CN106533547A - Electric power optical fiber communication line fault monitoring device - Google Patents

Electric power optical fiber communication line fault monitoring device Download PDF

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Publication number
CN106533547A
CN106533547A CN201610912514.3A CN201610912514A CN106533547A CN 106533547 A CN106533547 A CN 106533547A CN 201610912514 A CN201610912514 A CN 201610912514A CN 106533547 A CN106533547 A CN 106533547A
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CN
China
Prior art keywords
optical fiber
signal
communication line
line fault
power optical
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CN201610912514.3A
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Chinese (zh)
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CN106533547B (en
Inventor
吕立冬
孙晓艳
张增华
李炳林
刘川
喻强
钟成
郭经红
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全球能源互联网研究院
国网河北省电力公司
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Publication of CN106533547A publication Critical patent/CN106533547A/en
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/071Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using a reflected signal, e.g. using optical time-domain reflectometers [OTDRs]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/079Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
    • H04B10/0791Fault location on the transmission path
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/079Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
    • H04B10/0795Performance monitoring; Measurement of transmission parameters
    • H04B10/07955Monitoring or measuring power
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25Arrangements specific to fibre transmission
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50Transmitters
    • H04B10/501Structural aspects
    • H04B10/503Laser transmitters

Abstract

The present invention discloses an electric power optical fiber communication line fault monitoring device. The electric power optical fiber communication line fault monitoring device employs an optical time domain reflection technology to extract distributed Rayleigh scattering optical signals of the electric power optical fiber communication line, employs a coherent detection mode to improve the sensitivity, employs the logarithmic amplifier and average mode to improve the extraction efficiency of the detection signals and employs the laser frequency hopping scheme based on the pulse counting to reduce the fading noise on the time domain reflection curve. The system program of the device controls a laser driving unit, a signal transmit/receive unit and an optical switch communication control unit to realize the control of the laser output frequency, the sending of the detection optical pulse, the collection and processing of the time domain electric signals and the switching of a detected optical fiber line. The electric power optical fiber communication line fault monitoring device is compact in device structure, high in sensitivity and short in measurement time consumption, can support online monitoring, can rapidly poll all the optical fiber communication lines in a transformer substation communication machine room, and is wide in monitoring range and high in timeliness.

Description

Power optical fiber communication line fault monitoring device

Technical field

The invention belongs to the communications field, and in particular to a kind of power optical fiber communication line is characterized, event recognition and failure are fixed The power optical fiber communication line fault monitoring device of position.

Background technology

Generally at several kilometers between several hundred kilometers, line fault monitoring generally adopts light to power optical fiber communication line length Time-domain reflectomer.Optical time domain reflectometer is recognized and is positioned using the optical radar principle in optical fiber, i.e. optical time domain reflection technology Failure on fibre circuit.In view of the importance of energy communication service, in order to avoid the strong letter that optical time domain reflectometer sends Number light pulse may cause nonlinear optical effect in fibre circuit and cause communication bit error rates to increase, in power system, On-line monitoring scheme is adopted seldom.Further, since optical time domain reflectometer adopts direct detection mode, the sensitivity of its detection is low, Anti- optical interference is poor, it is difficult to realize that more than extra long distance (200km) is monitored.Additionally, in transformer substation communication machine room, with surrounding its The fibre circuit of his transformer station's connection communication typically has tens of even up to a hundred, the monitoring to every fibre circuit health status And management, it is the important content of communication of power system O&M, therefore is highly desirable to according to the characteristics of power optical fiber circuit and logical The objective demand of fuse tube reason, develops corresponding device.High sensitivity detection is carried out to power optical fiber circuit can adopt coherent light Time-domain reflectomer, it has used coherent detection technology and narrow-band filtering method on the basis of optical time domain reflection technology, using phase Dry Detection Techniques are relevant (heterodyne) with local oscillator light by detecting light, and the power of detectable signal light is transferred to relevant intermediate-freuqncy signal On, then pass through carries out narrow-band filtering and can just curb most of out-of-band noise to intermediate-freuqncy signal, so as to lift the dynamic of measurement State scope.

