CN110518971A - It is a kind of to have relaying submarine optical fiber cable disturbance monitoring system based on what is sampled under water - Google Patents
It is a kind of to have relaying submarine optical fiber cable disturbance monitoring system based on what is sampled under water Download PDFInfo
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- CN110518971A CN110518971A CN201910923291.4A CN201910923291A CN110518971A CN 110518971 A CN110518971 A CN 110518971A CN 201910923291 A CN201910923291 A CN 201910923291A CN 110518971 A CN110518971 A CN 110518971A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 164
- 238000012544 monitoring process Methods 0.000 title claims abstract description 103
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 230000003287 optical effect Effects 0.000 claims abstract description 145
- 239000000835 fiber Substances 0.000 claims abstract description 99
- 238000005070 sampling Methods 0.000 claims abstract description 42
- 238000012546 transfer Methods 0.000 claims abstract description 39
- 238000001514 detection method Methods 0.000 claims abstract description 33
- 238000004891 communication Methods 0.000 claims description 31
- 230000005540 biological transmission Effects 0.000 claims description 26
- 239000000523 sample Substances 0.000 claims description 22
- 235000008694 Humulus lupulus Nutrition 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 230000035559 beat frequency Effects 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000003786 synthesis reaction Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 7
- 238000002168 optical frequency-domain reflectometry Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000000253 optical time-domain reflectometry Methods 0.000 description 6
- 230000006378 damage Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
- H04B10/0771—Fault location on the transmission path
Abstract
The present invention is a kind of based on the submarine optical fiber cable disturbance monitoring system that relays that has sampled under water, and chirped detection optical signal connects the downlink transfer optical fiber of this hop through downlink relay amplifier, fibre optic interferometer.Detection optical signal generates rear relevant in fibre optic interferometer and local optical signal to Rayleigh scattering signal in each hop downlink transfer optical fiber, fibre optic interferometer exports the disturbance monitoring signal of the hop submarine optical fiber cable optical fiber, access the sampling module of this hop, the digital optical signal of this section of disturbance monitoring signal of gained occupies different DWDM wavelength respectively, uplink optical fiber and/or downlink transfer optical fiber are multiplexed by multiplexing equipment, it is transmitted to bank base demodulated equipment, demodulate disturbance monitoring signal, each section of submarine optical fiber cable safe condition of early warning.This programme be based on OFDR technology, realize 1000km or more long span have relaying submarine optical fiber cable span centre after disturbance monitoring.
Description
Technical field
The present invention relates to a kind of distributed optical fiber sensing systems, and in particular to it is a kind of for long span physical security monitoring
There is electricity relaying submarine optical fiber cable disturbance monitoring system.
Background technique
Submarine optical fiber cable is the communications cable for being laid on seabed, is the important of Internet and other underwater optical-fiber networks
Component part.But submarine optical fiber cable is easy to be damaged, such as earthquake, ship anchor and fishing net are possible to destroy submarine optical fiber cable, even
It there may also be artificial destruction.There is each section of relaying submarine optical fiber cable to be all connected to a relay amplifier, at present with compensated optical signal
Transmission loss on this section of optical fiber, by optical signal amplification to original power level.Such submarine optical fiber cable for having relaying is generally adopted
With COTDR (the relevant detection optical time domain reflectometer of Coherent Detection OTDR, OTDR Optical Time Domain
Reflectometer, optical time domain reflectometer) health detection of realizing optical fiber link, have and checks and respectively put on entire optical fiber link
Whether the signal gain of big device, optical cable are broken and to functions such as fault point locatings.
But COTDR can not achieve the optical cable disturbance monitoring function of similar φ-OTDR, also just can not be pre- in real time to destruction
It is alert, technical guarantee can not be provided to prevent destruction.The optical cable disturbance monitoring technology that current land uses, maximum are only supported
The monitoring range of about 100km, double-end monitor are also only capable of reaching 200km.It is unable to satisfy the overlength span of submarine optical fiber cable 200km or more
Disturbance monitoring.
