Abstract

An optically induced grating in an asymmetric nonlinear directional coupler, formed by the interference of two strong external fields in a nonlinear medium, is analyzed. The grating constant and the amplitude of the grating depend on the parameters of the external waves, and thus they can be varied during coupler operation. As a result external-power-controlled coupling of a chosen pair of normally mismatched guided modes can be realized.

© 1994 Optical Society of America

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