CN1920601A - Method for setting G653 optical fiber dense wavelength division multiplex used system dispersion compensation module - Google Patents
Method for setting G653 optical fiber dense wavelength division multiplex used system dispersion compensation module Download PDFInfo
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Abstract
The invention relates to a chromatic aberration compensation module setting method of G.653 fiber tight wavelength-division multiplex system, wherein it comprises: setting the chromatic aberration compensation module with preset chromatic aberration compensation distance; setting the chromatic aberration slop of said module same as chromatic aberration slop of G.653 fiber, while its symbol is inversed to the chromatic aberration slop of G.653 fiber, and setting the zero chromatic aberration wavelength of module higher than the zero chromatic aberration wavelength of G.653 fiber; based on said chromatic aberration compensation absolute distance, calculating the chromatic aberration compensation value and combining said chromatic aberration compensation modules, to make the left chromatic aberration of said wavelength-division multiplex system as positive chromatic aberration, while said positive chromatic aberration is inside the chromatic aberration allowance range. The invention uses combined chromatic aberration compensation module method, to simplify the system chromatic aberration compensation design and needed system chromatic aberration compensation effect, to optimize the system transmission property and reduce the cost.
Description
Technical field
The present invention relates to optical transport technology, relate in particular to a kind of G.653 optical fiber C-band dwdm system dispersion compensation module parameter setting method.
Background technology
The Transmission Fibers of optical fiber communication has experienced from the multimode to the single mode, from development course G.652-＞G.653-＞G.655.Though it is G.652 the optical fiber loss is little, big in the chromatic dispersion of 1550nm window; Though G.653 optical fiber is little in the chromatic dispersion of 1550nm window, (Dense Wavelength DivisionMultiplexing DWDM) is easy to generate four-wave mixing effect in the system, cause serious transmission impairment in dense wave division multipurpose.At present, a large amount of G.653 optical fiber has been laid by countries such as Japan, Latin America, how to improve the transmission performance of dwdm system on optical fiber G.653 and becomes a difficult problem that presses for solution.
G.653, the ITU-T suggestion has provided G.653 optical fiber index request and canonical parameter in (12/2003) (characteristic of dispersion-shifted single-mode fiber) " Characteristics ofa dispersion-shifted single-mode optical fibre and cable " lining.G.653 the canonical parameter of optical fiber sees the following form:
| Attribute (Attribute) | Content (Detail) | Value (Value) |
| Attenuation coefficient (Attenuation coefficient) | Wavelength (Wavelength) | Typical case's connection value (Typical link value) |
| 1550nm | 0.275dB/km | |
| 1625nm | (TBD) undetermined | |
| Dispersion parameters (Chromatic dispersion parameters) | λ 0typ | 1550nm |
| S 0typ | 0.07ps/(nm 2× km) |
Chinese patent application (publication number CN1488958, " dispersion compensation method and device in the transmission of dispersion shifted optical fiber C-band wavelength-division signal "), dispersion compensation method in a kind of dispersion shifted optical fiber C-band wavelength-division signal transmission is disclosed, this method is red wavestrip and blue wavestrip with red blue zone channel-splitting filter with the dense wave division multipurpose signal decomposition at first, adopt the negative dispersion compensation module that red wavestrip signal is compensated again, adopt the positive dispersion compensation module that blue wavestrip signal is compensated, use the signal behind the red blue wavestrip wave multiplexer superimposing compensation at last.
The dispersion compensation schemes complexity of Chinese patent application CN1488958, the system cost height, the residual dispersion of each passage may differ bigger in long distance D wdm system.
In recent years along with the development of dispersion compensation technology, be that the novel dispersion compensation technology of representative reaches its maturity with warble (Chirp) FBG and GT etalon, be successfully applied to G.652 fiber DWDM system at present.
G.653 the conventional thinking of dispersion compensation is that the dispersion compensation module that chromatic dispersion gradient is opposite, zero-dispersion wavelength is identical is set, in order to compensate the G.653 chromatic dispersion of optical fiber link.But like this and improper because be difficult to accomplish full remuneration under a lot of situation, can cause usually system residual dispersion some be negative dispersion.Though system can tolerate certain negative dispersion, system works is not optimum dispersion compensation point under negative dispersion.
