CN101132239A - 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
- Publication number
- CN101132239A CN101132239A CNA2006100304229A CN200610030422A CN101132239A CN 101132239 A CN101132239 A CN 101132239A CN A2006100304229 A CNA2006100304229 A CN A2006100304229A CN 200610030422 A CN200610030422 A CN 200610030422A CN 101132239 A CN101132239 A CN 101132239A
- Authority
- CN
- China
- Prior art keywords
- dispersion compensation
- dispersion
- optical
- unit
- adjustable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000006185 dispersion Substances 0.000 title claims abstract description 167
- 238000000034 method Methods 0.000 title claims description 19
- 230000003287 optical effect Effects 0.000 claims abstract description 86
- 238000012360 testing method Methods 0.000 claims abstract description 26
- 238000011156 evaluation Methods 0.000 claims abstract description 24
- 230000005540 biological transmission Effects 0.000 claims description 26
- 238000012544 monitoring process Methods 0.000 claims description 25
- 230000035945 sensitivity Effects 0.000 claims description 23
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 5
- 230000003993 interaction Effects 0.000 description 5
- 230000009022 nonlinear effect Effects 0.000 description 5
- 239000013307 optical fiber Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 239000000835 fiber Substances 0.000 description 3
- 101100518559 Homo sapiens OTUB1 gene Proteins 0.000 description 2
- 101150115940 OTU1 gene Proteins 0.000 description 2
- 102100040461 Ubiquitin thioesterase OTUB1 Human genes 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000001069 Raman spectroscopy Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Images
Landscapes
- Optical Communication System (AREA)
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
The technical field is as follows:
the invention relates to the optimal dispersion compensation evaluation in the field of optical communication, in particular to an evaluation device and method for the optimal dispersion compensation of a long-distance WDM (Wavelength Division Multiplexing) system.
Background art:
in recent years, with the rapid development of WDM technology in the directions of high speed, super-long length and high density, the problem of dispersion compensation in WDM systems is very prominent. For example, the typical value of the dispersion tolerance of 10Gb/s electro-absorption modulated NRZ signals is 800 to 1000ps/nm, while the typical value of the dispersion tolerance of 40Gb/s is only 60ps/nm, and the dispersion tolerance of the system is very small, so that accurate dispersion compensation needs to be considered during long-distance transmission. The dispersion compensation mode comprises pre-compensation, line compensation and post-compensation according to the placement position of the dispersion compensation module, and under-compensation, complete compensation and over-compensation according to the final residual dispersion.
Fig. 1 is a block diagram of a WDM system introduced as follows:
a) WDM system completes double-fiber bidirectional transmission of n-path service with channel wavelength of lambda 1 ……λ n (ii) a OCh denotes an optical channel layer, OMS denotes an optical multiplexing section layer; WDM systems with OADM (optical-drop multiplexer, optical add drop multiplexer) sites are also referred to for implementation;
b) An OTU (optical transform unit, optical forwarding unit) may be 3R photoelectric optical conversion of a single-path optical signal, or may be 3R photoelectric optical conversion between convergence and convergence of a multi-path low-rate optical signal and a single-path high-speed optical signal; OTU1 denotes a wavelength of λ 1 OTU of (1), OTUn represents a wavelength of λ n The OTU of (1);
c) OM denotes a combiner, OD denotes a splitter, OA denotes an optical amplifier, and DCM denotes a dispersion compensation module.
The following will affect the dispersion compensation effect:
a) In long-distance transmission, the influence of nonlinear effects, especially self-phase modulation effect and cross-phase modulation effect, on dispersion compensation needs to be considered. ITU-T G.696.1 (07/2005) "longitudinallty compatible intra-domain DWDM applications" appendix I.2.4 mentions the effect of non-linear effects on dispersion compensation;
b) Under long-distance transmission, the influence of self-phase modulation effect caused by the power imbalance of each channel in a WDM system (mainly due to stimulated Raman scattering gain of the system and then gain unevenness of an optical amplifier) is different, and the influence degree of cross-phase modulation is different when the channel intervals are different;
c) At present, dispersion compensation optical fibers adopted in large scale in engineering carry out dispersion compensation, and because the dispersion compensation optical fibers may have dispersion slope mismatch, residual dispersion of each wavelength in a long-distance transmission system is unequal, and the phase difference is possibly larger;
d) The system adopts a forward error correction function and a receiver decision level adjustment function, which can affect the dispersion tolerance of the system;
e) The dispersion tolerance difference of systems with different types of lasers and different modulation code patterns after long-distance transmission is large, and the nonlinear effect resistance is different;
f) The effect of the type of fiber used for the line. For example, g.652, g.653, and g.655 fibers, not only do the dispersion coefficients differ, but nonlinear effects also have different effects on dispersion compensation.
