion detector 42 wavelength X to be detected
N
In the 3rd step, the filter unit 420 of chromatic dispersion detector 42 leaches the specified wavelength signal;
In the 4th step, 42 pairs of chromatic dispersion detectors leach signal and carry out sample detecting, calculate the dispersion values of this signal through computing unit 424, are converted to the dispersion values on the service link by the splitting ratio of optical splitter;
In the 5th step, chromatic dispersion detector 42 crossed disperstions detect controller 44 and send dispersion information;
In the 6th step, chromatic dispersion detects controller 44 and notifies the user with dispersion values;
In the 7th step, the user issues dispersion compensation and orders to dispersion compensation controller 46, and wavelength information and dispersion values are carried in order;
In the 8th step, dispersion compensation controller 46 is to λ
NDispersion compensator 48 on the wavelength sends the dispersion compensation order;
The 9th step, dispersion compensator 48 adjustment;
In the tenth step, adjust and successfully then send the adjustment success command, otherwise send adjustment failure order to dispersion compensation controller 46 to dispersion compensation controller 46;
In the 11 step, dispersion compensation controller 46 is with success or failure notification message user.
The 12 step, does the LOF alarm disappear on chromatic dispersion fine tuning controller 50 detection lines? Then got into for the 15 step if disappear, if then do not wait for always;
In the 13 step, open the fine tuning process;
In the 14 step, chromatic dispersion fine tuning controller 50 obtains current chromatic dispersion compensation point N (ps/nm), waits for 3S, reads the preceding error rate Ei of FEC error correction on the circuit;
In the 15 step, chromatic dispersion fine tuning controller 50 control dispersion compensators are transferred to N-5 with current offset, wait for 3S, read the preceding error rate E2 of FEC error correction on the circuit;
In the 16 step, chromatic dispersion fine tuning controller 50 control dispersion compensators are transferred to N+5 with current offset, wait for 3S, read the preceding error rate E3 of FEC error correction on the circuit;
In the 17 step, relatively E1, E2, E3 find smallest point,
The 18 step, is smallest point at N? Then jumped to for the 21 step if not, otherwise down carry out;
In the 19 step, relatively counter adds 1;
The 20 step, relatively is counter more than or equal to 3? If then jumped to for the 23 step, then jumped to for the 22 step if not;
The 21 step, relatively counter O reset;
The 22 step was adjusted to this smallest point with dispersion compensator 48, jumped to for the 16 step and carried out again;
In the 23 step, fine tuning finishes.
Embodiment 4
Present embodiment provides a kind of dispersion compensation device, and is as shown in Figure 7, comprising: optical splitter 60, Optical Demultiplexing Unit 62, chromatic dispersion detector 42, dispersion compensation controller 46, dispersion compensator 48 and chromatic dispersion fine tuning controller 50.Omit chromatic dispersion with respect to the device in 3 enforcements of embodiment and detected controller 44, therefore, can realize the automatic control of dispersion compensation.
Wherein, optical splitter 60 is divided into two bundles with the light signal on the circuit according to certain ratio, a branch of Optical Demultiplexing Unit 62 that is sent to, and another bundle is sent to chromatic dispersion detector 42.Through user interface chromatic dispersion compensating controller 46 is issued the dispersion compensation order; Dispersion compensation controller 46 is handed down to chromatic dispersion detector 42 through communication link with order; Chromatic dispersion detector 42 control filter units 420 leach all signals of optical multiplexing section successively; Detect, calculate its dispersion values, and the respective value of wavelength and chromatic dispersion is preserved, been scanned gets corresponding relation with wavelength and dispersion values and feeds back to dispersion compensation controller 46 through communication link.46 controls of dispersion compensation controller issue the compensation order to the dispersion compensator of corresponding wavelength successively, realize compensation adjustment.Chromatic dispersion fine tuning controller 50 is realized the fine tuning compensation respectively on the line.
The concrete course of work of the dispersion compensation device of present embodiment is following:
The first step, the user issues wavelength compensation and orders to dispersion compensation controller 46;
In second step, dispersion compensation controller 46 will be ordered through communication link and will be transmitted to chromatic dispersion detector 42;
In the 3rd step, 1 beginning from λ is supposed in the 420 all band signal filtering successively of chromatic dispersion detector 42 control filter units;
The 4th step, filter unit 420 filtering, whether the signal of chromatic dispersion detector 42 inspection wavelength is effective, effectively then gets into for the 5th step, invalidly then jumps to for the 6th step;
In the 5th step, 42 pairs of chromatic dispersion detectors leach signal and carry out sample detecting, calculate the dispersion values of this signal through computing unit 424, are converted to the dispersion values on the service link by the splitting ratio of optical splitter;
In the 6th step, chromatic dispersion detector 42 judges whether available band signal in addition, the 4th step of then rebound is arranged to next band signal filtering, does not then jump to for the 7th step;
In the 7th step, chromatic dispersion detector 42 crossed disperstion compensating controllers 46 send wavelength and chromatic dispersion corresponding informance;
In the 8th step, dispersion compensation controller 46 sends the dispersion compensation order according to the dispersion compensator on wavelength specified wavelength successively 48;
The 9th step, dispersion compensator 48 adjustment;
In the tenth step, adjust and successfully then send the adjustment success command, otherwise send adjustment failure order to dispersion compensation controller 46 to dispersion compensation controller 46;
The 11 step, all useful wavelength dispersion compensation successes, 46 of dispersion compensation controllers return success information and notify the user; Otherwise return the failure notification message user.If can sending order, the failure user confirm whether to let all dispersion compensation controllers 46 recover initial value.
Need to prove that present embodiment is similar to process and the fine tuning process among the embodiment 3 that light signal carries out fine tuning, repeats no more here.
In another embodiment, a kind of software is provided also, this software is used for carrying out the technical scheme that the foregoing description and preferred implementation are described.
In another embodiment, a kind of storage medium is provided also, has stored above-mentioned software in this storage medium, this storage medium includes but not limited to: CD, floppy disk, hard disk, scratch pad memory etc.
Obviously, it is apparent to those skilled in the art that above-mentioned each module of the present invention or each step can realize with the general calculation device; They can concentrate on the single calculation element; Perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element; Thereby; Can they be stored in the storage device and carry out, and in some cases, can carry out step shown or that describe with the order that is different from here by calculation element; Perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1. a dispersion compensation method is characterized in that, comprising:
Light signal waiting for transmission is divided into the first bundle light signal and the second bundle light signal, and wherein, the said first bundle light signal is used to obtain dispersion information, and the said second bundle light signal is used for service data transmission;
From the said first bundle light signal, obtain said dispersion information;
According to the said dispersion information that obtains the said second bundle light signal is carried out the dispersion compensation first time.
2. method according to claim 1 is characterized in that,
From the said first bundle light signal, obtain said dispersion information, comprising: the dispersion information that obtains the light signal of said user's specified wavelength in the light signal of the user's specified wavelength from the said first bundle light signal;
According to the said dispersion information that obtains the said second bundle light signal is carried out dispersion compensation first time, comprising: according to the dispersion information of the light signal of the said user's specified wavelength that obtains to said second restraint the said user's specified wavelength in the light signal light signal carry out the dispersion compensation first time.
3. method according to claim 1 is characterized in that,
Obtain said dispersion information from said first bundle the light signal, comprising: the corresponding dispersion information of light signal that obtains each wavelength in the light signal with said all wavelengths in the light signal of all wavelengths from the said first bundle light signal;
According to the said dispersion information that obtains the said second bundle light signal is carried out dispersion compensation first time, comprising: according to the corresponding dispersion information of the light signal of said each wavelength that obtains to said second restraint the said all wavelengths in the light signal light signal carry out the dispersion compensation first time.
