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Proceedings Paper

Torsion sensors based on the fiber optic Malus Fabry-Perot interferometer
Author(s): Gilberto Basilio-Sánchez; Juan Hernández-Cordero
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Paper Abstract

The combination of a Malus and Fabry-Perot interferometers using fiber optic devices has been proven useful to achieve an enhancement in sensitivity to measure changes in circular birefringence. This fiber optic Malus Fabry-Perot interferometer (FOMFPI) allows for the sensitive detection of changes in the polarization of the guided beam due to torsion applied to the fiber, owing to multiple passes of the beam through the sensing area. We present a theoretical analysis based on Jones calculus showing that it is possible to measure variations in circular birefringence of the fiber upon registering changes in the transmission through this arrangement. The matrix representation developed for the FOMFPI allows for the evaluation of its performance as a function of parameters such as mirror reflectivity and intra-cavity losses. Experimental results using both, bulk optical components and optical fibers, show that compared to single-pass polarimeter measurements, enhancement in sensitivity is effectively achieved. The dependence of the enhancement factor on the reflectivity of the mirrors is evaluated upon using mirrors with variable reflection coefficient. The performance of FOMFPIs using multimode and single-mode fibers is also investigated.

Paper Details

Date Published: 16 November 2004
PDF: 10 pages
Proc. SPIE 5579, Photonics North 2004: Photonic Applications in Telecommunications, Sensors, Software, and Lasers, (16 November 2004); doi: 10.1117/12.567557
Show Author Affiliations
Gilberto Basilio-Sánchez, Univ. Nacional Autónoma de México (Mexico)
Juan Hernández-Cordero, Univ. Nacional Autónoma de México (Mexico)


Published in SPIE Proceedings Vol. 5579:
Photonics North 2004: Photonic Applications in Telecommunications, Sensors, Software, and Lasers
Donna Strickland; Trevor J. Hall; Stoyan Tanev; Xiaoyi Bao; Franko Kueppers; David V. Plant, Editor(s)

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