CN102821330A - 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 of WDM-PON system that business is carried out the OTDR test that do not influence specifically.
Background technology
WDM-PON (Wavelength Division Multiplexing PON, Wave division multiplexing passive optical network) adopts the EPON of wavelength division multiplexing as access technology.It has each user bandwidth exclusively enjoy, with the wavelength-division mode realize that point-to-point special line transmits, isolate mutually between the business or the user between isolate advantage such as be independent of each other each other; The advantage that on application form, then has point-to-multipoint is the direction of light access 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 produced of Rayleigh scattering and the Fresnel reflection when utilizing light in optical fiber, to transmit and the optoelectronic integration instrument of the precision processed; It is widely used among the maintenance, construction of lightguide cable link, can carry out the measurement of the decay of transmission attenuation, joint and the fault location etc. of fiber lengths, optical fiber.
In the conventional passive optical network that adopts based on the power division optical branching device; When use OTDR to whole optical fiber distribution network (ODN:Optical Distribution Network) when measuring in the OLT side; The light signal of returning from every branched wirings fiber reflection can be superimposed in time domain; Bring great difficulty for the analysis and the searching of fault of line status, and along with optical branching device along separate routes than increase, the decay on the optical link will strengthen at double; Also can increase decay, cause resolution capability to descend reflected signal.Therefore, present industry solution that the optical link monitoring of this EPON based on the power division optical branching device all cannot take out.
The optical branch distribution devices that is based on the array waveguide grating (AWG) by Wavelength Assignment that in the fibre circuit distribution network (ODN) of WDM-PON, adopts, wavelength optical signals can only be passed the port on the pairing AWG of its wavelength.When in such fiber optic network, carrying out the OTDR test; OTDR only need select the suitable wavelength section that can pass AWG for use; In test, can obtain the reflected signal on each optical fiber distributing respectively as the optical tests signal of OTDR, many optical fiber distributings reflected back signals and the thing that overlaps simultaneously can not take place according to different wavelengths value in the wavelength period.
But what on optical link, generally adopt in the WDM-PON system at present is the load mode of single fiber bi-directional; All be the two-way wavelength that adheres to the different wave length section separately that adopts respectively promptly as far as arbitrary wavelength channel; This moment, OTDR was if will test; Select which kind of wavelength period all can online user data service to be impacted, that is to say and under the situation of interrupting service, just can carry out the OTDR test.
Summary of the invention
To the defective that exists in the prior art; The object of the present invention is to provide a kind of WDM-PON system that business is carried out the OTDR test that do not influence; The WDM-PON system adopts two-way co-wavelength section to carry user service data as operation wavelength; In the optical link network, adopt duplex to make the AWG of wavelength period, the operation wavelength section of the corresponding WDM-PON of one of them wavelength period system, the another one wavelength period is reserved the test wavelength period as OTDR.
For reaching above purpose, the technical scheme that the present invention takes is:
A kind ofly do not influence the WDM-PON system that business is carried out OTDR test, it is characterized in that, comprising: through OLT and the ONU that fiber distribution grid line road connects, the C-band that defines among the two-way employing DWDM between the two is as the operation wavelength section,
OTDR adopts the L-band that defines among the DWDM as the operation wavelength section,
AWG in the fiber distribution grid line road is periodic; Can work in C-band and L-band simultaneously; Can be on single passage simultaneously transparent transmission correspond respectively to the light signal of a certain wavelength in C-band and the L-band, be used for accomplishing trunk optical fiber in the optical link and close ripple and partial wave to all light signals between each ONU;
What C/L WDM device in the fiber distribution grid line road was accomplished two kinds of operation wavelength section light signals among WDM-PON system and the OTDR closes ripple and partial wave, so that the light signal of two kinds of wave bands is closed in the trunk optical fiber.
On the basis of technique scheme; If C1, C2 are the wavelength value that defines in the C-band until Cn; Pass through C1, C2 in the operate as normal between OLT and each ONU ... The two-way transmission user data of the light signal of each wavelength of Cn, wherein: the C1 wavelength carries the two-way services data between the OLT to ONU1, and the C2 wavelength carries the two-way services data between the OLT to ONU2; The rest may be inferred, and the Cn wavelength carries the two-way services data between the OLT to ONUn.
On the basis of technique scheme; Said OTDR can send L1, L2 respectively ... The test pulse light signal of each wavelength of Ln; Be used for the measurement and the monitoring of each branched wirings optical fiber of optical link, wherein: when the light signal of output L1 wavelength, measure the optical link state of OLT to ONU1, measure the optical link state of OLT to ONU2 during the light signal of output L2 wavelength; The rest may be inferred, measures the optical link state of OLT to ONUn during the light signal of output Ln wavelength.
