Research on fiber sensor demodulating technique using tilted fiber Bragg gratings

Yinping Miao; Bo Liu; Weihua Zhang; Qida Zhao

doi:10.1117/12.802822

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11 November 2008 Research on fiber sensor demodulating technique using tilted fiber Bragg gratings

Yinping Miao, Bo Liu, Weihua Zhang, Qida Zhao

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Proceedings Volume 7134, Passive Components and Fiber-based Devices V; 71340P (2008) https://doi.org/10.1117/12.802822
Event: Asia-Pacific Optical Communications, 2008, Hangzhou, China

Abstract

Tilted fibre Bragg grating (TFBG) belongs to short-period gratings family; there is core mode and a lot of cladding modes in the transmission spectrum. According to the special structure and coupling characteristic of the TFBG, we propose a novel method of edge filter linear demodulation using tilted fiber Bragg gratings in a fiber sensor system. The results show that the widely linear range of katabatic edge (1505nm~1535nm) and an assurgent edge (1545nm~1565nm) can be used in edge filtering; the thermal characteristic of the core mode and cladding modes is similar to FBG's. Therefore, it can compensate dynamically the temperature shift of the FBG and the effect of temperature noise on the strain or other sensing signals is eliminated. The advantages of this simple system are an all-fiber design, quasi static and dynamic operation, high stability and lower cost.

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Yinping Miao, Bo Liu, Weihua Zhang, and Qida Zhao "Research on fiber sensor demodulating technique using tilted fiber Bragg gratings", Proc. SPIE 7134, Passive Components and Fiber-based Devices V, 71340P (11 November 2008); https://doi.org/10.1117/12.802822

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