All-Optical XOR Gate Based on a Saturable Cavity

We investigate the theoretical properties of a novel all-optical XOR gate design consisting of a saturable absorber in an all pass ring resonator. The two resonant inputs are combined in a 3 dB splitter which is then connected to the ring, where the pass port provides the XOR output. Using analytical methods we optimize the coupling constant of the ring and determine the power range over which the XOR operation is retained.