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Optical Refractive-Index Sensor Based on Dual Fiber-Bragg Gratings Interposed With a Multimode-Fiber Taper

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5 Author(s)
Li-Yang Shao ; Dept. of Opt. Eng., Zhejiang Univ., Hangzhou ; Zhang, A.P. ; Wei-Sheng Liu ; Hong-Yan Fu
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A new type of optical refractive-index (RI) sensor is proposed and experimentally demonstrated by using a structure of two single-mode fiber (SMF) Bragg gratings with a multimode fiber (MMF) taper in-between. The loss induced by a mismatch of waveguide structure between SMFs and MMFs is amplified by a tapering process, and is utilized for RI sensing through evanescent field. Experimental results show that the sensor possesses a tailorable sensitivity to the change of external RI and has a good linear response in the simultaneous measurement of external RI and temperature

Published in:

Photonics Technology Letters, IEEE  (Volume:19 ,  Issue: 1 )

Date of Publication:

Jan.1, 2007

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