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Experimental results with a simple all-optical nonlinear directional coupler are reported. The element was fabricated by Molecular Beam Epitaxy (MBE) and is composed of two Al.18Ga.82As waveguides of 1.85-μm thickness, coupled through a 0.948-μm-thick MQW. The MQW consists of 30 periods of alternating 10.6-nm GaAs and 21-nm Al.33Ga.67As layers. The waveguides are planar without any lateral confinement. The whole structure was grown on a GaAs substrate and is buffered on both sides by a 2.05-μm-thick layer of Al.72Ga.28As composition. The structure is illustrated in Figure 1.
© 1988 Optical Society of America
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