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Proceedings Paper

Highly sensitive refractive index sensor based on two cascaded long period gratings with rotary refractive index modulation
Author(s): Tao Zhu; YanEn Fan; Ming Deng; Yunjiang Rao
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Paper Abstract

We present a refractive index (RI) sensor based on a fiber Mach-Zehnder interferometer, which is realized by two cascaded special long period gratings with rotary refractive index modulation (C-RLPFG). The wavelength shift of the refractometer behaves good linear response in a RI range of 1.3342 to 1.3362, and the sensitivity of 14.5pm/mm for 0.01SRI change has been obtained. The sensitivity is 4 times higher than that of M-Z interferometer formed by using normal long period fiber gratings. Such kind of high sensitivity, easy fabrication and simple structure interferometer may find applications in chemical or biochemical sensing field.

Paper Details

Date Published: 19 May 2011
PDF: 4 pages
Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 77539M (19 May 2011); doi: 10.1117/12.884844
Show Author Affiliations
Tao Zhu, Chongqing Univ. (China)
YanEn Fan, Chongqing Univ. (China)
Ming Deng, Chongqing Univ. (China)
Yunjiang Rao, Univ. of Electronic Science & Technology of China (China)
Chongqing Univ. (China)


Published in SPIE Proceedings Vol. 7753:
21st International Conference on Optical Fiber Sensors
Jacques Albert; Wojtek J. Bock, Editor(s)

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