CN104601228A - System and method for positioning PON network optical fiber link failures - Google Patents
System and method for positioning PON network optical fiber link failures Download PDFInfo
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Abstract
The invention discloses a system for positioning PON (Passive Optical Network) network optical fiber link failures and a method for positioning PON network optical fiber link failures; the system comprises a testing server, an ARD-OTDR device, an optical switch and a wavelength division multiplexer all which are arranged on the local end, wherein the testing server is connected with the ARD-OTDR device through an Ethernet network; the ARD-OTDR device is connected with the PON of one or multiple optical line terminals (OLT) sequentially through the optical switch and the wavelength division multiplexer so that testing lights are coupled to a main optical fiber; the wavelength division multiplexer is arranged on the OLT optical fiber on the local end, the optical fiber passes through the wavelength division multiplexer and is connected with an optical fiber distribution frame, and the optical fiber of the optical fiber distribution frame is connected with the ONU(Optical Network Unit) of the user terminal through a passive optical splitter; under the same passive optical splitter, and the difference value among the optical fiber lengths of the different users is no less than 1m. According to the method and the system, PON network optical fiber link failures can be positioned.
Description
Technical field
The present invention relates to PON optical fiber link fault location system and localization method.
Background technology
Passive optical-fiber network PON (Passive Optical Network) is a kind of point-to-multipoint configuration, and its classical group web frame as shown in Figure 1.PON forms by being positioned at the optical line terminal OLT (Optical Line Terminal) of local side, the optical network unit ONU (OpticalNetwork Unit) being positioned at user side and optical distribution network ODN (Optical Distribution Network), is single fiber bi-directional system.At down direction (OLT to ONU), the signal that OLT sends arrives each ONU by ODN; At up direction (ONU to OLT), each ONU at the appointed time transmits a signal to OLT.ODN is made up of Passive Optical Components such as optical cable/optical fiber and passive optical splitters POS (Passive OpticalSplitter), between OLT and ONU, provide optical channel.PON is convenient to the advantages such as maintenance with its high bandwidth, multi service access, saving optical fiber, becomes the main way of realization of FTTX.
The ODN of PON is made up of passive device, and passive optical splitters, optical connector and optical cable etc. are placed in outdoor for a long time, is easily subject to the impact of external environment and the fault that meets accident, causes communication disruption, instability or connection speed to decline.Possible fault has: the aging or fracture of optical cable, fusion point performance variation, optical connector damage, junction is stained or bad connection, terminal disappearance etc.The scale of disposing along with fiber to the home constantly expands, the increasing number of online optical cable, and PON branch light path is huge, and to fault location, maintenance arrangement, the Daily Round Check etc. of ODN, workload is very large.Under the environment of extensive, multi-user unit, how more effectively and rationally operation and maintenance optical-fiber network has become problem in the urgent need to address.
Optical time domain reflectometer OTDR (Optical Time Domain Reflectometer) is the important tool of fiber optic testing and fault location, has played important function over the backbone.LASER Light Source and detector set are combined by OTDR, its operation principle is: narrow light pulse is injected into fiber end face as detectable signal by OTDR, when light pulse is along spread fiber, the backscattering part of Rayleigh scattering will constantly return optical fiber incidence end everywhere, and when light signal runs into crackle or section, its back-reflection light (Fresnel reflection) also can return optical fiber incidence end, OTDR carries out repeatedly sample averaging and executive signal process to the backlight detected, except calculating total link length, outside total link loss and light return loss, intensity of reflected light and the time of advent of each event can also be calculated, measure the transmission characteristic of optical fiber quantitatively, length and position of failure point.
Traditional OTDR is hand-hold type instrument, is mainly used in the test carrying out point-to-point in backbone network and metropolitan area network, relies on manual type to investigate piecemeal and locating network fault, can not realize in real time on-line monitoring automatically.Along with the rise of FTTH network, PON technical scheme becomes main flow gradually, and the maximum feature of PON employs passive optical splitters POS on optical link, the introducing of POS in optical-fiber network, the particularly multi-stage cascade structure of POS, cause back-reflection light (fault causes) intensity of front end optical fiber exponentially the weakening of level, make traditional OTDR technology for detection less than back-reflection light, some OTDR even can not show fiber area after POS, are difficult to accurately locate in the Cable's Fault of local side to user side.
