CN207197545U - A kind of optical fiber multiplexing system for POTDR distributing optical fiber sensings - Google Patents
A kind of optical fiber multiplexing system for POTDR distributing optical fiber sensings Download PDFInfo
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- CN207197545U CN207197545U CN201720570668.9U CN201720570668U CN207197545U CN 207197545 U CN207197545 U CN 207197545U CN 201720570668 U CN201720570668 U CN 201720570668U CN 207197545 U CN207197545 U CN 207197545U
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Abstract
The utility model discloses the optical fiber multiplexing system for POTDR distributing optical fiber sensings, including sense light waveform generator and optical fiber multiplexing unit, sense light waveform generator connects three optical fiber multiplexing units simultaneously, and each optical fiber multiplexing unit includes：First and second communication optical module, first and second smooth multiplexer/demultiplexer, sense light source, optical circulator, reflector, polarization state analyzer, sense light spy group, transducing signal filter and amplification module and POTDR distributed sensing signal detection modules, first and second optical communications module are connected with first and second smooth multiplexer/demultiplexer respectively, and first and second smooth multiplexer/demultiplexer is connected, sense light waveform generator connection sensing light source, light source connection optical circulator is sensed, optical circulator also connects the first smooth multiplexer/demultiplexer and polarization state analyzer, the second smooth multiplexer/demultiplexer connection reflector simultaneously.The utility model realizes optical fiber communication function and optical fiber polarisation sensing function simultaneously in same telecommunication optical fiber.
Description
Technical field
The utility model belongs to sensory field of optic fibre, and be used for fiber optic communication more particularly, to one kind passes with optical fiber polarisation
The optical fiber multiplexing system of sense.
Background technology
Light wave is a kind of shear wave, has polarization characteristic.The polarization state of optical fiber inner light beam is to extraneous deformation, vibration, temperature
It is more sensitive Deng change.By the change of detection fiber inner light beam polarization state, the external worlds such as deformation, vibration, temperature can be determined
The change of environment.
The polarization sense of optical fiber can be not only used for the intrusion detection in all types of safety precaution regions, it is also possible to communication
Optical cable, power cable Polarization-Sensitive amount detection.But communications optical cable is very valuable with fiber resource in power cable.
Need to borrow sensing applications fibre core to realize the sensing number of sensing node in sensing network in networking in optical fiber polarisation sensor-based system
According to transmission to collect, this needs to take valuable fiber resource.It is saved if not being separately provided the optical fiber of sensing applications
The idle fibre core of optical fiber can be used for carrying more communication tasks.
The Chinese patent application of Application No. 201310455498.6《With communication and sensing function fiber unit and its
Manufacture method》Middle proposition is " fiber unit ", and the unit includes " a tightly packaged fiber sensing unit and commutation in center
Some communication precoated fibers for being stranded on tightly packaged fiber sensing unit and outside the fiber unit protection pipe of pine set ".This
Kind of fiber unit is substantially the optical cable being made up of more different types of optical fiber, including the optical fiber with communication function and with
The optical fiber of sensing function, so as to realize optical fiber cable while there is communication and sensing function.
Application No. 201510816255.X Chinese patent application discloses a kind of optical fiber grating sensing and fiber optic communication
Integral system, it can realize communication and detection integral application on a fiber optic network, and it is needed in telecommunication optical fiber link
Upper laying grating sensor, insertion loss can be caused on the communication link by laying grating sensor.
The Chinese patent application of Application No. 200580042657.3 discloses《Reflective optical system, optical multiplexer/demultiplexer and light
System》, where it is proposed " performance of optical wavelength multiplex communication can be improved while the tightness of optical filter is relaxed
Reflective optical system, light and channel-splitting filter and photosystem ", but the purpose of the patent application be " improve optical wavelength multiplex lead to
Letter ".It further provides a kind of way of realization of special light multiplexer/demultiplexer.Wavelength division multiplexer (abbreviation WDM) common are
CWDM and two kinds of DWDM, CWDM and the DWDM main distinction are：Relative to the wavelength of 0.2nm to 1.2nm in dwdm system
For interval, CWDM has broader wavelength interval, and the current standard wave length of industry is at intervals of 20nm.The utility model Shen
Please be substantially a kind of CWDM implementation, it is different from common light multiplexer/demultiplexer.
