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Method for eliminating reverse return light in distributed single-core feedback interference light path

A single-core feedback and interference light technology, which is applied in the direction of measuring devices, instruments, special recording/indicating devices, etc., to achieve the effects of low background light, improved precision, and high fringe definition

Active Publication Date: 2012-06-27
FUDAN UNIV
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Problems solved by technology

However, this delay line configuration method also introduces two non-interfering back reflections that do not exist in the original Sagnac ring.

Method used

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  • Method for eliminating reverse return light in distributed single-core feedback interference light path
  • Method for eliminating reverse return light in distributed single-core feedback interference light path
  • Method for eliminating reverse return light in distributed single-core feedback interference light path

Examples

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Embodiment Construction

[0039] The present invention will be specifically described below through examples.

[0040] The optical path of this embodiment adopts Figure 4 structure shown.

[0041] The fiber coupler 12 used a 3*3 split coupler, which was produced by the Wuhan Institute of Posts and Telecommunications; the first delay fiber 16 was an optical fiber loop made by G652 Corning single-mode fiber; the first polarization beam splitter 13 The pigtails are all ordinary single-mode optical fibers produced by Mianyang Chaoguang.

[0042] The sensing fiber 15 is a core single-mode fiber in the optical cable to be monitored, with a length of about 30 km, one end of which is connected to the first polarization beam splitter 13, and the other end is connected to the Faraday rotating mirror.

[0043] The light of the interference optical path is input from the port 12a1 of the fiber coupler 12, and the interference signals are obtained from the ports 12a2 and 12a3. The light source used is the SO3-B...

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Abstract

The invention belongs to the technical field of optical fiber sensing and in particular relates to a method for eliminating reverse return light in a distributed single-core feedback interference light path. According to the method, a polarization beam splitter, a Faraday rotary reflector and an optical fiber delayer are used in a polarized light path to form a single-core feedback interference light path, wherein a wave combining end of the polarization beam splitter is connected with one end of a sensing optical fiber; the other end of the sensing optical fiber is connected with the Faraday rotary reflector; in the optical fiber delayer, a delay optical fiber or the polarization beam splitter, the delay optical fiber and the Faraday rotary reflector are used to form a delay device; and a wave combining port of the polarization beam splitter is used as an interface of a distributed sensing optical fiber to cooperate with the Faraday rotary reflector which is used at the tail end of the sensing optical fiber so as to eliminate the light which returns along the original path in the light path, increase coherent light components in the interference light path and improve the definition of stripes. The method is particularly suitable for long-distance line monitoring such as security monitoring of communication main lines, oil-gas pipelines and the like.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a method for eliminating back-reflecting light in a distributed single-core feedback interference optical path. Background technique [0002] In the contemporary society with the rapid development of science and technology, the development of optical fiber communication technology has brought about a revolution in sensing technology. Important application areas, among which distributed optical fiber sensing has a long monitoring distance, high sensitivity, and strong environmental adaptability, especially in areas related to the national economy and people's livelihood, such as tunnel fire monitoring, optical cable safety monitoring, oil and gas leakage monitoring, etc. attention and application. Distributed single-core feedback interference structure has become an important technical branch in distributed sensing because it only needs to use one core a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D3/036
Inventor 贾波肖倩洪广伟唐璜
Owner FUDAN UNIV
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