A Polarization-Dependent Embedded Optical Fiber m-z Interferometric Transverse Pressure Sensor

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-related embedded optical fiber M-Z interference type lateral pressure sensor, which belongs to the technical field of optical fiber sensing. Background technique [0002] The built-in polarization-maintaining fiber Mach-Zehnder interferometer can effectively reduce the polarization fading. Due to the specific polarization mode transmission characteristics of the polarization-maintaining fiber, its applications in the fields of coherent optical communication and fiber sensing are more and more attractive. When the polarization-maintaining fiber is slightly disturbed by the external lateral pressure, it will cause the energy coupling between the two orthogonal polarization fundamental modes at the disturbed place, which will make the polarization-maintaining performance of the polarization-maintaining fiber worse. Summary of the invention [0003] The purpose of the present invention is to provide a polarization-dependent ...

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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