CN206002195U - It is applied to the polarized controller of distributed optical fiber vibration sensing system - Google Patents

It is applied to the polarized controller of distributed optical fiber vibration sensing system Download PDF

Info

Publication number
CN206002195U
CN206002195U CN201620912567.0U CN201620912567U CN206002195U CN 206002195 U CN206002195 U CN 206002195U CN 201620912567 U CN201620912567 U CN 201620912567U CN 206002195 U CN206002195 U CN 206002195U
Authority
CN
China
Prior art keywords
optical fiber
photodetector
controller
phase
circulator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201620912567.0U
Other languages
Chinese (zh)
Inventor
王绍俊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NANJING XINTIANWEI PHOTOELECTRIC TECHNOLOGY Co Ltd
Original Assignee
NANJING XINTIANWEI PHOTOELECTRIC TECHNOLOGY Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NANJING XINTIANWEI PHOTOELECTRIC TECHNOLOGY Co Ltd filed Critical NANJING XINTIANWEI PHOTOELECTRIC TECHNOLOGY Co Ltd
Priority to CN201620912567.0U priority Critical patent/CN206002195U/en
Application granted granted Critical
Publication of CN206002195U publication Critical patent/CN206002195U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Landscapes

  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Mechanical Light Control Or Optical Switches (AREA)

Abstract

This utility model provides a kind of polarized controller being applied to distributed optical fiber vibration sensing system, on the basis of the conspicuous once moral fibre optic interferometer structure of span, introduce signal processing module, Polarization Controller and phase-modulator, during application, apply sine wave to phase-modulator as reference signal, signal processing module obtains the signal that photodetector receives, and signal is analyzed processing, the modulation voltage value of corresponding Polarization Controller when obtaining two paths of signals difference minimum using simulated annealing, using this magnitude of voltage, Polarization Controller is controlled, the polarization state compensating light changes.Apply this device being capable of signal polarization state in a pickup arm in adjustment system, keep signal polarization state in two pickup arms consistent as far as possible, the anti-polarization degeneration ability of raising system, and largely eliminate the impact of the disturbance positioning precision to system for the single-mode fiber birefringence, improve the positioning precision of system.

