CN101132239B - Estimation apparatus and method for optimum dispersion compensation of long-distance WDM system - Google Patents
Estimation apparatus and method for optimum dispersion compensation of long-distance WDM system Download PDFInfo
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- CN101132239B CN101132239B CN2006100304229A CN200610030422A CN101132239B CN 101132239 B CN101132239 B CN 101132239B CN 2006100304229 A CN2006100304229 A CN 2006100304229A CN 200610030422 A CN200610030422 A CN 200610030422A CN 101132239 B CN101132239 B CN 101132239B
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Abstract
This invention provides a best evaluation device for the dispersion compensation of a long distance WDM system composed of an adjustable dispersion compensation module, an adjustable attenuation unit, an optical power monitor unit, an error code test unit and a management and control and data process center, in which, after the device is accessed into the WDM system, it can realize the best evaluation to dispersion compensation of the long distance WDM system.
Description
Technical field:
The present invention relates to the optimum dispersion compensation assessment in the optical communication field, the apparatus for evaluating and the method for a kind of long-distance WDM (Wavelength Division Multiplexing, wavelength-division multiplex technique) system optimal dispersion compensation.
Background technology:
In recent years, along with WDM technology to high speed, overlength, highly dense direction fast development, the dispersion compensation problem of wdm system seems very outstanding.For example the dispersion tolerance representative value of 10Gb/s electro-absorption modulation NRZ signal is 800～1000ps/nm, and the dispersion tolerance representative value of 40Gb/s only is 60ps/nm, and the dispersion tolerance of system is all very little, need consider accurate dispersion compensation like this when the length Distance Transmission.The dispersion compensation mode is divided precompensation, line build-out, post-compensation by the placement location of dispersion compensation module, divides undercompensation, full remuneration, overcompensation again by the final residual chromatic dispersion.
Fig. 1 is the structured flowchart of wdm system, and this system introduction is as follows:
A) wdm system is finished the two fine transmitted in both directions of n road business, and channel wavelength is λ
1λ
nOCh represents the optical channel layer, and OMS represents optical multiplex layer; The wdm system that contains OADM (Optical Add-Drop Multiplexer, Optical Add Drop Multiplexer) website also can be with reference to execution;
B) OTU (Optical Transform Unit, optical convering unit) can be the 3R photoelectricity light conversion of single channel light signal, also can be that multi-path low speed rate light signal and single channel high-speed optical signal converge, separate the 3R photoelectricity light conversion between converging; OTU1 represents that wavelength is λ
1OTU, OTUn represents that wavelength is λ
nOTU;
C) OM represents wave multiplexer, and OD represents channel-splitting filter, and OA represents image intensifer, and DCM represents dispersion compensation module.
Following situation will influence the dispersion compensation effect:
A) when the length Distance Transmission, need to consider nonlinear effect, especially self phase modulation and cross-phase modulation effect, to the influence of dispersion compensation.I.2.4, ITU-T G.696.1 (07/2005) " Longitudinally compatible intra-domain DWDMapplications " appendix has mentioned the influence of nonlinear effect to dispersion compensation;
B) grow under the Distance Transmission, because the power lack of uniformity of each passage in the wdm system (mainly comes from the stimulated Raman scattering gain of system, next is the gain unevenness of image intensifer) and the self phase modulation influence that causes is different, and the influence degree difference of the asynchronous cross-phase modulation of channel spacing;
C) at present on the engineering dispersion compensating fiber of wide-scale adoption carry out dispersion compensation because may there be the chromatic dispersion gradient mismatch in dispersion compensating fiber, causes in the long haul transmission system residual dispersion of each wavelength unequal, and might differ bigger;
D) system adopts forward direction error code correction function and determination level of receiver adjustment function all can the dispersion tolerance of system to be exerted an influence;
E) dispersion tolerance of the system of dissimilar lasers, different modulating sign indicating number type after long Distance Transmission differs greatly and also difference of the ability of resist nonlinear effect;
F) influence of the fiber type of circuit use.For example G.652, G.653, optical fiber G.655, not only abbe number has difference, and nonlinear effect is also different to the influence of dispersion compensation.
