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Temperature-Insensitivity Bending Sensor Based on Cladding-Mode Resonance of Special Optical Fiber

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7 Author(s)
Fufei Pang ; Key Lab. of Specialty Fiber Opt. & Opt. Access Network, Shanghai Univ., Shanghai ; Wenbin Liang ; Wenchao Xiang ; Na Chen
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A temperature-insensitive fiber bending sensor is demonstrated by using a special optical fiber with cladding-mode resonance. The special fiber with a pure silica core and a fluorine-doped silica inner cladding shows strong cladding-mode resonance. The single-mode fiber (SMF)-special fiber-SMF is proposed as a sensor head to monitor the cladding-mode resonance. The response of the resonant spectrum exhibits high sensitivity to bending curvature and inherent insensitivity to temperature. The proposed special fiber bending sensor is simple and inexpensive.

Published in:

Photonics Technology Letters, IEEE  (Volume:21 ,  Issue: 2 )