Abstract
We demonstrate that UV-induced gratings in hydrogen-loaded fibers show a complex decay behavior at temperature above 600 ºC. The complete erasure of the initial grating is followed by a growth of the secondary grating, which survive even at very high temperatures, over 1400 ºC. This transition was observed for all studied germanium-doped fibers, including SMF-28. We attribute the effect to the formation of a grating of oxygen-deficient centers due to the migration of water from exposed to unexposed regions of the fiber core
© 2003 Optical Society of America
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