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Optical Engineering

Passive interrogation of an extrinsic Fabry-Pérot interferometer using a three-wavelength method
Author(s): Yi Jiang; Caijie Tang
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Paper Abstract

A three-wavelength method is developed to interrogate an extrinsic Fabry-Pérot interferometer (EFPI) for the measurement of a dynamic measurand. Three signals 120 deg out of phase are created by using three fiber Bragg gratings (FBGs). A phase demodulator, which is the same as that used for demodulating a 3×3 coupler-based interferometer, is used to measure the phase change. A minimum detectable phase of 0.43 μrad/Hz1/2 is achieved.

Paper Details

Date Published: 1 June 2009
PDF: 5 pages
Opt. Eng. 48(6) 064401 doi: 10.1117/1.3156018
Published in: Optical Engineering Volume 48, Issue 6
Show Author Affiliations
Yi Jiang, Beijing Institute of Technology (China)
Caijie Tang, Beijing Institute of Technology (China)

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