CN101964682A - Distributed optical fiber fault locating method and system - Google Patents
Distributed optical fiber fault locating method and system Download PDFInfo
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- CN101964682A CN101964682A CN2010105181378A CN201010518137A CN101964682A CN 101964682 A CN101964682 A CN 101964682A CN 2010105181378 A CN2010105181378 A CN 2010105181378A CN 201010518137 A CN201010518137 A CN 201010518137A CN 101964682 A CN101964682 A CN 101964682A
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Abstract
The invention provides distributed optical fiber fault locating method and system. The method comprises the following steps of: coupling signal light and monitoring light to a light path, wherein the wavelength of the signal light is different from that of the monitoring light; transmitting the signal light and the monitoring light to a plurality of optical network units through branch lines; arranging a plurality of reflectors in a distributed mode to reflect part of the monitoring light in the regional intersections of all the branch lines; receiving the light reflecting signals of the reflectors, and acquiring a time domain monitoring image of the light reflecting signals; and comparing the time domain monitoring image with a project acceptance image, and determining the region with a fault. The invention can realize low-cost fault location in specific position of optical fiber branches.
Description
Technical field
The present invention relates to technical field of optical fiber communication, relate in particular to a kind of distribution type fiber-optic Fault Locating Method and system.
Background technology
At present EPON (PON, Passive Optical Network) in, fiber resource often is to be occupied by different operators, the fault fix duty is Access Network photosphere management (OLS, Optical Layer Supervisor) important component part, if can not effectively find out problem light path position, will inevitably cause a large amount of time and economic loss.In a single day therefore fiber failure occurs, need carry out fix duty timely.Though utilize common optical time domain reflectometer (OTDR, Optical Time Domain Reflectormeter) can accurately locate single fault in the point-to-point topology with optical fiber, and for the structure of this point of PON to multiple spot, fault location is more complicated then, the solution of industry has a lot of deficiencies, mainly is the abort situation that can't distinguish optical branching device each branch road afterwards.
At this problem, developed high-resolution optical time domain reflectometer (H-OTDR, High resolution OTDR) and tunable light source optical time domain reflectometer (TLS-OTDR, Tunable Laser Source OTDR) technology, wherein the H-OTDR technology is by being provided with Fiber Bragg Grating FBG (FBG in every branch, Fiber Bragg Grating) comes to determine the branch that breaks down according to monitoring light reflection case, but can't carry out the fault fix duty to the line resource of different operators and in a branch, certain node be carried out the fault fix duty, and use the cost of FBG very high.The TLS-OTDR technology uses OTDR and FBG to realize the fault fix duty equally, different with the H-OTDR technology is, use the reflection wavelength difference of the FBG of TLS and every branch, the position of FBG without limits, can be differentiated with the reflection wavelength that guarantees two branches, so FBG must customize, this just causes cost higher than H-OTDR technology, for comparatively complicated situation such as a plurality of operators line resource is arranged in the circuit, also effective fix duty.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of distribution type fiber-optic Fault Locating Method and system, can overcome the shortcoming that can't carry out the fault fix duty to the line resource or the heterogeneous networks node of different operators in the prior art.
For achieving the above object, the embodiment of the invention provides a kind of distribution type fiber-optic Fault Locating Method, comprising: flashlight and monitoring are coupled light in the light path, and described flashlight is different with the monitoring optical wavelength; Described flashlight and monitoring light are passed along separate routes to a plurality of optical network units; At a plurality of reflectors reflecting part of the distributed placement of regional intersection of each branched line monitoring light; Receive the light reflected signal of described reflector, obtain the time domain surveillance map picture of described smooth reflected signal; Contrast described time domain surveillance map picture and acceptance of work image, determine the zone of breaking down.
The embodiment of the invention provides a kind of distribution type fiber-optic fault location system, comprising: optical line terminal is used to the light that transmits; Optical time domain reflectometer is used for launch monitor light and receives the time domain surveillance map picture that the light reflected signal forms described smooth reflected signal, and described monitoring light is different with described signal light wavelength; Optical fibre wavelength division multiplexer is used for described flashlight and monitoring are coupled light to light path; Optical branching device is used for described flashlight and monitoring light are passed along separate routes to a plurality of optical network units; A plurality of first reflectors, light is monitored in the regional intersection and the reflecting part that are positioned at each branched line; Comparison means is used to contrast described time domain surveillance map picture and acceptance of work image, determines the zone of breaking down.
