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Optical Engineering

Long dual-cavity fiber optic Fabry-Perot strain sensor with rugate mirrors
Author(s): Anatoli A. Chtcherbakov; Pieter L. Swart; Stephanus J. Spammer; Pavel V. Bulkin
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Paper Abstract

An all-fiber Fabry-Perot interferometer using coherence demultiplexing and rugate mirror reflectors grown with electron cyclotron resonance, plasma-enhanced chemical vapor deposition (ECR–PECVD) on the fiber ends is proposed. The interferometer consists of a laser diode source, two optical fiber cavities, three rugate mirrors, an optical phase modulator, and a quadrature phase detection system. Coherence demultiplexing allowed the use of fiber cavities of several meters in length with a partially coherent illuminating light source. Truly inhomogeneous refractive index mirrors were designed, taking into account dispersion and losses of SiOxNy at the required wavelength of 1.3 µm. The reflectance/transmittance ratios during growth were adjustable from 0.05/0.95 to 0.95/0.05 and mirrors used in the experimental interferometer had nominal reflectances of 40, 68, and 40%, respectively. Design and fabrication procedures permitted implementation of window functions and matching layers for flexible control over transmittance and reflectance characteristics. The long-cavity Fabry-Perot sensor was demonstrated for use as a strain gauge. Good agreement was shown with the results obtained by a conventional strain gauge.

Paper Details

Date Published: 1 April 1996
PDF: 5 pages
Opt. Eng. 35(4) doi: 10.1117/1.600712
Published in: Optical Engineering Volume 35, Issue 4
Show Author Affiliations
Anatoli A. Chtcherbakov, Rand Afrikaans Univ. (South Africa)
Pieter L. Swart, Rand Afrikaans Univ. (South Africa)
Stephanus J. Spammer, Rand Afrikaans Univ. (United States)
Pavel V. Bulkin, Rand Afrikaans Univ. (South Africa)

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