Abstract

The threshold for the fabrication of fiber Bragg gratings with ultrafast 800-nm radiation and a phase mask was studied in SMF-28 and all-silica core fiber by use of 125-fs pulses. High-pressure molecular hydrogen loading (${\mathrm{H}}_2$ loading) was observed to significantly lower the grating writing threshold in standard Ge-doped telecommunication fiber. No reduction was observed with all-silica core fiber. The index change appeared to be confined to the Ge-doped core region of the fiber. Gratings in ${\mathrm{H}}_2$-loaded SMF-28 had thermal annealing behavior similar to UV-induced gratings. Unlike UV-induced ${\mathrm{H}}_2$-loaded gratings, no absorption associated with Ge–OH defect formation was observed.

© 2004 Optical Society of America

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