The optimal dispersion compensation mode in the existing optical communication field is mainly determined according to theoretical calculation according to the engineering survey data of the optical fiber line. When the engineering is opened, the dispersion compensation quantity of each node and the total residual dispersion of the system are determined according to a series of guiding principles. The problems of the method are as follows:
a) The theoretical calculation of the dispersion compensation is not universal, the theoretical calculation and the actual engineering have errors, particularly, the calculation of the nonlinear effect of the dense WDM system under the condition of long-distance transmission is quite complex, and the dispersion compensation configured according to the theoretical calculation is possibly not an optimal dispersion compensation point;
b) The precision of the residual dispersion test of the optical fiber line in engineering investigation is limited, the longer the optical fiber is, the larger the accumulated measurement error is, and the dispersion compensation determined according to the dispersion test result may not be the optimal dispersion compensation point.
The invention relates to a novel evaluation device and a method for optimal dispersion compensation of a long-distance WDM system, which do not directly measure the residual dispersion of the system, but examine the transmission performance of the system by adding a dispersion compensator on the basis of the configuration of rough theoretical calculation of the system, avoid the measurement of the residual dispersion and consider the influence of various effects which are difficult to calculate theoretically and accurately on the dispersion compensation of the system, thereby realizing the evaluation of the optimal dispersion compensation of the system.
The invention content is as follows:
the invention aims to provide an evaluation device and method for the optimal dispersion compensation of a long-distance WDM system, which mainly solve the technical problems that the theoretical calculation of the dispersion compensation in the existing method is difficult to consider various factors influencing the dispersion compensation effect and the precision of residual dispersion test is limited, and realize the evaluation of the optimal dispersion compensation of the system.
In order to solve the technical problems, the technical scheme of the invention is as follows:
an evaluation device for the optimal dispersion compensation of a long-distance WDM system is characterized by comprising a tunable dispersion compensation module, an adjustable attenuation unit, an optical power monitoring unit, an error code testing unit and a management control and data processing center; wherein:
the adjustable dispersion compensation module receives a command from a management control and data processing center and adjusts the additional dispersion of a system multiplexing section;
the adjustable attenuation unit receives a command from a management control and data processing center and adjusts the input optical power of the OTU line side;
the optical power monitoring unit monitors the input optical power of the OTU line side and reports the input optical power to the management control and data processing center;
the error code testing unit is connected to a client side optical port of the OTU to form an error code testing loop; reporting the error rate to a management control and data processing center;
the management control and data processing center manages and controls the adjustable dispersion compensation module, the adjustable attenuation unit, the optical power monitoring unit and the error code testing unit, processes data, and calculates and analyzes the optimal dispersion compensation condition.
An evaluation method for the optimal dispersion compensation of a long-distance WDM system uses the evaluation device as above, and the method steps are:
1) And connecting the evaluation device into the WDM system: connecting an adjustable dispersion compensation module before an OD of a WDM system, connecting an adjustable attenuation unit between the OD and the OTU, monitoring the input optical power of the line side of the OTU by an optical power monitoring unit, and connecting an error code testing unit to an optical port of a client side of the OTU to form an error code testing loop, wherein the system has no error code at the moment;
2) Setting the additional dispersion of the adjustable dispersion compensation module, and measuring the sensitivity of the system after transmission under the additional dispersion value by adjusting the attenuation of the adjustable attenuation unit; sequentially measuring the sensitivity of the system after transmission under other additional dispersion values;
3) Fitting the additional dispersion of 2) and the sensitivity data curve after system transmission, and analyzing and calculating the center of the curve;
4) Repeating 1) to 3), measuring the sensitivity of other typical channels after system transmission under different additional dispersion, and analyzing and calculating the additional dispersion of other typical channels under the optimal dispersion compensation;
5) The additional dispersion of a typical channel under the optimal dispersion compensation is synthesized, and the proposal of the dispersion compensation amount which should be increased or decreased on the basis of the existing dispersion compensation of the WDM system is given.
The evaluation device further comprises an optical splitter which divides the input optical power to the receiving part of the OTU and the optical power monitoring unit. ,
the evaluation device further comprises an information interaction interface, and the information interaction interface is connected with the control management center to realize that a user sends a control command and displays a result.
