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Opt Lett. 1990 Feb 1;15(3):198-200.

Two-mode fiber-optic resonant ring interferometer as a sensor.

Abstract

A fiber-optic resonant ring interferometer using a directional coupler was fabricated using a single-mode fiber. It is an unbalanced interferometer functioning on the optical path-length difference. We have measured the phase shift caused by temperature changes with this setup and can determine the direction of temperature variance when a light source of appropriate wavelength is used. Using a prism output coupler for an optical fiber in the resonant ring interferometer, we determine the intensity variation of the radiation pattern caused by the thermally induced phase shift.

PMID:
19759756
[PubMed]
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