Abstract

We demonstrate a high-sensitivity broadband (12501650nm) fiber micro-Michelson interferometer using a single-mode fiber end-spliced with a sphered-end hollow-core fiber. The hollow core is slightly smaller than the solid core of a single-mode fiber, so the fractional power of the core mode is converted into cladding modes. The excited cladding modes propagate at distinct optical paths along the hollow-core fiber and have individual foci outside the spherical lens. The reflected core mode, generated at the solid core–air interface, and the reflected cladding modes, generated at external material, interfere with each other to produce beating in the interference signals.

© 2011 Optical Society of America

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