Existing optical fiber sensing technology is typically all used as Fibre Optical Sensor using independent fibre core resource, is sensed in sensing network
The sensing data of node can only borrow other approach to transmit and collect, and the fibre core for sensing is without making general purpose light
Fiber communication.The resource of idle fibre core may be difficult to be fully utilized so in communications optical cable or power cable.
Utility model content
For the disadvantages described above or Improvement requirement of prior art, the utility model provides a kind of distributed for POTDR
The optical fiber multiplexing system of Fibre Optical Sensor, it is intended that by cleverly setting optical module and element, multiple light paths are ingenious
Be arranged in same system, it is real in identical optical fiber to thus achieve optical fiber communication function and optical fiber polarisation sensing function
It is existing, improve the utilization ratio of optical fiber.
To achieve the above object, according to one side of the present utility model, there is provided one kind is used for POTDR distribution light
The optical fiber multiplexing system of fibre sensing, it includes sense light waveform generator and optical fiber multiplexing unit, described to sense waveform
Device connects three optical fiber multiplexing units simultaneously, and the structure of three optical fiber multiplexing units is identical, and the optical fiber multiplexing unit includes the
One communication optical module, the first smooth multiplexer/demultiplexer, the second smooth multiplexer/demultiplexer, second communication optical module, sensing light source, optical circulator,
Reflector, polarization state analyzer or multi-polarization state analyzer, sense light spy group, transducing signal filter and amplification module and POTDR
Distributed sensing signal detection module, wherein, the output end of a sense light waveform generator connects three and senses the defeated of light source
Enter end, the output end of the sensing light source connects the first port of the optical circulator, and the second port of the optical circulator connects
The second port of the described first smooth multiplexer/demultiplexer is connect, the 3rd port of the optical circulator connects the defeated of the polarization state analyzer
Enter end, the first communication optical module is connected with the first port of the described first smooth multiplexer/demultiplexer, the first smooth multiplexer/demultiplexer
The 3rd port be connected with the first port of the second smooth multiplexer/demultiplexer, described in the connection of the second port of the second smooth multiplexer/demultiplexer
Second communication optical module, the 3rd port of the second smooth multiplexer/demultiplexer connect the reflector, the polarization state analyzer or
The output end of multi-polarization state analyzer connects the input of the sense light spy group, the output end connection institute of the sense light spy group
The input of transducing signal filter and amplification module is stated, the transducing signal filter and amplification module output end connects described POTDR points
Cloth transducing signal detection module, the POTDR distributed sensings signal detection module are used to detect vibration, deformation on optical link
Or the physical location of generation and the generation of temperature change.
Further, the first communication optical module is used for the communicating light signal for sending or receiving setting wavelength X 1, institute
State sense light waveform generator to be used to produce electronic impulse, the electronic impulse is used to excite the sensing light source to launch setting ripple
Long λ 2 sensing impulse light, the optical circulator are used for the forward sense pulse optical transport from the sensing light source to first
Light multiplexer/demultiplexer, and by from the first smooth multiplexer/demultiplexer output backwards to sensing impulse optical transport to polarization state analyzer, described the
One smooth multiplexer/demultiplexer is used to two kinds of different wave length λ 1 and λ 2 light beam merging into same light beam, to generate wdm light beam,
And wdm light beam is reversely decomposed into different wave length λ 1 and λ 2 two light beams, the second smooth multiplexer/demultiplexer is used for ripple
Point multiplexed beam is decomposed into different wave length λ 1 and λ 2 two light beams, and reversely by two kinds of different wave length λ 1 and λ 2 two light beams
Wdm light beam is merged into, the reflector is used to the forward sense pulsed light for setting wavelength X 2 reflexing to institute along original optical path
Optical circulator is stated, the second communication optical module is used for the communicating light signal for receiving or sending setting wavelength X 1, the polarization
State analyzer or multi-polarization state analyzer be used for the intensity of polarization light for detecting the single setting polarization angle of sensing impulse light or
The intensity of polarization light of multiple setting angles of polarization, the sense light spy group is for detecting and receiving from the polarization state analyzer
The polarised light of single or multiple polarization angles, and current signal is translated into respectively, the transducing signal filter and amplification module
For the voltage signal for the polarised light for receiving the single or multiple polarization angles of expression from the sense light spy group, and it is entered
The filter and amplification of row signal, to obtain the voltage of the polarised light that represents single or multiple polarization angles of the waveform Jing Guo shaping letter
Number, the POTDR distributed sensings signal detection module is used for the single or multiple polarization angles of the expression by shaping
The change of voltage signal of polarised light tested and analyzed with time response, to detect vibration, deformation or temperature on optical link
Spend the generation of change and the physical location of generation.
Further, the described first smooth multiplexer/demultiplexer is identical with the described second smooth multiplexer/demultiplexer structure, first light point
Wave multiplexer and the second smooth multiplexer/demultiplexer are respectively λ 1 and λ 2 two partial wave ports comprising division ripple wavelength, and described first
Light multiplexer/demultiplexer and the second smooth multiplexer/demultiplexer are symmetrical arranged in systems, and between the multiplex port of two multiplexer/demultiplexers
It is connected with telecommunication optical fiber.
Further, the optical circulator ring port number is more than or equal to 3, and its ring of light line direction is followed successively by first end
Mouth, second port, the 3rd port to the last a port.
Further, the optical circulator is replaced using optical splitter, described in the first output port connection of the optical splitter
Light source is sensed, the input port of the optical splitter connects the first smooth multiplexer/demultiplexer, the second input port of the optical splitter
The polarization state analyzer is connected, the optical splitter is used to the first smooth multiplexer/demultiplexer also use forward sense pulse optical transport
In will be backwards to sensing impulse optical transport to the polarization state analyzer.
Further, the optical circulator is replaced using photo-coupler, described in the first port connection of the photo-coupler
Light source is sensed, the 3rd port of the photo-coupler connects the first smooth multiplexer/demultiplexer, the second port of the photo-coupler
Connect the polarization state analyzer, the port tail optical fiber of photo-coupler the 4th is directly cut and hanging, and the photo-coupler is used for
By forward sense pulse optical transport to the first smooth multiplexer/demultiplexer, it is additionally operable to examine backwards to sensing impulse optical transport to the polarization state
Inclined device.
Further, any splitting ratio of the splitting ratio of the optical splitter, preferably splitting ratio are 50:50.
Further, the coupled ratio of photo-coupler is arbitrarily coupling ratio, and preferred coupled ratio is 50:50.
Further, it is described first communication optical module and the first smooth multiplexer/demultiplexer between, the first smooth multiplexer/demultiplexer
Between the described second smooth multiplexer/demultiplexer, the second smooth multiplexer/demultiplexer and the second Communication ray intermodule, the sensing light source
With the optical circulator, the optical circulator with being connected between the described first smooth multiplexer/demultiplexer with telecommunication optical fiber, described second
It is connected between multiplexer/demultiplexer and the reflector with telecommunication optical fiber.
Further, between the optical splitter and the polarization state analyzer, the polarization state analyzer and the sense light
Be connected between spy group with telecommunication optical fiber, between the sense light spy group and the transducing signal filter and amplification module, it is described sensing letter
Number it is connected between filter and amplification module and the POTDR distributed sensings signal detection module with circuit.
Further, the first communication optical module is identical with the structure of the described second communication optical module.
