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Proceedings Paper

Optical fiber core diameter mismatched in-fiber Mach-Zehnder interferometer for strain sensing
Author(s): Na Zhao; Haiwei Fu; Xueguang Qiao; Min Shao; Huidong Li; Qinpeng Liu; Hong Gao; Xu Yan; Yunshan Zhang
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Paper 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.

Paper Details

Date Published: 19 February 2015
PDF: 10 pages
Proc. SPIE 9449, The International Conference on Photonics and Optical Engineering (icPOE 2014), 94491Y (19 February 2015); doi: 10.1117/12.2075148
Show Author Affiliations
Na Zhao, Xi’an Shiyou Univ. (China)
Haiwei Fu, Xi'an Shiyou Univ. (China)
Northwest Univ. (China)
Xueguang Qiao, Northwest Univ. (China)
Min Shao, Xi'an Shiyou Univ. (China)
Northwest Univ. (China)
Huidong Li, Xi'an Shiyou Univ. (China)
Qinpeng Liu, Xi'an Shiyou Univ. (China)
Hong Gao, Xi'an Shiyou Univ. (China)
Xu Yan, Xi'an Shiyou Univ. (China)
Yunshan Zhang, Xi'an Shiyou Univ. (China)

Published in SPIE Proceedings Vol. 9449:
The International Conference on Photonics and Optical Engineering (icPOE 2014)
Ailing Tian; Anand Asundi; Weiguo Liu; Chunmin Zhang, Editor(s)

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