Journal
OPTICAL FIBER TECHNOLOGY
Volume 15, Issue 2, Pages 165-171Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.yofte.2008.09.005
Keywords
Faraday effect; Fiber Bragg grating; Photonic bandgap; Magneto-optical sensor; Nonlinear coupled-mode equations
Funding
- National Natural Science Foundation of China [60671027]
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The characteristics of photonic bandgaps and the transmission/reflection of guided optical waves in the magneto-optic fiber Bragg grating (MFBG) are theoretically investigated for the first time. The polarization-mode conversion resulting from the Faraday effect may change the width of the pure bandgap, or even lead to a couple of photonic semitransparent frequency band (STB) for sufficiently large magneto-optical-to-grating coupling ratio (MGR). Within the STBs, the transmittivity and reflectivity are equal and then the MFBG can serve as a 3 dB light beam splitter. Based on the sensitivity of MFBG spectral lines to the magneto-optic (MO) coupling coefficient, a novel high-resolution magnetic field sensor capable of up to 0.01 nm/(kA/m) is predicted. According to the dependency of nonlinear transmission or reflection on the MO effects, a new class of MFBG-based nonlinear optical switches under an appropriate MO bias may also be achieved with applications to flexible and controllable optical signal processing. (C) 2008 Elsevier Inc. All rights reserved.
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