Polarization-dependent embedded fiber M-Z interference type transverse pressure transducer

Abstract

The invention relates to a polarization-dependent embedded fiber M-Z interference type transverse pressure transducer. The pressure transducer is characterized by including an ASE light source (1), a polarization controller (2), a first single-mode fiber (3), a polarization maintaining fiber (4), a second single-mode fiber (5) and a spectrum analyzer (6), wherein the first single-mode fiber (3) and the polarization maintaining fiber (4) are welded in a fiber core staggering manner, and the staggering welding direction of the first single-mode fiber (3) and the polarization maintaining fiber (4) is along the included angle bisector direction of fast and slow axes of the polarization maintaining fiber (4); the polarization maintaining fiber (4) and the second single-mode fiber (5) are welded in a fiber core staggering manner, and the staggering welding direction of the second single-mode fiber (5) and the polarization maintaining fiber (4) is along the included angle bisector direction of fast and slow axes of the polarization maintaining fiber (4); the first single-mode fiber (3) and the second single-mode fiber (5) are symmetrical with respect to the polarization maintaining fiber (4); and the other end of the second single-mode fiber (5) is connected with the spectrum analyzer (6), and transverse pressure is applied to the polarization maintaining fiber (4). The pressure transducer provided by the invention has the characteristics of high linearity, low cost, small size and the like, and can be used for measurement of tiny pressure.

Description

technical field [0001] The invention provides a polarization-dependent embedded optical fiber M-Z interference type lateral pressure sensor, which belongs to the technical field of optical fiber sensing. Background technique [0002] The embedded polarization-maintaining fiber Mach-Zehnder interferometer can effectively reduce polarization fading. Due to the specific polarization-mode transmission characteristics of polarization-maintaining fiber, the application in coherent optical communication, fiber optic sensing and other fields has attracted more and more attention. When the polarization-maintaining fiber is slightly disturbed by the external transverse pressure, the energy coupling of the two orthogonal polarization fundamental modes at the disturbed place will be caused, thereby deteriorating the polarization-maintaining property of the polarization-maintaining fiber. Contents of the invention [0003] The object of the present invention is to provide a polarizatio...

AI Technical Summary

Problems solved by technology

When the polarization-maintaining fiber is slightly disturbed by the external lateral pressure, it will cause the energy coupling of the two orthogonal polarization fundamental modes at the disturbed place, thus deteriorating the polarization-maintaining property of the polarization-maintaining fiber

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