Abstract
An asymmetrical twin-core fiber based Michelson interferometer is reported
as a refractive index sensor. One core of the twin-core fiber locates at the
fiber center and the other core is 26 μm away from the central core. Part of the cladding of the twin-core
fiber over a small length is removed by chemical etching to make the effective
refractive index of the fundamental mode of the side core is sensitive to
the ambient refractive index. Therefore, the interference spectrum between
the central core and the side core shifts with the variation of the ambient
refractive index. The sensitivity of such a Michelson interferometer is ~270 nm/RIU
in the range of 1.34–1.38.
© 2011 IEEE
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