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Proceedings Paper

Refractive index insensitive temperature sensor based on coaxial waveguide fiber modal interferometer
Author(s): Ai Zhou; Quan Xu; Tuo Zheng; Jun Yang; Yuanyuan Yang; Libo Yuan
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Paper Abstract

A refractive index insensitive temperature sensor based on coaxial dual-waveguide optical fiber was proposed and demonstrated. The coaxial fiber contains a central core along the fiber axis and an annular core between the inner/outer claddings. By inserting the coaxial fiber in between two single mode fibers through core-offset splicing, cladding modes are excited at the splice point and therefore a modal Mach-Zehnder interferometer is achieved. The effective refractive index of the inner cladding mode is independent of the external refractive index due to the existence of the annular core. Owing to the large thermo-optic coefficient difference between the coaxial fiber's core and cladding, the modal interferometer has high temperature sensitivity. Such an interferometer is extremely suitable for temperature measurement in wet or liquid environment.

Paper Details

Date Published: 15 October 2013
PDF: 4 pages
Proc. SPIE 8924, Fourth Asia Pacific Optical Sensors Conference, 89240A (15 October 2013); doi: 10.1117/12.2034083
Show Author Affiliations
Ai Zhou, Harbin Engineering Univ. (China)
Quan Xu, Harbin Engineering Univ. (China)
Tuo Zheng, Harbin Engineering Univ. (China)
Jun Yang, Harbin Engineering Univ. (China)
Yuanyuan Yang, Harbin Engineering Univ. (China)
Libo Yuan, Harbin Engineering Univ. (China)

Published in SPIE Proceedings Vol. 8924:
Fourth Asia Pacific Optical Sensors Conference
Minghong Yang; Dongning Wang; Yun-Jiang Rao, Editor(s)

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