Polarization control method, based on genetic algorithm, of optical fiber disturbance system and device thereof

A polarization control and genetic algorithm technology, applied in the field of sensing and detection, can solve the problems of reduced visibility of interference fringes, reduced perturbation positioning accuracy, degradation of linear polarization polarization state, etc., so as to solve the problem of false convergence and eliminate the influence of perturbation positioning accuracy. , the effect of high convergence speed

Active Publication Date: 2014-08-20
TIANJIN UNIV
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Problems solved by technology

The fiber used in the actual disturbance system is a common single-mode fiber. Due to the birefringence characteristics of the single-mode fiber, the polarization state of the light wave will change after entering the fiber, resulting in the degradation of the polarization state of the linearly polarized light.
In the field of sensing, this will reduce the visibility of interference fringes, or even disappear, so that the system's positioning accuracy for disturbances will be greatly reduced
[0004] Although the polarization-maintaining fiber can keep the polarization state of the light unchanged, since the optical fiber laying distance of the distributed fiber-optic vibration sensing system is generally tens of kilometers, the use of polarization-maintaining fiber will make the system cost too high

Method used

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  • Polarization control method, based on genetic algorithm, of optical fiber disturbance system and device thereof
  • Polarization control method, based on genetic algorithm, of optical fiber disturbance system and device thereof
  • Polarization control method, based on genetic algorithm, of optical fiber disturbance system and device thereof

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Embodiment 1

[0064] Embodiment 1: Polarization control device used in distributed optical fiber disturbance location system

[0065] Such as Figure 5 As shown, the polarization control device includes a basic distributed optical fiber sensor based on a dual Mach-Zehnder fiber interferometer, and the basic distributed optical fiber sensor includes: a laser 9, a first coupler 10, a second coupler 13 and a third The coupler 14, the first optical circulator 11 and the second optical circulator 12, the sensing optical cable 17, the first photodetector 18a and the second photodetector 18b are provided on one sensing fiber of the sensing optical cable 17 A polarization controller 15 is extruded, and a lithium niobate birefringent phase modulator 16 is provided on the other sensing fiber;

[0066]The extruded polarization controller 15: has four optical fiber extruders arranged staggeredly at 45° in extruding directions, the first two optical extruders are used in the control process, and differ...

Embodiment 2

[0071] Embodiment 2: Polarization control method

[0072] One of the important conditions for two beams of light to interfere is that the light participating in the interference is linearly polarized and has the same polarization direction. The positioning algorithm of the distributed optical fiber disturbance location system is based on the assumption that linearly polarized light interferes with the same polarization direction. Distributed optical fiber disturbance positioning system is mainly used for perimeter protection, earthquake monitoring, etc. The optical fiber used is tens of kilometers or even hundreds of kilometers long. If the polarization maintaining optical fiber and its corresponding supporting components are used, it will be very expensive. Considering the cost, the system The sensing fibers used are all commonly used single-mode fibers. Ordinary single-mode fiber due to random factors such as geometric bending, ambient temperature changes, and other non-rand...

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Abstract

The invention discloses a polarization control method, based on the genetic algorithm, of a distributed optical fiber disturbance positioning system. In the polarization control process, the genetic algorithm is adopted as a control algorithm, and an extrusion-type polarization controller is adopted to modulate the polarization state of interference optical waves; with the relevancy of two interference signals received by a detector in the distributed optical fiber disturbance positioning system as a feedback signal, the impressed voltage value, corresponding to the maximum relevancy of two interference signals, of the extrusion-type polarization controller is searched for according to the genetic algorithm. A polarization control system comprises a distributed optical fiber disturbance sensing system based on the dual Mach-Zehnder interferometer principle, the extrusion-type polarization controller, a lithium niobate birefringence phase modulator, a single-chip microcomputer system and a computer. According to the polarization control method of the distributed optical fiber disturbance positioning system, the polarization-induced fading resistance of the system can be effectively improved by adjusting the polarization state of interference light, and the influence of birefringence of single-mode optical fibers on the positioning precision of the system can be eliminated to a great extent.

Description

technical field [0001] The invention belongs to the technical field of sensing and detection, in particular to a polarization control system of an optical fiber perturbation system. Background technique [0002] With the development of science and technology and the enhancement of people's security awareness, it has become a necessary and urgent problem to develop a perimeter security system with large detection range, low energy consumption and low cost. Due to its high sensitivity, anti-electromagnetic interference, and no power supply, the distributed optical fiber vibration sensing system has been widely used in military defense, financial protection, energy security, community security and other security fields, and will have a wide range of applications in the future. application prospects. [0003] One of the necessary conditions for light waves to interfere is that the light vectors participating in the interference have the same vibration direction, that is, they h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
Inventor 刘琨刘铁根陈沁楠江俊峰丁振扬潘亮李玉马春宇
Owner TIANJIN UNIV
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