Probe beam deflation instrument OFDR is a kind of high-resolution optical fiber measurement technology gradually to grow up in generation nineteen ninety, with
Unlike common optical time domain reflectometer OTDR, OTDR is by emitting time domain impulsive signals, detection pulse time-of-flight, utilizing
Pulse time-of-flight and the directly proportional relationship of target range carry out diagnostic optical fiber measurement, and OFDR passes through transmitting continuous frequency modulation laser
Signal, detection target reflecting light are carried out to the difference frequency of local oscillator light, using the directly proportional relationship of difference frequency and target range
Diagnostic optical fiber measurement.OFDR ratio OTDR high sensitivity, high resolution, but the frequency modulation light source technology difficulty of OFDR is big, at high cost, disturbs
The phase demodulating difficulty of dynamic signal is big, therefore has not yet to see the report for submarine optical fiber cable disturbance monitoring.
Summary of the invention
There is relaying submarine optical fiber cable disturbance monitoring system based on what is sampled under water the object of the present invention is to provide a kind of, is based on
OFDR technology, chirped detection optical signal access downlink transfer optical fiber, and each section of downlink transfer optical fiber first connects a relaying
Amplifier, then incoming fiber optic interferometer, then connects the downlink transfer optical fiber of this section.Optical signal is detected in each hop downlink
The backward Rayleigh scattering signal that transmission fiber generates is relevant in fibre optic interferometer and local optical signal, and fibre optic interferometer exports in this
After the disturbance monitoring signal of section submarine optical fiber cable optical fiber, the sampling module of this hop, each hop seabed fiber of gained are accessed
The digital optical signal of disturbance monitoring signal occupy different DWDM respectively (intensive light wave be multiplexed Dense Wavelength
Division Multiplexing) wavelength, uplink optical fiber and/or downlink transfer optical fiber are multiplexed by multiplexing equipment,
It is transmitted to bank base demodulated equipment, demodulates disturbance monitoring signal, each section of submarine optical fiber cable safe condition of early warning.This programme overcomes existing light
The shortcomings that cable disturbance monitoring technology maximum only supports the monitoring range of about 100km realizes that the long span of 1000km or more has relaying
Submarine optical fiber cable span centre after disturbance monitoring.
The present invention design based on sample under water have relaying submarine optical fiber cable disturbance monitoring system, including probe source, in
After amplifier, fibre optic interferometer and demodulated equipment, probe source connects the downlink transfer optical fiber of submarine optical fiber cable detection optical signal, institute
It states each section of downlink transfer optical fiber and first connects a downlink relay amplifier, the every one section of optical fiber of transmission of detection optical signal generates certain
Transmission loss, relay amplifier will detect optical signal amplification to original power level, to realize long distance transmission；Under two adjacent
Fiber lengths between row relay amplifier are less than or equal to 100km, referred to as hop；Each hop downlink transfer optical fiber
Fibre optic interferometer is connected to after downlink relay amplifier, then with the downlink transfer light of the feeler arm as this section of fibre optic interferometer
Fibre connection.This system further includes sampling module and multiplexing equipment, and detection optical signal is generated in some hop downlink transfer optical fiber
Backward Rayleigh scattering signal, relevant with the local optical signal of fibre optic interferometer, generate disturbing for the hop submarine optical fiber cable optical fiber
Dynamic monitoring signals, the sampling module of this hop are accessed through this section of filter, sampling module is to defeated after disturbance monitoring signal sampling
Its digital optical signal out accesses uplink and downlink multiplexing equipment, the digital optical signal with the disturbance monitoring signal of other hops
It is multiplexed respectively in uplink and downlink transmission fiber, i.e., enters uplink optical fiber through uplink relay amplifier, be transmitted to the demodulation of local terminal
Equipment；Or enter downlink transfer optical fiber through downlink relay amplifier, it is transmitted to the demodulated equipment of opposite end.
The fibre optic interferometer be include 2 × 2 fiber coupler and the Michelson fiber-optic interferometer of fiber reflector.
