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Proceedings Paper

An in-fiber refractometer based on asymmetrical twin-core fiber
Author(s): Yanhui Zhang; Ai Zhou; Guangping Li
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Paper Abstract

We demonstrate a compact fiber Michelson interferometer for refractive index (RI) sensing which is composed of an asymmetrical twin-core fiber (TCF) with a central core and a side core. By chemical etching a segment of the TCF to make the side core is nearly exposed, the effective RI of the side core mode is sensitive to the RI change of the external medium. Therefore, the optical path length difference between the central and side cores will vary with the ambient refractive index, which leads to a shift of the transmission spectrum of the Michelson interferometer. The experimental results show that the device has a refractive index resolution of ~10-5 in the range of 1.34-1.38.

Paper Details

Date Published: 22 November 2011
PDF: 7 pages
Proc. SPIE 8199, 2011 International Conference on Optical Instruments and Technology: Optical Sensors and Applications, 819912 (22 November 2011); doi: 10.1117/12.905007
Show Author Affiliations
Yanhui Zhang, Harbin Engineering Univ. (China)
Ai Zhou, Harbin Engineering Univ. (China)
Guangping Li, Harbin Engineering Univ. (China)


Published in SPIE Proceedings Vol. 8199:
2011 International Conference on Optical Instruments and Technology: Optical Sensors and Applications
Brian Culshaw; YanBiao Liao; Anbo Wang; Xiaoyi Bao; Xudong Fan, Editor(s)

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