In Coherent optical time domain reflectometer, the work of core the most is to reduce the decline noise on detective curve, because on curve Decline noise directly affect identification and positioning precision to event on curve or failure.Due to declining, noise comes from LASER Light Source Remarkable coherence, people generally adopt laser frequency mode, using under different laser frequencies measurement data it is average rapidly Reduce decline noise.Zhang Xuping of Nanjing University et al. proposes multifrequency detection Optical Time Division Multiplexing Coherent optical time domain reflectometer scheme (patent of invention title:Multifrequency detects Optical Time Division Multiplexing Coherent optical time domain reflectometer method and apparatus, application number: 201110359921.3, the laser frequency sample for detection is greatly increased by way of time-division and frequency division, so as to reduce The decline noise of detective curve, but laser frequency is fixed, and frequency samples lack change.Japanese NTT companies H.Izumita et al., it is proposed that increase the scheme of detection light frequency sample (see paper based on laser drive current is changed: Izumita H,Koyamada Y,Furukawa S,Sankawa I.Stochastic amplitude fluctuation in coherent OTDR and a new technique for its reduction by stimulating synchronous optical frequency hopping.J.Lightw.Technol.1997;15:267-278.), every The individual direct impulse cycle all synchronously changes laser frequency, most at last decline noise be reduced to below 0.1dB so that identification and Event or failure on positioning fibre circuit becomes simple.But, the program is swashed in each direct impulse cycle synchronous change The driving current of light device is so that the output frequency saltus step of laser instrument, this will increase the time of measuring of system, such as, changes from sending instructions Becoming laser drive current needs the 5ms times to laser stabilization rate-adaptive pacemaker, if measuring results are 100,000 measurement knots Really (each measurement result correspondence 1 pulse period) it is average, then, the time that system is expended during laser instrument frequency hopping is 500s.This can have a strong impact on the efficiency patrolled and examined to fibre circuit in the patrolling and examining of power optical fiber circuit.Additionally, during current light Domain reflectometer or Coherent optical time domain reflectometer, not subsidiary line data-logging function also need to do on its basis secondary development and integrated.

The content of the invention

For the deficiencies in the prior art, the present invention proposes a kind of power optical fiber communication line fault monitoring device, and it adopts Coherent detection mode lifts detectivity, logarithmic detector and average mode and is lifted to the extraction efficiency of detectable signal, based on arteries and veins The laser hopping scheme that punching is counted is reducing the decline noise on optical time domain reflection curve.

The power optical fiber communication line fault monitoring device that the embodiment of the present invention is proposed, including:Laser instrument, laser instrument drive Unit, the first fiber coupler, the second fiber coupler, fiber amplifier, acousto-optic modulator, acousto-optic modulator drive, optical fiber Circulator, photoswitch, scrambler, balance photodetector, radio frequency amplifier, radio frequency band filter, logarithmic detector, signal Send out/receive unit and processor;First fiber coupler described in the laser Jing that the laser instrument sends is divided into two-way, connects institute all the way Fiber amplifier is stated, another road connects the scrambler;The output end of the scrambler connects second fiber coupler A certain input, so as to the continuous light for producing the laser instrument is used as local oscillator light;The output end connection of the fiber amplifier The acousto-optic modulator, the acousto-optic modulator drive the acousto-optic modulator to make which that continuous light of input is become light arteries and veins Punching output, and make the light frequency of light pulse that a certain fixation occur relative to the frequency of the continuous light for being input to the acousto-optic modulator Frequency shifts, its numerical value be equal to the acousto-optic modulator frequency shift amount;The output end of the acousto-optic modulator connects the light The first port of fine circulator, the second port of the optical fiber circulator connect an input of the photoswitch, and the light is opened The output end of pass connects tested power optical fiber communication line;Light pulse is dorsad auspicious in tested power optical fiber communication line The second port of optical fiber circulator described in sharp scattered signal light Jing and the 3rd port enter the another of second fiber coupler Input;Back rayleigh scattering flashlight is mixed in second fiber coupler with local oscillator light, produces relevant intermediate frequency envelope Signal, and relevant intermediate frequency envelope signal is converted into corresponding radiofrequency signal by balance photodetector described in Jing;The radio frequency is put Big device amplifies the radiofrequency signal of the balance photodetector output, then radio frequency band filter filters out-of-band noise described in Jing, To lift the signal to noise ratio of radiofrequency signal;The radiofrequency signal that the radio frequency band filter is exported is converted into by the logarithmic detector Voltage signal is exported;Voltage signal of the unit collection from logarithmic detector output is sent out/received to the signal, and chronologically carries out Superposition, is finally averaging, and transfers data to the processor;The data-interface of the processor respectively with the laser instrument Unit is sent out/received to driver element, the signal, the Communications Control Interface of the photoswitch is connected, by sending to the photoswitch Instruction, makes the photoswitch that light path is switched to appointed fibre circuit;And control electric pulse in the signal/receipts unit Transmission and the collection to the logarithmic detector output voltage signal, send out when the signal/receive the electric pulse that unit sends When number often reaches the integral multiple of a certain fixed numbers, the signal is sent out/is received cell operation and suspends a certain set time, same with this When, the processor controls the laser drive unit change thermosensitive resistance changes the output frequency of the laser instrument Become, after the signal/receipts unit time out terminates, work on, when the electric pulse number for sending reaches setting value Terminate, the processor carries out linear transformation to the data that the signal/receipts unit sends, and deducts the balance photoelectricity The average noise power of detector, obtains optical time domain reflection curve, and according to optical-fiber line fault identification and location algorithm from light Recognize in Time Domain Reflectometry curve and position optical-fiber line fault;Wherein, the range information of tested optical fiber is also turned by the processor Change into the geographical location information of power optical fiber communication line shaft tower serial number, and power optical fiber line fault information is carried out Record, the power optical fiber line fault information include tested optical fiber line name, two shaft towers numbering of trouble point neighbour and The distance of a relatively low shaft tower is numbered in trouble point and the two shaft towers.