The adjustable dispersion compensation module is arranged at the receiving end of the optical multiplexing section layer, and a multi-channel adjustable dispersion compensation module is adopted.
The adjustable attenuator is arranged at the receiving end of the optical channel layer or the receiving end of the optical multiplexing section layer.
The fitting manner in the step 3) is gaussian fitting.
By the technical characteristics, the device and the method have the beneficial effects that:
the device and the method adopt the adjustable dispersion compensation module to adjust the dispersion and carry out fitting on the sensitivity after transmission to determine the optimal dispersion compensation of the system, thereby achieving the effect of the optimal dispersion compensation of the WDM system, saving the operation, management and maintenance cost of the WDM system and simultaneously improving the technical level of the WDM system.
Description of the drawings:
FIG. 1 is a block diagram of a WDM system;
FIG. 2 is a block diagram showing the construction of a dispersion compensation evaluating apparatus according to the present invention;
FIG. 3 is a block diagram of a dispersion compensation evaluating apparatus and its connection to a WDM system in accordance with an embodiment of the present invention;
fig. 4 is a measurement curve and fit of sensitivity and additional dispersion after transmission in an embodiment of the invention.
The specific implementation mode is as follows:
please refer to fig. 2, which is a block diagram of an apparatus for estimating optimal dispersion compensation of a long-distance WDM system according to the present invention. As shown in the figure: the system consists of an adjustable dispersion compensation module A, an adjustable attenuation unit B, an optical power monitoring unit C, an error code testing unit D and a management control and data processing center E; wherein:
the adjustable dispersion compensation module A receives a command from a management control and data processing center and adjusts the additional dispersion of a system multiplexing section;
the adjustable attenuation unit B receives a command from a management control and data processing center and adjusts the input optical power of the OTU line side;
the optical power monitoring unit C monitors the input optical power at the OTU line side and reports the input optical power to the management control and data processing center;
the error code testing unit D is connected to a client side optical port of the OTU to form an error code testing loop; reporting the error rate to a management control and data processing center;
the management control and data processing center E manages and controls the adjustable dispersion compensation module A, the adjustable attenuation unit B, the optical power monitoring unit C and the error code testing unit D, processes data, and calculates and analyzes optimal dispersion compensation conditions.
The evaluation method using the evaluation device comprises the following steps:
1) And connecting the evaluation device into the WDM system: connecting an adjustable dispersion compensation module A before an OD of a WDM system, connecting an adjustable attenuation unit B between the OD and an OTU, monitoring the input optical power of a 0TU line side by an optical power monitoring unit C, and connecting an error code testing unit D to a client side optical port of the OTU to form an error code testing loop, wherein the system has no error code at the moment;
2) Setting the additional dispersion of the adjustable dispersion compensation module A, and measuring the sensitivity of the system after transmission under the additional dispersion value by adjusting the attenuation of the adjustable attenuation unit B; sequentially measuring the sensitivity of the system after transmission under other additional dispersion values;
3) Fitting the additional dispersion of 2) and the sensitivity data curve after system transmission, and analyzing and calculating the center of the curve;
4) Repeating 1) to 3), measuring the sensitivity of other typical channels after system transmission under different additional dispersion, and analyzing and calculating the additional dispersion of other typical channels under the optimal dispersion compensation;
5) The additional dispersion of a typical channel under the optimal dispersion compensation is synthesized, and the proposal of the dispersion compensation amount which should be increased or decreased on the basis of the existing dispersion compensation of the WDM system is given.
The invention is described in further detail below with reference to a preferred embodiment in fig. 3:
the evaluation device for the optimal dispersion compensation in this example comprises an adjustable dispersion compensation module 1, an adjustable attenuator 2, a 50/50 optical splitter 3, an optical power monitoring unit 4, an error code meter 5, a control management center 6, an information interaction interface 7 and other functional modules. Wherein:
the tunable dispersion compensation module 1 is disposed at the receiving end of the OMS layer, and receives a dispersion adjustment command from the upper layer to adjust the dispersion of the system by using a multi-channel tunable dispersion compensation module, such as a GT etalon, a phase-sampling chirped bragg grating, and the like. The adjustable range and the adjustable step distance of the adjustable dispersion compensation module are determined by the dispersion tolerance of the system;
the adjustable attenuator 2 can be arranged at the receiving end of an OCh layer and also at the receiving end of an OMS layer, receives an attenuation command from a control management center 6 and adjusts the input optical power of the OTU;
a 50/50 optical splitter 3 and an optical power monitoring unit 4, where the optical splitter 3 splits the input optical power to the receiving part of the OTU1 and the optical power monitoring unit according to 50/50, and the optical splitter 3 may also be omitted, and the OTU itself completes the input optical power monitoring function;
the error code instrument 5 (such as SDH analyzer) is connected with the client side optical port of the OTU, and is matched with the adjustable attenuator 2 and the optical power monitoring unit 4 to complete the measurement of the sensitivity under a specific error code rate;
the control management center 6 controls and manages the adjustable dispersion compensation module 1, the adjustable attenuator 2, the optical power monitoring unit 4 and the error code meter 5; analyzing and processing the relation between the receiving sensitivity and the dispersion setting value of the adjustable dispersion compensation module 1, and calculating an additional dispersion value under the optimal dispersion compensation;
the information interaction interface 7 is used for realizing the control command transmission and the result display of the user.
