Abstract
The collinear interaction of optical waveguide modes is considered in a thin semiconductor layer containing an optical inhomogeneity (space-charge wave) growing along the wave-propagation direction. Coupled-mode equations are solved for the case where interacting waves propagate in the same direction or in opposite directions. The mode conversion efficiency is shown to depend substantially on the space-charge wave amplification with allowance for the detuning from the phase matching condition. The incident and the oppositely propagating modes can be “degenerate,” in which case the modes have the same power over the entire disturbed region.
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