Abstract
A novel ultra-long-period fiber grating with periods of up to several millimeters induced by high-frequency CO2 laser pulses is reported, for the first time to our knowledge. The refractive index change occurs mainly within the cladding area of the fiber and has an unsymmetrical distribution on the cross-section of the ULPFG. The characteristics of temperature, strain, torsion and refractive index are investigated by experiment, which can offer greater potential for applications in measurement of multi-parameters when compared with conventional LPFGs. In addition, potential applications of such an ULPFG are addressed.
© 2006 IEICE
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