In general, by the contemplated above technical scheme of the utility model compared with prior art, can obtain down
Row beneficial effect：
The different recovery of two kinds of direct current sense light and Communication ray is synthesized into wavelength division multiplexed light, although by two beam different wave lengths
It is not at all surprising that recovery synthesizes a branch of wavelength division multiplexed light, still, in the utility model device, there is provided sense light waveform generator,
Sense light source, optical circulator and follow-up reflector, polarization state analyzer or multi-polarization state analyzer, sense light spy group, pass
Feel signal filter and amplification module and POTDR distributed sensing signal detection modules, cleverly connected with upper module or component
Together, electronic impulse is produced with sense light waveform generator, to excite sensing light source to produce sensing impulse light, with sensing impulse
Light and Communication ray are combined into wdm light beam, and wdm light beam can be because temperature, vibration in the transmitting procedure of long range
Or deform and the change of polarization state occurs, reflector is set in terminal, again reflected sensing impulse light using reflector,
And then give sensing impulse optical transport to follow-up polarization state analyzer or multi-polarization state analyzer, sense light by optical circulator again
Spy group, transducing signal filter and amplification module and POTDR distributed sensing signal detection modules, after being carried out to pulse sense light
Continuous analyzing and processing, the generation of change and the reality of generation such as vibration, deformation or temperature on optical link are obtained so as to detect
Position.The present utility model application dexterously by multiple optical components or module organic linking together, successfully optical fiber is led to
Telecommunication function and optical fiber polarisation sensing function are realized in identical optical fiber, improve the utilization ratio of optical fiber.
The utility model uses the optical fiber sensing technology of Polarization Detection, directly uses the single mode or multimode fibre of telecommunications use
Complete the detection of Polarization-Sensitive amount, it is not necessary to use special sensor fibre such as polarization maintaining optical fibre, it is not required that the coupling on sensing point
Closing light gate sensor, the utility model provide the optical cable of low cost or the distributed sensing ability of power cable line.
Brief description of the drawings
Fig. 1 is that the structure of the optical fiber multiplexing system for POTDR distributing optical fiber sensings in the utility model embodiment is shown
It is intended to, wherein, the detailed construction schematic diagram of an optical fiber multiplexing unit is merely given as, the structure of three optical fiber multiplexing units is
It is identical.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only explaining
The utility model, it is not used to limit the utility model.In addition, institute in each embodiment of the utility model disclosed below
As long as the technical characteristic being related to does not form conflict each other, can is mutually combined.
Fig. 1 is that the structure of the optical fiber multiplexing system for POTDR distributing optical fiber sensings in the utility model embodiment is shown
It is intended to, the optical fiber multiplexing system of the present utility model for POTDR distributing optical fiber sensings is used for fiber optic communication and is distributed with POTDR
Formula Fibre Optical Sensor, as seen from the figure, it includes sense light waveform generator and three optical fiber multiplexing units, three optical fiber multiplexing units
Structure it is identical, each optical fiber multiplexing unit include first communication optical module, the first smooth multiplexer/demultiplexer, the second smooth division ripple
Device, the second communication optical module, sense light waveform generator, optical circulator, reflector, polarization state analyzer or multi-polarization state analyzing
Device, sense light spy group, transducing signal filter and amplification module and POTDR distributed sensing signal detection modules.Wherein, a biography
The output end of photosensitive waveform generator connects the input of three sensing light sources.
Wherein, in optical fiber multiplexing unit, the first end of the first communication optical module and the described first smooth multiplexer/demultiplexer
Mouth is connected, and the 3rd port of the first smooth multiplexer/demultiplexer is connected with the first port of the second smooth multiplexer/demultiplexer, second light
Second port connection the second communication optical module of multiplexer/demultiplexer, the input of a sense light waveform generator connect respectively
The input of three sensing light sources, the output end of the sensing light source connect the first port of the optical circulator, the ring of light
The second port of row device connects the second port of the first smooth multiplexer/demultiplexer, and the 3rd port of the optical circulator is with Communication ray
Fibre connects the input of the polarization state analyzer, and the 3rd port of the second smooth multiplexer/demultiplexer connects the reflector, institute
The input of the output end connection sense light spy group of polarization state analyzer or multi-polarization state analyzer is stated, the sense light is visited
The output end of group connects the input of the transducing signal filter and amplification module, the output of the transducing signal filter and amplification module
End connects the POTDR distributed sensings signal detection module.