The 1st port that optical signal accesses 2 × 2 fiber couplers is detected, is divided into 2 beams, wherein a branch of the 3rd end by 2 × 2 fiber couplers
Mouth output, access downlink transfer optical fiber continue traveling downwardly transmission, and generated backward Rayleigh scattering signal returns to 2 by the 3rd port
× 2 fiber couplers；4th port of 2 × 2 fiber coupler of detection optical signals for another beam that 2 × 2 fiber couplers separate
Output reaches fiber reflector, is reflected off back 2 × 2 fiber couplers as local optical signal, local optical signal with it is auspicious backward
Sharp scattered signal is relevant, and interference signal is exported the disturbance monitoring as this section of submarine optical fiber cable by the 2nd port of 2 × 2 fiber coupler
Signal.
Or the fibre optic interferometer is MZ fibre optic interferometer (Mach-Zehnder interferometer, Mach Zehnder interference
Instrument), including optical fiber splitter, optical fiber circulator and 3dB fiber coupler, the splitting ratio of optical fiber splitter are (5/95)~(50/
50), detection optical signal in optical fiber splitter is divided into 2 tunnels, wherein the of the optical signal incoming fiber optic circulator of big splitting ratio all the way
Single port is exported by fiber annular second port later, and access continues traveling downwardly transmission along downlink transfer optical fiber；Optical fiber splitter is defeated
The optical signal of small splitting ratio out accesses 3dB fiber coupler as local optical signal；What is generated on downlink transfer optical fiber is backward
Rayleigh signal returns to optical fiber circulator second port, and is terminated by the third port of optical fiber circulator into the 3dB optical fiber coupling
Clutch and local optical signal are relevant, and the interference signal of 3dB fiber coupler output is this section of submarine optical fiber cable disturbance monitoring signal.
The probe source is Single wavelength narrow linewidth CW with frequency modulation light source, and the detection optical signal generated is in optical fiber
Submarine optical fiber cable of the coherence length greater than 2 times relays segment length, and the maximum beat frequency rate that tuning range generates is less than sampling module most
The 1/2 of big sample frequency, to meet sampling request.
The digital optical signal of the disturbance monitoring signal of the sampling module output of each hop occupies different DWDM waves respectively
Long, the hop submarine optical fiber cable disturbance monitoring signal of the fibre optic interferometer output of each hop accesses the sampling through wave filter
Module exports the digital optical signal of this hop submarine optical fiber cable disturbance monitoring signal.
Uplink relay amplifier, the downlink relay amplifier, light of the probe source, demodulated equipment and the first hop
Fine interferometer, sampling module and multiplexing equipment are local terminal bank base equipment.Opposite end bank base equipment includes the demodulated equipment of opposite end.
Another program is other Communication rays letter of the detection optical signal that the probe source issues and the transmitting of bank base optical transmitter and receiver
Wavelength division multiplexer number is accessed, wavelength-division multiplex is transmitted in the same root downlink optical fiber of submarine optical fiber cable, the disturbance of sampling module output
The digital optical signal of monitoring signals accesses the downlink optical add/drop multiplexer of this hop, the disturbance monitoring signal with other hops
Digital optical signal and other signals of communication be multiplexed the demodulated equipment that opposite end is transmitted to downlink transfer optical fiber；Meanwhile it sampling
The digital optical signal of the disturbance monitoring signal of module output accesses the uplink optical add/drop multiplexer and other hops of this hop
Disturbance monitoring signal digital optical signal and other signals of communication be multiplexed the demodulation that local terminal is back to uplink transmission fiber
Equipment.
Another aspect is other Communication rays letter of the detection optical signal that the probe source issues and the transmitting of bank base optical transmitter and receiver
Wavelength division multiplexer number is accessed, the same root downlink optical fiber being multiplexed in submarine optical fiber cable transmits, some hop is furnished with underwater node
Communication module is connect with underwater equipment, as underwater node, and the digital optical signal of the disturbance monitoring signal of sampling module output connects
Enter underwater node communication module and other signals of communication of the underwater equipment of the underwater node are time-multiplexed, underwater node is logical
Letter module connects the downlink optical add/drop multiplexer of this hop, output signal and other communicating light signal wavelength-division multiplex to downlink
Transmission fiber is transmitted to the optical transmitter and receiver of opposite end, and disturbance monitoring signal solution is time-multiplexed by the optical transmitter and receiver of opposite end, is re-fed into opposite end
Demodulated equipment；Meanwhile underwater node communication module connects the uplink optical add/drop multiplexer of this hop, output signal with it is other
Communicating light signal wavelength-division multiplex is back to the optical transmitter and receiver of local terminal, the optical transmitter and receiver of local terminal believes disturbance monitoring to uplink transmission fiber
Number solution time division multiplexing, be re-fed into local terminal demodulated equipment.
