A fiber Bragg grating demodulation system using high-birefringence fiber loop mirror

Shuyang Hu; Chuan He; Dong-mei Bai

doi:10.1117/12.2072595

3 December 2014 A fiber Bragg grating demodulation system using high-birefringence fiber loop mirror

Shuyang Hu, Chuan He, Dong-mei Bai

Proceedings Volume 9297, International Symposium on Optoelectronic Technology and Application 2014: Laser and Optical Measurement Technology; and Fiber Optic Sensors; 929730 (2014) https://doi.org/10.1117/12.2072595
Event: International Symposium on Optoelectronic Technology and Application 2014, 2014, Beijing, China

Abstract

In this paper, a fiber Bragg grating (FBG) demodulation system based on high-birefringence fiber loop mirror (Hi-Bi FLM) is proposed and demonstrated. The approximate linear edge of the transmittance of the Hi-Bi FLM, which is a sinusoidal function of wavelength, is used to interrogate the sensing FBGs. The relationship between the wavelength period of the transmittance of the Hi-Bi FLM and the length of Hi-Bi fiber is studied and the results shows that the linear range of Hi-Bi FLM is in Inverse proportion to the length of the Hi-Bi fiber. To get wider linear range, the length of the Hi-Bi fiber must be shorter and it is limited by the fiber fusing technic. Two sections of Hi-Bi fiber is orthogonal fused and its effect is equal to one segment of fiber whose length is equal to the difference of that of the two section of fibers. Using this method, a Hi-Bi FLM with a wide linear range of 20nm is made and used to demodulate FBG sensing signal. The demodulator has advantages of all-fiber design, low price and high speed.

Citation Download Citation

Shuyang Hu, Chuan He, and Dong-mei Bai "A fiber Bragg grating demodulation system using high-birefringence fiber loop mirror", Proc. SPIE 9297, International Symposium on Optoelectronic Technology and Application 2014: Laser and Optical Measurement Technology; and Fiber Optic Sensors, 929730 (3 December 2014); https://doi.org/10.1117/12.2072595

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