In more detail, the first communication optical module is used for the communicating light signal for sending or receiving setting wavelength X 1, institute
State sense light waveform generator to be used to produce electronic impulse, the electronic impulse is used to excite the sensing light source to launch setting ripple
Long λ 2 sensing impulse light, the optical circulator are used for the forward sense pulse optical transport from the sensing light source to first
Light multiplexer/demultiplexer, and by from the first smooth multiplexer/demultiplexer output backwards to sensing impulse optical transport to polarization state analyzer, described the
One smooth multiplexer/demultiplexer is used to two kinds of different wave length λ 1 and λ 2 light beam merging into same light beam, to generate wdm light beam,
And wdm light beam is reversely decomposed into different wave length λ 1 and λ 2 two light beams, the second smooth multiplexer/demultiplexer is used for ripple
Point multiplexed beam is decomposed into different wave length λ 1 and λ 2 two light beams, and reversely by two kinds of different wave length λ 1 and λ 2 two light beams
Wdm light beam is merged into, the reflector is used to the forward sense pulsed light for setting wavelength X 2 reflexing to institute along original optical path
Optical circulator is stated, the second communication optical module is used for the communicating light signal for receiving or sending setting wavelength X 1, the polarization
State analyzer or multi-polarization state analyzer be used for the intensity of polarization light for detecting the single setting polarization angle of sensing impulse light or
The intensity of polarization light of multiple setting angles of polarization, the sense light spy group is for detecting and receiving from the polarization state analyzer
The polarised light of single or multiple polarization angles, and current signal is translated into respectively, the transducing signal filter and amplification module
For the voltage signal for the polarised light for receiving the single or multiple polarization angles of expression from the sense light spy group, and it is entered
The filter and amplification of row signal, to obtain the voltage of the polarised light that represents single or multiple polarization angles of the waveform Jing Guo shaping letter
Number, the POTDR distributed sensings signal detection module is used for the single or multiple polarization angles of the expression by shaping
The change of voltage signal of polarised light tested and analyzed with time response, to detect vibration, deformation or temperature on optical link
Spend the generation of change and the physical location of generation.
In another embodiment of the present utility model, the first smooth multiplexer/demultiplexer and the second smooth multiplexer/demultiplexer knot
Structure is identical, and the first smooth multiplexer/demultiplexer and the second smooth multiplexer/demultiplexer are respectively the two of λ 1 and λ 2 comprising division ripple wavelength
Individual partial wave port, the first smooth multiplexer/demultiplexer and the second smooth multiplexer/demultiplexer are symmetrical arranged in systems, and at this two
It is connected between the multiplex port of multiplexer/demultiplexer with telecommunication optical fiber.
In another embodiment of the present utility model, the optical circulator is replaced using optical splitter, the optical splitter
First output port connects the sensing light source, and the input port of the optical splitter connects the first smooth multiplexer/demultiplexer, described
Second input port of optical splitter connects the polarization state analyzer, and the optical splitter is used for forward sense pulse optical transport extremely
First smooth multiplexer/demultiplexer, it is additionally operable to backwards to sensing impulse optical transport to the polarization state analyzer.The light splitting of the optical splitter
Than any splitting ratio, preferably splitting ratio is 50:50.
