CN101630972B - Optical fiber line intelligent detection system and optical fiber line intelligent detection method for wavelength division multiplex (WDM) network - Google Patents
Optical fiber line intelligent detection system and optical fiber line intelligent detection method for wavelength division multiplex (WDM) network Download PDFInfo
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Abstract
The invention discloses an optical fiber line intelligent detection system and an optical fiber line intelligent detection method for a wavelength division multiplex (WDM) network. The detection system comprises a plurality of stations and a control unit, wherein the stations are connected with the control unit by an optical fiber; each station comprises an optical amplification unit, an optical monitoring unit and an optical channel performance detecting unit, at least one station is provided with an optical time domain reflectometry (OTDR) unit, and the input/output port of the test light of the OTDR unit is respectively connected to an optical multiplexer and an optical demultiplexer of the input end and the output end of the station by an optical multiplexing switch; and the control unit receives the alarm or performance abnormity information of the units and transmits an optical fiber line scanning signal to a relevant OTDR unit scanning optical fiber link. After an optical fiber line generates failure, the control automatically starts the relevant OTDR unit to scan the corresponding line and automatically marks a failure point in a global information system (GIS) map, thereby realizing the rapid positioning of the failure and shortening the business interruption time.
Description
Technical field
The present invention relates to WDM fiber optic network field, particularly relate to a kind of fibre circuit intelligent checking system and detection method of the WDM of being used for network.
Background technology
For the satisfied communication service that increases fast, such as: video transmission, fiber optic network is used widely, and in fiber optic network, the application of wavelength division multiplexing (WDM) is the most general.WDM is exactly the light carrier with a series of carrying informations, in the optical frequency territory, the wavelength of certain intervals is lumped together along the simple optical fiber transmission communication mode that with certain method the light carrier of each different wave length is separated again at receiving terminal.It has the following advantages:
(1) high power capacity: the speed of each wavelength can reach 40Gbit/s, and single fiber can transmit 160 above wavelength;
(2) be prone to dilatation:, adopt WDM to carry out dilatation and can do bigger change to original system for the few optical cable of core number that lays in early days.
(3) transparency: transmission wavelength and agreement and speed are irrelevant.Can on optical channel, transmit any agreement (FC/Gigabit Ethernet for example, ATM, SONET, etc.), also can transmit the signal of various bit rates (for example 2.5Gbit/s, 10Gbit/s and 40Gbit/s).
In order to guarantee the job stability of Networks of Fiber Communications; The faulty line location seems particularly important fast; Particularly become increasingly complex along with what the fiber optic network structure became; Have a large amount of fibre circuits to insert on the network node, when wherein certain bar circuit broke down, the location of faulty line was just difficult more.At present; What extensively adopted the location of fiber failure circuit is OTDR (Optical Time Domain Reflectometer) optical time domain reflectometer; It is the backscattering that produced of a kind of Rayleigh scattering and Fresnel reflection when utilizing light in optical fiber, to transmit and the optoelectronic integration instrument of the precision processed; Be 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.
Yet; Even use the OTDR instrument; After optical-fiber line fault occurring, the technical staff also will be at first according to navigating to corresponding fibre circuit behind the network configuration map analysis a large number of services fault point, and the optical fiber interface with network node is connected on the OTDR equipment again; After test, find the distance of fault point and network node, at last could the fault location point according to optical cable laying figure.In addition, mostly use the 1550nm wavelength light as test light in the OTDR instrument, its advantage is that decay is little, can find range from longer relatively, but decay characteristics that but can not online detection fiber circuit.
Thus it is clear that, after Networks of Fiber Communications generation line fault, need at first phase-split network allocation plan of engineers and technicians at present; Find out the tie point of fault fibre circuit, manual operation OTDR Meter Test then measures the position of fault point on engineering drawing; Because fiber optic network complex structure; Have a large amount of fibre circuits to insert on the network node, so the line fault eliminating time is long, causes service outage duration longer.
Summary of the invention
Technical problem to be solved by this invention is that solution fault fibre circuit location is slow, troubleshooting time is long, causes the long problem of service outage duration.
