Abstract

The thermal stability of Type I gratings is increased by postthermal tuning of the grating. Optimization of the procedure leads to gratings that can withstand temperatures as high as $600°\mathrm{C}$. Aging tests lead to lifetime predictions as high as $25\text{\hspace{0.17em}years}$ with $<3\mathrm{dB}$ reduction at $400°\mathrm{C}$. Single exponential relaxation is observed. Above $800°\mathrm{C}$ regeneration is obtained.

© 2010 Optical Society of America

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