The disturbance monitoring branch of this system increase branch's sea light cable.Trunk submarine optical fiber cable is in some underwater node connection 1 × 2
Optical fiber splitter, detection optical signal are divided into 2 tunnels, and the downlink transfer optical fiber of a curb trunk submarine optical fiber cable continues traveling downwardly transmission, separately
Branch cable fibre optic interferometer is connected all the way, and detection optical signal continues traveling downwardly after branch cable fibre optic interferometer along branch's sea light cable
Transmission, what is generated on branch's sea light cable is rear relevant in branch cable fibre optic interferometer and its local optical signal to Rayleigh scattering signal
The disturbance monitoring signal of this section of branch's sea light cable is obtained, the disturbance monitoring signal of branch's sea light cable is accessed through branch cable filter
Branch cable sampling module.The digital optical signal and branch cable of the disturbance monitoring signal of sampling module output on trunk sea light cable are adopted
The digital optical signal of branch's sea light cable disturbance monitoring signal of egf block output accesses underwater node communication module convergence data
And after being time-multiplexed, the digital optical signal of underwater node communication module synthesis accesses the downlink optical add/drop multiplexer of this hop
The uplink optical add/drop multiplexer of device and this hop.
Compared with prior art, the present invention is based on what is sampled under water relaying submarine optical fiber cable disturbance monitoring system and operation side
The beneficial effect of method is: 1, being based on OFDR technology, overcoming submarine optical fiber cable disturbance monitoring system cannot be through submerged repeater
The detection range of submarine optical fiber cable disturbance monitoring system is increased to thousands of miles by problem within 100km, meets long span sea
The requirement of back light cable physical security real-time monitoring；2, the disturbance monitoring of branch's submarine optical fiber cable is supported.
Detailed description of the invention
Fig. 1 is to have relaying 1 structural schematic diagram of submarine optical fiber cable disturbance monitoring system embodiment based on what is sampled under water；
Fig. 2 is based on the Michelson optical fiber for having relaying submarine optical fiber cable disturbance monitoring system embodiment 1 sampled under water
Interferometer structure schematic diagram；
Fig. 3 is based on the MZ fibre optic interferometer for having relaying submarine optical fiber cable disturbance monitoring system embodiment 2 sampled under water
Structural schematic diagram；
Fig. 4 is to have relaying 2 structural schematic diagram of submarine optical fiber cable disturbance monitoring system embodiment based on what is sampled under water；
Fig. 5 is to have relaying 3 structural schematic diagram of submarine optical fiber cable disturbance monitoring system embodiment based on what is sampled under water；
Fig. 6 is to have relaying 4 structural schematic diagram of submarine optical fiber cable disturbance monitoring system embodiment based on what is sampled under water.
Specific embodiment
There is relaying submarine optical fiber cable disturbance monitoring system embodiment 1 based on what is sampled under water
There is relaying submarine optical fiber cable disturbance monitoring system embodiment 1 based on what is sampled under water, Fig. 1 show this example in some
After the demodulated equipment of section, local terminal bank base equipment and opposite end.Probe source first connects a downlink relay amplifier, the downlink in figure
EDFA, the downlink relay amplifier downlink EDFA's of each hop downlink transfer optical fiber is followed by fibre optic interferometer, then with work
For the downlink transfer optical fiber connection of the feeler arm of this section of fibre optic interferometer.Light between two contiguous downstream relay amplifiers of this example
Fine length is 60~100km, referred to as hop.
