Review Article

Induced Bragg Gratings in Optical Fibers and Waveguides Using an Ultrafast Infrared Laser and a Phase Mask

Figure 5

Isochronal annealing curves of low- (circles, ) and high- (squares, ) reflectivity FBGs written in H2-loaded SMF-28 fiber with CW UV laser light (white shape) or femtosecond-IR laser light (black shape).
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