Abstract

Using 334-nm light, we demonstrate side writing of Bragg gratings with an index change of $\sim {10}^{-4}$ 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

Refractive-index gratings written by near-ultraviolet radiation

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