CN107588926A - A kind of fault monitoring system and method for overlength optical cable - Google Patents
A kind of fault monitoring system and method for overlength optical cable Download PDFInfo
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Abstract
The present invention discloses a kind of fault monitoring system and method for overlength optical cable, belongs to overlength optical cable detection technology field.The fault monitoring system of the overlength optical cable of the present invention, including：First Brillouin light tim e- domain detection system, the second Brillouin light tim e- domain detection system, uplink optical fiber, downlink optical fiber and the multiple optical repeaters being arranged in each segmentation of the uplink optical fiber and downlink optical fiber, the first Brillouin light tim e- domain detection system, the second Brillouin light tim e- domain detection system are used for emission detection pulsed light to the uplink optical fiber and downlink optical fiber, and the scattered Brillouin's optical signal of the back of the body and analysis for collecting the direct impulse light scattering in the optical fibre channel obtain the Monitoring Data of each point on optical fibre channel.The original temperature and strain data that the fault monitoring system and method for the overlength optical cable of the present invention are obtained using the scattered brillouin scattering signal of the back of the body of collection realize high-precision fault location and diagnosis so as to analyze the fault message of optical cable abnormity point.
Description
Technical field
The present invention relates to a kind of fault monitoring system and method for overlength optical cable, belong to overlength optical cable detection technology field.
Background technology
With the fast development of China's economic society, electricity needs is continuously increased.Extra-high voltage direct-current power network have transmission of electricity away from
From length, capacity is big, line loss is low, saves the features such as line corridor, is to realize " transferring electricity from the west to the east, north and south supply mutually, national network "
The important channel of this national strategic aim.With the quickening of UHVDC Transmission Lines engineering construction speed, safety problem also day
Benefit is prominent, and how to find failure in time is current important topic.Currently, overlength submarine optical fiber cable carries international telecommunication service amount
90%, and submarine optical fiber cable easily injury is by artificial and Effect of Natural Disaster.Therefore, to the quick and precisely positioning of extra large cable line fault,
Maintenance personal is quickly repaired to failure, the expense of operation extra large cable communication system can be reduced.Tieed up in overlength optical cable
During repairing, a big key technology is the detection of trouble point and is accurately positioned.Currently mainly utilize optical time domain reflectometer (OTDR)
The positioning of optical cable is carried out, but OTDR can only measure distance of the fiber failure point away from test point, it is difficult to obtain the temperature of trouble point optical cable
Degree and strain information.Therefore, optical cable scents a hidden danger there is an urgent need to a kind of accurately fault point diagnosing method, improves O＆M in time
Efficiency.
The content of the invention
It is an object of the invention to provide a kind of fault monitoring system and method for overlength optical cable, using Brillouin light time domain
Detecting system realizes the real time on-line monitoring of overlength optical cable, the original temperature obtained using the scattered brillouin scattering signal of the back of the body of collection
With strain data so as to analyze the fault message of optical cable abnormity point, high-precision fault location and diagnosis are realized.
It is as follows that the present invention provides technical scheme：
On the one hand, the invention provides a kind of fault monitoring system of overlength optical cable, including：First Brillouin light time domain is examined
Examining system, the second Brillouin light tim e- domain detection system, uplink optical fiber, downlink optical fiber and it is arranged at described up logical
Multiple optical repeaters in road optical fiber and each segmentation of downlink optical fiber, the two of the uplink optical fiber and downlink optical fiber
End is connected with the first Brillouin light tim e- domain detection system and the second Brillouin light tim e- domain detection system respectively, first cloth
In deep optical time domain detecting system, the second Brillouin light tim e- domain detection system be used for emission detection pulsed light to the uplink light
Fine and downlink optical fiber, the back of the body for collecting the direct impulse light scattering in the optical fibre channel dissipate Brillouin's optical signal and analysis
Obtain the Monitoring Data of each point on optical fibre channel.
According to an embodiment of the present invention, the first Brillouin light tim e- domain detection system and/or the second Brillouin light
Tim e- domain detection system includes：
Pulsed light emission module, for emission detection pulsed light to the uplink optical fiber and downlink optical fiber；
Brillouin's measurement module, the back of the body for collecting direct impulse light scattering in the optical fibre channel dissipate Brillouin's optical signal
Obtain Brillouin shift information；
Analysis module, the Monitoring Data of each point on the optical fibre channel is obtained for analyzing the Brillouin shift information,
And monitoring curve is generated, the Monitoring Data is raw temperature data and strain data, and the monitoring curve is that temperature average is bent
Line and strain Mean curve.
