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Applied Optics

Applied Optics


  • Vol. 39, Iss. 9 — Mar. 20, 2000
  • pp: 1382–1388

Phase-demodulation error of a fiber-optic Fabry–Perot sensor with complex reflection coefficients

James M. Kilpatrick, William N. MacPherson, James S. Barton, and Julian D. C. Jones  »View Author Affiliations

Applied Optics, Vol. 39, Issue 9, pp. 1382-1388 (2000)

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The influence of reflector losses attracts little discussion in standard treatments of the Fabry–Perot interferometer yet may be an important factor contributing to errors in phase-stepped demodulation of fiber optic Fabry–Perot (FFP) sensors. We describe a general transfer function for FFP sensors with complex reflection coefficients and estimate systematic phase errors that arise when the asymmetry of the reflected fringe system is neglected, as is common in the literature. The measured asymmetric response of higher-finesse metal–dielectric FFP constructions corroborates a model that predicts systematic phase errors of 0.06 rad in three-step demodulation of a low-finesse FFP sensor (R = 0.05) with internal reflector losses of 25%.

© 2000 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.2230) Instrumentation, measurement, and metrology : Fabry-Perot

Original Manuscript: October 25, 1999
Published: March 20, 2000

James M. Kilpatrick, William N. MacPherson, James S. Barton, and Julian D. C. Jones, "Phase-demodulation error of a fiber-optic Fabry–Perot sensor with complex reflection coefficients," Appl. Opt. 39, 1382-1388 (2000)

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