The running of the power optical fiber communication line fault monitoring device in the embodiment of the present invention is as follows:

1) processor sends to the photoswitch and instructs, and makes the photoswitch that light path is switched to tested electric power light Fiber communication circuit.

2) processor controls the signal and sends out/receive the transmission of electric pulse in unit and to logarithmic detector output The collection of voltage signal, when the electric pulse number that unit transmission was sent out/received to the signal often reaches the integral multiple of a certain fixed numbers When, signal is sent out/is received cell operation and suspends a certain set time, and at the same time, it is single that the processor controls the laser instrument driving Unit makes the output frequency of the laser instrument change, and after the signal/receipts unit time out terminates, works on, directly Terminate when reaching setting value to the electric pulse number for sending.

3) processor carries out linear transformation to the data that the signal/receipts unit sends, and deducts described flat The average noise power of weighing apparatus photodetector, obtains optical time domain reflection curve, and is recognized according to optical-fiber line fault and position calculation Method is recognized from optical time domain reflection curve and positions optical-fiber line fault.

4) program software of the processor is converted into the range information of tested optical fiber with power optical fiber communication line pole The geographical location information of tower serial number.

5) the program software record electricity optical-fiber line fault information of the processor, content include tested optical fiber circuit name The distance of a relatively low shaft tower is numbered in title, two shaft towers numberings of trouble point neighbour and trouble point and the two shaft towers.

Alternatively, the power optical fiber communication line fault monitoring device in the embodiment of the present invention, the laser instrument is from drive Streaming current and the adjustable semiconductor laser of thermistor.

Alternatively, the power optical fiber communication line fault monitoring device in the embodiment of the present invention, the optical fiber circulator choosing With the optical fiber circulator of 3 ports.

Alternatively, the power optical fiber communication line fault monitoring device in the embodiment of the present invention, second fiber coupling Device selects 2 × 2 3dB fiber couplers.

Alternatively, the power optical fiber communication line fault monitoring device in the embodiment of the present invention, according to the logarithmic detector The log power of device input radio frequency signal and the linear relationship of output voltage, the processor are sent out/are received unit and send out to the signal The data sent carry out linear transformation, and the magnitude of voltage of each data point is converted into the log power value of radiofrequency signal.

Alternatively, the power optical fiber communication line fault monitoring device in the embodiment of the present invention, when the signal sends out/receive single When the electric pulse number that unit sends often reaches 1000 integral multiple, the signal is sent out/is received cell operation and suspends 5 milliseconds.

Alternatively, the optical fiber telecommunications line fault monitoring device in the embodiment of the present invention, the processor control the letter Number send out/receive unit and the laser drive unit work before, first control the photoswitch, make the photoswitch by setting Fibre circuit order switches, and the measurement data that the processor is obtained is preserved by fibre circuit title, and is converted into based on electric power The geography information of optical fiber communication line line pole tower numbering shows.

Alternatively, the power optical fiber communication line fault monitoring device in the embodiment of the present invention, the laser after change The thermosensitive resistance of device is to can guarantee that a certain random value in the range of the thermistor of the laser instrument normal work.

