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Proceedings Paper

A polarization-insensitive fiber optic sensor based on Faraday rotator mirror
Author(s): Ya-bin Zhang; Xin-tong Sun; Chao Cai; Chao Zhang
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Paper Abstract

Fiber-optic sensors are widely used and researched in-depth. Interferometric fiber optic sensor is an important category of fiber optic sensor because of its high sensitivity. However, polarization-induced fading phenomena always appear in the output of sensors which constructed of low-birefringence single mode fibers. In this paper, we firstly give the structure of a fiber-optic sensor based on M-Z fiber optic interferometer. And we use polarization optics to study the light state in this sensor. Taking the polarization state of input light in fiber-optic interferometer is random we calculate the Jones vector of the output light. To study the polarization fading phenomena we calculate the intensity of output light. We caculate the degree of polarization fading by computer software. The result shows that sensing signal will completely vanish. Thus we can't get steady sensing signal and we must use depolarization fading technology. We give a simple structure of a polarizationinsensitive optical fiber sensor. Two Faraday rotator mirrors (FRM) are added into Michelson optical fiber interferometer to improve the visibility. We also use polarization optics to study the output light of this structrue. Theoretical analysis and experimental study indicates that this convenient method can improve visibility to 1. The feature of the method is convenient, accuracy and practical. And it can apply to various kinds of complex construction.

Paper Details

Date Published: 8 September 2011
PDF: 4 pages
Proc. SPIE 8191, International Symposium on Photoelectronic Detection and Imaging 2011: Sensor and Micromachined Optical Device Technologies, 81911V (8 September 2011); doi: 10.1117/12.900880
Show Author Affiliations
Ya-bin Zhang, Harbin Engineering Univ. (China)
Xin-tong Sun, Harbin Engineering Univ. (China)
Chao Cai, Harbin Engineering Univ. (China)
Chao Zhang, Harbin Engineering Univ. (China)

Published in SPIE Proceedings Vol. 8191:
International Symposium on Photoelectronic Detection and Imaging 2011: Sensor and Micromachined Optical Device Technologies
Yuelin Wang; Huikai Xie; Yufeng Jin, Editor(s)

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