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All-optical XOR gate using SOA based Mach-Zehnder Interferometer

In this paper an all-optical exclusive OR (XOR) gate is proposed, which uses an integrated semiconductor optical-amplifier based Mach-Zehender interferometer. The design works on differential phase modulation scheme and the operation of the proposed gate is verified up to 120 Gb/s. Results of the gate has been analyzed in time domain for different input bit sequences. Highest extinction ratio of 26.01 dB is noted at 80 Gb/s. Rate analysis is also performed to optimize the Quality factor and a bit error rate.