Analysis of single-mode fiber-optic extrinsic Fabry-Perot interferometric sensors with planar metal mirrors

Qiwen Sheng, Guigen Liu, Nezam Uddin, Ming Han

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

We theoretically study the spectral characteristics and noise performance of wavelength-interrogated fiber-optic sensors based on an extrinsic Fabry-Perot (FP) interferometer (EFPI) formed by thin metal mirrors. We develop a model and use it to analyze the effect of key sensor parameters on the visibility and spectral width of the sensors, including the beam width of the incident light, metal coating film thickness, FP cavity length, and wedge angle of the two mirrors. Through Monte Carlo simulations, we obtain an empirical equation that can be used to estimate the wavelength resolution from the visibility and spectral width, which can be used as a figure-of-merit that is inherent to the sensor and independent on the system noises. The work provides a useful tool for designing, constructing, and interrogating high-resolution fiber-optic EFPI sensors.

Original languageEnglish (US)
Pages (from-to)7894-7902
Number of pages9
JournalApplied optics
Volume60
Issue number26
DOIs
StatePublished - Sep 10 2021
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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