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Proceedings Paper

Two-mode fiber-optic sensors using a white-light spectral interferometric technique
Author(s): Petr Hlubina; Dalibor Ciprian; Lenka Knyblova
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Paper Abstract

We analyze theoretically fiber-optic sensor configurations working in the time domain or in the spectral domain and utilizing interference between two spatial or polarization modes. We show for example that a two-mode fiber interferometer in which the phase difference between the two modes is large and the intermodal group optical path difference (OPD) is zero at a specific wavelength of a light source of a short coherence length can be used without losing both time-domain and spectral-domain interference. Similarly, we analyze theoretically a tandem configuration of two interferometers with one of the interferometers as a receiving interferometer and the other one as a sensing two-mode fiber interferometer. We show that time-domain or spectral-domain interference lost due to the OPD between the two modes exceeding the coherence length can be restored in the configuration. We analyze both theoretically and experimentally a tandem configuration of the receiving interferometer and the sensing two-mode fiber interferometer in which spectral interference between two polarization modes is detected by a low-resolution spectrometer. The configuration is characterized by suitable adjusting of the measuring sensitivity over a broad wavelength range. We present some preliminary experimental results regarding sensing of strain using an elliptical-core optical fiber.

Paper Details

Date Published: 24 September 2005
PDF: 11 pages
Proc. SPIE 5952, Optical Fibers: Applications, 59520Y (24 September 2005); doi: 10.1117/12.621096
Show Author Affiliations
Petr Hlubina, Technical Univ. of Ostrava (Czech Republic)
Dalibor Ciprian, Technical Univ. of Ostrava (Czech Republic)
Lenka Knyblova, Technical Univ. of Ostrava (Czech Republic)

Published in SPIE Proceedings Vol. 5952:
Optical Fibers: Applications
Leszek R. Jaroszewicz; Brian Culshaw; Anna Grazia Mignani, Editor(s)

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