title: Sagnac interferometer hydrogen sensor based on panda fiber with Pt-loaded WO3/SiO2coating.
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 WO3/SiO2into a Sagnac interferometer loop. When Pt/WO3film 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 ∼25  dB and a narrow linewidth of 2.5 nm. Such a device responds fast to hydrogen, exhibits a high sensitivity of -7.877  nm/% (vol. %) within the range of 0%-1.0% and is robust, low cost, and easy to fabricate.
authors.forename: Ben
authors.initials: B
authors.lastname: Xu
authors.forename: C L
authors.initials: CL
authors.lastname: Zhao
authors.forename: Fan
authors.initials: F
authors.lastname: Yang
authors.forename: Huaping
authors.initials: H
authors.lastname: Gong
authors.forename: D N
authors.initials: DN
authors.lastname: Wang
authors.forename: JiXiang
authors.initials: J
authors.lastname: Dai
authors.forename: Minghong
authors.initials: M
authors.lastname: Yang