Demodulation of a fiber Bragg grating strain sensor by a multiwavelength fiber laser

Shan Cong; Yunxu Sun; Yuxi Zhao; Lifeng Pan

doi:10.1117/12.923179

12 April 2012 Demodulation of a fiber Bragg grating strain sensor by a multiwavelength fiber laser

Shan Cong, Yunxu Sun, Yuxi Zhao, Lifeng Pan

Proceedings Volume 8409, Third International Conference on Smart Materials and Nanotechnology in Engineering; 84091M (2012) https://doi.org/10.1117/12.923179
Event: Third International Conference on Smart Materials and Nanotechnology in Engineering, 2011, Shenzhen, China

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.

Citation Download Citation

Shan Cong, Yunxu Sun, Yuxi Zhao, and Lifeng Pan "Demodulation of a fiber Bragg grating strain sensor by a multiwavelength fiber laser", Proc. SPIE 8409, Third International Conference on Smart Materials and Nanotechnology in Engineering, 84091M (12 April 2012); https://doi.org/10.1117/12.923179

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