title: Tuning operating point of extrinsic Fabry-Perot interferometric fiber-optic sensors using microstructured fiber and gas pressure.
abstract: Intensity-based demodulation of extrinsic Fabry-Perot interferometric (EFPI) fiber-optic sensors requires the light wavelength to be on the quadrature point of the interferometric fringes for maximum sensitivity. In this Letter, we propose a novel and remote operating-point tuning method for EFPI fiber-optic sensors using microstructured fibers (MFs) and gas pressure. We demonstrated the method using a diaphragm-based EFPI sensor with a microstructured lead-in fiber. The holes in the MF were used as gas channels to remotely control the gas pressure inside the Fabry-Perot cavity. Because of the deformation of the diaphragm with gas pressure, the cavity length and consequently the operating point can be remotely tuned for maximum sensitivity. The proposed operating-point tuning method has the advantage of reduced complexity and cost compared to previously reported methods.
authors.affiliation: Department of Electrical Engineering, University of Nebraska–Lincoln, Lincoln, Nebraska 68588-0511, USA.
authors.forename: Jiajun
authors.initials: J
authors.lastname: Tian
authors.forename: Qi
authors.initials: Q
authors.lastname: Zhang
authors.forename: Thomas
authors.initials: T
authors.lastname: Fink
authors.forename: Hong
authors.initials: H
authors.lastname: Li
authors.forename: Wei
authors.initials: W
authors.lastname: Peng
authors.forename: Ming
authors.initials: M
authors.lastname: Han