All-optical modulation and switching have been demonstrated in various nonlinear directional couplers (NLDCs).1-4 These experiments are performed by varying the intensity of a single input light beam to change the relative transmission of the two channels. This single-beam method has some undesirable features: the total absolute output of the NLDG in the bar state is much higher than in the cross state, and the large detuning from the band edge needed for high transmission results in a decrease in nonlinearity.

© 1989 Optical Society of America

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