Intensity-modulated refractometer with long period fiber grating cascaded by chirped fiber grating

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Author
Yang, Jingyi
Dong, Xinyong
Chen, Li Han
Zheng, Yangzi
Chan, Chi Chu
So, Ping Lam
Date of Issue
2015
Conference Name
Proceedings of SPIE - 24th International Conference on Optical Fibre Sensors
School
School of Chemical and Biomedical Engineering
School of Electrical and Electronic Engineering
School of Materials Science and Engineering
Research Centre
Energy Research Institute @NTU
Version
Published version
Abstract
An intensity-modulated refractometer is proposed and experimentally demonstrated by using a long period fiber grating (LPG) cascaded with a chirped-fiber Bragg grating (CFBG). The reflection wavelength band of the CFBG was properly selected to contain the most sensitive spectral part of the LPG. As a result, intensity of the reflected signal was modulated linearly by refractive index (RI) of surrounding liquid outside the LPG. RI measurement in a range from 1.33 to ~1.45 was realized with enhanced sensitivity up to 48.93 μW/R.I.U.
Subject
Refractometers
Long Period Fiber Gratings
DRNTU::Engineering::Chemical engineering
Type
Conference Paper
Rights
© 2015 Society of Photo-optical Instrumentation Engineers (SPIE). This paper was published in Proceedings of SPIE - 24th International Conference on Optical Fibre Sensors and is made available as an electronic reprint (preprint) with permission of Society of Photo-optical Instrumentation Engineers (SPIE). The published version is available at: [http://dx.doi.org/10.1117/12.2194765]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
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http://dx.doi.org/10.1117/12.2194765
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