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Bragg grating fabrication in germanosilicate fibers by use of near-UV light: a new pathway for refractive-index changes

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Abstract

Using 334-nm light, we demonstrate side writing of Bragg gratings with an index change of 10-4 in germanium-doped fibers. No hydrogen loading of the fibers was required. These gratings have the same temperature stability as gratings fabricated with 240-nm light. Our results suggest that photoionization is not needed for formation of gratings in Ge-doped glass. We observe an enhancement of the 334-nm photosensitivity in boron-codoped fibers and suggest that B facilitates a structural transformation of the glass.

© 1997 Optical Society of America

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