Detection optical signal generates rear to Rayleigh scattering signal and fibre optic interferometer in some hop downlink transfer optical fiber
Local optical signal it is relevant, generate the disturbance monitoring signal of the hop submarine optical fiber cable optical fiber, accessed in this through this section of filter
After the sampling module of section, sampling module is set to its digital optical signal, access downlink multiplexing is exported after disturbance monitoring signal sampling
Standby --- downlink optical add/drop multiplexer downlink OADM and uplink multiplexing equipment --- uplink optical add/drop multiplexer upgoing O ADM, with it
The digital optical signal of the disturbance monitoring signal of its hop is multiplexed respectively in uplink and downlink transmission fiber, i.e., amplifies through uplink relay
Device uplink EDFA enters uplink optical fiber, is transmitted to the demodulated equipment of local terminal；Or through downlink relay amplifier downlink EDFA
Into downlink transfer optical fiber, it is transmitted to the demodulated equipment of opposite end.
This example fibre optic interferometer be include 2 × 2 fiber coupler and the Michelson fiber-optic interferometer of fiber reflector,
Its structure is as shown in Figure 2.The 1st port that optical signal accesses 2 × 2 fiber couplers is detected, is divided into 2 beams, wherein a branch of by 2 × 2
The 3rd port access downlink transfer optical fiber of fiber coupler continues traveling downwardly transmission, and generated backward Rayleigh scattering signal is by this
3rd port returns to 2 × 2 fiber couplers；2 × 2 optical fiber coupling of detection optical signals for another beam that 2 × 2 fiber couplers separate
The 4th port output of clutch reaches fiber reflector, is reflected off back 2 × 2 fiber couplers as local optical signal, local light
Signal and backward Rayleigh scattering signal are relevant, and interference signal is exported by the 2nd port of 2 × 2 fiber coupler, as this section of Submarine Optical
The disturbance monitoring signal of cable.
This example probe source is Single wavelength narrow linewidth CW with frequency modulation light source, and the detection optical signal generated is in optical fiber
Submarine optical fiber cable of the coherence length greater than 2 times relays segment length, and the maximum beat frequency rate that tuning range generates is less than sampling module most
The 1/2 of big sample frequency.
The digital optical signal of the disturbance monitoring signal of the sampling module output of each hop occupies different wave length respectively, respectively
The hop submarine optical fiber cable disturbance monitoring signal of the fibre optic interferometer output of hop accesses the sampling module through wave filter,
Export the digital optical signal of this hop submarine optical fiber cable disturbance monitoring signal.
The uplink relay amplifier uplink EDFA of this example probe source, demodulated equipment and the first hop, downlink relay
Amplifier downlink EDFA, fibre optic interferometer, sampling module and downlink multiplexing equipment downlink optical add/drop multiplexer downlink OADM are
Local terminal bank base equipment.Opposite end bank base equipment includes the demodulated equipment of opposite end.
There is relaying submarine optical fiber cable disturbance monitoring system embodiment 2 based on what is sampled under water
Fig. 4 show the demodulated equipment of some hop of this example, local terminal bank base equipment and opposite end.This example primary structure with
Embodiment 1 is identical, and the detection optical signal and other communicating light signals that only probe source issues access wavelength division multiplexer, and wavelength-division is multiple
Same root downlink optical fiber for submarine optical fiber cable transmits, and the digital optical signal of the disturbance monitoring signal of sampling module output accesses this
The digital optical signal and bank of the disturbance monitoring signal of the downlink optical add/drop multiplexer downlink OADM and other hops of hop
Other signals of communication of base optical transmitter and receiver transmitting are multiplexed the demodulated equipment that opposite end is transmitted to downlink transfer optical fiber；Meanwhile sampling mould
The digital optical signal of the disturbance monitoring signal of block output access the uplink optical add/drop multiplexer upgoing O ADM of this hop with it is other
The digital optical signal and other signals of communication of the disturbance monitoring signal of hop are multiplexed to uplink transmission fiber, are back to local terminal
Demodulated equipment.
