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Distributed type optic fiber vibration-sensing polarization control system

A distributed optical fiber and control system technology, applied in the field of sensing, can solve problems such as polarization fading in optical fiber sensing systems, achieve the effects of solving polarization fading problems, simplifying the polarization control process, and quickly achieving polarization stabilization

Active Publication Date: 2014-11-19
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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Problems solved by technology

[0004] The purpose of the present invention is to solve the polarization fading problem of the existing distributed optical fiber sensing system based on double M-Z interference technology, and to provide a polarization control system based on sensitive channel selection and control

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  • Distributed type optic fiber vibration-sensing polarization control system
  • Distributed type optic fiber vibration-sensing polarization control system
  • Distributed type optic fiber vibration-sensing polarization control system

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Embodiment Construction

[0018] In order to make the purpose of the embodiments of the present invention and the technical solutions more clearly expressed, the embodiments of the present invention will be further described below in conjunction with the drawings and specific examples.

[0019] Such as figure 1 As shown, a distributed optical fiber vibration sensing polarization control system includes a narrow linewidth laser 1, an optical amplifier 2, an optical splitter 3, a first polarization processor 4, a second polarization processor 5, and a first coupler 6. A second coupler 7 , a first photodetector 8 , a second photodetector 9 and a polarization control unit 10 . Example by figure 1 Connect the lines.

[0020] Narrow linewidth laser 1 is used as the system light source to emit narrow linewidth signal light; optical amplifier 2 is used to amplify narrow linewidth signal light so that the intensity of the amplified optical signal meets the system requirements; optical splitter 3 completes Th...

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Abstract

The invention discloses a distributed type optic fiber vibration-sensing polarization control system. In the polarization state control of a sensing system, a sensing channel selection and control method of polarization processors is adopted for controlling the optic wave polarization state of the sensing system by the polarization processors. One of two paths of signals outputted by the sensing system is used as a reference signal, the visibility of the reference signal is used as a feedback signal of the first polarization processor, the correlation of the two paths of signals is used as a feedback signal of the second polarization processor, and the polarization state control of the system is completed by selecting the sensing channels of the polarization processors and applying a control signal to the channels. The polarization control system comprises a power source, the polarization processors, a polarization control unit, and an optic fiber interferometer based on a dual-Mach-Zehnder mechanism. The polarization control system has the advantage that by adjusting the polarization states of the two paths of input optic waves, the anti-polarization attenuation capability of the system is improved, and the implementation of the system positioning precision index is ensured.

Description

technical field [0001] The invention belongs to the field of sensing, and relates to a distributed optical fiber vibration sensing polarization control system, in particular to a polarization control system based on sensitive channel selection and control. Background technique [0002] It is of great practical significance to discover and locate the intrusion behavior in time in the modern security defense system. Traditional security systems mainly include camera video recognition, infrared sensors, and geomagnetic sensors. These detection methods are limited by equipment power supply, short monitoring distance, weak anti-electromagnetic interference ability, and high maintenance cost. The distributed optical fiber vibration sensing system can measure the vibration information of the entire optical fiber length with time. It has the advantages of long detection distance, strong anti-electromagnetic interference ability, and easy maintenance after installation. It has becom...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H9/00
Inventor 王延穆立波刘斌禄姚剑段汉卿李新欣
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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