Embodiment of the present invention technical scheme, has the advantage that:

Power optical fiber communication line fault monitoring device according to the present invention, increases on the basis of Coherent optical time domain reflectometer Fibre circuit line walking monitoring function, introduces the power of logarithmic detector rapid extraction radiofrequency signal, hard so as to reduce system The difficulty that part is designed and developed, changes laser frequency using laser instrument thermo-sensitive resistor is changed, to laser output frequency precision controlling More accurately, the laser frequency stabilization time is shorter, especially with the laser hopping scheme based on step-by-step counting, in measurement device During, consume shorter in the time of laser frequency hopping adjustment, if per 1000 pulse periods every frequency hopping once, laser frequency hopping Time loss is only the 1/1000 of each pulse period hopping scheme, but final measurement is almost identical.The present invention is related to And power optical fiber communication line fault monitoring device compact conformation, sensitivity is high, time of measuring consumes short, can support online prison Survey, and can all of optical fiber telecommunications line in fast inspection transformer substation communication machine room, possess that monitoring range is wide, the spy that real-time is high Point.The present invention adopt with the geography information characteristic manner of power optical fiber communication line shaft tower serial number, by tested optical fiber away from The information of the shaft tower sequence number away from the actual position of optical fiber and nearest neighbor distance is converted into from information, so as to convenient to power optical fiber line The clear description of position of failure point in road, describes according to simple and practical relative to the latitude and longitude information using map.

Description of the drawings

In order to be illustrated more clearly that the specific embodiment of the invention or technical scheme of the prior art, below will be to concrete Needed for embodiment or description of the prior art, accompanying drawing to be used is briefly described, it should be apparent that, in describing below Accompanying drawing is some embodiments of the present invention, for those of ordinary skill in the art, before creative work is not paid Put, can be with according to these other accompanying drawings of accompanying drawings acquisition.

Fig. 1 is a kind of structure chart of power optical fiber communication line fault monitoring device proposed by the present invention;

Fig. 2 is laser instrument thermistor according to the present invention and laser output wavelength variation relation figure;

Fig. 3 is logarithmic detector input radio frequency power according to the present invention and output voltage graph of a relation;

Fig. 4 is that the optical time domain reflection that a kind of power optical fiber communication line fault monitoring device proposed by the present invention is measured is bent Line;

Fig. 5 is tested optical fiber distance of the present invention and power optical fiber communication line shaft tower mapping relations figure.

Specific embodiment

The technical scheme of the embodiment of the present invention is clearly and completely described below in conjunction with accompanying drawing, it is clear that described Embodiment be a part of embodiment of the invention, rather than the embodiment of whole.Based on the embodiment in the present invention, this area is general The every other embodiment obtained under the premise of creative work is not made by logical technical staff, belongs to present invention protection Scope.

In the description of the embodiment of the present invention, it should be noted that term " " center ", " on ", D score, "left", "right", The orientation of the instruction such as " vertical ", " level ", " interior ", " outward " or position relationship be based on orientation shown in the drawings or position relationship, It is for only for ease of the description embodiment of the present invention and simplifies description, rather than indicates or imply that the device or element of indication must have Have specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.Additionally, term " the One ", " second ", " the 3rd " are only used for describing purpose, and it is not intended that indicating or implying relative importance.

In the description of the embodiment of the present invention, it should be noted that unless otherwise clearly defined and limited, term " peace Dress ", " being connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected, or be detachably connected, or integratedly Connection;Can be mechanically connected, or electrically connect;Can be joined directly together, it is also possible to be indirectly connected to by intermediary, The connection of two element internals is can also be, can be wireless connection, or wired connection.For the common skill of this area For art personnel, above-mentioned term concrete meaning in the present invention can be understood with concrete condition.

As long as additionally, the non-structure each other of technical characteristic involved in invention described below different embodiments Can just be combined with each other into conflict.

Below in conjunction with the accompanying drawings the specific embodiment of the present invention is described in further detail.

A kind of power optical fiber communication line fault monitoring device that the present embodiment is provided, its structure is as shown in figure 1, it wraps Include:

Laser instrument 1, for producing single-frequency laser, for detection light and local oscillator light needed for monitoring device, from narrow linewidth Semiconductor laser, model:RIO0175-3, manufacturer:REDFERN INTEGRATED OPTICS INC. companies of the U.S..