At present, the maintenance service of PON optical fiber link remains based on hand inspection, and operator, according to customer complaint, arranges technical staff to locate to check Fiber connection state to user, often need during detection to disconnect the Fiber connection at POS place, detect investigation piecemeal by hand-hold type OTDR instrument.PON still lacks effective on-line automatic fault location means at present, is difficult to realize on-line monitoring and automatic maintenance management.In recent years, the scale that fiber to the home is disposed constantly expanded, and quantity and the scale of PON significantly increase, operation and maintenance work is very heavy, and rely on the mode labor workload of manual field operation large, expend time in length, poor in timeliness, and be unfavorable for realizing modern management.
POS in PON is a passive optical splitters part, realizes function input optical signal being evenly distributed to each output channel.According to the difference of output quantity, the decay of light signal is also different.Usually, under the splitting ratio situation of 1 × 32, pad value is at about 16DB.If a light signal, from local side toward user side, is reflecting from user side, the loss that optical branching device is introduced, at 32DB, is making reflected signal and faint and become and can recognize hardly like this.
Existing PON monitoring system is due to the limitation of OTDR performance, need at user side installing optical fibres reflector (REFLECTOR), before fibre reflector is arranged on user terminal (ONU), it only reflects the test wavelength (1650nm) that OTDR launches, and leads directly to other service wavelength (the up 1550nm of descending 1390nm/).Fibre reflector can strengthen the volume reflection of test wavelength, and accomplishes good terminal resolution.But the introducing of fibre reflector not only can increase cost (the level installing engineering of device own), and can cause new fault point (fibre reflector itself); Meanwhile, in order to reach practical Detection results, require that the fiber lengths difference differentiating user reaches 5 meters, the optical fiber of different length is the key distinguishing user.Consider the feature of FTTH, the particularly high density residential structure of China, FTTH user is huge, the redundant length of each user 5 meters can cause the huge redundancy of optical cable, not only cost increases, and construction lays and all can cause new problem, accomplish that the difference of every user's fiber lengths 5 meters is very difficult, less resolution has huge realistic meaning.
In addition, for the operator of the PON such as telecommunications, electric power, in order to ensure communication, improving the availability factor of optical cable, making up the shortcoming safeguarding strength relative deficiency simultaneously, objectively require the maintenance service adopting centralization.Will grasp the operation conditions of cable network on the one hand in time, Timeliness coverage degradation trend, prevents trouble before it happens; On the other hand when there is disconnected fibre, can respond fast, accurately locating, shorten fault and last.Meanwhile, a large amount of with optical cable maintenance with manage the data informations such as relevant construction, cutover, all need the electronic means of utilization to carry out accounting logging, process and inquiry, statistics.
Summary of the invention
The object of the present invention is to provide a kind of PON optical fiber link fault location system and localization method, it can position PON optical fiber link fault.
For achieving the above object, the invention provides a kind of PON optical fiber link fault location system, comprise and be all arranged on local side: testing server, ARD-OTDR equipment, optical switch, wavelength division multiplexer;
Described testing server is connected with ARD-OTDR equipment by Ethernet;
Described ARD-OTDR equipment is connected the PON of one or more OLT successively with wavelength division multiplexer by optical switch, test light be coupled on trunk optical fiber;
Described wavelength division multiplexer is arranged on local side OLT optical cable, optical cable is by being connected to fibre distribution frame ODF (Optical Distribution Frame) after wavelength division multiplexer, the optical fiber of fibre distribution frame outlet is connected to user side ONU by passive optical splitters; Under same passive optical splitters, the fiber lengths difference of different user is not less than 1 meter;
Described testing server is built-in with:
For to look into ARD-OTDR equipment sending point or the cycle looks into the testing control module of test command;
The data reception module of test data is beamed back for receiving ARD-OTDR equipment;
For storing the database storage module of data;
For the data analysis module of analyzing and processing test data.
Preferably, described ARD-OTDR equipment is built-in with: laser occurs and control module, photoelectric switching circuit, ARD optical fiber link model and algorithm realizing circuit, DSP supercomputing circuit, FPGA control and synchronous circuit.
Preferably, described ARD-OTDR equipment is built-in with noise suppression circuit.
