Spectral detection schemes for the low-coherence-based two-mode fiber waveguide sensors

Petr Hlubina

doi:10.1117/12.221702

25 September 1995 Spectral detection schemes for the low-coherence-based two-mode fiber waveguide sensors

Petr Hlubina

Proceedings Volume 2510, Fiber Optic and Laser Sensors XIII; (1995) https://doi.org/10.1117/12.221702
Event: European Symposium on Optics for Environmental and Public Safety, 1995, Munich, Germany

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.

Citation Download Citation

Petr Hlubina "Spectral detection schemes for the low-coherence-based two-mode fiber waveguide sensors", Proc. SPIE 2510, Fiber Optic and Laser Sensors XIII, (25 September 1995); https://doi.org/10.1117/12.221702

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KEYWORDS

Waveguides

Spectroscopy

Michelson interferometers

Sensors

Fiber optics sensors

Modulation

Dispersion

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