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Optical refractometer based on an asymmetrical twin-core fiber Michelson interferometer

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Abstract

We report and demonstrate an optical refractometer based on a compact fiber Michelson interferometer. The Michelson interferometer is composed of an asymmetrical twin-core fiber containing a central core and a side core. By chemically etching a segment of the twin-core fiber until the side core is exposed, the effective index of the side core in the etched region is sensitive to the environmental refractive index, which leads to a shift of the transmission spectrum of the Michelson interferometer. The experimental results show that such a device has a refractive index resolution of more than 800nm/refractive index unit in the range of 1.34–1.37.

© 2011 Optical Society of America

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