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Refractive index measurement by fat long period grating sensor on a single mode optical fiber

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Abstract

A simple refractive index sensor based on a fat long period fiber grating (FLPFG) in a single-mode fiber is constructed and demonstrated. The sensor consists of periodical fattening region in a short piece of single-mode fiber. In this method, the fiber fattening is realized by applying a standard fusion splicing procedure on single mode optical fiber. The sensitivity of the sensor is 7.5 ×10-5 which the sensitivity is enhanced to the other kinds of long period fiber grating (LPFG).

© 2011 Optical Society of America

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