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25 September 1995 Spectral detection schemes for the low-coherence-based two-mode fiber waveguide sensors
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Proceedings Volume 2510, Fiber Optic and Laser Sensors XIII; (1995)
Event: European Symposium on Optics for Environmental and Public Safety, 1995, Munich, Germany
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.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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);

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