The business that do not influence of the present invention is carried out the WDM-PON system that OTDR tests; Under traffic affecting condition not can to each branched wirings optical fiber respectively, timesharing carries out the OTDR test; The WDM-PON system adopts two-way co-wavelength section to carry user service data as operation wavelength; In the optical link network, adopt duplex to make the AWG of wavelength period, the operation wavelength section of the corresponding WDM-PON of one of them wavelength period system, the another one wavelength period is reserved the test wavelength period as OTDR.Its beneficial effect is:
1) effectively avoided taking place when OTDR tests in the passive optical network of power division optical branching device the problem that the reflected signal of each branched wirings optical fiber overlaps and can't differentiate.
2) because of the insertion loss of the insertion loss of AWG in the optical link network much smaller than the power division optical branching device, help improving the received signal quality of OTDR, increase measuring distance.
3) solve in the present WDM-PON system two-way and adopt the different wave length section respectively and can't accomplish do not influencing the problem of carrying out the OTDR test under online user's data professional qualification.
Description of drawings
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 done further explain.
The present invention proposes a kind of WDM-PON system of novelty; In the identical wavelength period of two-way employing as operation wavelength; Adopt duplex to make the AWG of wavelength period in the optical link network; The operation wavelength section of the corresponding WDM-PON of one of them wavelength period system, the another one wavelength period is reserved the test wavelength period as OTDR.
The composition framework of system as shown in Figure 1, the business that do not influence of the present invention is carried out the WDM-PON system that OTDR tests, and comprising:
OLT and ONU through the connection of fiber distribution grid line road; The C-band of definition is as the operation wavelength section among the two-way employing DWDM between the two (referring to OLT and ONU) (intensive multiplexed optical wave is used); C1, C2 are the wavelength value that defines in the C-band until Cn; Pass through C1, C2 in the operate as normal between OLT and each ONU ... The two-way transmission user data of the light signal of each wavelength of Cn, wherein: the C1 wavelength carries the two-way services data between the OLT to ONU1, and the C2 wavelength carries the two-way services data between the OLT to ONU2; The rest may be inferred, and the Cn wavelength carries the two-way services data between the OLT to ONUn;
OTDR adopts the L-band that defines among the DWDM as the operation wavelength section; Can send L1, L2 respectively ... The test pulse light signal of each wavelength of Ln; Be used for the measurement and the monitoring of each branched wirings optical fiber of optical link, wherein: when the light signal of output L1 wavelength, measure the optical link state of OLT to ONU1, measure the optical link state of OLT to ONU2 during the light signal of output L2 wavelength; The rest may be inferred, measures the optical link state of OLT to ONUn during the light signal of output Ln wavelength;
N is a positive integer in above-mentioned, and value is 1,2,3,4,
AWG in the fiber distribution grid line road is periodic; Can work in C-band and L-band (AWG that adopts duplex to make wavelength period realizes) simultaneously; Can be on single passage simultaneously transparent transmission correspond respectively to the light signal of a certain wavelength in C-band and the L-band, be used for accomplishing trunk optical fiber in the optical link and close ripple and partial wave to all light signals between each ONU;
What C/L WDM device in the fiber distribution grid line road was accomplished two kinds of operation wavelength section light signals among WDM-PON system and the OTDR closes ripple and partial wave, so that the light signal of two kinds of wave bands is closed in the trunk optical fiber.
Among the present invention; Because the AWG in the fiber distribution grid line road is periodic; The channel of C-band and the channel of L-band have collimation; So this system has recorded after the optical channel characteristic of L-band respective channels of certain branch optical fiber, the channel situation of flashlight place C-band also can derive out, thereby has realized circuit (channel) monitoring function to the client signal channel.
The present invention's application of in system, having succeeded, this method of proof is simple, with low cost after testing authentication, and reliability high, be easy to promote.Realized that passive optical network can carry out OTDR test under the condition of not interrupting customer service, and overlapping on the time domain, OTDR takes place when receiving in the OTDR reflected light signal that each branched wirings optical fiber can not take place in the OTDR test.
The content of not doing in this specification to describe in detail belongs to this area professional and technical personnel's known prior art.
Claims (3)
1. one kind does not influence the WDM-PON system that business is carried out OTDR test, it is characterized in that, comprising: through OLT and the ONU that fiber distribution grid line road connects, the C-band that defines among the two-way employing DWDM between the two is as the operation wavelength section,
OTDR adopts the L-band that defines among the DWDM as the operation wavelength section,
AWG in the fiber distribution grid line road is periodic; Can work in C-band and L-band simultaneously; Can be on single passage simultaneously transparent transmission correspond respectively to the light signal of a certain wavelength in C-band and the L-band, be used for accomplishing trunk optical fiber in the optical link and close ripple and partial wave to all light signals between each ONU;
What C/L WDM device in the fiber distribution grid line road was accomplished two kinds of operation wavelength section light signals among WDM-PON system and the OTDR closes ripple and partial wave, so that the light signal of two kinds of wave bands is closed in the trunk optical fiber.
