Tuning operating point of extrinsic Fabry-Perot interferometric fiber-optic sensors using microstructured fiber and gas pressure

Jiajun Tian, Qi Zhang, Thomas Fink, Hong Li, Wei Peng, Ming Han

Research output: Contribution to journalArticle

20 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)4672-4674
Number of pages3
JournalOptics Letters
Volume37
Issue number22
DOIs
StatePublished - Nov 15 2012

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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