The embodiment of the invention is passed through to obtain the time domain surveillance map picture of described smooth reflected signal at a plurality of reflectors reflecting part of the distributed placement of regional intersection of each branched line monitoring light, realizes the low-cost fault fix duty of fiber optic tap ad-hoc location.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, does not constitute limitation of the invention.In the accompanying drawings:
Fig. 1 is the flow chart according to the distribution type fiber-optic Fault Locating Method of the embodiment of the invention one.
Fig. 2 is the structural representation according to the distribution type fiber-optic fault location system of the embodiment of the invention two.
Fig. 3 is for being provided with the structural representation of position according to the reflector of the embodiment of the invention two.
Fig. 4 is the schematic diagram of the time domain surveillance map picture according to the present invention.
Fig. 5 is the schematic diagram of the acceptance of work image according to the present invention.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention is clearer,, the embodiment of the invention is described in further details below in conjunction with embodiment and accompanying drawing.At this, illustrative examples of the present invention and explanation thereof are used to explain the present invention, but not as a limitation of the invention.
Embodiment one
Present embodiment provides a kind of distribution type fiber-optic Fault Locating Method.As shown in Figure 1, this method comprises:
Step 101: flashlight and monitoring are coupled light in the light path, and described flashlight is different with the monitoring optical wavelength;
This step is carried out by optical fibre wavelength division multiplexer (WDM), optical line terminal (OLT, Optical Line Terminal) and optical time domain reflectometer (OTDR, Optical Time Domain Reflectormeter), and wherein the OLT outgoing is a flashlight, and wavelength is λ
1, the OTDR outgoing is monitoring light, wavelength is λ
2WDM couples light to the flashlight of OLT outgoing and the monitoring of OTDR outgoing in one road optical fiber.
Step 102: described flashlight and monitoring light are passed along separate routes to a plurality of optical network units;
This step is carried out by optical branching device (optical splitter), and for example the optical branching device by 1 * N will be coupled to the flashlight in one road optical fiber and monitor the light biography to N optical network unit (ONU, Optical Network Unit).
Step 103: at a plurality of reflectors reflecting part of the distributed placement of regional intersection of each branched line monitoring light;
This step is carried out by reflector, is arranged on the regional intersection of each branched line, for example the connected node in operator's zone intersection and/or the optical-fiber network.
As shown in Figure 2, be shared as example by A, B, C, D by 4 operators with circuit respectively from the local side to the user side, place reflector R1 at two operator's circuit intersections, its optical characteristics is: for λ
1Be anti-reflection film, for λ
2Be the partial reflection film, i.e. flashlight λ
1By almost there not being energy loss behind the reflector 1, and monitoring light λ
2By being divided into two-beam behind the reflector 1, a branch of light continues to propagate forward by reflector, and another Shu Guang returns along former road, is received by OTDR through behind the WDM.Further, in the end the intersection of two C of operator and D is provided with reflector R2, and its optical characteristics is: for λ
1Be anti-reflection film, for λ
2Be the film that is all-trans, i.e. flashlight λ
1By almost there not being energy loss behind the reflector 2, finally arrive ONU, and monitoring light λ
2By all being reflected behind the reflector 2, being received by OTDR through behind the WDM, thereby avoid λ
2Enter ONU inside, influence ONU work.
As shown in Figure 3, be example there to be different connected nodes in the optical-fiber network.The OLT outgoing is a flashlight, and wavelength is λ
1, the outgoing of OTDR is monitoring light, wavelength is λ
2, the light of two wavelength is coupled in one road optical fiber by WDM.Light is through the optical branching device of a 1 * M, the connection situation difference of every branch, and article one branches into FTTB, is divided into N branch again at the basement in the building optical branching device by 1 * N, is connected to ONU, and second branches into FTTH, directly connects user's ONU.Also at the fiber optic tap of 1 * N optical branching device front end, promptly light path branch is provided with reflector R1 with the connected node place of branch again, with the position of determining to break down in the optical-fiber network comprehensively.
