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[摘要]：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 X 10(-4) m/K. (C) 2010 Society of Photo-Optical Instrumentation Engineers. [DOI: 10.1117/1.3484951] |
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