CN102821330B - WDM-PON (wavelength division multiplexing-passive optical network) for performing OTDR (optical time domain reflectometry) test without influencing service - Google Patents
WDM-PON (wavelength division multiplexing-passive optical network) for performing OTDR (optical time domain reflectometry) test without influencing service Download PDFInfo
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Abstract
The invention relates to a WDM-PON (wavelength division multiplexing-passive optical network) for performing OTDR (optical time domain reflectometry) test without influencing service, and the system comprises an OLT (optical line terminal) and ONU (optical network unit), which are connected with each other through an optical fiber distribution network circuit, a waveband C defined in DWDM (dense wavelength division multiplexing) is bi-directionally adopted between the OLT and the ONU as a working wavelength band, OTDR adopts a wave band L defined in DWDM as a working wavelength band, an AWG (arrayed waveguide grating) in the optical fiber distribution network circuit is periodic and can work simultaneously in the waveband C and the waveband L; a C/L WDM device in the optical fiber distribution network circuit completes complexing and division of optical signals of two working wavelength bands in the WDM-PON system and the OTDRR. The WDM-PON system for performing the OTDR test without influencing the service is simple and feasible, low in cost, high in reliability and easy to popularize. Due to the adoption of the WDM-PON system, the OTDR test can be conducted by a passive optical network system under the condition that the user service is not interrupted, and the OTDR reflected optical signal of each branch distribution optical fiber is free from being overlapped on time domain at the receiving moment of OTDR in the OTDR test.
Description
Technical field
The present invention relates to the WDM-PON system of fiber optic communication field, is a kind ofly do not affect the WDM-PON system that business carries out OTDR test specifically.
Background technology
WDM-PON(Wavelength Division Multiplexing PON, Wave division multiplexing passive optical network) be adopt wavelength division multiplexing as the EPON of access technology.It has each user bandwidth and exclusively enjoys, to realize between point-to-point special line transmission, business the mutually isolated advantage such as to be independent of each other between isolation mutually or user in wavelength-division mode, application form then has the advantage of point-to-multipoint, is the direction of soft exchange technology of future generation.
The English full name of OTDR is Optical Time Domain Reflectometer, and the Chinese meaning is optical time domain reflectometer.OTDR is the backscattering that produces of Rayleigh scattering when utilizing light to transmit in a fiber and Fresnel reflection and the optoelectronic integration instrument of the precision made, it is widely used among the maintenance of lightguide cable link, construction, can carry out the measurement of fiber lengths, the transmission attenuation of optical fiber, joint decay and fault location etc.
In the conventional passive optical network adopted based on power division optical branching device, when using OTDR to measure whole fiber distribution network (ODN:Optical Distribution Network) in OLT side, the light signal of returning from every bar branched wirings fiber reflection can be superimposed in time domain, great difficulty is brought to the analysis of line status and searching of fault, and along with optical branching device along separate routes than increase, decay on optical link will strengthen at double, also can increase the decay to reflected signal, cause resolution capability to decline.Therefore, current industry monitors the solution all cannot take out to the optical link of this EPON based on power division optical branching device.
What adopt in the fibre circuit distribution network (ODN) of WDM-PON is optical branch distribution devices based on the array waveguide grating (AWG) by Wavelength Assignment, and the light signal of different wave length can only through the port on the AWG corresponding to its wavelength.When carrying out OTDR test in such fiber optic network, OTDR only need select can through the suitable wavelength section of AWG, the reflected signal on each optical fiber distributing can be obtained in testing according to wavelength value different in wavelength period as the optical test signal of OTDR respectively, many optical fiber distributings can not occur and be reflected back signal and the thing overlapped simultaneously.
But what generally adopt on optical link in WDM-PON system at present is the load mode of single fiber bi-directional, namely be all that two-way employing respectively adheres to the wavelength of different wave length section separately for arbitrary wavelength channel, now OTDR is to test, select which kind of wavelength period all to impact online user data service, that is just will can carry out OTDR test when interrupting service.
Summary of the invention
For the defect existed in prior art, the object of the present invention is to provide a kind ofly does not affect the WDM-PON system that business carries out OTDR test, WDM-PON system adopts two-way co-wavelength section to carry user service data as operation wavelength, in optical link network, adopt duplex to make the AWG of wavelength period, the operation wavelength section of the corresponding WDM-PON system of one of them wavelength period, another one wavelength period reserves the test wavelength section as OTDR.
For reaching above object, the technical scheme that the present invention takes is:
The business that do not affect carries out a WDM-PON system for OTDR test, it is characterized in that, comprising: by fiber distribution grid line road connect OLT and ONU, the C-band defined in two-way employing DWDM therebetween as operation wavelength section,
OTDR adopts the L-band defined in DWDM as operation wavelength section,
AWG in fiber distribution grid line road is periodic, C-band and L-band can be worked in simultaneously, can on single passage simultaneously transparent transmission correspond respectively to the light signal of a certain wavelength in C-band and L-band, to be used in optical link the conjunction ripple of all light signals between trunk optical fiber to each ONU and partial wave;
C/L WDM device in fiber distribution grid line road completes conjunction ripple and the partial wave of two kinds of operation wavelength section light signals in WDM-PON system and OTDR, to be closed by the light signal of two kinds of wave bands in a trunk optical fiber.
