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Distributed single core feedback interference optical path structure having low background light

A single-core feedback, low background light technology, applied in the direction of reducing unwanted effects, to achieve the effect of improved precision, high fringe definition, and low background light

Active Publication Date: 2012-06-27
FUDAN UNIV
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  • Abstract
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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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  • Distributed single core feedback interference optical path structure having low background light
  • Distributed single core feedback interference optical path structure having low background light
  • Distributed single core feedback interference optical path structure having low background light

Examples

Experimental program
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Embodiment Construction

[0040] The present invention will be specifically described below through examples.

[0041] The interference optical path of this embodiment adopts Figure 4 structure shown.

[0042] 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.

[0043] 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.

[0044] 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...

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Abstract

The invention, which belongs to the optical fiber sensing technology field, particularly relates to a distributed single core feedback interference optical path structure having low background light. According to the structure, a wave combination port of a polarization beam splitter is utilized as an interface of a distributed sensing optical fiber as well as a faraday rotating mirror that is used at an end of the sensing optical fiber is also cooperatively utilized, so that light that is returned along a same way is eliminated, a coherent light component in an interference optical path is improved and strip sharpness is enhanced. Besides, an application advantage in a traditional single core feedback sensing structure is preserved; and the sensing function can be realized only by using a common fiber in optical fiber communication. The distributed single core feedback interference optical path structure provided in the invention is especially suitable for long-distance line monitoring including security monitoring of communication trunk and a gas pipeline and the like.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a distributed single-core feedback interference optical path structure. 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 as the sensing fiber and is easy to imple...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D3/028
Inventor 贾波肖倩洪广伟唐璜
Owner FUDAN UNIV
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