Step 104: receive the light reflected signal of described reflector, obtain the time domain surveillance map picture of described smooth reflected signal;
This step is carried out by OTDR, forms time domain surveillance map picture behind the monitoring light of OTDR reception reflected back.Four operators with Fig. 2 are example, when system's operate as normal, the OTDR curve of output as shown in Figure 4, article one, monitoring light is through the reflector in the middle of A of operator and the B of the operator circuit in the branch, and the pulse of generation is designated as 1A, through the reflector in the middle of B of operator and the C of the operator circuit, the pulse that produces is designated as 1B, monitoring light is through the reflector in the middle of A of operator and the B of the operator circuit in the second branch, and the pulse of generation is designated as 2A, and other pulse names by that analogy.Good when track laying, when finishing the acceptance of work, circuit is in working properly, with this moment surveillance map look like to save as acceptance of work figure.
Step 105: contrast described time domain surveillance map picture and acceptance of work image, determine the zone of breaking down.
This step is by comparison means or manually finish, and still four operators with Fig. 2 are example, then can determine location of fault in the branch according to the surveillance map picture with respect to acceptance of work image deletion pulse.As comparison diagram 5 (time domain surveillance map) and Fig. 4 (acceptance of work figure), wherein dotted line has shown the pulse of surveillance map picture with respect to acceptance of work image disappearance, is easy to determine that fault has appearred in the circuit of B operator in first branch.
Present embodiment obtains the time domain surveillance map picture of described smooth reflected signal by at the regional intersection reflecting part of each branched line monitoring light, realizes the low-cost fault fix duty of fiber optic tap ad-hoc location.
Embodiment two
Present embodiment provides a kind of distribution type fiber-optic fault location system.As shown in Figure 2, this system comprises:
Optical time domain reflectometer 220 is used for launch monitor light and receives the time domain surveillance map picture that the light reflected signal forms described smooth reflected signal, and described monitoring light is different with described signal light wavelength;
Optical fibre wavelength division multiplexer 230 is used for described flashlight and monitoring are coupled light to light path;
Optical branching device 240 is used for described flashlight and monitoring light are passed along separate routes to a plurality of optical network units;
A plurality of first reflector R1 are positioned at the regional intersection of each branched line and reflecting part monitoring light only;
Comparison means 250 is used to contrast described time domain surveillance map picture and acceptance of work image, determines the zone of breaking down.
As shown in Figure 2, be shared as example by A, B, C, D by 4 operators with circuit respectively from the local side to the user side, place reflector R1 at two operator's circuit intersections, its optical characteristics is: for λ
1Be anti-reflection film, for λ
2Be the partial reflection film, i.e. flashlight λ
1By almost there not being energy loss behind the reflector 1, and monitoring light λ
2By being divided into two-beam behind the reflector 1, a branch of light continues to propagate forward by reflector, and another Shu Guang returns along former road, is received by OTDR through behind the WDM.Further, in the end the intersection of two C of operator and D is provided with reflector R2, and its optical characteristics is: for λ
1Be anti-reflection film, for λ
2Be the film that is all-trans, i.e. flashlight λ
1By almost there not being energy loss behind the reflector 2, finally arrive ONU, and monitoring light λ
2By all being reflected behind the reflector 2, being received by OTDR through behind the WDM, thereby avoid λ
2Enter ONU inside, influence ONU work.
As shown in Figure 3, be example there to be different connected nodes in the optical-fiber network.The OLT outgoing is a flashlight, and wavelength is λ
1, the outgoing of OTDR is monitoring light, wavelength is λ
2, the light of two wavelength is coupled in one road optical fiber by WDM.Light is through the optical branching device of a 1 * M, the connection situation difference of every branch, and article one branches into FTTB, is divided into N branch again at the basement in the building optical branching device by 1 * N, is connected to ONU, and second branches into FTTH, directly connects user's ONU.Also at the fiber optic tap of 1 * N optical branching device front end, promptly light path branch is provided with reflector R1 with the connected node place of branch again, with the position of determining to break down in the optical-fiber network comprehensively.
