Abstract
A method for modeling the mode-coupling process in strongly modulated long
period gratings (LPGs) is reported. The method is based on calculating the
variations of local-mode profiles and propagation constants over the
perturbed regions and solving the coupled local-mode equations to obtain a
quantitative description of the intermodal energy exchange. The
mode-coupling process and the spectral characteristics of a CO$_{2}$ laser-inscribed LPG in a photonic crystal fiber are numerically
modeled and found in good agreement with the experimentally measured
results. Compared with the methods based on the conventional coupled-mode
and the mode-projection theories, the current method provides a more
accurate description of the mode coupling process for LPGs with strong but
slow-varying perturbations.
© 2010 IEEE
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