Laser drive unit 1a, for driving laser instrument 1 so as to which output frequency is anti-raw to be changed, from RIO0175-3 certainly The driving of band, can carry out laser diode current and adjust and thermistor regulation, and the output wavelength of laser instrument 1 is corresponding with thermistor Relation is as shown in Figure 2.

First fiber coupler 2a, for light splitting, all the way for detecting light, all the way for local oscillator light, from 1 × 2 type, Splitting ratio 90:10.

Second fiber coupler 2b, for optical coupled and mixing, local oscillator light is coupled with detection optical signal, and makes the two Mixing produces intermediate frequency envelope, from 2 × 2 types, splitting ratio 50:50, i.e. 3dB fiber couplers.

Fiber amplifier 3, for lifting the power of detection light, amplifies output type, power output from invariable power 17.0dBm。

Acousto-optic modulator 4, for continuous laser is modulated into light pulse, is produced from Gooch&Housego companies of Britain FSO2728-T-M040 models, the frequency of light wave of output optical pulse is relative to moving 40MHz in input light.

Acousto-optic modulator drives 4a, drives acousto-optic modulator 4 to make which be modulated the continuous light being input into, selects The supporting driving of FSO2728-T-M040 models.

Optical fiber circulator 5, for directive sending from light pulse to tested optical fiber, and the back of the body of the light pulse in tested optical fiber To the directional transmissions of Rayleigh scattering light.

Photoswitch 6, for switching tested optical fiber.

Scrambler 7, makes the optical polarization randomization of input light therein, is made an uproar with reducing the polarization during coherent detection Sound, from the PSM-001 models of U.S.'s General Photonics Corporation productions.

Balance photodetector 8, detects for optical coherence, from the PBD450C-AC of Thorlabs companies of U.S. production Model.

Radio frequency amplifier 9, for amplifying the power of radiofrequency signal.

Radio frequency band filter 10, for being filtered noise reduction to fixed a certain intermediate-freuqncy signal.

Logarithmic detector 11, for extracting the power of radiofrequency signal, from the production of Mini-Circuits companies of the U.S. ZX47-60LN+ models, 11 input radio frequency signal power of logarithmic detector are as shown in Figure 3 with output voltage relation.

Signal send out/receive unit 12, for acousto-optic modulator drive 4a send electric pulse, and then make acousto-optic modulator 4 will It is input into continuous light modulation therein to export into light pulse.

Processor 13, for communicating, controlling and data access, process, display.

Specifically, as shown in figure 1, the first coupler 2a described in the laser Jing that sends of the laser instrument 1 is divided into two-way, all the way Connect the fiber amplifier 3, another road connects the scrambler 7.

The output end of the scrambler 7 connects a certain input of the second fiber coupler 2b, so as to swash described The continuous light that light device 1 is produced is used as local oscillator light.

The output end of the fiber amplifier 3 connects the acousto-optic modulator 4, and the acousto-optic modulator drives 4a to drive institute State acousto-optic modulator 4 and the continuous light being input into is become into light pulse output, and the light frequency of light pulse is made relative to being input to acousto-optic Frequency shifts 40MHz of the continuous light of modulator 4.

The output end of the acousto-optic modulator 4 connects the first port of the optical fiber circulator 5, the optical fiber circulator 5 Second port connect an input of photoswitch 6, the output end of the photoswitch 6 connects tested power optical fiber order wire Road, then, the first port and second port of the light pulse Jing optical fiber circulators of the output of acousto-optic modulator 4, then through photoswitch 6 It is injected into tested power optical fiber communication line.

Photoswitch 6 described in back rayleigh scattering flashlight Jing of the light pulse in tested power optical fiber communication line is returned Return, then the second port of optical fiber circulator 5 described in Jing and the 3rd port enter another input of the second fiber coupler 2b End.

Back rayleigh scattering flashlight is mixed in the second fiber coupler 2b with local oscillator light, is produced frequency and is 40MHz intermediate frequency envelope signals, and balance photodetector 8 described in Jing the intermediate frequency envelope signal is converted into frequency being 40MHz's Radiofrequency signal.

The radio frequency amplifier 9 amplifies the radiofrequency signal of balance photodetector 8 output, then Jing centre frequencies are 40MHz, the radio frequency band filter 10 with a width of 5MHz filter out-of-band noise, to lift the signal to noise ratio of radiofrequency signal.

