Abstract
We investigate in detail the process of CO$_{2}$-laser writing of long-period fiber
gratings (LPFGs) in unannealed and annealed boron-doped fiber samples by using
repeated scanning of CO$_{2}$-laser pulses. We find that the writing dynamics depends
strongly on the CO$_{2}$-laser energy density and the annealing temperature of
the fiber. Our results from analyzing the writing dynamics reveal the relative
importance of various physical effects arising from glass structure changes
due to different writing conditions and thus provide a better understanding
of the formation and the properties of CO$_{2}$-laser written LPFGs.
© 2009 IEEE
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