This example fibre optic interferometer is MZ fibre optic interferometer, as shown in figure 3, including optical fiber splitter, optical fiber circulator and 3dB
Fiber coupler, the splitting ratio of optical fiber splitter are 10/90, detect optical signal in optical fiber splitter and are divided into 2 tunnels, wherein big all the way
The first port of the optical signal incoming fiber optic circulator of splitting ratio, is exported by fiber annular second port later, and access downlink passes
It loses fibre and continues traveling downwardly transmission；The optical signal of the small splitting ratio of optical fiber splitter output accesses 3dB optical fiber as local optical signal
Coupler；The backward Rayleigh signal generated on downlink transfer optical fiber returns to optical fiber circulator second port, and by fiber annular
The third port of device terminates, the interference letter of 3dB fiber coupler output relevant into the 3dB fiber coupler and local optical signal
Number be this section of submarine optical fiber cable disturbance monitoring signal.
There is relaying submarine optical fiber cable disturbance monitoring system embodiment 3 based on what is sampled under water
Fig. 5 show some hop and local terminal bank base equipment of this example.This example primary structure is same as Example 2, this
Other communicating light signals of detection optical signal and the transmitting of bank base optical transmitter and receiver that example probe source issues access wavelength division multiplexer, wavelength-division
It is multiplexed the same root downlink optical fiber transmission in submarine optical fiber cable, the digital optical signal access of the disturbance monitoring signal of sampling module output
Other signals of communication of underwater node communication module and underwater equipment are time-multiplexed, in underwater node communication module connection originally
After the downlink optical add/drop multiplexer downlink OADM of section, output signal and other communicating light signal wavelength-division multiplex to downlink transfer light
Fibre is transmitted to the optical transmitter and receiver of opposite end, and disturbance monitoring signal solution is time-multiplexed by the optical transmitter and receiver of opposite end, and the demodulation for being re-fed into opposite end is set
It is standby；Meanwhile underwater node communication module connects the uplink optical add/drop multiplexer upgoing O ADM of this hop, output signal and its
Its communicating light signal wavelength-division multiplex is back to the optical transmitter and receiver of local terminal to uplink transmission fiber, and the optical transmitter and receiver of local terminal is by disturbance monitoring
Signal solution time division multiplexing, is re-fed into local terminal demodulated equipment.
There is relaying submarine optical fiber cable disturbance monitoring system embodiment 4 based on what is sampled under water
Fig. 6 show this example some hop and underwater node communication module.This example is increased on the basis of embodiment 3
The disturbance monitoring branch of bonus point Zhi Haiguang cable.The underwater node of some of trunk submarine optical fiber cable connects 1 × 2 optical fiber splitter, detection
Optical signal is divided into 2 tunnels, and the downlink transfer optical fiber of a curb trunk submarine optical fiber cable continues traveling downwardly transmission, and another way connects branch cable light
Fine interferometer, detection optical signal continues traveling downwardly transmission along branch's sea light cable after branch cable fibre optic interferometer, in branch's sea light
The backward Rayleigh scattering signal generated on cable is concerned in branch cable fibre optic interferometer and its local optical signal obtains branch's sea light
The disturbance monitoring signal of the disturbance monitoring signal of this section of cable, branch's sea light cable samples mould through branch cable filter access tributary cable
Block.The underwater node for connecting branch's sea light cable is furnished with underwater node communication module, the sampling module output on trunk sea light cable
The digital light of branch's sea light cable disturbance monitoring signal of digital optical signal and branch cable the sampling module output of disturbance monitoring signal
After signal accesses underwater node communication module convergence data and is time-multiplexed, the number of underwater node communication module synthesis
Optical signal accesses the downlink optical add/drop multiplexer OADM of this hop and the uplink optical add/drop multiplexer upgoing O ADM of this hop.
Above-described embodiment is only further described the purpose of the present invention, technical scheme and beneficial effects specific
A example, present invention is not limited to this.All any modifications made within the scope of disclosure of the invention, change equivalent replacement
Into etc., it is all included in the scope of protection of the present invention.