According to ITU-T suggestion G.696.1 (07/2005) (the DWDM application territory of longitudinal compatibility in) " Longitudinally compatible intra-domain DWDM applications " appendix I.2.4, see accompanying drawing 1, since optical fiber from phase modulation (PM) (Self-Phase Modulation, SPM) effect, can produce certain compensating action to the chromatic dispersion of system, so system residual chromatic dispersion is preferably positive dispersion, the size of positive dispersion amount and the incident optical power of system, link to stride hop count, fiber type, optical convering unit type relevant.
Summary of the invention
The invention provides a kind of G.653 optical fiber dense wavelength division multiplex used system compensating module method to set up, be intended to solve prior art middle and long distance G.653 optical fiber dense wavelength division multiplex used system compensation scheme complexity, system cost problem of higher.
To achieve these goals, the invention provides a kind of G.653 optical fiber dense wavelength division multiplex used system compensating module method to set up, comprise the steps:
Setting has the dispersion compensating block series of predetermined chromatic dispersion complementary range series;
Set the chromatic dispersion gradient numerical value of described dispersion compensating block series and G.653 the CHROMATIC DISPERSION IN FIBER OPTICS slope equate, symbol and G.653 the CHROMATIC DISPERSION IN FIBER OPTICS slope is opposite, the zero-dispersion wavelength of setting described dispersion compensating block series is greater than the zero-dispersion wavelength of optical fiber G.653;
Calculate chromatic dispersion compensation quantity and make up described dispersion compensating block series according to the dispersion compensation absolute distance, making the residual dispersion of the described G.653 optical fiber dense wavelength division multiplex system that disposes described dispersion compensating block series is positive dispersion, and described positive dispersion is in the chromatic dispersion tolerance of described system.
Above-mentioned method, its characteristics are that described predetermined chromatic dispersion complementary range series is 50km, 100km, 200km and 500km.
Above-mentioned method, its characteristics are that the described chromatic dispersion gradient of described G.653 optical fiber and described dispersion compensating block series and described zero-dispersion wavelength are assembly average.
Above-mentioned method, its characteristics be, the chromatic dispersion gradient of described dispersion compensating block series is set at 0.07ps/ (nm2 * km).
Above-mentioned method, its characteristics are, if described G.653 CHROMATIC DISPERSION IN FIBER OPTICS slope greater than 0.07ps/ (nm2 * km), then the dispersion compensation absolute distance be reality G.653 fiber distance multiply by described G.653 CHROMATIC DISPERSION IN FIBER OPTICS slope and divided by 0.07ps/ (nm2 * km).
Above-mentioned method, its characteristics are that the zero-dispersion wavelength of described dispersion compensation module is set at 1551nm～1553nm.
Above-mentioned method, its characteristics are, if the zero-dispersion wavelength of described G.653 optical fiber is not equal to 1550nm, then the zero-dispersion wavelength value of the described dispersion compensation module zero-dispersion wavelength value that is set at described G.653 optical fiber adds 1nm～3nm.
Above-mentioned method, its characteristics are that the residual dispersion of described system comprises the accumulated chromatic dispersion of dispersion compensation point and the total dispersion of described system.
Above-mentioned method, its characteristics are that described chromatic dispersion compensation quantity is that described dispersion compensation absolute distance multiply by 100 divided by 100 merchant, adds 100.
Above-mentioned method, its characteristics be, if described dispersion compensation absolute distance divided by 100 remainder greater than 50, then described chromatic dispersion compensation quantity is that described chromatic dispersion compensation quantity is that described dispersion compensation absolute distance multiply by 100 divided by 100 merchant, adds 150.
Said method has adopted the method for combination dispersion compensation module series, has simplified the system dispersion Compensation Design, has taken into account the dispersion compensation effect of system, has optimized the system transmissions performance, has reduced system's operation cost simultaneously.
Description of drawings
Fig. 1 is the dispersion characteristics of system channel in the prior art;
Fig. 2 is the process flow diagram of Parameters design of the present invention.
Embodiment
Specific embodiments of the present invention further describes by Fig. 2.This method comprises the steps:
Step S1: the dispersion compensating block series of determining to have predetermined chromatic dispersion complementary range series.
G.653 the code requirement of optical fiber is that abbe number absolute value maximum between 1525～1575nm should be less than 3.5ps/ (nm * km).The G.653 optical fiber of laying in the actual engineering negative dispersion pact-2ps/ maximum in C-band 1530～1565nm (about nm * km) or absolute value littler.Consider the dispersion tolerance of existing 10Gb/s system and CHROMATIC DISPERSION IN FIBER OPTICS G.653, the minimal dispersion compensation of determining dispersion compensation module G.653 is apart from being 50km.Consider various dispersion compensations apart from the convenience of combination and the link range of actual engineering, determine that other dispersion compensation distances are 100km, 200km, 500km.