It is defeated that the radiofrequency signal that the radio frequency band filter 10 is exported is converted into voltage signal by the logarithmic detector 11 Go out.

The signal is sent out/is received unit 12 and gathers from the logarithmic detector 11 voltage signal for exporting, and chronologically carries out Superposition, is finally averaging, and transfers data to the processor 13.

The data-interface of the processor 13 respectively with the laser drive unit 1a, the signal send out/receive unit 12, The Communications Control Interface of the photoswitch 6 is connected.

The processor 13 sends the thermistor that instruction changes the laser instrument 1 to the laser drive unit 1a Value, so that the output frequency of the laser instrument 1 changes, as shown in Figure 3:

The present invention relates to a kind of power optical fiber communication line fault monitoring device running is as follows:

1) processor 13 sends to the photoswitch 6 and instructs, and makes the photoswitch 6 that light path is switched to what is be formulated Fibre circuit;

2) processor 13 controls the signal and sends out/receive the transmission of electric pulse in unit 12 and to the logarithmic detector The collection of 11 output voltage signals, when the electric pulse number that the transmission of unit 12 was sent out/received to the signal often reaches 1000 integral multiple When, signal send out/receive 12 work stoppage 5ms of unit, at the same time, the processor 13 control the laser drive unit 1a with Machine changes thermosensitive resistance makes the output wavelength/frequency of the laser instrument 1 change, and the signal is sent out/received unit 12 and suspends After time terminates, work on, until the electric pulse number for sending reaches 100000;

3) data that 13 pairs of signals of the processor/receipts unit 12 sends are by radiofrequency signal as shown in Figure 3 Power carries out linear transformation with voltage conversion relation, and deducts the average noise power for balancing photodetector 8, obtains light Time Domain Reflectometry curve, as shown in figure 4, and recognize from optical time domain reflection curve according to optical-fiber line fault identification and location algorithm With positioning optical-fiber line fault;

4) program software of the processor 13 is converted into the range information of tested optical fiber with power optical fiber communication line The geographical location information of shaft tower serial number, the mapping relations that the transfer process is related to are as shown in Figure 5.

5) the program software record electricity optical-fiber line fault information of the processor 13, content include tested optical fiber circuit The distance of a relatively low shaft tower is numbered in title, two shaft tower numberings of trouble point neighbour and trouble point and the two shaft towers, than As between AB lines, 3#4# shaft towers, at 300 meters of 3# shaft towers.

Finally it should be noted that:Above example is only to illustrate technical scheme rather than a limitation, most Pipe has been described in detail to the present invention with reference to above-described embodiment, and those of ordinary skill in the art should be understood:Still The specific embodiment of the present invention can be modified or equivalent, and without departing from any of spirit and scope of the invention Modification or equivalent, which all should be covered in the middle of scope of the presently claimed invention.

Claims (8)

