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Growth dynamics of chemical composition gratings in fluorine-doped silica optical fibers

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Abstract

The refractive-index modulation of chemical composition gratings in fluorine–germanium-doped silica fibers as a function of thermal treatment during manufacturing has been studied. The final grating strength was found to depend strongly on an intermediate annealing step, with an optimum temperature near 600–700 °C, before development at a fixed temperature of 1000 °C. Low–temperature treatment, aimed at removing any remaining hydrogen from the fiber, performed at 100 °C for 20 h before the annealing step, also significantly increased the final refractive-index modulation.

© 2002 Optical Society of America

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