The evaluation method of dispersion compensation using the apparatus comprises the following steps:
the first step is as follows: the optimal dispersion compensation evaluating device is accessed to the WDM system.
1) Directly connecting the transmitting part and the receiving part of the error code instrument 5 to a client side optical interface of a local OTU, and looping back a corresponding remote OTU (through a client side optical interface loop or an in-board electrical loop) to form an error code test loop, wherein the error code test loop is free of error codes; or, the sending part of the error code meter 5 may be connected to the receiving optical port of the remote OTU client side, and the receiving part of the error code meter 5 may be connected to the sending optical port of the local OTU client side. Note that while the system is error free at this point, the system is not necessarily in an optimal dispersion compensation state;
2) As shown in fig. 3, the adjustable dispersion compensation module 1, the adjustable attenuator 2 and the optical splitter 3 are connected to an error code test loop; connecting the optical power monitoring unit 4 to the other port of the optical splitter to monitor the input optical power; the information interaction interface 7 is connected to the control management center 6; the control management center 6 is connected with, can manage, control and adjust the adjustable dispersion compensation module 1 and the adjustable attenuator 2, and manages and receives reported values from the optical power monitoring unit 4;
3) And (3) zeroing the adjustable dispersion compensation module 1 and the adjustable attenuator 2, wherein the error code test loop has no error code.
The second step is that: the relationship between the additional dispersion and the sensitivity after transmission is measured.
Under the condition that the adjustable attenuator 2 is reset to zero, the adjustable dispersion compensation module 1 is adjusted to find the critical additional dispersion CD which enables the light path not to pass or has error codes min And CD max . On dispersion CD min And CD max With a step distance of delta CD Adjusting the dispersion value, delta, of a tunable dispersion compensation module CD Preferably 10 to 100ps/nm or other suitable values. For example in the case of additional dispersion in CD x In the case of (2) adjusting the adjustable attenuator, the receiver sensitivity SEN is measured x . And sequentially measuring the sensitivity of the receiver under all the additional dispersion values. The steps are automatically or semi-automatically completed by the control management center coordinating each functional module.
The third step: the data of sensitivity and additional dispersion after transmission are analyzed and processed.
1) Fitting data is selected. Find the best sensitivity SEN min Excluding the two-side ratio SEN min At least bad Delta SEN Data point of (a) SEN Recommended to be 1-3 dB, and curve fitting is carried out on the rest data.
2) Recommending Gaussian fit of the formula
y is the post-transmission sensitivity and x is the additional dispersion. Finding the center point x of the fitted curve c I.e. additional dispersion at optimal compensation;and calculating allowable additional parameters according to the power cost requirement and the fitting parameters w and ADispersion compensation range CD range 。
3) FIG. 4 is a graph of sensitivity as a function of additional dispersion after transmission, where the dotted line is the measured curve and the smooth line is the fitted curve, where x c To optimize additional dispersion under dispersion compensation. If x c 0, the system needs to reduce the negative dispersion compensation amount; on the contrary, if x c If the dispersion value is less than 0, the system needs to increase the negative dispersion compensation amount;
the fourth step: other typical channels are measured, the selection criteria of the typical channels are edge wavelengths and intermediate wavelengths including the system, and the number of the typical channels is recommended to be 3-7. Obtaining additional dispersion values of other typical channels under the optimal dispersion compensation;
the fifth step: comprehensively analyzing the additional dispersion and the additional dispersion compensation range under the optimal compensation of all typical channels, and considering the dispersion slope of the tunable dispersion compensation module 1 and the dispersion slope of the dispersion compensation module adopted by the WDM system, judging the additional dispersion compensation amount which should be added or reduced by the system.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. That is, all equivalent changes and modifications made according to the content of the claims of the present invention should be considered as the technical scope of the present invention.