On the basis of technique scheme, if C1, C2 are until Cn is the wavelength value defined in C-band, C1, C2 is passed through between OLT and each ONU in normal work ... the two-way transmission user data of light signal of each wavelength of Cn, wherein: the bidirectional service data between C1 wavelength carrying OLT to ONU1, bidirectional service data between C2 wavelength carrying OLT to ONU2, the rest may be inferred, the bidirectional service data between Cn wavelength carrying OLT to ONUn.
On the basis of technique scheme, described OTDR can send L1, L2 respectively ... the test pulse light signal of each wavelength of Ln, for measurement and the monitoring of branched wirings optical fiber each in optical link, wherein: the optical link state measuring OLT to ONU1 when exporting the light signal of L1 wavelength, the optical link state of OLT to ONU2 is measured when exporting the light signal of L2 wavelength, the rest may be inferred, measures the optical link state of OLT to ONUn when exporting the light signal of Ln wavelength.
Of the present inventionly do not affect the WDM-PON system that business carries out OTDR test, under not traffic affecting condition can to each branched wirings optical fiber respectively, timesharing carries out OTDR test, WDM-PON system adopts two-way co-wavelength section to carry user service data as operation wavelength, in optical link network, adopt duplex to make the AWG of wavelength period, the operation wavelength section of the corresponding WDM-PON system of one of them wavelength period, another one wavelength period reserves the test wavelength section as OTDR.Its beneficial effect is:
1) effectively prevent the reflected signal that each branched wirings optical fiber occurs when OTDR tests in the passive optical network based on power division optical branching device to overlap the problem that cannot differentiate.
2) because the insertion loss of AWG in optical link network is much smaller than the insertion loss of power division optical branching device, be conducive to the received signal quality improving OTDR, increase measuring distance.
3) solve in current WDM-PON system and cannot accomplish do not affecting the problem of carrying out OTDR test under online user's data professional qualification in two-way employing different wave length section respectively.
Accompanying drawing explanation
The present invention has following accompanying drawing:
Fig. 1 WDM-PON system architecture diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
The present invention proposes a kind of WDM-PON system of novelty, in the identical wavelength period of two-way employing as operation wavelength, duplex is adopted to make the AWG of wavelength period in optical link network, the operation wavelength section of the corresponding WDM-PON system of one of them wavelength period, another one wavelength period reserves the test wavelength section as OTDR.
The structure composed of system as shown in Figure 1, does not of the present inventionly affect the WDM-PON system that business carries out OTDR test, comprising:
By OLT and the ONU that fiber distribution grid line road connects, between the two (referring to OLT and ONU) the intensive multiplexed optical wave of two-way employing DWDM(with) in the C-band of definition as operation wavelength section, C1, C2 is until Cn is the wavelength value defined in C-band, C1 is passed through between OLT and each ONU in normal work, C2 ... the two-way transmission user data of light signal of each wavelength of Cn, wherein: the bidirectional service data between C1 wavelength carrying OLT to ONU1, bidirectional service data between C2 wavelength carrying OLT to ONU2, the rest may be inferred, bidirectional service data between Cn wavelength carrying OLT to ONUn,
OTDR adopts the L-band defined in DWDM as operation wavelength section, L1, L2 can be sent respectively ... the test pulse light signal of each wavelength of Ln, for measurement and the monitoring of branched wirings optical fiber each in optical link, wherein: the optical link state measuring OLT to ONU1 when exporting the light signal of L1 wavelength, the optical link state of OLT to ONU2 is measured when exporting the light signal of L2 wavelength, the rest may be inferred, measures the optical link state of OLT to ONUn when exporting the light signal of Ln wavelength;
Above-mentioned middle n is positive integer, and value is 1,2,3,4,
AWG in fiber distribution grid line road is periodic, C-band and L-band (AWG adopting duplex to make wavelength period realizes) can be worked in simultaneously, can on single passage simultaneously transparent transmission correspond respectively to the light signal of a certain wavelength in C-band and L-band, to be used in optical link the conjunction ripple of all light signals between trunk optical fiber to each ONU and partial wave;
C/L WDM device in fiber distribution grid line road completes conjunction ripple and the partial wave of two kinds of operation wavelength section light signals in WDM-PON system and OTDR, to be closed by the light signal of two kinds of wave bands in a trunk optical fiber.
In the present invention, because the AWG in fiber distribution grid line road is periodic, the channel of C-band and the channel of L-band have collimation, so after this system recorded the optical channel characteristic of the L-band respective channels of certain branch optical fiber, the channel situation of flashlight place C-band also can be derived, thus achieves circuit (channel) monitoring function to client signal channel.
