Abstract
We studied experimentally the bending sensitivity of long-period fiber gratings (LPFGs) written in the single-mode fiber under external tension by CO2 laser. It is found that the LPFG was not only more sensitive to the fiber bending, but also sensitive to the bending direction, which can be attributed to the asymmetric index modification induced across the fiber section by the CO2 laser. Thanks to their unique bending characteristics, this kind of LPFGs could find applications in directional fiber bending sensors.
© 2010 Optical Society of America
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