Abstract

A simple, compact, and highly sensitive optical fiber directional bend sensor is presented. This device consists of a lateral-offset splicing joint and an up-taper formed through excessive fusion splicing method. The lateral-offset splicing breaks the cylindrical symmetry of the fiber and defines a pair of directions along which the bending response of the Mach–Zehnder interferometer transmission spectrum is different and thus could be used for bending vector measurement. For a curvature range from 3 to 3m1, the bending sensitivities at 1463.86 nm and 1548.41 nm reach 11.987nm/m1 and 8.697nm/m1, respectively.

© 2012 Optical Society of America

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