Abstract

We report a large increase in photosensitivity of germanium-doped silicate fibers by rapid heat treatment of hydrogen-loaded fibers at 1000 °C before exposure of the fibers to 242-nm radiation. The increase in photosensitivity is compared with thermally induced absorption caused by introduction of massive amounts of hydroxyl species. The absorption loss was measured to be 0.02 dB/cm mol. % OH at 1.55 µm. Strong gratings Δn>1×10-4 in germanium-free phosphorous-doped fibers in the presence of 242-nm radiation have also been manufactured by this technique.

© 2000 Optical Society of America

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