Claims (7)
1. a kind of have relaying submarine optical fiber cable disturbance monitoring system, including probe source, relay amplifier, light based on what is sampled under water
Fine interferometer and demodulated equipment, probe source connect the downlink transfer optical fiber of submarine optical fiber cable detection optical signal, the downlink transfer
Each section of optical fiber first connects a relay amplifier；Fiber lengths between two relay amplifiers are less than or equal to 100km, referred to as
Hop；It is connected to fibre optic interferometer after the relay amplifier of each hop downlink transfer optical fiber, then and as this Duan Guang
The downlink transfer optical fiber of the feeler arm of fine interferometer connects；It is characterized by:
The system also includes sampling module and multiplexing equipment, detect what optical signal was generated in some hop downlink transfer optical fiber
The local optical signal of backward Rayleigh scattering signal and fibre optic interferometer is relevant, generates the disturbance of the hop submarine optical fiber cable optical fiber
Monitoring signals, access the sampling module of this hop through this section of filter, and sampling module after disturbance monitoring signal sampling to exporting
Its digital optical signal, access and multiplexing device, with the digital optical signal of the disturbance monitoring signal of other hops be multiplexed respectively in it is upper,
Downlink transfer optical fiber enters uplink optical fiber through uplink relay amplifier, be transmitted to the optical transmitter and receiver of local terminal, and demultiplexing is followed by
Enter demodulated equipment；Or enter downlink transfer optical fiber through downlink relay amplifier, it is transmitted to the optical transmitter and receiver of opposite end, demultiplexing is followed by
Enter the demodulated equipment of opposite end.
2. according to claim 1 have relaying submarine optical fiber cable disturbance monitoring system based on what is sampled under water, it is characterised in that:
The fibre optic interferometer be include 2 × 2 fiber coupler and the Michelson fiber-optic interferometer of fiber reflector；Detection
Optical signal accesses the 1st port of 2 × 2 fiber couplers, is divided into 2 beams, wherein a branch of connect by the 3rd port of 2 × 2 fiber couplers
Enter downlink transfer optical fiber and continue traveling downwardly transmission, generated backward Rayleigh scattering signal returns to 2 × 2 optical fiber couplings by the 3rd port
Clutch；4th port of 2 × 2 fiber coupler of detection optical signals for another beam that 2 × 2 fiber couplers separate, which exports, to be reached
Fiber reflector is reflected off back 2 × 2 fiber couplers and believes as local optical signal, local optical signal and backward Rayleigh scattering
Number relevant, interference signal is exported by the 2nd port of 2 × 2 fiber coupler, the disturbance monitoring signal as this section of submarine optical fiber cable；
Or the fibre optic interferometer is MZ fibre optic interferometer, including optical fiber splitter, optical fiber circulator and 3dB fiber coupling
Device, the splitting ratio of optical fiber splitter are (5/95)~(50/50), detect optical signal in optical fiber splitter and are divided into 2 tunnels, wherein all the way
The first port of the optical signal incoming fiber optic circulator of big splitting ratio, is exported by fiber annular second port later, accesses downlink
Transmission fiber continues traveling downwardly transmission；The optical signal of the small splitting ratio of optical fiber splitter output accesses 3dB light as local optical signal
Fine coupler；The backward Rayleigh signal generated on downlink transfer optical fiber returns to optical fiber circulator second port, and by fiber optic loop
The third port of shape device terminates, the interference of 3dB fiber coupler output relevant into the 3dB fiber coupler and local optical signal
Signal is this section of submarine optical fiber cable disturbance monitoring signal.
3. according to claim 1 have relaying submarine optical fiber cable disturbance monitoring system based on what is sampled under water, it is characterised in that:
The probe source is Single wavelength narrow linewidth CW with frequency modulation light source, and the detection optical signal generated is relevant in optical fiber
Submarine optical fiber cable of the length greater than 2 times relays segment length, and the maximum beat frequency rate that tuning range generates is less than sampling module maximum and adopts
The 1/2 of sample frequency；
The digital optical signal of the disturbance monitoring signal of the sampling module output of each hop occupies different DWDM wavelength respectively, respectively
The hop submarine optical fiber cable disturbance monitoring signal of the fibre optic interferometer output of hop accesses the sampling module through wave filter,
Export the digital optical signal of this hop submarine optical fiber cable disturbance monitoring signal.
