Two-mode fiber-optic sensors using a white-light spectral interferometric technique

Petr Hlubina; Dalibor Ciprian; Lenka Knyblova

doi:10.1117/12.621096

24 September 2005 Two-mode fiber-optic sensors using a white-light spectral interferometric technique

Petr Hlubina, Dalibor Ciprian, Lenka Knyblova

Proceedings Volume 5952, Optical Fibers: Applications; 59520Y (2005) https://doi.org/10.1117/12.621096
Event: Congress on Optics and Optoelectronics, 2005, Warsaw, Poland

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.

Citation Download Citation

Petr Hlubina, Dalibor Ciprian, and Lenka Knyblova "Two-mode fiber-optic sensors using a white-light spectral interferometric technique", Proc. SPIE 5952, Optical Fibers: Applications, 59520Y (24 September 2005); https://doi.org/10.1117/12.621096

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