To sum up, the dispersion compensation of dispersion compensation module is 50km, 100km, 200km, 500km apart from series.According to actual conditions, also can select other suitable dispersion complementary ranges as the module model.
Step S2: chromatic dispersion gradient and zero-dispersion wavelength that dispersion compensation module is set.
G.653 the chromatic dispersion gradient of optical fiber and dispersion compensation module and zero-dispersion wavelength all refer to assembly average, and it is bigger to allow individually G.653 fiber segment and dispersion compensation module to depart from statistical value.
(nm2 * km), zero-dispersion wavelength is more bigger than the representative value 1550nm in G.653 advising, the preferred 1～3nm of the present invention is 1551～1553nm for the representative value 0.07ps/ that the chromatic dispersion gradient of dispersion compensation module is designed to G.653 advise.
(nm2 * km) bigger then should note the actual complementary range of dispersion compensation module when system configuration designs if actual G.653 CHROMATIC DISPERSION IN FIBER OPTICS slope departs from the representative value 0.07ps/ of G.653 suggestion.Such as certain G.653 the chromatic dispersion gradient measured value of optical fiber link be that (nm2 * km), think that then it is 1.143 times (0.08/0.07) of actual range that system needs the distance of dispersion compensation, chromatic dispersion gradient still are 0.07ps/ (nm2 * km) to 0.08ps/.
If it is too big that the zero-dispersion wavelength of actual G.653 optical fiber departs from the representative value 1550nm of G.653 suggestion, then should redesign the zero-dispersion wavelength of dispersion compensation module, than the big 1～3nm of real system zero-dispersion wavelength measured value.
Below further analyze dispersion compensation module zero-dispersion wavelength than the reason of the bigger 1～3nm of zero-dispersion wavelength of optical fiber G.653:
If G.653 the CHROMATIC DISPERSION IN FIBER OPTICS slope is a1 (a1＞0), zero-dispersion wavelength is b1 (about 1550nm), transmission range c1, and chromatic dispersion is: CD1=c1a1 (λ-b1)
The loose chromatic dispersion gradient of compensating module of filling in colors on a sketch is a2 (a2＜0), and zero-dispersion wavelength is b2, and the equivalent compensation distance is c2, and chromatic dispersion is: and CD2=c2a2 (λ-b2)
When a2=-a1, so system residual chromatic dispersion has:
CD＝a1[(c1-c2)λ-(c1b1-c2b2)]
When c1=c2, when having only b2＞b1, system residual chromatic dispersion＞0.The zero-dispersion wavelength that shows dispersion compensation module must be greater than the zero-dispersion wavelength of optical fiber G.653.
When c1 ≠ c2, have after the conversion:
Wherein
Zero-dispersion wavelength for system residual chromatic dispersion.
According to the dispersion compensation experience of fiber DWDM system G.653, the residual dispersion in short wavelength zone should be greater than the chromatic dispersion in long wavelength zone, so c2＞c1 is arranged, just dispersion compensation length should be greater than fiber lengths G.653.
If b1=b2, b3=b1 then, then the zero-dispersion wavelength of system residual chromatic dispersion is with G.653 optical fiber is consistent, and some wavelength of system is in negative dispersion;
If b1＞b2, b3＜b1 then, then C-band is in negative dispersion in some long wavelength zone inevitably;
If b1＜b2, b3＞b1 then, then the C-band chromatic dispersion of system may all be positive dispersion.
(Δ is about 1～3nm) to recommend the b2=b1+ Δ.If b2 is excessive, can cause overall dispersion to be bigger positive dispersion, improper.So selecting Δ is 1～3nm.
Step S3: the layoutprocedure of determining dispersion compensation module.
