Abstract
We present a new model predicting the photosensitivity response of
hydrogen/deuterium-loaded optical fibers used for the fabrication of fiber
Bragg gratings (FBGs). This model considers space- and time-dependent
hydrogen concentration as a key phenomenon to explain the growth rates of
strong index changes ($ > 10 ^{-3}$). The model outputs are compared to several photosensitivity
experiments made with three different fibers and different hydrogen-loading
concentrations. The experimental results presented in this paper clearly
show that the time interval between each step of the grating inscription has
an impact on the overall photosensitivity response. Moreover, the proposed
model confirms that the variations observed in the measured photosensitivity
come from changes in hydrogen concentration resulting from its consumption
by the photosensitivity reaction and its diffusion into the glass. This
model will find application in the precise fabrication of strong FBGs by
helping to predict the optimum writing conditions.
© 2009 IEEE
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