Optimum dispersion compensation mode in the existing optical communication field mainly is to determine the dispersion compensation mode according to the fibre circuit engineering prospecting data according to Theoretical Calculation.When engineering beginning, determine the total residual dispersion of chromatic dispersion compensation quantity and system of each node according to a series of guidelines.The existing problem of this method is:
A) Theoretical Calculation of dispersion compensation is not omnipotent, there are error in Theoretical Calculation and actual engineering, especially the calculating of the nonlinear effect of intensive wdm system is quite complicated under long Distance Transmission situation, and the dispersion compensation that disposes according to Theoretical Calculation might not be the optimum dispersion compensation point;
B) precision of the residual dispersion of the fibre circuit in engineering investigation test is limited, and optical fiber is long more, and the measure error of accumulation is big more, and the dispersion compensation of determining according to the chromatic dispersion test result might not be the optimum dispersion compensation point.
The present invention's " the novel apparatus for evaluating and method of optimum dispersion compensation of long-distance WDM system ", not direct measuring system residual dispersion, but on the configure base of the rough Theoretical Calculation of system, by additional dispersion compensator, investigate the system transmissions performance, avoid the measurement of residual dispersion, and taken into account of the influence of the multiple effect of very difficult theoretical accurate Calculation the system dispersion compensation, thus the assessment of the optimum dispersion compensation of the system of realization.
Summary of the invention:
The object of the present invention is to provide a kind of apparatus for evaluating and method of optimum dispersion compensation of long-distance WDM system, the Theoretical Calculation that mainly solves the dispersion compensation of existing method is difficult to take into account multiple to the factor of chromatic dispersion compensation effect influence and the limited technical problem of precision of residual dispersion test, realizes the assessment of the optimum dispersion compensation of system.
For solving the problems of the technologies described above, technical scheme of the present invention is:
A kind of apparatus for evaluating of optimum dispersion compensation of long-distance WDM system is characterized in that it is controlled by adjustable dispersion compensating module, adjustable damping unit, optical power monitoring unit, error code testing unit and management and data processing centre forms; Wherein:
This adjustable dispersion compensating module receives the order from management control and data processing centre, the additional chromatic dispersion of regulating system multiplex section;
This adjustable damping unit receives the order from management control and data processing centre, regulates the input optical power in OTU line side;
The input optical power in this monitoring OTU line side, optical power monitoring unit, and report management control and data processing centre;
This error code testing unit connects the client's sidelight mouth toward OTU, forms the error code testing loop; And the error rate reported management control and data processing centre;
This management control and data processing centre's management and control adjustable dispersion compensating module, adjustable damping unit, optical power monitoring unit and error code testing unit, deal with data, computational analysis goes out the additional dispersion values under the optimum dispersion compensation.
A kind of appraisal procedure of optimum dispersion compensation of long-distance WDM system is used aforesaid apparatus for evaluating, and its method step is:
1), apparatus for evaluating is inserted wdm system: the adjustable dispersion compensating module is connected in before the OD of wdm system, the adjustable damping unit is connected between OD and the OTU, the line side input optical power of optical power monitoring unit monitoring OTU, the client's sidelight mouth that the error code testing unit is connected past OTU, form the error code testing loop, this moment, system did not have error code;
2), set the additional chromatic dispersion of adjustable dispersion compensating module, by regulating the decay of adjustable damping unit, measure sensitivity after the system transmissions under this additional dispersion values; Measure sensitivity after the system transmissions under other additional dispersion values successively;
3), to 2) additional chromatic dispersion and system transmissions after the sensitivity data curve carry out match, analysis meter is calculated the center of curve;
4), repeat 1) to 3), measure the sensitivity after the system transmissions under the additional chromatic dispersion of difference of other typical channel, and analysis meter is calculated the additional chromatic dispersion of other typical channel under optimum dispersion compensation;
5), the comprehensive additional chromatic dispersion of typical channel under optimum dispersion compensation, provide the suggestion of the chromatic dispersion compensation quantity that wdm system should increase or reduce on existing dispersion compensation basis.
