Abstract

A highly sensitive optical fiber Sagnac interferometer hydrogen sensor is proposed and demonstrated. The device is fabricated by inserting a segment of panda fiber coated with Pt-loaded ${\mathrm{WO}}_3/{\mathrm{SiO}}_2$ into a Sagnac interferometer loop. When $\mathrm{Pt}/{\mathrm{WO}}_3$ film is exposed to hydrogen, the exothermic reaction raises the temperature of the panda fiber, resulting in the resonant wavelength shift of the interferometer, and the resonant dip obtained has a large extinction ratio of $\sim 25\mathrm{dB}$ and a narrow linewidth of 2.5 nm. Such a device responds fast to hydrogen, exhibits a high sensitivity of $-7.877\mathrm{nm}/\%$ (vol. %) within the range of 0%–1.0% and is robust, low cost, and easy to fabricate.

© 2016 Optical Society of America

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