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Polarization-interference-based optical path difference measuring device and method of Mach-Zehnder interferometer

A technology of measuring devices and interferometers, applied in measuring devices, using optical devices to transmit sensing components, instruments, etc., can solve the problems of small broadband optical coherence length, slow response speed, complex demodulation system, etc., and achieve demodulation speed Fast, realize the effect of measurement, simple structure

Active Publication Date: 2018-10-23
TIANJIN UNIV
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Problems solved by technology

However, the broadband optical coherence length used in this type of method is small, and optical path difference matching is required to generate interference signals. The demodulation system is relatively complex and the response speed is slow.

Method used

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  • Polarization-interference-based optical path difference measuring device and method of Mach-Zehnder interferometer
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  • Polarization-interference-based optical path difference measuring device and method of Mach-Zehnder interferometer

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Embodiment 2

[0054] Embodiment 2: The specific implementation of the second optical path difference measurement method of optical fiber Mach-Zehnder interferometer based on polarization interference technology

[0055] The demodulation process of the above fiber optic Mach-Zehnder interferometer optical path difference measurement device based on polarization interference technology is as follows:

[0056] The light output by the narrow-linewidth laser light source 1 is polarized by the polarizer 2, and is divided into two beams of linearly polarized light by the polarization-maintaining coupler 4, respectively entering the two arms of the Mach-Zehnder interferometer, that is, the polarization-maintaining fiber L 2 and L 3 , and the polarization maintaining fiber L 2 and L 4 The optical axis is connected at an angle of 45°, polarization maintaining fiber L 3 and L 5 Connect at an angle of 45° so that the polarization direction of the output polarized light corresponds to the polarizati...

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Abstract

The invention discloses a polarization-interference-based optical path difference measuring device and method of a Mach-Zehnder interferometer. The measuring device is composed of a light source (1),a polarizer (2), first to sixth polarization-maintaining fibers (3) (5) (6) (7) (8) and (10), first and second polarization-maintaining couplers (4) and (9), a Wollaston prism (11), first and second photodetectors (12) and (13), a digital acquisition card (14) and a processing system (15). Light outputted by the light source (1) is polarized by the fiber polarizer (2); the light is split into twobeams of polarized light by the polarization-maintaining coupler (4); the two beams of polarized light enters the two arts, that is, the second and third polarization-maintaining fibers (5) and (6), of the Mach-Zehnder interferometer respectively, wherein the output polarization directions correspond to two groups of polarized light in quick axis and slow axis directions of the fourth and fifth polarization-maintaining fibers (7) and (8); the phase difference of the two groups of polarized light is pai / 2 by adjusting the lengths of the fourth and fifth polarization-maintaining fibers (7); anda phase is calculated by using a quadrature phase demodulation method.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a measuring device and method for optical path difference of an optical fiber Mach-Zehnder interferometer based on polarization interference technology. Background technique [0002] Optical fiber Mach-Zehnder interferometer, as a kind of optical fiber sensor, has the advantages of high sensitivity, anti-electromagnetic interference, fireproof, explosion-proof and corrosion resistance. It realizes sensing measurement by measuring the optical path difference between two paths, and is mainly used in temperature and stress sensing. ; After the polarization state is introduced, it is also commonly used to measure the electro-optical coefficient, linear polarization degree, ellipticity and other characteristics of crystals. [0003] In 2007, Tu Xiaoguang et al. (Tu Xiaoguang, Zhao Lei, Chen Ping, et al. "Electro-Optical Effect Measurement of Thin-Film Material Using PM F...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/353
CPCG01D5/35329
Inventor 王双江俊峰闪晨曦刘铁根刘琨赵梓旭
Owner TIANJIN UNIV
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