Influence of fiber bending on wavelength demodulation of fiber-optic Fabry-Perot interferometric sensors

Guigen Liu, Qiwen Sheng, Weilin Hou, Ming Han

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

In practical applications of fiber optic sensors based on Fabry-Perot interferometers (FPIs), the lead-in optical fiber often experiences dynamic or static bending due to environmental perturbations or limited installation space. Bending introduces wavelength-dependent losses to the sensors, which can cause erroneous readings for sensors based on wavelength demodulation interrogation. Here, we investigate the bending-induced wavelength shift (BIWS) to sensors based on FPIs. Partially explicit expressions of BIWSs for the reflection fringe peaks and valleys have been derived for sensors based on low-finesse FPI. The theoretical model predicts these findings: 1) provided that a fringe peak experiences the same modulation slope by bending losses with a fringe valley, BIWSs for the peak and valley have opposite signs and the BIWS for the valley has a smaller absolute value; 2) BIWS is a linear function of the length of the bending section; 3) a FPI with higher visibility and longer optical path length is more resistant to the influence of bending. Experiments have been carried out and the results agree well with the theoretical predictions.

Original languageEnglish (US)
Pages (from-to)26732-26744
Number of pages13
JournalOptics Express
Volume24
Issue number23
DOIs
StatePublished - Nov 14 2016

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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