Further comprise optical splitter in this apparatus for evaluating, this optical splitter with input optical power by 50/50 receiving unit and the optical power monitoring unit of giving OTU.
Further comprise information interactive interface in this apparatus for evaluating, this information interactive interface is connected with the control and management center, realizes user's transmitting control commands and display result.
This adjustable dispersion compensating module places the optical multiplex layer receiving terminal, adopts multichannel adjustable dispersion compensating module.
This adjustable attenuator places optical channel layer receiving terminal or places the optical multiplex layer receiving terminal.
Above-mentioned steps 3) the match mode in is a Gauss curve fitting.
By above-mentioned technical characterictic, the beneficial effect of apparatus of the present invention and method is:
Apparatus of the present invention and method are owing to taked the adjustable dispersion compensating module to regulate chromatic dispersion, carry out the method that the system optimal dispersion compensation is determined in match to transmitting back sensitivity, reached the effect of wdm system optimum dispersion compensation, save wdm system operation, management, maintenance cost, also improved the technical merit of wdm system simultaneously.
Description of drawings:
Fig. 1 is the structured flowchart of wdm system;
Fig. 2 is the structured flowchart of dispersion compensation apparatus for evaluating of the present invention;
Fig. 3 is the structured flowchart that dispersion compensation apparatus for evaluating and this device are connected with wdm system in the embodiment of the invention;
Fig. 4 is measurement curve and the match of transmitting back sensitivity and additional chromatic dispersion in the embodiment of the invention.
Embodiment:
See also Fig. 2, it is the structured flowchart of the apparatus for evaluating of optimum dispersion compensation of long-distance WDM system of the present invention.As shown in the figure: it forms E by adjustable dispersion compensating modules A, adjustable damping unit B, optical power monitoring unit C, error code testing cells D and management control and data processing centre: wherein:
This adjustable dispersion compensating modules A receives the order from management control and data processing centre, the additional chromatic dispersion of regulating system multiplex section;
This adjustable damping unit B receives the order from management control and data processing centre, regulates the input optical power in OTU line side;
The input optical power in this optical power monitoring unit C monitoring OTU line side, and report management control and data processing centre;
This error code testing cells D connects the client's sidelight mouth toward OTU, forms the error code testing loop; And the error rate reported management control and data processing centre;
This management control and the E of data processing centre management and control adjustable dispersion compensating modules A, adjustable damping unit B, optical power monitoring unit C and error code testing cells D, deal with data, computational analysis goes out the optimum dispersion compensation condition.
Use the appraisal procedure step of above-mentioned apparatus for evaluating to be:
1), apparatus for evaluating is inserted wdm system: before the OD that is connected in wdm system with the adjustable dispersion compensating modules A, the adjustable damping unit B is connected between OD and the OTU, the line side input optical power of optical power monitoring unit C monitoring OTU, the client's sidelight mouth that the error code testing cells D is connected past OTU, form the error code testing loop, this moment, system did not have error code;
2), set the additional chromatic dispersion of adjustable dispersion compensating modules A, by regulating the decay of adjustable damping unit B, measure sensitivity after the system transmissions under this additional dispersion values; Measure sensitivity after the system transmissions under other additional dispersion values successively;
3), to 2) additional chromatic dispersion and system transmissions after the sensitivity data curve carry out match, analysis meter is calculated the center of curve;
4), repeat 1) to 3), measure the sensitivity after the system transmissions under the additional chromatic dispersion of difference of other typical channel, and analysis meter is calculated the additional chromatic dispersion of other typical channel under optimum dispersion compensation;
5), the comprehensive additional chromatic dispersion of typical channel under optimum dispersion compensation, provide the suggestion of the chromatic dispersion compensation quantity that wdm system should increase or reduce on existing dispersion compensation basis.
