Abstract
The authors report a waveguide design which has been optimised to allow efficient, all-optical switching, in AlGaAs at half the bandgap. The effective area has been reduced to 6 mu m/sup 2/, allowing us to observe a nonlinear phase shift of >5 pi . Nonlinear directional couplers, fabricated in the same material, exhibit a critical power of 42 W of energy of 31 pJ. >
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