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Ultrahigh-speed all-optical demultiplexing corresponding to a 680-Gbit/s signal pulse is demonstrated based on an ultrafast surface-reflection all-optical switch (called LOTOS) made with low-temperature-grown strained Be-doped InGaAs/InAlAs multiple quantum wells. LOTOS is basically a saturable absorber that relies on a carrier-induced change in excitonic absorption in InGaAs/InAlAs MQWs. The ultrafast...