Claims (7)
1. An evaluation device for the optimal dispersion compensation of a long-distance WDM system is characterized by comprising an adjustable dispersion compensation module, an adjustable attenuation unit, an optical power monitoring unit, an error code testing unit and a management control and data processing center; wherein:
the adjustable dispersion compensation module receives a command from a management control and data processing center and adjusts the additional dispersion of a system multiplexing section;
the adjustable attenuation unit receives a command from a management control and data processing center and adjusts the input optical power of the line side of the optical forwarding unit;
the optical power monitoring unit monitors the input optical power of the optical forwarding unit line side and reports the input optical power to the management control and data processing center;
the error code testing unit is connected to the client side optical port of the optical forwarding unit to form an error code testing loop; reporting the error rate to a management control and data processing center;
the management control and data processing center manages and controls the adjustable dispersion compensation module, the adjustable attenuation unit, the optical power monitoring unit and the error code testing unit, processes data, and calculates and analyzes the optimal dispersion compensation condition.
2. A method for evaluating optimum dispersion compensation of a long-haul WDM system using the evaluation apparatus according to claim 1, comprising the steps of:
1) And accessing the evaluation device into the WDM system: connecting an adjustable dispersion compensation module before a wave splitter of a WDM system, connecting an adjustable attenuation unit between the wave splitter and an optical forwarding unit, monitoring the input optical power of the line side of the optical forwarding unit by an optical power monitoring unit, and connecting an error code test unit to a client side optical port of the optical forwarding unit to form an error code test loop, wherein the system has no error code at the moment;
2) Setting the additional dispersion of the adjustable dispersion compensation module, and measuring the sensitivity of the system after transmission under the additional dispersion value by adjusting the attenuation of the adjustable attenuation unit; sequentially measuring the sensitivity of the system after transmission under other additional dispersion values;
3) Fitting the additional dispersion of 2) and the sensitivity data curve after system transmission, and analyzing and calculating the center of the curve;
4) Repeating 1) to 3), measuring the sensitivity of other typical channels after system transmission under different additional dispersion, and analyzing and calculating the additional dispersion of other typical channels under the optimal dispersion compensation;
5) The additional dispersion of a typical channel under the optimal dispersion compensation is synthesized, and the proposal of the dispersion compensation amount which should be increased or decreased on the basis of the existing dispersion compensation of the WDM system is given.
3. The method of claim 2, wherein the evaluation apparatus further comprises an optical splitter for splitting the input optical power to the receiving portion of the optical repeater unit and the optical power monitoring unit.
4. The method as claimed in claim 2, wherein the evaluation device further comprises an information exchange interface, the information exchange interface is connected to the control management center, and the information exchange interface enables a user to send control commands and display results.
5. A method for estimating optimum dispersion compensation in a long haul WDM system as claimed in claim 2, 3 or 4, wherein the tunable dispersion compensation module is disposed at the receiver end of the optical multiplexing section layer and a multi-channel tunable dispersion compensation module is employed.
6. A method for estimating optimum dispersion compensation in a long-haul WDM system as claimed in claim 2, 3 or 4, wherein said adjustable attenuator is placed at the receive end of the optical channel layer or at the receive end of the optical multiplex layer.