1. a kind of power optical fiber communication line fault monitoring device, it is characterised in that include:Laser instrument (1), laser instrument drive single First (1a), the first fiber coupler (2a), the second fiber coupler (2b), fiber amplifier (3), acousto-optic modulator (4), acousto-optic Modulator drives (4a), optical fiber circulator (5), photoswitch (6), scrambler (7), balance photodetector (8), radio frequency amplifier (9), radio frequency band filter (10), logarithmic detector (11), signal send out/receive unit (12) and processor (13);
Described in the laser Jing that laser instrument (1) sends, the first fiber coupler (2a) is divided into two-way, connects the optical fiber all the way Amplifier (3), another road connect scrambler (7);
The output end of scrambler (7) connects a certain input of the second fiber coupler (2b), so as to swash described The continuous light that light device (1) is produced is used as local oscillator light;
The output end of fiber amplifier (3) connects acousto-optic modulator (4), and the acousto-optic modulator drives (4a) to drive Acousto-optic modulator (4) make which that continuous light of input is become light pulse output, and make the light frequency of light pulse relative to defeated There are the frequency shifts of a certain fixation in the frequency for entering the continuous light to the acousto-optic modulator (4), its numerical value is equal to the acousto-optic The frequency shift amount of modulator (4);
The output end of acousto-optic modulator (4) connects the first port of optical fiber circulator (5), the optical fiber circulator (5) second port connects an input of photoswitch (6), and the output end of photoswitch (6) connects tested electric power Optical fiber telecommunications line;
Optical fiber circulator (5) described in back rayleigh scattering flashlight Jing of the light pulse in tested power optical fiber communication line Second port and the 3rd port enter another input of the second fiber coupler (2b);
The mixing in the second fiber coupler (2b) with local oscillator light of back rayleigh scattering flashlight, produces relevant intermediate frequency envelope Signal, and relevant intermediate frequency envelope signal is converted into corresponding radiofrequency signal by balance photodetector (8) described in Jing;
Described radio frequency amplifier (9) amplify the radiofrequency signal that balance photodetector (8) exports, then radio frequency band logical described in Jing Wave filter (10) filters out-of-band noise, to lift the signal to noise ratio of radiofrequency signal;
It is defeated that the radiofrequency signal that the radio frequency band filter (10) is exported is converted into voltage signal by logarithmic detector (11) Go out;
The voltage signal that unit (12) collection is exported from the logarithmic detector (11) is sent out/received to the signal, and chronologically carries out Superposition, is finally averaging, and transfers data to the processor (13);
The data-interface of processor (13) sends out/receipts unit respectively with the laser drive unit (1a), the signal (12), the Communications Control Interface of photoswitch (6) is connected, and is instructed by sending to the photoswitch (6), makes the photoswitch (6) light path is switched to into appointed fibre circuit;And control the signal and send out/receive the transmission of electric pulse in unit (12) and right The collection of logarithmic detector (11) output voltage signal, when the electric pulse number that the signal/receipts unit (12) send When often reaching the integral multiple of a certain fixed numbers, unit (12) the work stoppage a certain set time is sent out/received to the signal, same with this When, described processor (13) control laser drive unit (1a) change thermosensitive resistance and make the defeated of the laser instrument (1) Go out frequency to change, after the signal/receipts unit (12) time out terminates, work on, until the electric pulse for sending Number terminates when reaching setting value, and processor (13) enter line to the data that the signal/receipts unit (12) send Property conversion, and deduct the average noise power of balance photodetector (8), obtain optical time domain reflection curve, and according to light Fine line fault identification and location algorithm are recognized from optical time domain reflection curve and position optical-fiber line fault;
Wherein, it is described processor (13), also the range information of tested optical fiber is converted into suitable with power optical fiber communication line shaft tower The geographical location information of sequence numbering, and power optical fiber line fault information is recorded, the power optical fiber line fault letter Breath is numbered relatively low in including tested optical fiber line name, two shaft tower numberings of trouble point neighbour and trouble point and the two shaft towers The distance of one shaft tower.
2. power optical fiber communication line fault monitoring device according to claim 1, it is characterised in that the laser instrument (1) driving current and the adjustable semiconductor laser of thermistor are selected.
3. power optical fiber communication line fault monitoring device according to claim 1, it is characterised in that the fiber annular Optical fiber circulator of the device (5) from 3 ports.
4. power optical fiber communication line fault monitoring device according to claim 1, it is characterised in that second optical fiber Coupler (2b) selects 2 × 2 3dB fiber couplers.
5. power optical fiber communication line fault monitoring device according to claim 1, it is characterised in that according to the logarithm The log power of wave detector (11) input radio frequency signal and the linear relationship of output voltage, processor (13) are to the signal Sending out/receive unit (12) data that send carries out linear transformation, and the magnitude of voltage of each data point is converted into the right of radiofrequency signal Number performance number.
6. the power optical fiber communication line fault monitoring device according to any one of claim 1-5, it is characterised in that work as institute When stating signal and sending out/receive unit (12) the electric pulse number that sends and often reach 1000 integral multiple, the signal sends out/receive unit (12) 5 milliseconds of work stoppage.
7. optical fiber telecommunications line fault monitoring device according to claim 6, it is characterised in that described processor (13) are controlled Before making the signal/receipts unit (12) and the laser drive unit (1a) work, the photoswitch (6) is first controlled, The photoswitch (6) is made to switch by the fibre circuit order of setting, the measurement data that processor (13) obtain is by optical fiber cable Road title is preserved, and the geography information for being converted into being numbered based on power optical fiber communication line shaft tower is shown.
8. the power optical fiber communication line fault monitoring device according to any one of claim 1-5, it is characterised in that change The thermosensitive resistance of the laser instrument (1) afterwards is can guarantee that in the range of the thermistor of the laser instrument (1) normal work A certain random value.
CN201610912514.3A 2016-10-19 2016-10-19 Power optical fiber communication line fault monitoring device CN106533547B (en)

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