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Proceedings Paper

Novel method for the demodulation of wavelength shift of fiber Bragg gratings
Author(s): Xiaopeng Dong; Beatrice C.B. Chu; Benshun Yi; K. S. Chiang
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Paper Abstract

A novel method to detect the small wavelength shift of the fiber Bragg grating used in an electric current sensor with a comb-like fiber filter is proposed in this paper. The wavelength filter was constructed by joining a piece of hi-bi fiber in the loop of a normal fiber Sagnac interferometer, which may result to a periodically varied spectrum in the reflection or transmission light. Therefore the small wavelength shift of the fiber grating caused by the change of the applied magnetic field can be detected by monitoring the intensity of the light traveling through the comb-like filter. With a 0.8-nm spacing filter used in the measurement, a sensitivity better than 0.01 nm for the Bragg wavelength shift of the fiber grating (limited by the noise of the electronic circuit and detection instruments) was obtained in the experiment. The proposed demodulation scheme provides a new approach to the detection of small wavelength shift of fiber grating.

Paper Details

Date Published: 19 October 2001
PDF: 4 pages
Proc. SPIE 4579, Optical Fiber and Planar Waveguide Technology, (19 October 2001); doi: 10.1117/12.444886
Show Author Affiliations
Xiaopeng Dong, Xiamen Univ. (China)
Beatrice C.B. Chu, City Univ. of Hong Kong (Hong Kong)
Benshun Yi, City Univ. of Hong Kong (Hong Kong)
K. S. Chiang, City Univ. of Hong Kong (Hong Kong)


Published in SPIE Proceedings Vol. 4579:
Optical Fiber and Planar Waveguide Technology
Shuisheng Jian; Yanming Liu, Editor(s)

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