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The feasibility of realizing an all-optical XNOR gate for 160Gb/s return-to-zero data pulses by using for the first time a single quantum-dot semiconductor optical amplifier (QD-SOA)-based Mach–Zehnder interferometer (MZI) is theoretically investigated and demonstrated. The proposed scheme differs from the usually employed ones in the way the MZI configuration is exploited. This consists in combining...
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