Description

It is applied to the polarized controller of distributed optical fiber vibration sensing system
Technical field
This utility model is related to Fibre Optical Sensor and detection technique field, and more particularly, to one kind is applied to distributed optical fiber vibration The polarized controller of sensor-based system.
Background technology
With the enhancing of scientific and technological development and people's security protection consciousness, a kind of investigative range of development is big, energy consumption is little, low cost Perimeter security system becomes a necessary and problem in the urgent need to address.Distributed optical fiber vibration sensing system relies on it sensitive Degree is high, electromagnetism interference, the advantages of need not powering, in security protection necks such as military defense, financial protection, energy security, community security Domain there has been and is widely applied, and also will have vast application prospect in future.
It is exactly that the light vector direction of vibration participating in interfering is identical because light wave produces one of essential condition interfered, that is, have phase Same polarization direction component.The optical fiber that actual perturbed system adopts is general single mode fiber, because the birefringence of single-mode fiber is special Property, light wave entrance optical fiber retrodeviates polarization state and can change, and leads to the polarization state of line polarisation to be degenerated.In sensory field, this can lead to Visibility of interference fringes reduces, or even interference fringe disappears, and then makes system that the positioning precision of disturbance is greatly reduced.
Although the polarization state of light can be kept constant using polarization maintaining optical fibre, due to the light of distributed optical fiber vibration sensing system Fibre lays distance and is typically all up to tens kilometers, system cost can be made too high using polarization maintaining optical fibre.Therefore, in actual applications, We must take the polarization of light in another kind of means countermeasure system to degenerate, and the polarization state compensating light changes, thus as much as possible The system positioning that the birefringent characteristic of elimination single-mode fiber leads to is inaccurate.
Content of the invention
The purpose of this utility model is to provide a kind of polarized controller being applied to distributed optical fiber vibration sensing system, In the case of being intended to excessively not improve cost, solve the problems, such as that the system positioning that the birefringent characteristic of single-mode fiber leads to is inaccurate.
This utility model solves its technical problem and be employed technical scheme comprise that:
A kind of polarized controller being applied to distributed optical fiber vibration sensing system, including light source, 1X4 beam splitter, One circulator, the second circulator, the 3rd circulator, fourth annular device, the first photodetector, the second photodetector, the 3rd Photodetector, the 4th photodetector, Polarization Controller, phase-modulator, sensing optic cable, signal processing module, wherein:
Light source is connected to the first end of 1X4 beam splitter, the second end of 1X4 beam splitter respectively with first annular device, the second ring Shape device, the 3rd circulator, fourth annular device connect;
First annular device is also connected with the first photodetector, and the second circulator is also connected with the second photodetector, the Three circulators are also connected with the 3rd photodetector, and fourth annular device is also connected with the 4th photodetector;
First photodetector, the second photodetector, the 3rd photodetector, the 4th photodetector also respectively with letter Number processing module connects;
Sensing optic cable includes the first optical fiber, the second optical fiber, the first optical fiber be connected to first annular device and the 3rd circulator it Between, the second optical fiber is connected between the second circulator and fourth annular device;
Polarization Controller is connected on the first optical fiber, and Polarization Controller is also connected with signal processing module;Phase-modulator It is connected on the second optical fiber, phase-modulator is also connected with signal processing module.
On the basis of above-described embodiment, further, signal processing module includes data collecting card, computer and monolithic Machine, wherein:
The input of data collecting card is connected with the first photodetector, the second photodetector respectively, data collecting card Outfan be connected with computer;
Computer is also connected with single-chip microcomputer;
Single-chip microcomputer is also connected with Polarization Controller, phase-modulator respectively.
On the basis of above-mentioned any embodiment, further, described light source is continuous mono-colour laser.
On the basis of above-mentioned any embodiment, further, described Polarization Controller is extrusion pressing type Polarization Controller.
On the basis of above-described embodiment, further, described extrusion pressing type Polarization Controller includes four directions of extrusion one-tenth 45 °, staggered optical fiber squeezer.
On the basis of above-mentioned any embodiment, further, described phase-modulator is adjusted for Lithium metaniobate birefringent phase Device processed.
The beneficial effects of the utility model are:
This utility model provides a kind of polarized controller being applied to distributed optical fiber vibration sensing system, and application is originally Device can signal polarization state in a pickup arm in adjustment system, keep the signal light polarization in two pickup arms as far as possible State is consistent, thus being effectively improved the anti-polarization degeneration ability of distributed optical fiber vibration sensing system, and largely disappears Except the impact of the disturbance positioning precision to system for the single-mode fiber birefringence, improve the positioning precision of system.
Brief description
With reference to the accompanying drawings and examples this utility model is further illustrated.
Fig. 1 shows a kind of polarization being applied to distributed optical fiber vibration sensing system that this utility model embodiment provides The structural representation of control device.
In figure, 1, light source, 2,1X4 beam splitter, 301, first annular device, the 302, second circulator, the 303, the 3rd circulator, 304th, fourth annular device, 5, Polarization Controller, 6, phase-modulator, 7, sensing optic cable, the 801, first photodetector, 802, Two photodetectors, the 803, the 3rd photodetector, the 804, the 4th photodetector, 9, data collecting card, 10, computer, 11, Single-chip microcomputer, 12, signal processing module.
Specific embodiment
In order that the purpose of this utility model, technical scheme and advantage become more apparent, below in conjunction with accompanying drawing and enforcement Example, is further elaborated to this utility model.It should be appreciated that specific embodiment described herein is only in order to explain this Utility model, does not limit this utility model.
As shown in figure 1, this utility model embodiment provides and a kind of is applied to the inclined of distributed optical fiber vibration sensing system Shake control device, including light source 1,1X4 beam splitter 2, first annular device 301, the second circulator 302, the 3rd circulator 303, Four circulators 304, the first photodetector 801, the second photodetector 802, the 3rd photodetector 803, the 4th smooth electrical resistivity survey Survey device 804, Polarization Controller 5, phase-modulator 6, sensing optic cable 7, signal processing module 12, wherein:
