Multimode interference and a white light scanning Michelson interferometer with a 400-mm sapphire fiber sensing head

Tianchu Li; Russell G. May; Anbo Wang; Richard O. Claus

doi:10.1117/12.318159

13 August 1998 Multimode interference and a white light scanning Michelson interferometer with a 400-mm sapphire fiber sensing head

Tianchu Li, Russell G. May, Anbo Wang, Richard O. Claus

Author Affiliations +

Proceedings Volume 3555, Optical and Fiber Optic Sensor Systems; (1998) https://doi.org/10.1117/12.318159
Event: Photonics China '98, 1998, Beijing, China

Abstract

In this paper we present the analysis of multimode (MM) interference induced by MM fiber interferometers and report the development of a white light scanning fiber Michelson interferometer with a sapphire fiber sensing head for the measurement of position-distance at high temperatures. The 'mode fading' effect in standard graded 50/125 micrometers fiber and independent 'inter-mode interference' in 100 micrometers step index profile fiber are discussed. By means of the 'mode selecting' technique, proposed and developed in this work, we demonstrated white light fringes with signal to noise ratios of more than 12 with a sensing head composed of a 400 mm long lead sapphire fiber and an uncoated sapphire target fiber.

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Tianchu Li, Russell G. May, Anbo Wang, and Richard O. Claus "Multimode interference and a white light scanning Michelson interferometer with a 400-mm sapphire fiber sensing head", Proc. SPIE 3555, Optical and Fiber Optic Sensor Systems, (13 August 1998); https://doi.org/10.1117/12.318159

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