According to another embodiment of the present invention, the Brillouin shift information and raw temperature data and strain data
Linear relationship is：
υ B (T, ε)=υ B (T0, ε 0)+CvT Δ T+Cv ε Δs ε
Wherein υ B (T, ε) are the Brillouin shifts being in the optical fiber under temperature T and strain stress；
υ B (T0, ε 0) are the initial frequency displacements of Brillouin being in the optical fiber under initial temperature T0 and initial strain ε 0；CvT is
The temperature coefficient of Brillouin shift；Cv ε are the coefficients of strain of Brillouin shift；Δ T and Δ ε be respectively relative to initial temperature and
The variable quantity of initial strain.
According to another embodiment of the present invention, the optical repeater includes the first erbium-doped fiber amplifier, the second er-doped
Fiber amplifier and connection first erbium-doped fiber amplifier, the interface channel of the second erbium-doped fiber amplifier, described first
Erbium-doped fiber amplifier, the second erbium-doped fiber amplifier are Unidirectional magnifier, for amplifying the direct impulse optical signal, institute
State the first erbium-doped fiber amplifier and be arranged at the uplink optical fiber, second erbium-doped fiber amplifier be arranged at it is described under
Row path optical fiber.
According to another embodiment of the present invention, first erbium-doped fiber amplifier is internally provided with the first isolator,
Second erbium-doped fiber amplifier is internally provided with the second isolator, and first isolator, the second isolator are used to isolate
The scattered light signal of the direct impulse light inversely transmitted.
According to another embodiment of the present invention, the optical repeater also includes the first photoswitch and the second photoswitch, if
It is placed on the interface channel, first photoswitch and the second photoswitch are connected, for controlling cutting for different interface channels
Change.
According to another embodiment of the present invention, when first photoswitch connects first erbium-doped fiber amplifier
Output end, when second photoswitch connects the input of second erbium-doped fiber amplifier, the first interface channel is connected, shape
Into the first uplink test loop, the first uplink test loop is to be passed through from the first Brillouin light tim e- domain detection system
Cross uplink optical fiber, the first erbium-doped fiber amplifier, downlink optical fiber and return to the first Brillouin light tim e- domain detection system；
When first photoswitch connects the output end of first erbium-doped fiber amplifier, the second photoswitch connection
When connecting the output end of second erbium-doped fiber amplifier, the second interface channel is connected, and is formed the second uplink and is tested back
Road, the second uplink test loop are by uplink optical fiber, first from the first Brillouin light tim e- domain detection system
Erbium-doped fiber amplifier, the second erbium-doped fiber amplifier, downlink optical fiber return to the first Brillouin light tim e- domain detection system.
According to another embodiment of the present invention, when first photoswitch connects first erbium-doped fiber amplifier
Input, when second photoswitch connects the output end of second erbium-doped fiber amplifier, the 3rd interface channel is connected, shape
Into the first downlink test loop, the first downlink test loop is to be passed through from the second Brillouin light tim e- domain detection system
Cross downlink optical fiber, the first erbium-doped fiber amplifier, uplink optical fiber and return to the second Brillouin light tim e- domain detection system；
When first photoswitch connects the input of first erbium-doped fiber amplifier, the second photoswitch connection
During the input of second erbium-doped fiber amplifier, the 4th interface channel is connected, and forms the second downlink test loop, institute
It is by downlink optical fiber, the second er-doped light from the second Brillouin light tim e- domain detection system to state the second downlink test loop
Fiber amplifier, the first erbium-doped fiber amplifier, uplink optical fiber return to the second Brillouin light tim e- domain detection system.
On the other hand, present invention also offers a kind of fault monitoring method of overlength optical cable, including：
Emission detection pulsed light is to uplink optical fiber and downlink optical fiber；
The back of the body for collecting direct impulse light scattering in optical fibre channel dissipates Brillouin's optical signal acquisition Brillouin shift information；
Analyze the Brillouin shift information and obtain the raw temperature data and strain data of each point on optical fibre channel；
According to the raw temperature data of each point on the optical fibre channel and strain data generation temperature Mean curve and strain
Mean curve.