In order to solve the problems of the technologies described above; The technical scheme that the present invention adopted provides a kind of intelligent checking system of the WDM of being used for optical fiber ring network circuit; Comprise a plurality of websites that are connected in the fibre circuit; The input of said website, output are respectively equipped with the sending and receiving channel join-splitting device, be respectively applied for merging, separate this website input, output light signal, website comprises:
Optical Amplifier Unit is used to amplify the light signal on the optical transmission line, loses alarm when the 1550nm window light that receives occurs sending input light when input light is lost;
The light monitoring unit is used to send and receive the monitor optical of 1510nm wavelength, loses alarm when the 1510nm monitor optical that receives occurs sending monitor optical when input light is lost;
The optical channel performance detecting unit, the luminous power of all light signals on the poll scan light transmission line is sent the property abnormality alarm when all channel signal luminous powers all occur descending and surpass 5dB;
Also comprise a control unit; At least one website is provided with the OTDR unit; Said OTDR unit comprises an OTDR module and a multichannel optical switch, and the test light input/output end port of OTDR unit is connected respectively on the channel join-splitting device of this website input and output side through the multichannel optical switch; Said control unit receives above-mentioned input light and loses alarm, monitor optical and lose alarm and the concurrent out optical fiber line of property abnormality alarm signal road sweep signal to relevant OTDR unit.
The present invention also provides a kind of intelligent detecting method of the WDM of being used for optical fiber ring network circuit, may further comprise the steps:
S1, control unit are carried out scan command, and scanning can trigger the alarm or the property abnormality information of the correlation unit of OTDR, and said trigger condition comprises one of following several kinds of situation or its combination:
Relevant alarm appears in S11, optical transmission aspect, and the Optical Amplifier Unit that the receiving terminal that comprises arbitrary website is used to receive the 1550nm window light occurs importing light simultaneously with the light monitoring unit that is used to receive the 1510nm monitor optical and loses alarm;
S12, the master channel monitor optical is lost or the alternate channel monitor optical is lost alarm in the network of having used route protection;
S13, optical channel performance detecting unit find that when poll scans descending and surpassing 5dB all appears in all the channel signal luminous powers in the fibre circuit;
After S2, control unit collect above-mentioned alarm and property abnormality information; Through topological diagram unusual fibre circuit is navigated to and to send the alarm OTDR unit relevant with the website of property abnormality information; Switch the optical switch in said this OTDR unit, assign the order of scanning fibre circuit;
S3, OTDR unit report scanning result through its PORT COM to control unit; Control unit is drawn out the decay characteristics curve of corresponding fibre circuit after according to the comparison of the historical record of this result and pad value and optical fiber termination point and decay abnormity point is located, then at the enterprising line identifier of GIS map.
The present invention, after fibre circuit broke down, control unit started relevant OTDR unit automatically respective lines is scanned, and automatically the fault point is marked at the GIS map, realizes the quick location of fault, shortens service outage duration.
Description of drawings
Fig. 1 is a kind of embodiment sketch map that is used for the circuit intelligent checking system of WDM optical fiber network system;
Fig. 2 is the fine sketch map of the company of OTDR of the present invention unit in the A website;
Fig. 3 is used for the circuit intelligent detecting method flow chart of WDM optical fiber network system for the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is made detailed explanation.
Fig. 1 is the WDM optical fiber network system sketch map with two looped networks compositions of a common website, and Fig. 2 is the fine sketch map of the company of OTDR of the present invention unit in the A website.Like Fig. 1, shown in Figure 2; Said looped network comprises a plurality of websites that connected by optical fiber; Said website comprise the Optical Amplifier Unit that is used to amplify light signal on the optical transmission line and the monitor optical that is used to send, receive the 1510nm wavelength the light monitoring unit, be used for the optical channel performance detecting unit and the control unit of each channel power value on the online light travels circuit; The input of website, output are respectively equipped with the sending and receiving channel join-splitting device; Be respectively applied for merging, separate the light signal of the input of this website, output; Optical Amplifier Unit sends input light and loses alarm when the 1550nm window light that receives input light occurs and loses, and loses the time monitoring unit and sends monitor optical and lose alarm when input light appears in the 1510nm monitor optical that receives, and the optical channel performance detecting unit sends the property abnormality alarm when all channel signal luminous powers all occur descending and surpass 5dB; At least one website is provided with the OTDR unit; The OTDR unit comprises an OTDR module and one 's 1 * 8 optical switch, and the test light input/output end port of OTDR unit is connected respectively on the channel join-splitting device of this website input and output side through the multichannel optical switch, and OAD is the single channel optical add/drop multiplexer among the figure; Control unit scanning can trigger the alarm or the property abnormality information of the correlation unit of OTDR; And according to above-mentioned alarm or the relevant OTDR unit scan fibre circuit of property abnormality information startup; Fault location; That is to say that control unit receives input light that Optical Amplifier Unit sends and loses after monitor optical that alarm, light monitoring unit send loses the property abnormality alarm signal that alarm or optical channel performance detecting unit send, and sends scanning optical fiber line signal to the OTDR unit; Start the OTDR unit, start working.In the above-mentioned loop network system, website C is the joint of two looped networks, promptly common website, and this common website can be dispatched two business between looped network, comprises that light intersects and the electricity intersection.Active and standby two circuits are arranged between website A and the website B.OTDR unit with 8 optical channel ports respectively is set on website A, C and F, and all Line Attenuation characteristics of such two looped networks all can be obtained respectively by these 3 OTDR unit.
