Optical fiber core diameter mismatched in-fiber Mach-Zehnder interferometer for strain sensing

Na Zhao; Haiwei Fu; Xueguang Qiao; Min Shao; Huidong Li; Qinpeng Liu; Hong Gao; Xu Yan; Yunshan Zhang

doi:10.1117/12.2075148

19 February 2015 Optical fiber core diameter mismatched in-fiber Mach-Zehnder interferometer for strain sensing

Na Zhao, Haiwei Fu, Xueguang Qiao, Min Shao, Huidong Li, Qinpeng Liu, Hong Gao, Xu Yan, Yunshan Zhang

Proceedings Volume 9449, The International Conference on Photonics and Optical Engineering (icPOE 2014); 94491Y (2015) https://doi.org/10.1117/12.2075148
Event: The International Conference on Photonics and Optical Engineering and the Annual West China Photonics Conference (icPOE 2014), 2014, Xi'an, China

Abstract

A novel strain sensor based on in-fiber Mach-Zehnder interferometer (MZI) is proposed in this paper. The sensor is with the structure of single mode-thin core-multimode-thin core-single mode (STMTS) fiber structures fabricated by splicing two short sections of thin core fiber (TCF) among lead-in single mode fiber (SMF), multi-mode fiber (MMF) and lead-out SMF. The first section of TCF excites the core mode and high-order modes in the core of MMF and the second section of TCF couples the core mode and high-order modes into lead-out SMF to procedure inter-modes interferences. The sensor with MMF length of 20mm and TCFs length of 1mm is fabricated. The transmission spectrum of the sensor with respect to external strain has been studied by experiment. The result shows that the central wavelength respects to external strain with a good linearity. The strain sensitivity of the sensor is -2 pm/ue; over a strain range of 0 to 4500ue;. The temperature response of the sensor is also studied by experiment. The results indicate that the central wavelength of the transmission spectrum is insensitive to external temperature change. The proposed sensor features the advantages of easy fabrication, low cost and high sensitivity, and it exhibits great potential in single parameter measurement.

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Na Zhao, Haiwei Fu, Xueguang Qiao, Min Shao, Huidong Li, Qinpeng Liu, Hong Gao, Xu Yan, and Yunshan Zhang "Optical fiber core diameter mismatched in-fiber Mach-Zehnder interferometer for strain sensing", Proc. SPIE 9449, The International Conference on Photonics and Optical Engineering (icPOE 2014), 94491Y (19 February 2015); https://doi.org/10.1117/12.2075148

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KEYWORDS

Sensors

Single mode fibers

Fiber optics sensors

Structured optical fibers

Mach-Zehnder interferometers

Optical fibers

Photonic crystal fibers

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