Light source 1 is connected to the first end of 1X4 beam splitter 2, the second end of 1X4 beam splitter 2 respectively with first annular device 301, Second circulator 302, the 3rd circulator 303, fourth annular device 304 connect;
First annular device 301 is also connected with the first photodetector 801, the second circulator 302 also with the second photodetection Device 802 connects, and the 3rd circulator 303 is also connected with the 3rd photodetector 803, fourth annular device 304 also with the 4th smooth electrical resistivity survey Survey device 804 to connect;
First photodetector 801, the second photodetector 802, the 3rd photodetector 803, the 4th photodetector 804 are also connected with signal processing module 12 respectively;
Sensing optic cable 7 includes the first optical fiber 701, the second optical fiber 702, the first optical fiber 701 be connected to first annular device 301 with Between 3rd circulator 303, the second optical fiber 702 is connected between the second circulator 302 and fourth annular device 304;
Polarization Controller 5 is connected on the first optical fiber 701, and Polarization Controller 5 is also connected with signal processing module 12;Phase place Manipulator 6 is connected on the second optical fiber 702, and phase-modulator 6 is also connected with signal processing module 12.
This utility model embodiment, on the basis of double Mach-Zehnders (Mach-Zehnder) fibre optic interferometer structure, is drawn Enter signal processing module 12, Polarization Controller 5 and phase-modulator 6, apply this device to carry out use field during Polarization Control Scape can be such:Apply the sine wave of certain frequency and amplitude to phase-modulator 6, as reference signal;Signal processing Module 12 obtains the signal that in distributed optical fiber disturbance positioning system, photodetector 801,802,803,804 receives, and right Signal is analyzed processing, and using simulated annealing, the optimal modulation voltage value being applied on Polarization Controller 5 is searched Rope, the modulation voltage value of corresponding Polarization Controller when obtaining two paths of signals difference minimum;Using this magnitude of voltage to Polarization Control Device 5 is controlled, and two paths of signals difference can be made to reach minimum, thus the polarization state compensating light changes, completes distribution type fiber-optic and shakes The Polarization Control process of dynamic sensor-based system.This utility model embodiment can flashlight in a pickup arm in adjustment system inclined Polarization state, keeps the signal polarization state in two pickup arms consistent as far as possible, thus be effectively improved distributed optical fiber vibration passing The anti-polarization degeneration ability of sensing system, and largely eliminate single-mode fiber birefringence to the disturbance positioning precision of system Impact, improves the positioning precision of system.
This utility model embodiment does not limit to signal processing module, it is preferred that believing on the basis of above-described embodiment Number processing module can include data collecting card 9, computer 10 and single-chip microcomputer 11, wherein:The input of data collecting card 9 is respectively It is connected with the first photodetector 801, the second photodetector 802, the outfan of data collecting card 9 is connected with computer 10; Computer 10 is also connected with single-chip microcomputer 11;Single-chip microcomputer 11 is also connected with Polarization Controller 5, phase-modulator 6 respectively.Data acquisition Card 9 is acquired to the voltage signal of the first photodetector 801 and the second photodetector 802 input, and sends into computer 10 process;The process gathering signal that data collecting card 9 is sent is realized in software programming in computer 10, to realize most preferably adjusting The iterative search of voltage processed, and the optimal modulation voltage searching is fed back to Polarization Controller 5 and phase place by single-chip microcomputer 11 Manipulator 6;Single-chip microcomputer 11, by being communicated with computer 10, can directly control Polarization Controller 5 with output digit signals, defeated Go out sine wave signal phase-modulator 6 is modulated.
This utility model embodiment does not limit to light source 1, it is preferred that described on the basis of above-mentioned any embodiment Light source 1 can be continuous mono-colour laser.
This utility model embodiment does not limit to Polarization Controller 5, on the basis of above-mentioned any embodiment, preferably , described Polarization Controller 5 can be extrusion pressing type Polarization Controller.On this basis it is preferred that described extrusion pressing type Polarization Control Device can include that four direction of extrusion is at 45 °, staggered optical fiber squeezer.In control process, using wherein the first two light Fine squeezer, applies the voltage of various combination to it, can carry out different modulation to the polarization state of input light wave, thus exporting The light wave of different polarization states;This extrusion pressing type Polarization Controller is connected on basic distributed optical fiber vibration sensing system sensor fibre Wherein one tunnel, such as on the first optical fiber 701, realized to distributed optical fiber vibration by the polarization state modulating this road optical signal The Polarization Control of sensor-based system.
This utility model does not limit to the material of phase-modulator, can select Lithium metaniobate (LiNbO3), GaAs (GaAs) or polymer (Polymer) etc. as phase-modulator material, on the basis of above-mentioned any embodiment, preferably , described phase-modulator can be Lithium metaniobate birefringent phase manipulator.Fiber waveguide in GaAs and polymer modulator For carrying ridge waveguide, it is much greater with single-mode fiber with the loss ratio lithium niobate waveguides of single-mode fiber light connects, and polymer is modulated The long-time stability of device are also undesirable, and therefore the embodiment of the present invention can select lithium niobate modulator, Lithium metaniobate birefringent phase Manipulator makes fiber waveguide by titanium diffusion technique, and input-output optical fiber is tiltedly coupled with waveguide precision, using the electricity of niobic acid lithium material Photo effect realizes phase-modulation to by TE, TM mould optical signal of fiber waveguide.
It should be noted that in the case of not conflicting, the embodiment in this utility model and the feature in embodiment can To be mutually combined;In addition, the conventional adaptation that the function that is related to of this utility model, algorithm, method etc. are only prior art should With, therefore, this utility model, for the improvement of prior art, is substantially the annexation between hardware, rather than for function, Algorithm, method itself, although namely this utility model be related to some functions, algorithm, method, do not comprise to function, algorithm, Method itself propose improvement, this utility model for function, algorithm, method description, be to better illustrate this practicality New, in order to be better understood from this utility model.
Although this utility model have been carried out a certain degree of description it will be apparent that, without departing from spirit of the present utility model The suitable change of each condition under conditions of scope, can be carried out.It is appreciated that this utility model is not limited to described embodiment party Case, and it is attributed to the scope of claim, it includes the equivalent of each factor described.