In another embodiment of the present utility model, the optical circulator, the optical coupling are replaced using photo-coupler
The first port of device connects the sensing light source, and the 3rd port of the photo-coupler connects the first smooth multiplexer/demultiplexer, institute
The second port for stating photo-coupler connects the polarization state analyzer, and the port tail optical fiber of photo-coupler the 4th is directly cut and hanged
Sky, the photo-coupler are used for forward sense pulse optical transport to the first smooth multiplexer/demultiplexer, are additionally operable to backwards to sensing impulse
Optical transport is to the polarization state analyzer.The coupled ratio of photo-coupler is arbitrarily coupling ratio, and preferred coupled ratio is 50:50.
In another embodiment of the present utility model, the first communication optical module and the described first smooth multiplexer/demultiplexer
Between, the first smooth multiplexer/demultiplexer between the described second smooth multiplexer/demultiplexer, the second smooth multiplexer/demultiplexer communicates with described second
Between optical module, between the sensing light source and the optical circulator, the optical circulator and the first smooth multiplexer/demultiplexer with logical
Letter optical fiber is connected, and second multiplexer/demultiplexer is connected between the reflector with telecommunication optical fiber.The optical splitter and institute
State between polarization state analyzer, the polarization state analyzer with being connected between the sense light spy group with telecommunication optical fiber, the sensing
Between light spy group and the transducing signal filter and amplification module, the transducing signal filter and amplification module and the POTDR it is distributed
Transducing signal detection module is connected with circuit.
In the utility model, sense light waveform generator connection sensing light source, sense light waveform generator is electronic device,
It is used to produce electronic impulse, and the electronic impulse, which exports, gives sensing light source, obtains sensing light source electric to send sensing impulse light.
In order to understand the utility model in more detail, the present utility model application dexterously light path is analyzed from light path angle below
Design, the light path of its core have two：
First light path is:The first communication communication optical module of optical module → optical multiplexer → optical branching filter → second, this
Light path is by realizing optical communication capabilities.Communication ray can transmitted in both directions in this light path.
Article 2 light path is：Sense light waveform generator → sensing light source → optical circulator → optical multiplexer → optical branching filter
→ reflector → optical branching filter → optical multiplexer → optical circulator → mono- polarization state analyzer or multi-polarization state analyzer → sensing
Light spy group or sense light spy group group → transducing signal filter and amplification module → POTOR distributed sensing signal detection modules, should
Bar light path realizes sensor measuring function with pulsed light, due to being pulsed light, without carrying out intensity modulation.Pulsed light is in the light path
It is one-way transmission, using sense light waveform generator as starting point, using POTOR distributed sensings signal detection module as terminal.It is actual
On, Article 2 light path route in partial sector is overlapping.
The present utility model application is ingenious to use wavelength-division multiplex technique, realizes polarization sense on same root optical fiber simultaneously and leads to
Telecommunication function, multiple functions are realized simultaneously on an optical fiber, without laying new optical fiber so that sensing fibre core is used for fiber distribution
Formula can also be used for the data transfer of general purpose while sensing, so as to improve the utilization rate of sensor fibre.The utility model
Application directly uses telecommunication optical fiber to be not required to lay grating sensor on optic communication links, eliminate as polarization sense medium
Laying grating sensor insertion loss to caused by communication link.
As it will be easily appreciated by one skilled in the art that preferred embodiment of the present utility model is the foregoing is only, not
To limit the utility model, any modification of all made within spirit of the present utility model and principle, equivalent substitution and change
Enter, should be included within the scope of protection of the utility model.