Beneficial effects of the present invention are as follows：
The fault monitoring system and method for the overlength optical cable of the present invention only collect the back scattering Brillouin light signal in optical fiber,
To obtain the original temperature and strain data of every bit along the optical fiber under a large amount of optical cable normal operations.Brillouin light tim e- domain detection
Network analysis original temperature and strain data, long-time Monitoring Data is averaged, to obtain the temperature of the optical cable and strain
The Mean curve of Monitoring Data.The fault monitoring system of the overlength optical cable of the present invention includes the first Brillouin light tim e- domain detection system
System, the second Brillouin light tim e- domain detection system, uplink optical fiber, downlink optical fiber and be arranged at uplink optical fiber and
Multiple optical repeaters in each segmentation of downlink optical fiber, its is simple in construction, is realized using Brillouin light tim e- domain detection system super
The real time on-line monitoring of long optical cable, using the back of the body of collection dissipate the obtained original temperature of brillouin scattering signal and strain data so as to
The fault message of optical cable abnormity point is analyzed, compared with the optical fiber temperature monitoring system based on Raman scattering, the system can be surveyed simultaneously
Original temperature and strain data are measured, fault message is improved and judges accuracy.The fault monitoring system of the overlength optical cable of the present invention
Difference according to test environment is realized by photoswitch, any switching laws are done to test loop, further realize the event of higher precision
Barrier positioning and diagnosis.
Brief description of the drawings
Fig. 1 is the structured flowchart of one embodiment of the fault monitoring system of the overlength optical cable of the present invention；
Fig. 2 is the structural representation of one embodiment of the Brillouin light tim e- domain detection system of the present invention；
Fig. 3 is the structural representation of the first embodiment of the optical repeater of the present invention；
Fig. 4 is the structural representation of the second embodiment of the optical repeater of the present invention；
Fig. 5 is one embodiment of the first uplink test loop of the fault monitoring system of the overlength optical cable of the present invention
Schematic diagram；
Fig. 6 is one embodiment of the second uplink test loop of the fault monitoring system of the overlength optical cable of the present invention
Schematic diagram；
Fig. 7 is one embodiment of the first downlink test loop of the fault monitoring system of the overlength optical cable of the present invention
Schematic diagram；
Fig. 8 is one embodiment of the second uplink test loop of the fault monitoring system of the overlength optical cable of the present invention
Schematic diagram；
Fig. 9 is the schematic flow sheet of one embodiment of the fault monitoring method of the overlength optical cable of the present invention.
Embodiment
To make the technical problem to be solved in the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and tool
Body embodiment is described in detail.
On the one hand, as shown in figure 1, the embodiments of the invention provide a kind of fault monitoring system of overlength optical cable, including：The
One Brillouin light tim e- domain detection system 10, the second Brillouin light tim e- domain detection system 20, uplink optical fiber 30, downlink light
Fibre 40 and the multiple optical repeaters 50 being arranged in uplink optical fiber and each segmentation of downlink optical fiber, uplink optical fiber
With the both ends of downlink optical fiber respectively with the first Brillouin light tim e- domain detection system and the second Brillouin light tim e- domain detection system
Connection, the first Brillouin light tim e- domain detection system, the second Brillouin light tim e- domain detection system be used for emission detection pulsed light to
Row path optical fiber and downlink optical fiber, collect optical fibre channel in direct impulse light scattering the back of the body dissipate Brillouin's optical signal and
Analysis obtains the Monitoring Data of each point on optical fibre channel.
