Abstract

A fiber Mach–Zehnder interferometer (MZI) sensor, novel to our knowledge, based on a single “S”-like fiber taper has been fabricated via applying nonaxial pull in fiber tapering by a fusion splicer. The typical feature size of the structure has a length of 660μm and the axial offset of 96μm. This S fiber taper MZI has a refractive index (RI) sensitivity of 1590nm/refractive index unit in the RI range of 1.409–1.425 and a strain sensitivity of about 60pm/microstrain, which is 30 times higher than that of the normal two-taper-based MZI sensors.

© 2011 Optical Society of America

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