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Proceedings Paper

Rugate mirrors on optical fiber for sensor applications
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, a phase modulator and 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 micrometers . The reflectance/transmittance ratio during growth were adjustable from 0.05/0.95 to 0.95/0.05 and mirrors used in the experimental interferometer had no inal reflectances of 40%, 68%, and 40% respectively. Design and fabrication procedures permit implementation of window functions and matching layers for flexible control over transmittance and reflectance charateristics. The long-cavity Fabry-Perot sensor was demonstrated for use as a strain gauge. Good agreement was shown with results obtained by a conventional strain gauge.

Paper Details

Date Published: 25 September 1995
PDF: 9 pages
Proc. SPIE 2510, Fiber Optic and Laser Sensors XIII, (25 September 1995); doi: 10.1117/12.221714
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. (South Africa)
Pavel V. Bulkin, Rand Afrikaans Univ. (South Africa)


Published in SPIE Proceedings Vol. 2510:
Fiber Optic and Laser Sensors XIII
Ramon P. DePaula; John W. Berthold, Editor(s)

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