Claims (9)
1. a kind of optical fiber multiplexing system for POTDR distributing optical fiber sensings, it is characterised in that it includes sensing waveform hair
Raw device and optical fiber multiplexing unit, the sense light waveform generator connect three optical fiber multiplexing units, three optical fiber multiplexings simultaneously
The structure of unit is identical,
The optical fiber multiplexing unit includes the first communication optical module, the first smooth multiplexer/demultiplexer, the second smooth multiplexer/demultiplexer, the second communication
Optical module, sensing light source, optical circulator, reflector, polarization state analyzer or multi-polarization state analyzer, sense light spy group, sensing
Signal filter and amplification module and POTDR distributed sensing signal detection modules, wherein,
The output end of one sense light waveform generator connects the input of three sensing light sources,
The output end of the sensing light source connects the first port of the optical circulator, the second port connection of the optical circulator
The second port of the first smooth multiplexer/demultiplexer, the 3rd port of the optical circulator connect the input of the polarization state analyzer
End,
The first communication optical module is connected with the first port of the described first smooth multiplexer/demultiplexer,
3rd port of the first smooth multiplexer/demultiplexer is connected with the first port of the second smooth multiplexer/demultiplexer,
Second port connection the second communication optical module of the second smooth multiplexer/demultiplexer,
3rd port of the second smooth multiplexer/demultiplexer connects the reflector,
The output end of the polarization state analyzer or multi-polarization state analyzer connects the input of the sense light spy group,
The output end of the sense light spy group connects the input of the transducing signal filter and amplification module,
The transducing signal filter and amplification module output end connects the POTDR distributed sensings signal detection module, described
POTDR distributed sensings signal detection module is used to detect vibration, deformation or the generation of temperature change and hair on optical link
Raw physical location.
A kind of 2. optical fiber multiplexing system for POTDR distributing optical fiber sensings as claimed in claim 1, it is characterised in that
The first communication optical module is used for the communicating light signal for sending or receiving setting wavelength X 1,
The sense light waveform generator is used to produce electronic impulse, and the electronic impulse is used to excite the sensing light source to launch
The sensing impulse light of wavelength X 2 is set,
The optical circulator is used for the forward sense pulse optical transport from the sensing light source to the first smooth multiplexer/demultiplexer, and
By from the first smooth multiplexer/demultiplexer output backwards to sensing impulse optical transport to polarization state analyzer,
The first smooth multiplexer/demultiplexer is used to two kinds of different wave length λ 1 and λ 2 light beam merging into same light beam, to generate wavelength-division
Multiplexed beam, and wdm light beam is reversely decomposed into different wave length λ 1 and λ 2 two light beams,
The second smooth multiplexer/demultiplexer is used for the two light beams that wdm light beam is decomposed into different wave length λ 1 and λ 2, and reversely
Two kinds of different wave length λ 1 and λ 2 two light beams are merged into wdm light beam,
The reflector is used to the forward sense pulsed light for setting wavelength X 2 reflexing to the optical circulator along original optical path,
The second communication optical module is used for the communicating light signal for receiving or sending setting wavelength X 1,
The polarization state analyzer or multi-polarization state analyzer are used for the single setting polarization angle for detecting sensing impulse light
The intensity of polarization light of intensity of polarization light or multiple setting angles of polarization,
The sense light spy group is single from the polarization state analyzer or multi-polarization state analyzer for detecting and receiving
Or the polarised light of multiple polarization angles, and current signal is translated into respectively,
The transducing signal filter and amplification module is used to receive the single or multiple angles of polarization of expression from the sense light spy group
The voltage signal of the polarised light of degree, and the filter and amplification of signal is carried out to it, with obtain waveform by shaping represent it is single or
The voltage signal of the polarised light of multiple polarization angles,
The POTDR distributed sensings signal detection module is used for the single or multiple polarization angles of the expression by shaping
The change of voltage signal of polarised light tested and analyzed with time response, to detect vibration, deformation or temperature on optical link
Spend the generation of change and the physical location of generation.
3. it is used for the optical fiber multiplexing system of POTDR distributing optical fiber sensings as claimed in claim 2, it is characterised in that described
First smooth multiplexer/demultiplexer is identical with the described second smooth multiplexer/demultiplexer structure, the first smooth multiplexer/demultiplexer and the second smooth division
Ripple device is respectively λ 1 and λ 2 two partial wave ports comprising division ripple wavelength,
The first smooth multiplexer/demultiplexer and the second smooth multiplexer/demultiplexer are symmetrical arranged in systems, and in two multiplexer/demultiplexers
Multiplex port between be connected with telecommunication optical fiber.
