Abstract
This paper focuses upon the kind of tapered waveguide structure that could be used, in integrated optics, for mode size control in two dimensions. The stationary states for various values of rib width, and rib height, are calculated for the case when a smaller rib sits upon a much wider one. A finite element package has been developed to effect the analysis and this is complemented with a three-dimensional beam propagation program. Modal control is demonstrated as the tapering proceeds. Finally, self-defocusing nonlinearity in introduced, with the ability of the power level to spread the field out from under the small rib into the lower (wider) ribbed guide being illustrated numerically.
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