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Simple Fresnel Reflection-Based Optical Fiber Sensor for Multipoint Refractive Index Measurement Using an AWG

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5 Author(s)
Chun-Liu Zhao ; Inst. of Optoelectron. Technol., China Jiliang Univ., Hangzhou, China ; Jihui Li ; Shuqin Zhang ; Zaixuan Zhang
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A simple Fresnel reflection-based optical fiber refractometer for simultaneous multipoint measurement based on an arrayed-waveguide grating (AWG) is proposed. The AWG is used as a demultiplexing unit and different channel fibers of the AWG work as different sensor heads. Every channel light divided by the AWG is marked with a different central wavelength, and its reflection from its fiber-solution interface is used to measure the RI of the inserted solution. By using the AWG unit, a simple and compact structure sensor for multipoint sensing is achieved. Experiment results show that the sensor works well and the average sensitivity is ~ 01.9 dB/RIU for refractive indices, in the range of 1.33-1.42.

Published in:

Photonics Technology Letters, IEEE  (Volume:25 ,  Issue: 6 )

Date of Publication:

March15, 2013

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