A m-z interference optical path structure with full polarization maintaining function

Abstract

The invention provides an M-Z interface light path structure with an all polarization function. The structure comprises a polarizing beam-splitting device, a first polarization-maintaining and transferring device, a first Faraday rotator mirror, a second polarization-maintaining and transferring device, a second Faraday rotator mirror and a first polarization-maintaining coupler; the first polarization-maintaining and transferring device comprises a first port, a second port and a third port, wherein the first port receives first polarized light outputted by the polarizing beam-splitting device, the second port is connected with the first Faraday rotator mirror, and the third port is connected with a first port of the first polarization-maintaining coupler; the second polarization-maintaining and transferring device comprises a first port, a second port and a third port, wherein the first port receives second polarized light outputted by the polarizing beam-splitting device, the secondport is connected with the second Faraday rotator mirror, and the third port is connected with a second port of the first polarization-maintaining coupler. The structure is suitable for long-distancedistributed fiber sensing, such as being used in the fields of fiber communication trunk monitoring, safety monitoring of a long-distance perimeter, petroleum, natural gas pipelines and the like.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to an M-Z interference optical path structure with full polarization maintaining function. Background technique [0002] With the development of optical fiber technology, more and more application fields pay attention to optical fiber sensing technology, among which M-Z (Mach-Zehnder, Mach-Zehnder) interference structure is a common sensing technology, which is often used in optical fiber In vibration detection technology such as perimeter (references: Laser and Infrared, Zhu Yan, Dai Zhiyong, etc., Distributed Optical Fiber Vibration Sensing Technology and Development Trends, 2011,10, P1072), the specific structure is as follows figure 1 As shown, among them, L 1 and L 2 It is a single-mode fiber, and the first coupler 1 divides the light emitted by the light source into two paths, which are respectively injected into the single-mode fiber L 1 and L 2 , via single...

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Problems solved by technology

[0004] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide an M-Z interference optical path structure with full polarization-maintaining function, which is used to solve the problem that sensing cannot be realized due to the poor polarization stability caused by the polarization susceptibility of single-mode fiber question

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