4. according to claim 1 have relaying submarine optical fiber cable disturbance monitoring system based on what is sampled under water, it is characterised in that:
Uplink relay amplifier, downlink relay amplifier, the optical fiber of the probe source, demodulated equipment and the first hop are dry
Interferometer, sampling module and multiplexing equipment are local terminal bank base equipment；Opposite end bank base equipment includes the demodulated equipment of opposite end.
5. according to any one of claim 1 to 4 have relaying submarine optical fiber cable disturbance monitoring system based on what is sampled under water,
It is characterized by:
It is multiple that the other communicating light signals for detection optical signal and bank base the optical transmitter and receiver transmitting that the probe source issues access wavelength-division
With device, wavelength-division multiplex is transmitted in the same root downlink optical fiber of submarine optical fiber cable, the number of the disturbance monitoring signal of sampling module output
Optical signal accesses the downlink optical add/drop multiplexer of this hop and other signals of communication are multiplexed to downlink transfer optical fiber, is transmitted to pair
The demodulated equipment at end；Meanwhile the digital optical signal of the disturbance monitoring signal of sampling module output accesses the uplink linght of this hop
Add-drop multiplexer and other signals of communication are multiplexed the demodulated equipment that local terminal is back to uplink transmission fiber.
6. according to any one of claim 1 to 4 have relaying submarine optical fiber cable disturbance monitoring system based on what is sampled under water,
It is characterized by:
Other communicating light signal wavelength-division multiplex of detection optical signal and the transmitting of bank base optical transmitter and receiver that the probe source issues are in sea
The same root downlink optical fiber of back light cable transmits, some hop is connect equipped with underwater node communication module, with underwater equipment, as
The digital optical signal of underwater node, the disturbance monitoring signal of sampling module output accesses underwater node communication module and the underwater section
Other signals of communication of point underwater equipment are time-multiplexed, and the downlink light point that underwater node communication module connects this hop is inserted
Multiplexer, output signal and other communicating light signal wavelength-division multiplex to downlink transfer optical fiber, are transmitted to the optical transmitter and receiver of opposite end, right
Disturbance monitoring signal solution is time-multiplexed by the optical transmitter and receiver at end, is re-fed into the demodulated equipment of opposite end；Meanwhile underwater node communication module
The uplink optical add/drop multiplexer of this hop, output signal and other communicating light signal wavelength-division multiplex are connected to uplink light
Fibre is back to the optical transmitter and receiver of local terminal, and disturbance monitoring signal solution is time-multiplexed by the optical transmitter and receiver of local terminal, is re-fed into local terminal demodulation and sets
It is standby.
7. according to any one of claim 1 to 4 have relaying submarine optical fiber cable disturbance monitoring system based on what is sampled under water,
It is characterized by:
The disturbance monitoring branch of this system increase branch's sea light cable；Some hop is equipped with underwater node communication module and under water
Equipment connection, as underwater node, the underwater node of some of trunk submarine optical fiber cable connect 1 × 2 optical fiber splitter, detect optical signal
It is divided into 2 tunnels, the downlink transfer optical fiber of a curb trunk submarine optical fiber cable continues traveling downwardly transmission, and another way connects branch cable fiber optic interferometric
Instrument, detection optical signal continue traveling downwardly transmission along branch's sea light cable after branch cable fibre optic interferometer, produce on branch's sea light cable
Raw backward Rayleigh scattering signal obtains this section of branch's sea light cable branch cable fibre optic interferometer and its local optical signal are relevant
Disturbance monitoring signal, the disturbance monitoring signal of branch's sea light cable is through branch cable filter access tributary cable sampling module；Trunk
The digital optical signal of the disturbance monitoring signal of sampling module output on sea light cable and the branch sea of branch cable sampling module output
After the digital optical signal of optical cable disturbance monitoring signal accesses underwater node communication module convergence data and is time-multiplexed, water
The digital optical signal of lower node communication module synthesis accesses the downlink optical add/drop multiplexer and this underwater node of this underwater node
Uplink optical add/drop multiplexer.
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