The present invention succeeds application in systems in which, proves that the method is simple, with low cost after tested after checking, and reliability high, be easy to promote.Achieve passive optical network and can carry out OTDR test under the condition of not interrupting customer service, and there is the overlap in time domain when OTDR receives in the OTDR reflected light signal that each branched wirings optical fiber can not occur in OTDR test.
The content be not described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.
Claims (2)
1. one kind does not affect the WDM-PON system that business carries out OTDR test, it is characterized in that, comprise: OLT and the ONU connected by fiber distribution grid line road, therebetween the C-band defined in two-way employing DWDM transmits user data, OTDR adopts the L-band defined in DWDM to carry out measurement and detection
AWG in fiber distribution grid line road is periodic, C-band and L-band can be worked in simultaneously, can on single passage simultaneously transparent transmission correspond respectively to the light signal of a certain wavelength in C-band and L-band, to be used in optical link the conjunction ripple of all light signals between trunk optical fiber to each ONU and partial wave;
C/L WDM device in fiber distribution grid line road completes conjunction ripple and the partial wave of two kinds of operation wavelength section light signals in WDM-PON system and OTDR, to be closed by the light signal of two kinds of wave bands in a trunk optical fiber;
Described OTDR can send L1, L2 respectively ... the test pulse light signal of each wavelength of Ln, for measurement and the monitoring of branched wirings optical fiber each in optical link, wherein: the optical link state measuring OLT to ONU1 when exporting the light signal of L1 wavelength, the optical link state of OLT to ONU2 is measured when exporting the light signal of L2 wavelength, the rest may be inferred, measures the optical link state of OLT to ONUn when exporting the light signal of Ln wavelength.
2. do not affect the WDM-PON system that business carries out OTDR test as claimed in claim 1, it is characterized in that: set C1, C2 until the wavelength value of Cn as defining in C-band, C1, C2 is passed through between OLT and each ONU in normal work ... the two-way transmission user data of light signal of each wavelength of Cn, wherein: the bidirectional service data between C1 wavelength carrying OLT to ONU1, bidirectional service data between C2 wavelength carrying OLT to ONU2, the rest may be inferred, the bidirectional service data between Cn wavelength carrying OLT to ONUn.
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| CN201210303047.6A CN102821330B (en) | 2012-08-24 | 2012-08-24 | WDM-PON (wavelength division multiplexing-passive optical network) for performing OTDR (optical time domain reflectometry) test without influencing service |
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| CN104009794B (en) * | 2013-02-22 | 2017-02-08 | 中兴通讯股份有限公司 | Method and apparatus for detecting fault in optical fiber of passive optical network |
| CN104009795A (en) * | 2013-02-25 | 2014-08-27 | 中兴通讯股份有限公司 | OTDR optical path detection device and method thereof |
| CN103560826B (en) * | 2013-11-21 | 2015-11-18 | 国家电网公司 | A kind of multistagely non-ly divide equally EPON network fiber fault testing method |
| EP3119015B1 (en) | 2014-04-10 | 2020-07-22 | Huawei Technologies Co., Ltd. | Optical time domain reflectometer implementation apparatus and system |
| CN106411397A (en) * | 2015-07-27 | 2017-02-15 | 中兴通讯股份有限公司 | Intelligent optical distribution network (ODN) device and passive optical network (PON) system |
| CN106911378A (en) * | 2015-12-23 | 2017-06-30 | 中国电信股份有限公司 | Realize method, management system and the optical time domain reflectometer equipment of light path detection |
| CN106911379A (en) * | 2015-12-23 | 2017-06-30 | 中国电信股份有限公司 | Realize method, management system and the optical time domain reflectometer equipment of light path detection |
| CN106230499A (en) * | 2016-07-26 | 2016-12-14 | 桂林聚联科技有限公司 | A kind of fiber optic cable monitor device of tree-shaped fiber cable network |
| CN110034818A (en) * | 2018-12-17 | 2019-07-19 | 潘子俊 | A kind of device and system carrying out fiber optic cable monitor based on intelligent optical fiber distribution system |
| CN113329277B (en) * | 2020-02-29 | 2022-07-29 | 华为技术有限公司 | Method and apparatus for optical communication |
| CN114499655B (en) * | 2021-11-23 | 2023-05-16 | 烽火通信科技股份有限公司 | Method and device for improving OTDR event identification |
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| KR100971676B1 (en) * | 2008-10-09 | 2010-07-22 | 한국과학기술원 | A Fault Localization Method and A Fault Localization Apparatus in A Passive Optical Network and A Passive Optical Network Having the Same |
| CN102170309B (en) * | 2011-03-24 | 2014-06-11 | 索尔思光电（成都）有限公司 | Optical line terminal (OLT) optical module integrating optical time domain reflectometer (OTDR) monitoring function |
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