Fiber optic refractive index sensor based on π-phase shifted fiber Bragg grating fabricated on etched side-hole fiber

Qi Zhang; Lingling Hu; Jiajun Tian; Natale J. Ianno; Ming Han

doi:10.1117/12.2018265

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29 May 2013 Fiber optic refractive index sensor based on π-phase shifted fiber Bragg grating fabricated on etched side-hole fiber

Qi Zhang, Lingling Hu, Jiajun Tian, Natale J. Ianno, Ming Han

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Proceedings Volume 8722, Fiber Optic Sensors and Applications X; 87220R (2013) https://doi.org/10.1117/12.2018265
Event: SPIE Defense, Security, and Sensing, 2013, Baltimore, Maryland, United States

Abstract

In this paper, we present a temperature-insensitive refractive index sensor based on π-phase-shifted Bragg gratings fabricated on side-hole fibers processed by wet chemical etching technique. The reflection spectrum of the π-phase shifted gratings on etched side-hole fiber features two notches with large spectral separation, which was used for refractive index (RI) detection in our application. The relative spectral notch separation exhibited a RI sensitivity of −278.5 pm/RIU (RIU: RI unit). Theoretical simulation obtained the temperature sensitivity of −0.00241 pm/°C, and experimental results also showed little sensitivity to temperature of our RI sensor.

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Qi Zhang, Lingling Hu, Jiajun Tian, Natale J. Ianno, and Ming Han "Fiber optic refractive index sensor based on π-phase shifted fiber Bragg grating fabricated on etched side-hole fiber", Proc. SPIE 8722, Fiber Optic Sensors and Applications X, 87220R (29 May 2013); https://doi.org/10.1117/12.2018265

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