Using Brillouin light time domain reflection technology (BOTDR), Brillouin light tim e- domain detection system is attached with optical fiber,
Wherein optical fiber is that optical cable carries, and the direct impulse light that Brillouin light tim e- domain detection system is launched is injected into optical fiber, detects arteries and veins
Washing off can scatter in a fiber, include Rayleigh scattering, Raman scattering and Brillouin scattering, the monitoring system of the embodiment of the present invention
System only collects the back scattering Brillouin light signal in optical fiber, to obtain every bit along the optical fiber under a large amount of optical cable normal operations
Original temperature and strain data.Brillouin light tim e- domain detection network analysis original temperature and strain data, long-time is monitored into number
According to averaging, to obtain the Mean curve of the temperature of the optical cable and strain monitoring data.The overlength optical cable of the embodiment of the present invention
Fault monitoring system include the first Brillouin light tim e- domain detection system, the second Brillouin light tim e- domain detection system, uplink
Optical fiber, downlink optical fiber and the multiple optical repeaters being arranged in uplink optical fiber and each segmentation of downlink optical fiber,
Its is simple in construction, and the real time on-line monitoring of overlength optical cable is realized using Brillouin light tim e- domain detection system, is dissipated using the back of the body of collection
The original temperature and strain data that brillouin scattering signal obtains are so as to analyze the fault message of optical cable abnormity point, and based on Raman
The optical fiber temperature monitoring system of scattering is compared, and the system can measure original temperature and strain data simultaneously, improve fault message
Judge accuracy.
One as above-described embodiment is for example, as shown in Fig. 2 the first Brillouin light time domain of the embodiment of the present invention
Detecting system and/or the second Brillouin light tim e- domain detection system include：
Pulsed light emission module 11, for emission detection pulsed light to uplink optical fiber and downlink optical fiber；
Brillouin's measurement module 12, the back of the body for collecting direct impulse light scattering in optical fibre channel dissipate Brillouin's optical signal and obtained
Obtain Brillouin shift information；
Analysis module 13, the Monitoring Data of each point on optical fibre channel is obtained for analyzing Brillouin shift information, and generated
Monitoring curve, Monitoring Data are raw temperature data and strain data, and monitoring curve is that temperature Mean curve and strain average are bent
Line.
First Brillouin light tim e- domain detection system of the embodiment of the present invention and/or the second Brillouin light tim e- domain detection system are led to
Extra pulse light emission module injects direct impulse light in uplink optical fiber and downlink optical fiber, Brillouin's measurement module prison
The back of the body for surveying direct impulse light scattering in real-time collecting optical fibre channel dissipates Brillouin's optical signal acquisition Brillouin shift information, analyzes mould
Block analysis Brillouin shift information, obtained according to Brillouin shift information and the linear relationship of raw temperature data and strain data
The raw temperature data and strain data of each point on optical fibre channel, and calculate the temperature of the optical cable and the average of strain monitoring data
Curve, its computational methods can average for Monitoring Data.
Brillouin shift information and the linear relationship of raw temperature data and strain data are：
υ B (T, ε)=υ B (T0, ε 0)+CvT Δ T+Cv ε Δs ε
Wherein υ B (T, ε) are the Brillouin shifts being in the optical fiber under temperature T and strain stress；
υ B (T0, ε 0) are the initial frequency displacements of Brillouin being in the optical fiber under initial temperature T0 and initial strain ε 0；CvT is
The temperature coefficient of Brillouin shift；Cv ε are the coefficients of strain of Brillouin shift；Δ T and Δ ε be respectively relative to initial temperature and
The variable quantity of initial strain.
As above-described embodiment another for example, as shown in figure 3, the optical repeater 50 of the embodiment of the present invention includes
The first erbium-doped fiber amplifier of first erbium-doped fiber amplifier 51, the second erbium-doped fiber amplifier 52 and connection, the second er-doped light
The interface channel 53 of fiber amplifier, the first erbium-doped fiber amplifier, the second erbium-doped fiber amplifier are Unidirectional magnifier, are used for
Amplify direct impulse optical signal, the first erbium-doped fiber amplifier is arranged at uplink optical fiber, and the second erbium-doped fiber amplifier is set
It is placed in downlink optical fiber.The first erbium-doped fiber amplifier and the second erbium-doped fiber amplifier of optical repeater pass through interface channel
Connection, connecting path are one or more.
As above-described embodiment another for example, inside the first erbium-doped fiber amplifier 51 of the embodiment of the present invention
The (not shown) of the first isolator 511 is provided with, the second erbium-doped fiber amplifier 52 is internally provided with the second isolator 521 and (do not shown
Go out), the first isolator, the second isolator are used for the scattered light signal for isolating the direct impulse light inversely transmitted.
