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Proceedings Paper

Bending sensor with tilted fiber Bragg grating interacting with multimode fiber
Author(s): Yongxing Jin; Chi Chiu Chan; Xinyong Dong; Y. F. Zhang
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Paper Abstract

A new type fiber bending sensor based on a tilted fiber Bragg grating (TFBG) interacting with a multimode fiber (MMF) is presented. The sensing head is formed by insertion of a small section of MMF between single-mode fiber (SMF) and the TFBG. The reflection light from this sensor head includes two parts, i.e., the reflected Bragg mode and cladding modes. The latter were first coupled from the core mode to counter-propagating cladding modes by the TFBG and then coupled back into the core as a function of the MMF. The power of the cladding modes changes as the fiber is bent while the Bragg one keeps unchanged. The average reflective power in the cladding modes decreased with the increase of curvature. The measurement range of the curvature from 0m-1 to 2.5m-1 with a measurement sensitivity of -802.4nW/m-1 is achieved.

Paper Details

Date Published: 1 December 2009
PDF: 6 pages
Proc. SPIE 7630, Passive Components and Fiber-based Devices VI, 76302E (1 December 2009); doi: 10.1117/12.853060
Show Author Affiliations
Yongxing Jin, China Jiliang Univ. (China)
Chi Chiu Chan, Nanyang Technological Univ. (Singapore)
Xinyong Dong, China Jiliang Univ. (China)
Y. F. Zhang, Nanyang Technological Univ. (Singapore)

Published in SPIE Proceedings Vol. 7630:
Passive Components and Fiber-based Devices VI
Perry P. Shum, Editor(s)

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