OTDR 220 forms time domain surveillance map picture after receiving the monitoring light of reflection.Four operators with Fig. 2 are example, when system's operate as normal, OTDR 220 curves of output as shown in Figure 4, article one, monitoring light is through the reflector in the middle of A of operator and the B of the operator circuit in the branch, and the pulse of generation is designated as 1A, through the reflector in the middle of B of operator and the C of the operator circuit, the pulse that produces is designated as 1B, monitoring light is through the reflector in the middle of A of operator and the B of the operator circuit in the second branch, and the pulse of generation is designated as 2A, and other pulse names by that analogy.Good when track laying, when finishing the acceptance of work, circuit is in working properly, with this moment surveillance map look like to save as acceptance of work figure.Comparison means 250 relatively the surveillance map pictures with respect to acceptance of work image deletion pulse whether.Still four operators with Fig. 2 are example, then can determine location of fault in the branch according to the surveillance map picture with respect to acceptance of work image deletion pulse.As comparison diagram 5 (time domain surveillance map) and Fig. 4 (acceptance of work figure), wherein dotted line has shown the pulse of surveillance map picture with respect to acceptance of work image disappearance, is easy to determine that fault has appearred in the circuit of B operator in first branch.
Present embodiment obtains the time domain surveillance map picture of described smooth reflected signal by at the regional intersection reflecting part of each branched line monitoring light, realizes the low-cost fault fix duty of fiber optic tap ad-hoc location.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiments of the invention; and be not intended to limit the scope of the invention; within the spirit and principles in the present invention all, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. a distribution type fiber-optic Fault Locating Method is characterized in that, this method comprises:
Flashlight and monitoring are coupled light in the light path, and described flashlight is different with the monitoring light wavelength;
Described flashlight and monitoring light are passed along separate routes to a plurality of optical network units;
At a plurality of reflectors reflecting part of the distributed placement of regional intersection of each branched line monitoring light;
Receive the light reflected signal of described reflector, obtain the time domain surveillance map picture of described smooth reflected signal;
Contrast described time domain surveillance map picture and acceptance of work image, determine the zone of breaking down.
2. method according to claim 1 is characterized in that: at the whole monitoring light of latter two regional intersection reflection of each branched line.
3. according to claim 2 or 3 described methods, it is characterized in that: at the anti-reflection described flashlight of the regional intersection of each branched line.
4. method according to claim 1 is characterized in that: determine the zone of breaking down with respect to the pulse of acceptance of work image disappearance according to the surveillance map picture.
5. method according to claim 1 is characterized in that: described regional intersection is the node in operator's zone intersection and/or the optical-fiber network.
6. a distribution type fiber-optic fault location system is characterized in that, this system comprises:
Optical line terminal is used to the light that transmits;
Optical time domain reflectometer is used for launch monitor light, and receives the time domain surveillance map picture that the light reflected signal forms described smooth reflected signal, and described monitoring light is different with described signal light wavelength;
Optical fibre wavelength division multiplexer is used for described flashlight and monitoring are coupled light to light path;
Optical branching device is used for described flashlight and monitoring light are passed along separate routes to a plurality of optical network units;
A plurality of first reflectors, light is monitored in the regional intersection and the reflecting part that are positioned at each branched line;
Comparison means is used to contrast described time domain surveillance map picture and acceptance of work image, determines the zone of breaking down.
7. system according to claim 6 is characterized in that, also comprises: a plurality of second reflectors are positioned at all monitoring light of latter two the regional intersection of each branched line and reflection.
8. according to claim 6 or 7 described systems, it is characterized in that: the anti-reflection described flashlight of described first reflector and second reflector.
9. system according to claim 8 is characterized in that: described first reflector and second reflector insert the diaphragm mode by connector plated film or adapter and make.
10. system according to claim 6 is characterized in that: described comparison means is determined the zone of breaking down with respect to the pulse of acceptance of work image disappearance according to the surveillance map picture.
11. system according to claim 6 is characterized in that: described regional intersection is the node in operator's zone intersection and/or the optical-fiber network.