Preferably, described database storage module stores the basic data of tested network link, health account and test history data.
Preferably, described testing server is also built-in with: basic data administration module, measurement data administration module, statement management module, Shen accuse administration module, alarm management module, monitoring of tools module.
Preferably, described optical switch is MEMOS chip optical switch or electromechanical integration optical switch.
Preferably, described testing server is arranged on monitoring room, and described monitoring room is arranged in central office.
Preferably, described ARD-OTDR equipment, optical switch, wavelength division multiplexer are arranged on machine room.
Preferably, described ARD-OTDR is by Laser output port connecting fiber, and this Fiber connection is to the OTDR light source entrance of optical switch.
The present invention also provides PON optical fiber link Fault Locating Method, by above-mentioned PON optical fiber link fault location system, PON optical fiber link fault is positioned, comprise the steps: that the test request being surveyed mechanism triggering by customer complaint or timing example is sent to testing server, be sent to ARD-OTDR equipment afterwards by analysis, the optical fiber link of respective user is by the corresponding measuring head of optical switch access ARD-OTDR device port simultaneously, measuring head starts test, the test light pulse that ARD-OTDR equipment is launched and business light realize closing road by wavelength division multiplexer, trunk optical fiber down channel transmits, the back-reflection light pulse of test light returns ARD-OTDR equipment, ARD-OTDR equipment detects the light pulse tested and return, analytical calculation is carried out by its time of advent and pulse position, draw fault location and Optical Fiber Transmission performance evaluation, result of calculation is transferred to testing server, testing server carries out accident analysis and judgement in conjunction with original health account, conclusion loopback is given test originating end.
Compared with traditional OTDR technology, ARD-OTDR equipment adopts the reflect detection technology ARD (Advanced Reflection Detection) of enhancement mode.For small and weak reflected signal, existing light wave Detection Techniques are difficult to differentiate exactly and extract, and cause cannot judging and localizing faults.The core of ARD technology is its optical fiber link model and algorithm, the foundation of model derives from a large amount of PON characteristic test experiments, carry out by experiment simulating and contrasting, light-transfer characteristic is carried out frequency spectrum, extract the frequency domain character parameter in various situation, establish a whole set of effective optical link model and and for the algorithm of each model.Received signal strength will be tested and model compares at every turn, effectively fiber optic noise and useful small and weak reflected signal can be made a distinction, make test side faint reflected signal can successfully be detected.ARD algorithm model converts optical processing circuit to by DSP technology and electronic circuit hardware realizes.
Test light wavelength is 1650nm, different from PON service wavelength, transmitted on trunk optical fiber together with business light by WDM, but do not affect communication service, test light can penetrate passive optical splitters in PON, the omnidistance fault-location problem solving from local side (OLT) to user side (ONU).User side after passive optical splitters, the optical fiber of planning different length, distinguishes the different user of locating same passive optical splitters by user side optical fiber link length difference.
Described optical switch (OSW) is MEMOS chip optical switch or electromechanical integration optical switch; MEMOS chip optical switch cost is high, but good reliability, electromechanical integration optical switch cost is low, but needs the reliability and the actual effect that improve switch motion.The way of optical switch is determined according to the size of test network scale, has 36 ports, 48 ports and 50 ports etc.Be in the network of 64 at a splitting ratio, the optical switch of 36 ports can be 2304 users provides optical tests to access, and the optical switch of 50 ports can serve 3200 user sides.Optical switch can also form more jumbo optical switch by cascade system.
The present invention adopts ARD-OTDR technology, enhance the ability of system looks reverberation, overcome the shortcoming that conventional OTDR technique penetrates optical splitter scarce capacity, achieve the fault location penetrating optical splitter and realize between local side (OLT) to user side (ONU) in PON.
Adopt frequency domain optical fiber link algorithm model and noise suppression circuit, the optical splitter penetrating 1: 128 can be accomplished, thus make user's fiber lengths mark reduce to 1 meter, and user side does not need to install reflector, greatly saves construction cost.
Can realize full-automatic, centralizedly testing PON, diagnose, fault location and operational management, for PON network operator provides a kind of solution realizing optical-fiber network operation management automation, this system also can be applicable in other type fiber network.
