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Optical Engineering

Analysis of polarization states in magneto-optic fiber Bragg gratings based on a nonmagnetic equivalent model
Author(s): Baojian Wu; Xiaojing Zhou; Kun Qui
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Paper Abstract

According to the magneto-optic coupling characteristics of magneto-optic fiber Bragg gratings (MFBGs), we present a nonmagnetic equivalent model of a uniformly magnetized MFBG to analyze the optical polarization states output from the MFBG for incident linearly polarized light. The Faraday rotation of transmitted light is enhanced at the edges of a grating bandgap, and then can be applied to the measurement of a magnetic field by employing the wavelength speeding method. The use of apodized MFBGs helps to simultaneously achieve a good linear magnetic field response and extremely small fluctuation of transmittivity. For a typical paramagnetic terbium-doped and apodized MFBG, the temperature coefficient of the Faraday rotation is calculated to be −2.5×10−4 m/K.

Paper Details

Date Published: 1 September 2010
PDF: 5 pages
Opt. Eng. 49(9) 094401 doi: 10.1117/1.3484951
Published in: Optical Engineering Volume 49, Issue 9
Show Author Affiliations
Baojian Wu, Univ. of Electronic Science and Technology of China (China)
Xiaojing Zhou, Univ. of Electronic Science and Technology of China (China)
Kun Qui, Univ. of Electronic Science and Technology of China (China)

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