2. the business that do not influence as claimed in claim 1 is carried out the WDM-PON system that OTDR tests; It is characterized in that: establish C1, C2 is the wavelength value that defines in the C-band until Cn; Pass through C1, C2 in the operate as normal between OLT and each ONU ... The two-way transmission user data of the light signal of each wavelength of Cn; Wherein: the C1 wavelength carries the two-way services data between the OLT to ONU1; The C2 wavelength carries the two-way services data between the OLT to ONU2, and the rest may be inferred, and the Cn wavelength carries the two-way services data between the OLT to ONUn.
3. the business that do not influence as claimed in claim 1 is carried out the WDM-PON system that OTDR tests; It is characterized in that: said OTDR can send L1, L2 respectively ... The test pulse light signal of each wavelength of Ln; Be used for the measurement and the monitoring of each branched wirings optical fiber of optical link; Wherein: the optical link state of when exporting the light signal of L1 wavelength, measuring OLT to ONU1; Measure the optical link state of OLT to ONU2 during the light signal of output L2 wavelength, the rest may be inferred, measures the optical link state of OLT to ONUn during the light signal of output Ln wavelength.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103560826A (en) * | 2013-11-21 | 2014-02-05 | 国家电网公司 | Method for testing multistage non-equipartition EPON optical fiber failures |
| 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 |
| CN104009794A (en) * | 2013-02-22 | 2014-08-27 | 中兴通讯股份有限公司 | Method and apparatus for detecting fault in optical fiber of passive optical network |
| WO2015154267A1 (en) * | 2014-04-10 | 2015-10-15 | 华为技术有限公司 | Optical time domain reflectometer implementation apparatus and system |
| WO2016131301A1 (en) * | 2015-07-27 | 2016-08-25 | 中兴通讯股份有限公司 | Intelligent optical distribution network apparatus and passive optical network system |
| 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 |
| 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 |
| 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 |
| 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 |
| CN113329277A (en) * | 2020-02-29 | 2021-08-31 | 华为技术有限公司 | Method and apparatus for optical communication |
| CN114499655A (en) * | 2021-11-23 | 2022-05-13 | 烽火通信科技股份有限公司 | Method and device for improving OTDR event identification |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090263123A1 (en) * | 2008-04-21 | 2009-10-22 | Oplink Communications, Inc. | Fiber network monitoring |
| CN102170309A (en) * | 2011-03-24 | 2011-08-31 | 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 |
| CN102177667A (en) * | 2008-10-09 | 2011-09-07 | 韩国科学技术院 | Fault localization method and fault localization device in a passive optical network, and passive optical network having the fault localization device |
-
2012
- 2012-08-24 CN CN201210303047.6A patent/CN102821330B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090263123A1 (en) * | 2008-04-21 | 2009-10-22 | Oplink Communications, Inc. | Fiber network monitoring |
| CN102177667A (en) * | 2008-10-09 | 2011-09-07 | 韩国科学技术院 | Fault localization method and fault localization device in a passive optical network, and passive optical network having the fault localization device |
| CN102170309A (en) * | 2011-03-24 | 2011-08-31 | 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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| 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 |
| CN104009794A (en) * | 2013-02-22 | 2014-08-27 | 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 |
| CN103560826A (en) * | 2013-11-21 | 2014-02-05 | 国家电网公司 | Method for testing multistage non-equipartition EPON optical fiber failures |
| US9998214B2 (en) | 2014-04-10 | 2018-06-12 | Huawei Technologies Co., Ltd | Optical time domain reflectometer implementation apparatus and system |
| CN105451840A (en) * | 2014-04-10 | 2016-03-30 | 华为技术有限公司 | Optical time domain reflectometer implementation apparatus and system |
| CN105451840B (en) * | 2014-04-10 | 2018-09-21 | 华为技术有限公司 | A kind of optical time domain reflectometer realization device and system |
| WO2015154267A1 (en) * | 2014-04-10 | 2015-10-15 | 华为技术有限公司 | Optical time domain reflectometer implementation apparatus and system |
| WO2016131301A1 (en) * | 2015-07-27 | 2016-08-25 | 中兴通讯股份有限公司 | Intelligent optical distribution network apparatus and passive optical network 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 |
| 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 |
| 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 |
| 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 |
| CN110034818B (en) * | 2018-12-17 | 2024-05-28 | 潘子俊 | Device and system for monitoring optical cable based on intelligent optical fiber distribution system |
| CN113329277A (en) * | 2020-02-29 | 2021-08-31 | 华为技术有限公司 | Method and apparatus for optical communication |
| CN114499655A (en) * | 2021-11-23 | 2022-05-13 | 烽火通信科技股份有限公司 | Method and device for improving OTDR event identification |
| 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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