All parts of system is all deployed in local side, adopts the on-line testing of band external wave progress row, does not disturb normal communications traffic.The function that can realize based on this system has:
Test according to customer complaint, automatically realize the fault location between OLT to ONU;
Start light path according to cycle set to detect, the working optical fibre quality automatically between test OLT to user ONU, the Fiber connection situation of each FTTH user of Real-Time Monitoring, guarantees business normal transmission;
According to test result analysis optical cable degradation trend, provide quality pre-alert;
Automatically according to alarm triggered relevant treatment flow process;
Carry out accident analysis statistics according to reference data, historical data, realize the function such as form, inquiry.
Accompanying drawing explanation
Fig. 1 is the classical group web frame for passive optical-fiber network PON;
Fig. 2 is schematic diagram of the present invention;
Fig. 3 is the schematic diagram of ARD-OTDR equipment.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is further described.Following examples only for technical scheme of the present invention is clearly described, and can not limit the scope of the invention with this.
The technical scheme that the present invention specifically implements is:
As shown in Figure 2 and Figure 3, the invention provides a kind of PON optical fiber link fault location system, comprise and be all arranged on local side: testing server, ARD-OTDR equipment, optical switch, wavelength division multiplexer (WDM);
Described testing server is connected with ARD-OTDR equipment by Ethernet;
Described ARD-OTDR equipment is connected the PON of one or more OLT successively with wavelength division multiplexer by optical switch, test light be coupled on trunk optical fiber;
Described wavelength division multiplexer is arranged on local side OLT optical cable, and optical cable is by being connected to fibre distribution frame ODF after wavelength division multiplexer, the optical fiber of fibre distribution frame outlet is connected to user side ONU by passive optical splitters; Under same passive optical splitters, the fiber lengths difference of different user is not less than 1 meter;
Described testing server is built-in with:
For to look into ARD-OTDR equipment sending point or the cycle looks into the testing control module of test command;
The data reception module of test data is beamed back for receiving ARD-OTDR equipment;
For storing the database storage module of data;
For the data analysis module of analyzing and processing test data.
Described ARD-OTDR equipment is built-in with: laser occurs and control module, photoelectric switching circuit, ARD optical fiber link model and algorithm realizing circuit, DSP supercomputing circuit, FPGA control and synchronous circuit.
Described ARD-OTDR equipment is built-in with noise suppression circuit.
Described database storage module stores the basic data of tested network link, health account and test history data.
Described testing server is also built-in with: basic data administration module, measurement data administration module, statement management module, Shen accuse administration module, alarm management module, monitoring of tools module.
Described optical switch is MEMOS chip optical switch or electromechanical integration optical switch.
Described testing server is arranged on monitoring room, and described monitoring room is arranged in central office.
Described ARD-OTDR equipment, optical switch, wavelength division multiplexer are arranged on machine room.
Described ARD-OTDR is by Laser output port connecting fiber, and this Fiber connection is to the OTDR light source entrance of optical switch.
The present invention also provides PON optical fiber link Fault Locating Method, by above-mentioned PON optical fiber link fault location system, PON optical fiber link fault is positioned, comprise the steps: that the test request being surveyed mechanism triggering by customer complaint or timing example is sent to testing server, be sent to ARD-OTDR equipment afterwards by analysis, the optical fiber link of respective user is by the corresponding measuring head of optical switch access ARD-OTDR device port simultaneously, measuring head starts test, the test light pulse that ARD-OTDR equipment is launched and business light realize closing road by wavelength division multiplexer, trunk optical fiber down channel transmits, the back-reflection light pulse of test light returns ARD-OTDR equipment by down channel, ARD-OTDR equipment detects the light pulse tested and return, analytical calculation is carried out by its time of advent and pulse position, draw fault location and Optical Fiber Transmission performance evaluation, result of calculation is transferred to testing server, testing server carries out accident analysis and judgement in conjunction with original health account, conclusion loopback is given test originating end.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1.PON network fiber link failure navigation system, is characterized in that, comprises and be all arranged on local side: testing server, ARD-OTDR equipment, optical switch, wavelength division multiplexer;
Described testing server is connected with ARD-OTDR equipment by Ethernet;
Described ARD-OTDR equipment is connected the PON of one or more OLT successively with wavelength division multiplexer by optical switch, test light be coupled on trunk optical fiber;
Described wavelength division multiplexer is arranged on local side OLT optical cable, and optical cable is by being connected to fibre distribution frame after wavelength division multiplexer, and the optical fiber of fibre distribution frame outlet is connected to user side ONU by passive optical splitters; Under same passive optical splitters, the fiber lengths difference of different user is not less than 1 meter;
Described testing server is built-in with:
For to look into ARD-OTDR equipment sending point or the cycle looks into the testing control module of test command;
The data reception module of test data is beamed back for receiving ARD-OTDR equipment;
For storing the database storage module of data;
For the data analysis module of analyzing and processing test data.