According to a preferred embodiment among Fig. 3 the present invention is described in further detail below:
The apparatus for evaluating of the optimum dispersion compensation in this example is made up of functional modules such as adjustable dispersion compensating module 1, adjustable attenuator 2,50/50 optical splitter 3, optical power monitoring unit 4, Error Detector 5, control and management center 6, information interactive interface 7.Wherein:
This adjustable dispersion compensating module 1 places OMS layer receiving terminal, adopts multichannel adjustable dispersion compensating module, as GT etalon, phase sample Chirp Bragg grating or the like, receives the dispersion adjustment order from the upper strata, the chromatic dispersion of regulating system.The adjustable extent of adjustable dispersion compensating module and adjustable step pitch are by the dispersion tolerance decision of system;
This adjustable attenuator 2 can place OCh layer receiving terminal, also can place OMS layer receiving terminal, receives the decay order from control and management center 6, regulates the input optical power of OTU;
50/50 optical splitter 3 and optical power monitoring unit 4, this optical splitter 3 with input optical power by 50/50 give OTU1 receiving unit and and the optical power monitoring unit, also can omit optical splitter 3, finish the input optical power monitoring function by OTU self;
Client's sidelight mouth of this Error Detector 5 (as: SDH analyzer) and OTU links to each other, and cooperates adjustable attenuator 2 and optical power monitoring unit 4, finishes the measurement of the sensitivity under specific bit error rate;
These control and management center 6 control and management adjustable dispersion compensating modules 1, adjustable attenuator 2, optical power monitoring unit 4, Error Detector 5; Relation between analyzing and processing receiving sensitivity and adjustable dispersion compensating module 1 chromatic dispersion value of setting calculates the additional dispersion values under the optimum dispersion compensation;
This information interactive interface 7 is used to realize user's transmitting control commands and display result.
Use the appraisal procedure step of dispersion compensation of this device as follows:
The first step: the optimum dispersion compensation apparatus for evaluating inserts wdm system.
1) transmission of Error Detector 5 part and receiving unit are directly connected client's sidelight interface toward local OTU, with respective distal end OTU loopback (by client's sidelight choma return or plate in electric loopback), form an error code testing loop, the error code testing loop should not have error code at this moment; Also the transmission of Error Detector 5 partly can be connected toward far-end OTU client side joint and receive the light mouth, the even past local OTU client's side of the receiving unit of Error Detector 5 is sent the light mouth.Though notice that this moment, system did not have error code, system not necessarily is in the optimum dispersion compensation state;
2) as Fig. 3 adjustable dispersion compensating module 1, adjustable attenuator 2, optical splitter 3 are inserted the error code testing loop; Optical power monitoring unit 4 is connected to the another port monitoring input optical power of optical splitter; Information interactive interface 7 is connected to control and management center 6; Control and management center 6 connects and can manage regulating and controlling adjustable dispersion compensating module 1 and adjustable attenuator 2, and management and reception are from the value of reporting of optical power monitoring unit 4;
3) adjustable dispersion compensating module 1 and adjustable attenuator 2 are made zero, this moment, the error code testing loop should not have error code.
Second step: the relation of measuring additional chromatic dispersion and transmission back sensitivity.
Under the situation that adjustable attenuator 2 makes zero, regulate adjustable dispersion compensating module 1, find to make light path obstructed or the critical additional chromatic dispersion CD of error code arranged
MinAnd CD
MaxAt chromatic dispersion CD
MinAnd CD
MaxBetween be Δ with the step pitch
CDRegulate the dispersion values of adjustable dispersion compensating module, Δ
CDBe recommended as 10～100ps/nm or other desired values.Be CD for example in additional chromatic dispersion
xSituation under, regulate adjustable attenuator 2, measuring receiver sensitivity S EN
xSurveyed the receiver sensitivity under all additional dispersion values successively.Each functional module is automatic or semi-automatic to be finished above step for coordinate at the control and management center.