Than just needing dispersion compensation under the longer transmission distance, with the dispersion compensation configuration of other dwdm systems, need to consider the accumulated chromatic dispersion of dispersion compensation point and the total dispersion of system in principle.The dispersion compensation rule of formulating according to the dispersion tolerance of CHROMATIC DISPERSION IN FIBER OPTICS characteristic and existing system G.653 is as follows: if G.653 the distance of optical fiber is 100 * n+r (0≤r＜100, n is an integer), when 0≤r＜50, chromatic dispersion compensation quantity is 100 * (n+1); When 100＞r 〉=50, chromatic dispersion compensation quantity is 100 * (n+1)+50.Above unit is km.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; being familiar with those of ordinary skill in the art ought can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (10)
1, a kind of G.653 optical fiber dense wavelength division multiplex used system compensating module method to set up is characterized in that, comprises the steps:
Setting has the dispersion compensating block series of predetermined chromatic dispersion complementary range series;
Set the chromatic dispersion gradient numerical value of described dispersion compensating block series and G.653 the CHROMATIC DISPERSION IN FIBER OPTICS slope equate, symbol and G.653 the CHROMATIC DISPERSION IN FIBER OPTICS slope is opposite, the zero-dispersion wavelength of setting described dispersion compensating block series is greater than the zero-dispersion wavelength of optical fiber G.653;
Calculate chromatic dispersion compensation quantity and make up described dispersion compensating block series according to the dispersion compensation absolute distance, making the residual dispersion of the described G.653 optical fiber dense wavelength division multiplex system that disposes described dispersion compensating block series is positive dispersion, and described positive dispersion is in the chromatic dispersion tolerance of described system.
2, method according to claim 1 is characterized in that, described predetermined chromatic dispersion complementary range series is 50km, 100km, 200km and 500km.
3, method according to claim 1 and 2 is characterized in that, the described chromatic dispersion gradient of described G.653 optical fiber and described dispersion compensating block series and described zero-dispersion wavelength are assembly average.
4, method according to claim 1 and 2 is characterized in that, the chromatic dispersion gradient of described dispersion compensating block series is set at 0.07ps/ (nm2 * km).
5, method according to claim 4, it is characterized in that, if described G.653 CHROMATIC DISPERSION IN FIBER OPTICS slope greater than 0.07ps/ (nm2 * km), then the dispersion compensation absolute distance be reality G.653 fiber distance multiply by described G.653 CHROMATIC DISPERSION IN FIBER OPTICS slope and divided by 0.07ps/ (nm2 * km).
6, method according to claim 1 is characterized in that, the zero-dispersion wavelength of described dispersion compensation module is set at 1551nm～1553nm.
7, method according to claim 6 is characterized in that, if the zero-dispersion wavelength of described G.653 optical fiber is not equal to 1550nm, then the zero-dispersion wavelength value of the described dispersion compensation module zero-dispersion wavelength value that is set at described G.653 optical fiber adds 1nm～3nm.
8, method according to claim 1 is characterized in that, the residual dispersion of described system comprises the accumulated chromatic dispersion of dispersion compensation point and the total dispersion of described system.
9, method according to claim 1 is characterized in that, described chromatic dispersion compensation quantity is that described dispersion compensation absolute distance multiply by 100 divided by 100 merchant, adds 100.
10, method according to claim 9, it is characterized in that, if greater than 50, then described chromatic dispersion compensation quantity is that described chromatic dispersion compensation quantity is that described dispersion compensation absolute distance multiply by 100 divided by 100 merchant to described dispersion compensation absolute distance, adds 150 divided by 100 remainder.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102883650A (en) * | 2010-06-25 | 2013-01-16 | 奥林巴斯医疗株式会社 | Endoscope device |
| CN111416664A (en) * | 2019-01-07 | 2020-07-14 | 中国移动通信有限公司研究院 | Dispersion compensation method, device and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109412694A (en) * | 2017-08-17 | 2019-03-01 | 上海长弋通信技术有限公司 | A kind of 1550nm extra long distance DTV fibre-optic transmission system (FOTS) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1266499C (en) * | 2002-10-10 | 2006-07-26 | 华为技术有限公司 | Method and apparatus for compensating dispersion for dispersion displacement optical fiber c waveband wave division signal transmission |
| JP4481014B2 (en) * | 2004-01-06 | 2010-06-16 | 株式会社フジクラ | Optical fiber transmission line |
| JP2006100909A (en) * | 2004-09-28 | 2006-04-13 | Nec Corp | Waveform division multiplex optical transmission system, optical transmitter, relay node and waveform division multiplex optical transmission method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102883650A (en) * | 2010-06-25 | 2013-01-16 | 奥林巴斯医疗株式会社 | Endoscope device |
| CN111416664A (en) * | 2019-01-07 | 2020-07-14 | 中国移动通信有限公司研究院 | Dispersion compensation method, device and storage medium |
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