2. PON optical fiber link fault location system according to claim 1, it is characterized in that, described ARD-OTDR equipment is built-in with: laser occurs and control module, photoelectric switching circuit, ARD optical fiber link model and algorithm realizing circuit, DSP supercomputing circuit, FPGA control and synchronous circuit.
3. PON optical fiber link fault location system according to claim 2, is characterized in that, described ARD-OTDR equipment is built-in with noise suppression circuit.
4. the PON optical fiber link fault location system according to claim 1,2 or 3, is characterized in that, described database storage module stores the basic data of tested network link, health account and test history data.
5. PON optical fiber link fault location system according to claim 4, it is characterized in that, described testing server is also built-in with: basic data administration module, measurement data administration module, statement management module, Shen accuse administration module, alarm management module, monitoring of tools module.
6. PON optical fiber link fault location system according to claim 5, is characterized in that, described optical switch is MEMOS chip optical switch or electromechanical integration optical switch.
7. PON optical fiber link fault location system according to claim 6, is characterized in that, described testing server is arranged on monitoring room, and described monitoring room is arranged in central office.
8. PON optical fiber link fault location system according to claim 7, is characterized in that, described ARD-OTDR equipment, optical switch, wavelength division multiplexer are arranged on machine room.
9. PON optical fiber link fault location system according to claim 8, is characterized in that, described ARD-OTDR is by Laser output port connecting fiber, and this Fiber connection is to the OTDR light source entrance of optical switch.
10.PON network fiber periodic line fault location method, it is characterized in that, by PON optical fiber link fault location system according to any one of claim 1 to 9, PON optical fiber link fault is positioned, comprise the steps: that the test request being surveyed mechanism triggering by customer complaint or timing example is sent to testing server, be sent to ARD-OTDR equipment afterwards by analysis, the optical fiber link of respective user is by the corresponding measuring head of optical switch access ARD-OTDR device port simultaneously, measuring head starts test, the test light pulse that ARD-OTDR equipment is launched and business light realize closing road by wavelength division multiplexer, trunk optical fiber down channel transmits, the back-reflection light pulse of test light returns ARD-OTDR equipment, ARD-OTDR equipment detects the light pulse tested and return, analytical calculation is carried out by its time of advent and pulse position, draw fault location and Optical Fiber Transmission performance evaluation, result of calculation is transferred to testing server, testing server carries out accident analysis and judgement in conjunction with original health account, conclusion loopback is given test originating end.
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| CN109617605A (en) * | 2018-11-27 | 2019-04-12 | 中国船舶重工集团公司第七〇九研究所 | Light path selector, optical fiber telecommunications system and method |
| CN112567647A (en) * | 2018-11-30 | 2021-03-26 | 华为技术有限公司 | PON fault positioning method and device |
| CN112567647B (en) * | 2018-11-30 | 2022-07-22 | 华为技术有限公司 | PON fault positioning method and device |
| CN111082520A (en) * | 2019-11-28 | 2020-04-28 | 广东电网有限责任公司汕头供电局 | Method, equipment and storage medium for operation control of optical distribution network |
| CN115119084A (en) * | 2021-03-22 | 2022-09-27 | 中国联合网络通信集团有限公司 | Management method, device, equipment and storage medium for optical cable cutting alarm |
| CN115119084B (en) * | 2021-03-22 | 2024-04-09 | 中国联合网络通信集团有限公司 | Management method, device, equipment and storage medium for optical cable cutting alarm |
| WO2023071326A1 (en) * | 2021-10-26 | 2023-05-04 | 华为技术有限公司 | Fault locating method, device and optical network system |
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