Abstract

A long-period fiber-grating sensor with a high strain sensitivity of 7.6pmμε and a low temperature sensitivity of 3.91pm°C is fabricated by use of focused CO2 laser beam to carve periodic grooves on a large- mode-area photonic crystal fiber. Such a strain sensor can effectively reduce the cross-sensitivity between strain and temperature, and the temperature-induced strain error obtained is only 0.5με°C without using temperature compensation.

© 2006 Optical Society of America

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