29 May 2013 Fiber optic refractive index sensor based on π-phase shifted fiber Bragg grating fabricated on etched side-hole fiber
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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, Qi Zhang, Lingling Hu, Lingling Hu, Jiajun Tian, Jiajun Tian, Natale J. Ianno, Natale J. Ianno, Ming Han, 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); doi: 10.1117/12.2018265; https://doi.org/10.1117/12.2018265
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