The 3rd step: the data of analyzing and handle transmission back sensitivity and additional chromatic dispersion.
1) selects fitting data.Find out best sensitivity S EN
Min, exclude both sides and compare SEN
MinAt least bad Δ
SENData point, Δ
SENBe recommended as 1～3dB, remaining data are carried out curve fitting.
2) recommend Gauss curve fitting, formula is
Y is transmission back sensitivity, and x is additional chromatic dispersion.Obtain the central point x of matched curve
c, i.e. additional chromatic dispersion under the optimal compensation; And require and fitting parameter w and A calculate the additional chromatic dispersion compensation range CD of permission according to Power penalty
Range
3) Fig. 4 is that sensitivity is with the diffusing variation relation of addition color after the transmission, and wherein chain-dotted line is a measured curve, and sweep is matched curve, wherein x
cBe the additional chromatic dispersion under the optimization dispersion compensation.
If x
c＞0, the expression system need reduce the negative dispersion compensation amount; Otherwise, if x
c＜0, the expression system need increase the negative dispersion compensation amount;
The 4th step: measure other typical channel, the choice criteria of typical channel is edge wavelength and the middle wavelength that comprises system, and the recommended typical number of channels is 3～7.Draw the additional dispersion values of other typical channel under optimum dispersion compensation;
The 5th step: analysis-by-synthesis is carried out in additional chromatic dispersion under the optimal compensation of all typical channel and additional chromatic dispersion compensation range, and consider the chromatic dispersion gradient of the dispersion compensation module that the chromatic dispersion gradient of adjustable dispersion compensating module 1 and wdm system adopt, the additional chromatic dispersion compensation quantity that the judgement system should increase or reduce.
Being preferred embodiment of the present invention only in sum, is not to be used for limiting practical range of the present invention.Be that all equivalences of doing according to the content of the present patent application claim change and modification, all should be technology category of the present invention.
Claims (7)
1. the apparatus for evaluating of an optimum dispersion compensation of long-distance WDM system is characterized in that it is controlled by adjustable dispersion compensating module, adjustable damping unit, optical power monitoring unit, error code testing unit and management and data processing centre forms; Wherein:
This adjustable dispersion compensating module receives the order from management control and data processing centre, the additional chromatic dispersion of regulating system multiplex section;
This adjustable damping unit receives the order from management control and data processing centre, regulates the input optical power in optical convering unit line side;
The input optical power in this monitoring optical convering unit line side, optical power monitoring unit, and report management control and data processing centre;
This error code testing unit connects the client's sidelight mouth toward optical convering unit, forms the error code testing loop; And the error rate reported management control and data processing centre;
This management control and data processing centre's management and control adjustable dispersion compensating module, adjustable damping unit, optical power monitoring unit and error code testing unit, deal with data, computational analysis goes out the additional dispersion values under the optimum dispersion compensation.
2. the appraisal procedure of an optimum dispersion compensation of long-distance WDM system is used apparatus for evaluating as claimed in claim 1, and its method step is:
1), apparatus for evaluating is inserted wdm system: the adjustable dispersion compensating module is connected in before the channel-splitting filter of wdm system, the adjustable damping unit is connected between channel-splitting filter and the optical convering unit, the line side input optical power of optical power monitoring unit monitoring optical convering unit, the client's sidelight mouth that the error code testing unit is connected past optical convering unit, form the error code testing loop, this moment, system did not have error code;
2), set the additional chromatic dispersion of adjustable dispersion compensating module, by regulating the decay of adjustable damping unit, measure sensitivity after the system transmissions under this additional dispersion values; Measure sensitivity after the system transmissions under other additional dispersion values successively;
3), to 2) additional chromatic dispersion and system transmissions after the sensitivity data curve carry out match, analysis meter is calculated the center of curve;
4), repeat 1) to 3), measure the sensitivity after the system transmissions under the additional chromatic dispersion of difference of other typical channel, and analysis meter is calculated the additional chromatic dispersion of other typical channel under optimum dispersion compensation;
5), the comprehensive additional chromatic dispersion of typical channel under optimum dispersion compensation, provide the suggestion of the chromatic dispersion compensation quantity that wdm system should increase or reduce on existing dispersion compensation basis.
