Novel method for the demodulation of wavelength shift of fiber Bragg gratings

Xiaopeng Dong; Beatrice C.B. Chu; Benshun Yi; K. S. Chiang

doi:10.1117/12.444886

19 October 2001 Novel method for the demodulation of wavelength shift of fiber Bragg gratings

Xiaopeng Dong, Beatrice C.B. Chu, Benshun Yi, K. S. Chiang

Proceedings Volume 4579, Optical Fiber and Planar Waveguide Technology; (2001) https://doi.org/10.1117/12.444886
Event: Asia-Pacific Optical and Wireless Communications Conference and Exhibit, 2001, Beijing, China

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.

Citation Download Citation

Xiaopeng Dong, Beatrice C.B. Chu, Benshun Yi, and K. S. Chiang "Novel method for the demodulation of wavelength shift of fiber Bragg gratings", Proc. SPIE 4579, Optical Fiber and Planar Waveguide Technology, (19 October 2001); https://doi.org/10.1117/12.444886

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