Claims (6)

1. a kind of polarized controller being applied to distributed optical fiber vibration sensing system is it is characterised in that include light source, 1X4 Beam splitter, first annular device, the second circulator, the 3rd circulator, fourth annular device, the first photodetector, the second smooth electrical resistivity survey Survey device, the 3rd photodetector, the 4th photodetector, Polarization Controller, phase-modulator, sensing optic cable, signal processing mould Block, wherein:
Light source is connected to the first end of 1X4 beam splitter, the second end of 1X4 beam splitter respectively with first annular device, the second circulator, 3rd circulator, fourth annular device connect;
First annular device is also connected with the first photodetector, and the second circulator is also connected with the second photodetector, the 3rd ring Shape device is also connected with the 3rd photodetector, and fourth annular device is also connected with the 4th photodetector;
First photodetector, the second photodetector, the 3rd photodetector, the 4th photodetector also respectively with signal at Reason module connects;
Sensing optic cable includes the first optical fiber, the second optical fiber, and the first optical fiber is connected between first annular device and the 3rd circulator, the Two optical fiber are connected between the second circulator and fourth annular device;
Polarization Controller is connected on the first optical fiber, and Polarization Controller is also connected with signal processing module;Phase-modulator is connected On the second optical fiber, phase-modulator is also connected with signal processing module.
2. the polarized controller being applied to distributed optical fiber vibration sensing system according to claim 1, its feature exists In signal processing module includes data collecting card, computer and single-chip microcomputer, wherein:
The input of data collecting card is connected with the first photodetector, the second photodetector respectively, data collecting card defeated Go out end to be connected with computer;
Computer is also connected with single-chip microcomputer;
Single-chip microcomputer is also connected with Polarization Controller, phase-modulator respectively.
3. the polarized controller being applied to distributed optical fiber vibration sensing system according to claim 1 and 2, its feature It is, described light source is continuous mono-colour laser.
4. the polarized controller being applied to distributed optical fiber vibration sensing system according to claim 1 and 2, its feature It is, described Polarization Controller is extrusion pressing type Polarization Controller.
5. the polarized controller being applied to distributed optical fiber vibration sensing system according to claim 4, its feature exists Include in, described extrusion pressing type Polarization Controller that four direction of extrusion is at 45 °, staggered optical fiber squeezer.
6. the polarized controller being applied to distributed optical fiber vibration sensing system according to claim 1 and 2, its feature It is, described phase-modulator is Lithium metaniobate birefringent phase manipulator.
CN201620912567.0U 2016-08-19 2016-08-19 It is applied to the polarized controller of distributed optical fiber vibration sensing system Active CN206002195U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201620912567.0U CN206002195U (en) 2016-08-19 2016-08-19 It is applied to the polarized controller of distributed optical fiber vibration sensing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201620912567.0U CN206002195U (en) 2016-08-19 2016-08-19 It is applied to the polarized controller of distributed optical fiber vibration sensing system