4. method according to claim 1 is characterized in that, before said first bundle obtains said dispersion information the light signal, also comprises one of following:
Receive user's operational order, wherein, said operational order is used for indication and whenever obtains said dispersion information at a distance from first predetermined amount of time from the said first bundle light signal;
Dispose second predetermined amount of time, wherein, when said second predetermined amount of time arrived, indication was obtained said dispersion information from the said first bundle light signal;
Whether produce LOF LOF alarm on the circuit of the said second bundle light signal of detected transmission, wherein, when detecting the LOF alarm, indication is obtained said dispersion information from the said first bundle light signal.
5. according to each described method of claim 1 to 4, it is characterized in that, the said second bundle light signal carried out also comprising after the dispersion compensation first time according to the said dispersion information that obtains:
Confirm the optimum dispersion offset;
According to the said optimum dispersion offset of confirming the said second bundle light signal is carried out the dispersion compensation second time.
6. method according to claim 5 is characterized in that, confirms the optimum dispersion offset, comprising:
Obtain the forward error correction FEC error rate of a plurality of predetermined amount of time;
From the FEC error rate of obtaining, confirm the minimum FEC error rate;
Confirm the offset corresponding according to the said minimum FEC error rate with it, and with definite offset as said The optimal compensation value.
7. method according to claim 5 is characterized in that, confirms also to comprise before the optimum dispersion offset:
The dispersion values of the said second bundle light signal of detection after first time dispersion compensation;
Confirm that detected said dispersion values reaches predetermined threshold value.
8. according to each described method of claim 1 to 4, it is characterized in that, the said second bundle light signal carried out also comprising before the dispersion compensation first time according to the said dispersion information that obtains:
Reception comes from user's operational order, and wherein, said operational order is used for indication to the said second bundle light signal is carried out the dispersion compensation first time.
9. a dispersion compensation device is characterized in that, comprising:
Spectral module is used for light signal waiting for transmission is divided into the first bundle light signal and the second bundle light signal, and wherein, the said first bundle light signal is used to obtain dispersion information, and the said second bundle light signal is used for service data transmission;
Acquisition module is used for obtaining said dispersion information from the said first bundle light signal;
Compensating module is used for according to the said dispersion information that obtains the said second bundle light signal being carried out the dispersion compensation first time.
10. device according to claim 9 is characterized in that,
Said acquisition module also is used for from the light signal of user's specified wavelength of the said first bundle light signal, obtaining the dispersion information of the light signal of said user's specified wavelength;
Said compensating module also is used for according to the dispersion information of the light signal of said user's specified wavelength of obtaining the light signal of said user's specified wavelength of the said second bundle light signal being carried out the dispersion compensation first time.
11. device according to claim 9 is characterized in that,
Said acquisition module also is used for from the light signal of all wavelengths of the said first bundle light signal, obtaining the corresponding dispersion information of light signal of each wavelength in the light signal with said all wavelengths;
Said compensating module also is used for according to the corresponding dispersion information of the light signal of said each wavelength of obtaining the light signal of the said all wavelengths of the said second bundle light signal being carried out the dispersion compensation first time.
12. according to each described device of claim 9 to 11, it is characterized in that,
Said device also comprises: determination module is used for confirming the optimum dispersion offset;
Said compensating module also is used for according to the said optimum dispersion offset of confirming the said second bundle light signal being carried out the dispersion compensation second time.
13. device according to claim 12 is characterized in that, said determination module comprises:
Acquiring unit is used to obtain the error rate before the FEC error correction of a plurality of predetermined amount of time;
Confirm the unit, be used for confirming the minimum FEC error rate from the FEC error rate of obtaining; And confirm the offset corresponding according to the said minimal forward error correction FEC error rate with it, and with definite offset as said The optimal compensation value.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110360099.2A CN102386980B (en) | 2011-11-14 | Dispersion compensation method and device | |
| PCT/CN2012/074398 WO2013071734A1 (en) | 2011-11-14 | 2012-04-19 | Chromatic dispersion compensation method and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110360099.2A CN102386980B (en) | 2011-11-14 | Dispersion compensation method and device |
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| CN102386980A true CN102386980A (en) | 2012-03-21 |
| CN102386980B CN102386980B (en) | 2016-12-14 |
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| WO2013071734A1 (en) | 2013-05-23 |
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