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Proceedings Paper

Demodulation of a fiber Bragg grating strain sensor by a multiwavelength fiber laser
Author(s): Shan Cong; Yunxu Sun; Yuxi Zhao; Lifeng Pan
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Paper Abstract

A fiber Bragg grating (FBG) sensors system utilizing a multi-wavelength erbium-doped fiber lasers (EDFL) with frequency shifter is proposed. The system is one fiber laser cavity with two FBG sensors as its filters. One is for strain sensing, and the other one is for temperature compensation. A frequency shifter is used to suppress the mode competition to lase two wavelengths that correspond with FBGs. The wavelength shift of the EDFL represents the sensing quantity, which is demodulated by Fiber Fabry-Perot (FFP) filter. The sensor's response to strain is measured by experiment. Because of exploiting the dual-wavelength fiber laser with a frequency shifter forming the feedback as the light source, many advantages of this system are achieved, especially high signal-to-noise ratio, high detected power, and low power consuming comparing with conventional FBG sensor system utilizing broadband light as the light source. What's more, this structure is also easy to combine with FBG array.

Paper Details

Date Published: 12 April 2012
PDF: 6 pages
Proc. SPIE 8409, Third International Conference on Smart Materials and Nanotechnology in Engineering, 84091M (12 April 2012); doi: 10.1117/12.923179
Show Author Affiliations
Shan Cong, Harbin Institute of Technology (China)
Yunxu Sun, Harbin Institute of Technology (China)
Yuxi Zhao, Harbin Institute of Technology (China)
Lifeng Pan, Harbin Institute of Technology (China)

Published in SPIE Proceedings Vol. 8409:
Third International Conference on Smart Materials and Nanotechnology in Engineering
Jinsong Leng; Yoseph Bar-Cohen; In Lee; Jian Lu, Editor(s)

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