Title :
Optical Refractive-Index Sensor Based on Dual Fiber-Bragg Gratings Interposed With a Multimode-Fiber Taper
Author :
Shao, Li-Yang ; Zhang, A. Ping ; Liu, Wei-Sheng ; Fu, Hong-Yan ; He, Sailing
Author_Institution :
Dept. of Opt. Eng., Zhejiang Univ., Hangzhou
Abstract :
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
Keywords :
Bragg gratings; fibre optic sensors; optical fibres; refractive index measurement; dual fiber-Bragg gratings; fiber-optic sensor; multimode-fiber taper; optical refractive-index sensor; Bragg gratings; Fiber gratings; Optical fiber sensors; Optical losses; Optical refraction; Optical sensors; Optical surface waves; Optical waveguides; Stimulated emission; Temperature sensors; Fiber Bragg grating (FBG); fiber-optic sensor; multimode fiber taper (MFT); refractive-index (RI) measurement;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2006.889010