A kind of 4. optical fiber multiplexing system for POTDR distributing optical fiber sensings as claimed in claim 3, it is characterised in that
The optical circulator ring port number is more than or equal to 3, and its ring of light line direction is followed successively by first port → second port → the
Three ports.
A kind of 5. optical fiber multiplexing system for POTDR distributing optical fiber sensings as claimed in claim 1, it is characterised in that
The optical circulator is replaced using optical splitter, the first output port of the optical splitter connects the sensing light source, the light splitting
The input port of device connects the first smooth multiplexer/demultiplexer, and the second output port of the optical splitter connects the polarization state analyzing
Device or multi-polarization state analyzer, the optical splitter are used to the first smooth multiplexer/demultiplexer also use forward sense pulse optical transport
In will be backwards to sensing impulse optical transport to the polarization state analyzer or multi-polarization state analyzer.
A kind of 6. optical fiber multiplexing system for POTDR distributing optical fiber sensings as claimed in claim 1, it is characterised in that
The optical circulator is replaced using photo-coupler, the first input port of the photo-coupler connects the sensing light source, described
First output port of photo-coupler connects the first smooth multiplexer/demultiplexer, the second input port connection institute of the photo-coupler
State polarization state analyzer, the second output port of photo-coupler tail optical fiber cut it is simultaneously hanging, the photo-coupler be used for by it is preceding to
Sensing impulse optical transport to the first smooth multiplexer/demultiplexer, be additionally operable to backwards to sensing impulse optical transport to the polarization state analyzer or
Person's multi-polarization state analyzer.
A kind of 7. optical fiber multiplexing system for POTDR distributing optical fiber sensings as claimed in claim 6, it is characterised in that
The coupled ratio of photo-coupler is arbitrarily coupling ratio.
A kind of 8. optical fiber multiplexing system for POTDR distributing optical fiber sensings as claimed in claim 1, it is characterised in that
Between the first communication optical module and the first smooth multiplexer/demultiplexer, the first smooth multiplexer/demultiplexer and the described second smooth division ripple
Between device, it is the second smooth multiplexer/demultiplexer and the second Communication ray intermodule, the sensing light source and the optical circulator, described
It is connected between optical circulator and the described first smooth multiplexer/demultiplexer with telecommunication optical fiber, the second smooth multiplexer/demultiplexer and the reflection
It is connected between device with telecommunication optical fiber.
A kind of 9. optical fiber multiplexing system for POTDR distributing optical fiber sensings as claimed in claim 5, it is characterised in that
Between the optical splitter and the polarization state analyzer, between the polarization state analyzer and the sense light spy group with telecommunication optical fiber
It is connected, between the sense light spy group and the transducing signal filter and amplification module, the transducing signal filter and amplification module and institute
State and be connected with circuit between POTDR distributed sensing signal detection modules.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720570668.9U CN207197545U (en) | 2017-05-22 | 2017-05-22 | A kind of optical fiber multiplexing system for POTDR distributing optical fiber sensings |
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| CN201720570668.9U CN207197545U (en) | 2017-05-22 | 2017-05-22 | A kind of optical fiber multiplexing system for POTDR distributing optical fiber sensings |
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Effective date of registration: 20211108 Address after: 430000 No. 6, Jiangxing Road, Jianghan Economic Development Zone, Wuhan City, Hubei Province Patentee after: WUHAN SHIJI JINQIAO SAFETY TECHNOLOGY Co.,Ltd. Address before: 215311 floor 5, Chuangye building, 88 Xueyuan Road, Bacheng Town, Kunshan City, Jiangsu Province, Suzhou City, Jiangsu Province Patentee before: KUNSHAN JINMING PHOTOELECTRIC SCIENCE & TECHNOLOGY Co.,Ltd. |