Highly sensitive refractive index sensor based on two cascaded long period gratings with rotary refractive index modulation

Tao Zhu; YanEn Fan; Ming Deng; Yunjiang Rao

doi:10.1117/12.884844

19 May 2011 Highly sensitive refractive index sensor based on two cascaded long period gratings with rotary refractive index modulation

Tao Zhu, YanEn Fan, Ming Deng, Yunjiang Rao

Author Affiliations +

Proceedings Volume 7753, 21st International Conference on Optical Fiber Sensors; 77539M (2011) https://doi.org/10.1117/12.884844
Event: 21st International Conference on Optical Fibre Sensors (OFS21), 2011, Ottawa, Canada

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.

Citation Download Citation

Tao Zhu, YanEn Fan, Ming Deng, and Yunjiang Rao "Highly sensitive refractive index sensor based on two cascaded long period gratings with rotary refractive index modulation", Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 77539M (19 May 2011); https://doi.org/10.1117/12.884844

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