Publications (1)

Publication Number Publication Date
CN206002195U true CN206002195U (en) 2017-03-08

Family

ID=58196515

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201620912567.0U Active CN206002195U (en) 2016-08-19 2016-08-19 It is applied to the polarized controller of distributed optical fiber vibration sensing system

Country Status (1)

Country Link
CN (1) CN206002195U (en)

Similar Documents

Publication Publication Date Title
US5015053A (en) Reduction of modulator non-linearities with independent bias angle control
US5104222A (en) System and method for minimizing input polarization-induced phase noise in an interferometric fiber-optic sensor depolarized input light
CN102510307B (en) Optical fiber disturbance system polarization control method and control system based on annealing algorithm
CN104898306A (en) MZ modulator random point bias control device and method
RU2444704C1 (en) Fibre-optic gyroscope
CN102291181A (en) Polarization control method and system of distributed optical fiber disturbance positioning system
CN103995468B (en) Polarization control method, based on genetic algorithm, of optical fiber disturbance system and device thereof
CN107560646A (en) A kind of optical fiber sensing system
CN102401666A (en) Method and device for demodulating reflection wavelength of fiber Bragg grating
CN102419435B (en) Optical detection assembly based on all-fiber bias light suppression technology and near-field signal dynamic range suppression technology in laser radar
Birch et al. Real-time optical aberration correction with a ferroelectric liquid-crystal spatial light modulator
CN111198593B (en) Super-thread photon calculation structure
GB2100855A (en) Sideband modulating/ demodulating fibre optic gyroscope
CN103792847A (en) Optical fiber disturbance polarization control device based on particle swarm optimization
CN206002195U (en) It is applied to the polarized controller of distributed optical fiber vibration sensing system
CN102624447B (en) Double-optical-path real-time control differential interference receiving device
Kyselák et al. Fiber optic polarization temperature sensor for biomedical and military security systems
CN112596252A (en) Light beam drift compensation device without mechanical structure and implementation method thereof
CN108267216A (en) Polarization state synchronous control system and method
CN101320502A (en) Optical fiber perimeter alarm method and device for implementing anti-polarization decay
CN205981244U (en) Optic fibre disturbance polarization control of system device
US5335062A (en) Apparatus for all-optical self-aligning holographic phase modulation and motion sensing and method sensing and method for sensing such phase modulation
US5495366A (en) Apparatus and method for eliminating polarization sensitivity in transducers
Spammer et al. Differentiating optical-fiber Mach–Zehnder interferometer
CN115954753A (en) Polarization-controlled laser power stability control device and method and laser emitting equipment

Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant