Abstract

In thermally poled optical fibers, the second-order nonlinearity has been observed to be distributed in a narrow layer more than 10 μm beneath the anode surface, a result that cannot be explained by current models. In this Letter, we propose a new model based on slow migration of ${\mathrm{H}}_3{\mathrm{O}}^{+}$ and fast ${\mathrm{H}}^{+}$ migration related to the ${\mathrm{H}}_3{\mathrm{O}}^{+}$ concentration. The numerical simulation results show a narrow layer-shaped distribution of the induced second-order nonlinearity, which retains its magnitude and distribution profile in the migration process, and is in good agreement with the experimental observations.

© 2017 Optical Society of America

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