3. the appraisal procedure of optimum dispersion compensation of long-distance WDM system according to claim 2, it is characterized in that further comprising in this apparatus for evaluating optical splitter, this optical splitter with input optical power by 50/50 receiving unit and the optical power monitoring unit of giving optical convering unit.
4. the appraisal procedure of optimum dispersion compensation of long-distance WDM system according to claim 2, it is characterized in that further comprising in this apparatus for evaluating information interactive interface, this information interactive interface is connected with the control and management center, realizes user's transmitting control commands and display result.
5. according to the appraisal procedure of claim 2 or 3 or 4 described optimum dispersion compensation of long-distance WDM system, it is characterized in that this adjustable dispersion compensating module places the optical multiplex layer receiving terminal, adopt multichannel adjustable dispersion compensating module.
6. according to the appraisal procedure of claim 2 or 3 or 4 described optimum dispersion compensation of long-distance WDM system, it is characterized in that this adjustable attenuator places optical channel layer receiving terminal or places the optical multiplex layer receiving terminal.
7. according to the appraisal procedure of claim 2 or 3 or 4 described optimum dispersion compensation of long-distance WDM system, it is characterized in that this match mode is a Gauss curve fitting.
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| CN105680935A (en) * | 2016-02-01 | 2016-06-15 | 深圳市共进电子股份有限公司 | Method, device and system for detecting optimum working voltages of receiving ends of GPON (Gigabit-capable passive optical networks) system |
| CN106130644B (en) * | 2016-07-20 | 2018-04-03 | 上海交通大学 | Frequency-domain equilibrium method based on dispersion overcompensation |
| WO2018094574A1 (en) * | 2016-11-22 | 2018-05-31 | 华为技术有限公司 | Dispersion compensation method and apparatus |
| CN107547166B (en) * | 2017-09-21 | 2018-12-28 | 烽火通信科技股份有限公司 | The system and method for 40G wavelength-division transmission device OMSP pretection switch |
| CN114362825A (en) * | 2022-01-04 | 2022-04-15 | 武汉电信器件有限公司 | Method and system for DWDM system dispersion adjustment based on switch interconnection |
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|---|---|---|---|---|
| CN1211118A (en) * | 1997-09-11 | 1999-03-17 | 富士通株式会社 | Method and apparatus for optimizing dispersion in optical fiber transmission line in accordance with optical signal power level |
| DE10130993C1 (en) * | 2001-06-27 | 2003-04-24 | Siemens Ag | Arrangement for optimizing quality of wavelength division multiplex signal with residual dispersion has decoupler, module for adjusting residual dispersion of signal, signal quality detector |
| CN1674475A (en) * | 2004-03-26 | 2005-09-28 | 富士通株式会社 | Dispersion compensating method and dispersion compensating apparatus |
| CN1758041A (en) * | 2004-09-28 | 2006-04-12 | 西门子公司 | Method and arrangement for determining the dispersion of an optical transmission link |
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2006
- 2006-08-25 CN CN2006100304229A patent/CN101132239B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1211118A (en) * | 1997-09-11 | 1999-03-17 | 富士通株式会社 | Method and apparatus for optimizing dispersion in optical fiber transmission line in accordance with optical signal power level |
| DE10130993C1 (en) * | 2001-06-27 | 2003-04-24 | Siemens Ag | Arrangement for optimizing quality of wavelength division multiplex signal with residual dispersion has decoupler, module for adjusting residual dispersion of signal, signal quality detector |
| CN1674475A (en) * | 2004-03-26 | 2005-09-28 | 富士通株式会社 | Dispersion compensating method and dispersion compensating apparatus |
| CN1758041A (en) * | 2004-09-28 | 2006-04-12 | 西门子公司 | Method and arrangement for determining the dispersion of an optical transmission link |
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