Further referring to the OTDR unit shown in Figure 2 and the connection layout of fibre circuit, shown in Fig. 2 is the OTDR unit of A website and the sketch map that is connected of fibre circuit again, and other websites and website category-A are seemingly.The OTDR unit comprises an OTDR module and one 's 1 * 8 optical switch; The test light of OTDR module (1625nm wavelength) output port is connected on the sending and receiving channel join-splitting device of this website input; This sending and receiving channel join-splitting device is with the 1625nm wavelength measurement light and the photosynthetic ripple of 1550nm window of OTDR module; The optical loss test port of OTDR module is connected on the sending and receiving channel join-splitting device of this website output through the multichannel optical switch respectively, and this sending and receiving channel join-splitting device is used for the 1625nm test light of OTDR and 1550 window service light (comprising 1510nm light monitor optical) are isolated fibre circuit.The sending and receiving optical fiber on the left side is connected to the D website respectively among Fig. 2, and the optical fiber on the right is connected respectively to the B website.The business of A, two websites of B has adopted the route protection of four-fiber bidirectional.When system normally moves, start the OTDR unit and each fibre circuit is scanned and notes the attenuation characteristic (comprising the extension wire between A, B website) under the normal condition successively through the switches light switch.
The quantity that is provided with of OTDR unit is set according to actual needs, and principle is to guarantee to cover whole network.
Specify the positioning principle of faulty line below in conjunction with Fig. 1.The C website has 8 circuits as the joint one of two looped networks and is connected to B, D, E and four websites of G, and an OTDR unit is set on website C, and the optical switch through 1 * 8 is connected to 8 circuits.Suppose that Optical Amplifier Unit and optical channel monitoring unit that the E website receives C website direction have occurred input light simultaneously and lost; Can judge tentatively that then the C website fault occurred to the fibre circuit of E website; At this moment; The port that control unit finds this circuit and binds the optical switch of the OTDR that connects with it according to network topological diagram starts the OTDR that is arranged on the C website after optical switch switches and scans, and control unit compares scanning result and historical normal recordings and (mainly contrasts total attenuation and crucial consumption case point; Comprise and connect attenuation point and optical fiber termination point); To case point that significant change takes place on GIS ground chart display, point out the engineering staff to confirm reason, fix a breakdown.
For situation with route protection scheme; Referring to Fig. 1, A, two websites of B have adopted the four-fiber bidirectional route protection again, suppose that A receives the B direction when leading with the line switching extension wire; Send the master channel monitor optical and lose alarm; Can tentatively judge the fibre circuit generation fiber cut failure of B to A, the optical switch that control unit will be arranged on the OTDR unit on the A website according to alarm switch to B to the master of A with on the circuit, the OTDR unit that starts the A website scans; Draw attenuation curve figure, and breakpoint is marked at the GIS map.
The present invention is not limited only to the looped network shown in the foregoing description, is equally applicable to networks such as linear, tree-like and mesh.