7. A method of estimating optimum dispersion compensation in a long-haul WDM system as claimed in claim 2, 3 or 4, wherein the fitting is a Gaussian fit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100304229A CN101132239B (en) | 2006-08-25 | 2006-08-25 | Estimation apparatus and method for optimum dispersion compensation of long-distance WDM system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100304229A CN101132239B (en) | 2006-08-25 | 2006-08-25 | Estimation apparatus and method for optimum dispersion compensation of long-distance WDM system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101132239A true CN101132239A (en) | 2008-02-27 |
| CN101132239B CN101132239B (en) | 2011-10-26 |
Family
ID=39129377
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006100304229A Expired - Fee Related CN101132239B (en) | 2006-08-25 | 2006-08-25 | Estimation apparatus and method for optimum dispersion compensation of long-distance WDM system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101132239B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN106130644A (en) * | 2016-07-20 | 2016-11-16 | 上海交通大学 | Frequency-domain equilibrium method based on dispersion overcompensation |
| CN107547166A (en) * | 2017-09-21 | 2018-01-05 | 烽火通信科技股份有限公司 | The system and method for 40G wavelength-division transmission equipment OMSP pretection switch |
| CN109983718A (en) * | 2016-11-22 | 2019-07-05 | 华为技术有限公司 | A kind of dispersion compensation method and device |
| CN114665961A (en) * | 2022-01-04 | 2022-06-24 | 武汉电信器件有限公司 | Method and system for DWDM system dispersion adjustment based on switch interconnection |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3886223B2 (en) * | 1997-09-11 | 2007-02-28 | 富士通株式会社 | Distributed control method and apparatus |
| 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 |
| JP4366225B2 (en) * | 2004-03-26 | 2009-11-18 | 富士通株式会社 | Dispersion compensation method and apparatus |
| DE102004047021B3 (en) * | 2004-09-28 | 2006-08-10 | Siemens Ag | Method and device for determining the dispersion of an optical transmission path |
-
2006
- 2006-08-25 CN CN2006100304229A patent/CN101132239B/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN106130644A (en) * | 2016-07-20 | 2016-11-16 | 上海交通大学 | Frequency-domain equilibrium method based on dispersion overcompensation |
| CN106130644B (en) * | 2016-07-20 | 2018-04-03 | 上海交通大学 | Frequency-domain equilibrium method based on dispersion overcompensation |
| CN109983718A (en) * | 2016-11-22 | 2019-07-05 | 华为技术有限公司 | A kind of dispersion compensation method and device |
| CN109983718B (en) * | 2016-11-22 | 2021-05-18 | 华为技术有限公司 | Dispersion compensation method and device |
| CN107547166A (en) * | 2017-09-21 | 2018-01-05 | 烽火通信科技股份有限公司 | The system and method for 40G wavelength-division transmission equipment OMSP pretection switch |
| CN114665961A (en) * | 2022-01-04 | 2022-06-24 | 武汉电信器件有限公司 | Method and system for DWDM system dispersion adjustment based on switch interconnection |
| CN114665961B (en) * | 2022-01-04 | 2024-02-23 | 武汉电信器件有限公司 | Method and system for DWDM system dispersion adjustment based on switch interconnection |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101132239B (en) | 2011-10-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7680419B2 (en) | Repeater and repeating method | |
| KR101295522B1 (en) | Wavelength division multiplexing system and residual dispersion compensating device and method thereof | |
| JP4053389B2 (en) | Optical signal-to-noise ratio monitoring method and optical transmission system using the same | |
| US20120219285A1 (en) | In-band optical signal to noise ratio monitoring technique | |
| US7433599B2 (en) | Automatic dispersion compensation device and compensation method | |
| JPH118590A (en) | Optical transmission system and supervisory and control method therefor | |
| US7646983B2 (en) | Apparatus and method for commissioning an optical transmission system | |
| US20040090659A1 (en) | Method of tuning wavelength tunable electro-absorption modulators | |
| CN102754367B (en) | Multichannel nonlinear compensation in optical communication link | |
| US8494360B2 (en) | In-service optical network testing | |
| US20120121257A1 (en) | Pre-emphasis control method and optical transmission system | |
| CA2398531C (en) | Optical performance monitoring for dwdm networks | |
| US8254788B2 (en) | High speed in-service optical network testing | |
| CN101132239A (en) | Estimation apparatus and method for optimum dispersion compensation of long-distance WDM system | |
| Kaeval et al. | Employing channel probing to derive end-of-life service margins for optical spectrum services | |
| Trifonovs et al. | Optimization of a standard bidirectional DWDM solution | |
| US20050226613A1 (en) | Net chromatic dispersion measurement and compensation method and system for optical networks | |
| KR101086213B1 (en) | Polarization Mode Dispersion Monitoring and Fault Correlation | |
| JP4067527B2 (en) | Method and apparatus for providing controllable second-order polarization mode dispersion | |
| EP3675390B1 (en) | Monitoring optical power of communication signals using manifestations of polarization-dependent loss at the receiver | |
| US20060067685A1 (en) | Method and arrangement for determining the dispersion of an optical transmission link | |
| Kaeval et al. | Employing Channel Probing to Derive End-of-Life Service Margins for Optical Spectrum Services. To appear in OPTICA Journal of Optical Communications and Networking | |
| Mano et al. | Measuring the Transceiver’s Back-to-Back BER-OSNR Characteristic Using Only a Variable Optical Attenuator | |
| Murakami et al. | Design and performance of the fsa submarine optical amplifier system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111026 Termination date: 20150825 |
|
| EXPY | Termination of patent right or utility model |