document: All-optical XOR gate using semiconductor optical amplifiers without additional input beam The novel design of an all-optical XOR gate by using cross-gain modulation of semiconductor optical amplifiers has been suggested and demonstrated successfully at 10 Gb/s . Boolean AB and AB of the two input signals A and B have been obtained and combined to achieve the all-optical XOR gate . No additional input beam such as a clock signal or continuous wave light is used in this new design , which is required in other all-optical XOR gates
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