As above-described embodiment another for example, as shown in figure 4, the optical repeater of the embodiment of the present invention also includes
First photoswitch 54 and the second photoswitch 55, are arranged on interface channel, and the first photoswitch and the second photoswitch are connected, and are used for
Control the switching of different interface channels.Button 1 and 2 is first switch in figure, and button 3 and 4 is second switch, and first switch is set
Button 3 is arranged in button 1 and second switch and forms the first interface channel, and first switch is arranged at button 1 and second switch is set
It is placed in button 4 and forms the second interface channel, first switch is arranged at button 2 and second switch is arranged at button 4 and forms the 3rd company
Road is connected, first switch is arranged at button 2 and second switch is arranged at button 3 and forms the 4th interface channel.The embodiment of the present invention
Optical repeater switch mode of communicating by two photoswitches, improve fault monitoring system reality fault location and the essence of diagnosis
Degree.
As above-described embodiment another for example, as shown in figure 5, the embodiment of the present invention when the first photoswitch connect
The output end of first erbium-doped fiber amplifier, when the second photoswitch connects the input of the second erbium-doped fiber amplifier, first connects
Connect road to connect, form the first uplink test loop a, the first uplink test loop is from the first Brillouin light time domain
Detecting system returns to the first Brillouin light time domain by uplink optical fiber, the first erbium-doped fiber amplifier, downlink optical fiber
Detecting system；
As shown in fig. 6, when the first photoswitch connects the output end of the first erbium-doped fiber amplifier, the second photoswitch connection the
During the output end of two erbium-doped fiber amplifiers, the second interface channel is connected, and forms the second uplink test loop b, on second
Row path testing loop is by uplink optical fiber, the first Erbium-doped fiber amplifier from the first Brillouin light tim e- domain detection system
Device, the second erbium-doped fiber amplifier, downlink optical fiber return to the first Brillouin light tim e- domain detection system.
For testing uplink path fiber failure, when two photoswitches are arranged to 1 and 3, the back of the body in uplink optical fiber
Downlink optical fiber is introduced into Brillouin scattering, Brillouin light tim e- domain detection system is returned then along downlink, it is complete
In pairs backwards to the data processing and detection of Brillouin scattering, temperature and strain information are demodulated.Such a photoswitch, which is set, to be applicable
In relatively strong or testing length shorter (＜ 80km) the situation of test signal, erbium-doped fiber amplifier can be reduced to useful signal
Interference, step-down amplifier caused noise in itself.When two photoswitches are arranged to 1 and 4, in uplink optical fiber backwards
Brillouin scattering is introduced into downlink optical fiber, and by the second erbium-doped fiber amplifier to optical signal transmission and amplification, so
The first Brillouin light tim e- domain detection system is returned along downlink optical fiber afterwards, is completed at the data of Brillouin scattering
Reason and detection, demodulate temperature and strain information.Such a photoswitch, which is set, is applied to that test signal is weaker or testing length is longer
The situation of (＞ 80km), the intensity of effective scattered light signal can be further enhanced, avoid useful signal from being submerged in completely and make an uproar
Among sound.
As above-described embodiment another for example, as shown in fig. 7, the embodiment of the present invention when the first photoswitch connect
The input of first erbium-doped fiber amplifier, when the second photoswitch connects the output end of the second erbium-doped fiber amplifier, the 3rd connects
Connect road to connect, form the first downlink test loop c, the first downlink test loop is from the second Brillouin light time domain
Detecting system returns to the second Brillouin light time domain by downlink optical fiber, the first erbium-doped fiber amplifier, uplink optical fiber
Detecting system；
As shown in figure 8, when the first photoswitch connects the input of the first erbium-doped fiber amplifier, the second photoswitch connection the
During the input of two erbium-doped fiber amplifiers, the 4th interface channel is connected, and forms the second downlink test loop d, under second
Row path testing loop is by downlink optical fiber, the second Erbium-doped fiber amplifier from the second Brillouin light tim e- domain detection system
Device, the first erbium-doped fiber amplifier, uplink optical fiber return to the second Brillouin light tim e- domain detection system.
For testing downlink fiber failure, when two photoswitches are arranged to 2 and 4, the back of the body in downlink optical fiber
Uplink optical fiber is introduced into Brillouin scattering, then along uplink optical fiber, is amplified step by step, is returned in the second cloth
Deep optical time domain detecting system, complete, to the data processing and detection backwards to Brillouin scattering, to demodulate temperature and strain information.
