Abstract
High-temperature annealing behaviors of long-period fiber grating (LPFG)
induced by high-frequency CO$_{2}$ laser pulse in an endlessly single-mode photonic crystal fiber
(ESM-PCF) are investigated in this paper. We find that the change difference
of effective refractive index between the air holes cladding and the solid
core of the ESM-PCF both in grating fabricating and in annealing processes
with different mechanisms would cause resonant wavelength red shift. Through
annealing the gratings under high temperature at 600 $^{\circ}$C–650 $^{\circ}$C, its stability, linearity, and repeatability to temperature and
tensile strain responses under high temperature condition can be greatly
enhanced. Our study shows that the changes in fiber glass structure would
have significant influence on the optical properties of ESM-PCF LPFG and
thus will help understanding of the forming mechanisms and physical
characteristics of ESM-PCF LPFG. In addition, ESM-PCF LPFGs can be used as
temperature or strain sensors after annealing at high temperature of 600 $^{\circ}$C–650 $^{\circ}$C.
© 2010 IEEE
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