Methane Sensor Based on Fabry- Pérot Interferometer and Metal-Organic Framework Doped Polymer Coating

Yi, Xinruo; Cao, Rongtao; Ding, Hangjun; Wang, Mohan; Yang, Yang; Kim, Ki Joong; Ohodnicki, Paul R.; Chen, Kevin P.

doi:10.1364/ofs.2020.th4.32

Cited by 1 publication

(1 citation statement)

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“…2, the laser-induced scattering points produce ~50-dB enhancement of backscattered power above the Rayleigh backscattering level which is intrinsic to a standard single-mode optical fiber (Corning SMF-28e+). This increase in backscattered power from the laser-induced scattering points is sufficient to produce interference fringes for the subsequent real-time demodulation of cavity length changes and refractive index (RI) induced optical path differences (OPD) [17][18][19].…”

Section: A Fabrication Of Intrinsic Fabry-perot Interferometermentioning

confidence: 99%

CO₂Laser Tapering of Intrinsic Fabry–Perot Interferometers for Sensing

Zhao

et al. 2023

IEEE Sensors J.

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We present a highly reproducible method of fabricating a tapered intrinsic Fabry-Perot interferometer (IFPI) device with 5~6-m diameter at the taper waist. A femtosecond laser was applied to inscribe an IFPI with 3-cm cavity length in a single-mode fiber. A CO2 laser heated tapering process enabled by digitally controlled mirrors and a precision motorized fiber feed system was used to create a stable heating zone with the desired temperature profile for tapering the fiber IFPI cavity. The well-engineered tapering process produced tapered IFPI devices with insertion loss less than 0.3-dB at 1550-nm. A strong evanescent field exposed by the taper section was explored for refractive index sensing. Using swept optical frequency domination reflectometry, the tapered IFPI fiber sensor achieved a minimal refractive index sensing resolution 210 -5 . This paper demonstrates an integrated laser fabrication technique to produce tapered fiber optic devices for sensing applications.

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Section: A Fabrication Of Intrinsic Fabry-perot Interferometermentioning

confidence: 99%