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| CN104021645A (en) * | 2014-05-17 | 2014-09-03 | 桂林聚联科技有限公司 | Road guardrail bump alarm method based on distributed cable sensing and road guardrail bump alarm device based on distributed cable sensing |
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| CN105007116A (en) * | 2014-04-21 | 2015-10-28 | 江苏艾思特信息科技有限公司 | Rapid fiber fault monitoring system |
| CN105530046A (en) * | 2014-09-30 | 2016-04-27 | 中国电信股份有限公司 | Method and system for realizing automatic tests on light power and branch attenuation faults |
| CN105577458A (en) * | 2016-03-10 | 2016-05-11 | 武汉邮电科学研究院 | Device and method for positioning branch fault in passive optical access network |
| WO2016208169A1 (en) * | 2015-06-25 | 2016-12-29 | 日本電気株式会社 | Device and specification method |
| WO2017206371A1 (en) * | 2016-05-31 | 2017-12-07 | 中兴通讯股份有限公司 | Optical fiber network fault detection method, device, and system |
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| CN109004974A (en) * | 2018-08-22 | 2018-12-14 | 惠安科培工业设计有限公司 | Fiber optic network fault detection means |
| CN110048771A (en) * | 2019-05-15 | 2019-07-23 | 任永辉 | A kind of power communication laser scanning device |
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| CN102420652B (en) * | 2011-10-25 | 2014-05-21 | 上海电信工程有限公司 | Optical path cutover method |
| CN102420652A (en) * | 2011-10-25 | 2012-04-18 | 上海电信工程有限公司 | Optical path cutover method |
| CN103023563B (en) * | 2012-11-02 | 2016-04-06 | 江苏威尔信通光电技术有限公司 | A kind of optical survey method |
| CN103023563A (en) * | 2012-11-02 | 2013-04-03 | 江苏威尔信通光电技术有限公司 | Optical cable monitoring method |
| CN104125010B (en) * | 2013-04-25 | 2016-12-28 | 中国移动通信集团河北有限公司 | A kind of method and device of Cable's Fault location |
| CN104125010A (en) * | 2013-04-25 | 2014-10-29 | 中国移动通信集团河北有限公司 | Optical cable fault location method and device thereof |
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| CN105007116B (en) * | 2014-04-21 | 2018-11-30 | 江苏艾思特信息科技有限公司 | Fast fibre failure monitoring system |
| CN105007116A (en) * | 2014-04-21 | 2015-10-28 | 江苏艾思特信息科技有限公司 | Rapid fiber fault monitoring system |
| CN104021645A (en) * | 2014-05-17 | 2014-09-03 | 桂林聚联科技有限公司 | Road guardrail bump alarm method based on distributed cable sensing and road guardrail bump alarm device based on distributed cable sensing |
| CN104021645B (en) * | 2014-05-17 | 2017-02-08 | 桂林聚联科技有限公司 | Road guardrail bump alarm method based on distributed cable sensing |
| CN105530046A (en) * | 2014-09-30 | 2016-04-27 | 中国电信股份有限公司 | Method and system for realizing automatic tests on light power and branch attenuation faults |
| CN105530046B (en) * | 2014-09-30 | 2018-06-12 | 中国电信股份有限公司 | Realize the method and system that luminous power and branch off attenuation failure are tested automatically |
| WO2016208169A1 (en) * | 2015-06-25 | 2016-12-29 | 日本電気株式会社 | Device and specification method |
| JPWO2016208169A1 (en) * | 2015-06-25 | 2018-04-12 | 日本電気株式会社 | Device, identification method |
| US10215663B2 (en) | 2015-06-25 | 2019-02-26 | Nec Corporation | Device and specification method |
| CN105577458B (en) * | 2016-03-10 | 2018-10-09 | 武汉邮电科学研究院 | The device and method that branch trouble positions in a kind of passive optical access network network |
| CN105577458A (en) * | 2016-03-10 | 2016-05-11 | 武汉邮电科学研究院 | Device and method for positioning branch fault in passive optical access network |
| WO2017206371A1 (en) * | 2016-05-31 | 2017-12-07 | 中兴通讯股份有限公司 | Optical fiber network fault detection method, device, and system |
| CN108683452A (en) * | 2018-08-22 | 2018-10-19 | 惠安科培工业设计有限公司 | Fiber optic network fault detection system |
| CN109004974A (en) * | 2018-08-22 | 2018-12-14 | 惠安科培工业设计有限公司 | Fiber optic network fault detection means |
| CN110048771A (en) * | 2019-05-15 | 2019-07-23 | 任永辉 | A kind of power communication laser scanning device |
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