Such a photoswitch, which is set, is applied to relatively strong or testing length shorter (＜ 80km) the situation of test signal, can reduce Er-doped fiber
Interference of the amplifier to useful signal, step-down amplifier caused noise in itself.When two photoswitches are arranged to 2 and 3, under
Uplink optical fiber is introduced into backwards to Brillouin scattering in row path optical fiber, and passes through the second, first Erbium-doped fiber amplifier
Device, to optical signal transmission and amplification, the second Brillouin light tim e- domain detection system, completion pair are returned to then along uplink optical fiber
Backwards to the data processing and detection of Brillouin scattering, temperature and strain information are demodulated.Such a photoswitch, which is set, to be applied to survey
If trial signal compared with or testing length longer (＞ 80km) situation, the intensity of effective scattered light signal can be further enhanced, kept away
Exempt from useful signal to be submerged among noise completely.
The fault monitoring system of the overlength optical cable of the embodiment of the present invention realizes the difference according to test environment by photoswitch,
Any switching laws are done to test loop, realize fault location and the diagnosis of higher precision.
On the other hand, as shown in figure 9, the embodiment of the present invention additionally provides a kind of fault monitoring method of overlength optical cable, bag
Include：
Step 100：Emission detection pulsed light is to uplink optical fiber and downlink optical fiber；
Step 200：The back of the body for collecting direct impulse light scattering in optical fibre channel dissipates Brillouin's optical signal acquisition Brillouin shift
Information；
Step 300：Analysis Brillouin shift information obtains the raw temperature data and strain data of each point on optical fibre channel；
Step 400：According to the raw temperature data of each point on optical fibre channel and strain data generation temperature Mean curve and
Strain Mean curve.
The fault monitoring method of the overlength optical cable of the embodiment of the present invention only collects the back scattering Brillouin light signal in optical fiber,
To obtain the original temperature and strain data of every bit along the optical fiber under a large amount of optical cable normal operations, by analyzing original temperature
And strain data, long-time Monitoring Data is averaged, to obtain the average of the temperature of the optical cable and strain monitoring data song
Line, improve overlength Cable's Fault accuracy of detection.
Described above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, on the premise of principle of the present invention is not departed from, some improvements and modifications can also be made, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (9)
- A kind of 1. fault monitoring system of overlength optical cable, it is characterised in that including：First Brillouin light tim e- domain detection system, Two Brillouin light tim e- domain detection systems, uplink optical fiber, downlink optical fiber and be arranged at the uplink optical fiber and The each multiple optical repeaters in segmentation of downlink optical fiber, the both ends of the uplink optical fiber and downlink optical fiber respectively with The first Brillouin light tim e- domain detection system connects with the second Brillouin light tim e- domain detection system, during first Brillouin light Domain detecting system, the second Brillouin light tim e- domain detection system are used for emission detection pulsed light to the uplink optical fiber and descending Path optical fiber, the scattered Brillouin's optical signal of the back of the body and analysis for collecting the direct impulse light scattering in the optical fibre channel obtain optical fiber The Monitoring Data of each point on path.
- A kind of 2. fault monitoring system of overlength optical cable according to claim 1, it is characterised in that first Brillouin Optical time domain detecting system and/or the second Brillouin light tim e- domain detection system include：Pulsed light emission module, for emission detection pulsed light to the uplink optical fiber and downlink optical fiber；Brillouin's measurement module, the back of the body for collecting direct impulse light scattering in the optical fibre channel dissipate Brillouin's optical signal and obtained Brillouin shift information；Analysis module, the Monitoring Data of each point on the optical fibre channel is obtained for analyzing the Brillouin shift information, and it is raw Into monitoring curve, the Monitoring Data is raw temperature data and strain data, the monitoring curve be temperature Mean curve and Strain Mean curve.
- A kind of 3. fault monitoring system of overlength optical cable according to claim 2, it is characterised in that the Brillouin shift Information and the linear relationship of raw temperature data and strain data are：υB(T, ε)=υB(T0,ε0)+CvTΔT+CvεΔεWherein υB(T, ε) is the Brillouin shift being in the optical fiber under temperature T and strain stress；υB(T0,ε0) it is to be in initial temperature T0With initial strain ε0Under optical fiber in the initial frequency displacement of Brillouin；CvTIt is the temperature coefficient of Brillouin shift；CvεIt is Brillouin The coefficient of strain of frequency displacement；Δ T and Δ ε is the variable quantity relative to initial temperature and initial strain respectively.
