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Proceedings Paper

Spectral detection schemes for the low-coherence-based two-mode fiber waveguide sensors
Author(s): Petr Hlubina
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Paper Abstract

Two detection schemes utilizing a two-mode fiber waveguide as an intrinsic sensor are presented in the case when a low-coherence source is used and no observable interference pattern exists at the exit face of the fiber waveguide. In the first detection scheme the sensor configuration is used which consists of a two-mode fiber waveguide and a high-resolution spectrometer placed at its output. In the second detection scheme the output optical field of the two-mode fiber waveguide is analyzed in the Michelson interferometer configuration by a low- resolution spectrometer. It has theoretically been shown that in both detection schemes the spectral modulation is present which is closely connected with both the measured and intermodal dispersion. However, the sensor operation of the second detection scheme is constrained by the optical path difference (OPD) in the Michelson interfermeter which is not only greater than the source coherence length, but is also adjusted to match the group OPD between guided modes.

Paper Details

Date Published: 25 September 1995
PDF: 10 pages
Proc. SPIE 2510, Fiber Optic and Laser Sensors XIII, (25 September 1995); doi: 10.1117/12.221702
Show Author Affiliations
Petr Hlubina, Silesian Univ./Opava (Czech Republic)

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

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