The present invention also provides and has used the method that said system realizes the circuit Intelligent Measurement, may further comprise the steps:
S1, control unit are carried out scan command, and scanning can trigger the alarm or the property abnormality information of the correlation unit of OTDR, and said trigger condition comprises one of following several kinds of situation or its combination:
Relevant alarm appears in S11, optical transmission aspect, and the Optical Amplifier Unit that the receiving terminal that comprises arbitrary website is used to receive the 1550nm window light occurs importing light simultaneously with the light monitoring unit that is used to receive the 1510nm monitor optical and loses alarm;
S12, circuit protected location master channel monitor optical is lost or the alternate channel monitor optical is lost alarm in the network of having used the route protection unit;
S13, optical channel performance detecting unit find that when poll scans descending and surpassing 5dB all appears in all the channel signal luminous powers in the fibre circuit;
After S2, control unit collect above-mentioned alarm and property abnormality information; Unusual fibre circuit is navigated to the OTDR unit in the last website that sends the alarm and the website of property abnormality information through topological diagram; Switch the optical switch in said this website, assign the order of scanning fibre circuit;
S3, OTDR unit report scanning result through its PORT COM to control unit; Control unit is drawn out the decay characteristics curve of corresponding fibre circuit after according to the comparison of the historical record of this result and pad value and optical fiber termination point and decay abnormity point is located, then at the enterprising line identifier of GIS map.
In the above-mentioned steps; The alarm and the collection of property abnormality information and the scanning result of OTDR are accomplished by control unit; Can OTDR be made integrated circuit board is integrated in the equipment; The scanning result of OTDR reports control unit and is encapsulated in the information of control unit, and the monitor channel through 1510nm transmits then.
The present invention is not limited to above-mentioned preferred forms, and anyone should learn the structural change of under enlightenment of the present invention, making, and every have identical or close technical scheme with the present invention, all falls within protection scope of the present invention.
Claims (2)
1. the fibre circuit intelligent checking system that is used for the WDM network; Comprise a plurality of websites that are connected in the fibre circuit; The input of said website, output are respectively equipped with the sending and receiving channel join-splitting device, be respectively applied for merging, separate this website input, output light signal, website comprises:
Optical Amplifier Unit is used to amplify the light signal on the optical transmission line, loses alarm when the 1550nm window light that receives occurs sending input light when input light is lost;
The light monitoring unit is used to send and receive the monitor optical of 1510nm wavelength, loses alarm when the 1510nm monitor optical that receives occurs sending monitor optical when input light is lost;
The optical channel performance detecting unit, the luminous power of all light signals on the poll scan light transmission line is sent the property abnormality alarm when all channel signal luminous powers all occur descending and surpass 5dB;
It is characterized in that said intelligent checking system also comprises a control unit; At least one website is provided with the OTDR unit; Said OTDR unit comprises an OTDR module and a multichannel optical switch, and the test light input/output end port of OTDR unit is connected respectively on the channel join-splitting device of this website input and output side through the multichannel optical switch; Said control unit receives above-mentioned input light and loses alarm, monitor optical and lose alarm and begin to scan fibre circuit with the concurrent out optical fiber line of property abnormality alarm signal road sweep signal to relevant OTDR unit.
2. be used for the fibre circuit intelligent detecting method of WDM network, it is characterized in that may further comprise the steps:
S1, control unit are carried out scan command, and scanning can trigger the alarm or the property abnormality information of the correlation unit of OTDR, and said trigger condition comprises one of following several kinds of situation or its combination:
Relevant alarm appears in S11, optical transmission aspect, and the Optical Amplifier Unit that the receiving terminal that comprises arbitrary website is used to receive the 1550nm window light occurs importing light simultaneously with the light monitoring unit that is used to receive the 1510nm monitor optical and loses alarm;
S12, the master channel monitor optical is lost or the alternate channel monitor optical is lost alarm in the network of having used route protection;
S13, optical channel performance detecting unit find that when poll scans descending and surpassing 5dB all appears in all the channel signal luminous powers in the fibre circuit;
After S2, control unit collect above-mentioned alarm and property abnormality information; Through topological diagram unusual fibre circuit is navigated to and to send the alarm OTDR unit relevant with the website of property abnormality information; Switch the optical switch in the said OTDR unit, assign the order of scanning fibre circuit;
S3, OTDR unit report scanning result through its PORT COM to control unit; Control unit is drawn out the decay characteristics curve of corresponding fibre circuit after according to the comparison of the historical record of this result and pad value and optical fiber termination point and decay abnormity point is located, then at the enterprising line identifier of GIS map.
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