- 4. according to a kind of fault monitoring system of any described overlength optical cables of claim 1-3, it is characterised in that in the light Include the first erbium-doped fiber amplifier, the second erbium-doped fiber amplifier and connection first erbium-doped fiber amplifier, the after device The interface channel of two erbium-doped fiber amplifiers, first erbium-doped fiber amplifier, the second erbium-doped fiber amplifier are unidirectional Amplifier, for amplifying the direct impulse optical signal, first erbium-doped fiber amplifier is arranged at the uplink light Fibre, second erbium-doped fiber amplifier are arranged at the downlink optical fiber.
- A kind of 5. fault monitoring system of overlength optical cable according to claim 4, it is characterised in that the first er-doped light Fiber amplifier is internally provided with the first isolator, and second erbium-doped fiber amplifier is internally provided with the second isolator, described First isolator, the second isolator are used for the scattered light signal for isolating the direct impulse light inversely transmitted.
- 6. the fault monitoring system of a kind of overlength optical cable according to claim 4, it is characterised in that the optical repeater is also Including the first photoswitch and the second photoswitch, it is arranged on the interface channel, first photoswitch and the second photoswitch phase Connection, for controlling the switching of different interface channels.
- A kind of 7. fault monitoring system of overlength optical cable according to claim 6, it is characterised in thatWhen first photoswitch connects the output end of first erbium-doped fiber amplifier, described in the second photoswitch connection During the input of the second erbium-doped fiber amplifier, the first interface channel is connected, and forms the first uplink test loop, and described the One uplink test loop is to be put from the first Brillouin light tim e- domain detection system by uplink optical fiber, the first Er-doped fiber Big device, downlink optical fiber return to the first Brillouin light tim e- domain detection system；When first photoswitch connects the output end of first erbium-doped fiber amplifier, the second photoswitch connection connection During the output end of second erbium-doped fiber amplifier, the second interface channel is connected, and forms the second uplink test loop, institute It is by uplink optical fiber, the first er-doped light from the first Brillouin light tim e- domain detection system to state the second uplink test loop Fiber amplifier, the second erbium-doped fiber amplifier, downlink optical fiber return to the first Brillouin light tim e- domain detection system.
- A kind of 8. fault monitoring system of overlength optical cable according to claim 6, it is characterised in thatWhen first photoswitch connects the input of first erbium-doped fiber amplifier, described in the second photoswitch connection During the output end of the second erbium-doped fiber amplifier, the 3rd interface channel is connected, and forms the first downlink test loop, and described the One descending path testing loop is to be put from the second Brillouin light tim e- domain detection system by downlink optical fiber, the first Er-doped fiber Big device, uplink optical fiber return to the second Brillouin light tim e- domain detection system；When first photoswitch connects the input of first erbium-doped fiber amplifier, described in the second photoswitch connection During the input of the second erbium-doped fiber amplifier, the 4th interface channel is connected, and forms the second downlink test loop, and described the Two downlink test loops are to be put from the second Brillouin light tim e- domain detection system by downlink optical fiber, the second Er-doped fiber Big device, the first erbium-doped fiber amplifier, uplink optical fiber return to the second Brillouin light tim e- domain detection system.
- A kind of 9. fault monitoring method of overlength optical cable, it is characterised in that including：Emission detection pulsed light is to uplink optical fiber and downlink optical fiber；The back of the body for collecting direct impulse light scattering in optical fibre channel dissipates Brillouin's optical signal acquisition Brillouin shift information；Analyze the Brillouin shift information and obtain the raw temperature data and strain data of each point on optical fibre channel；According to the raw temperature data of each point on the optical fibre channel and strain data generation temperature Mean curve and strain average Curve.
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| CN112985773A (en) * | 2021-02-07 | 2021-06-18 | 中国电力科学研究院有限公司 | OPGW state detection method, system and storage medium based on BOTDR and OTDR |
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| CN110441651A (en) * | 2019-07-25 | 2019-11-12 | 武汉钜风科技有限公司 | A kind of transmission line status detection method and system based on OPGW |
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