Design of a MMI-Based All-Optical AND-NAND-NOT and NOR-OR Multilogic Gate for Binary-Phase-Shift-Keyed Signal

All optical multilogic gate functions, AND, NAND, NOT, NOR, and OR, are numerically demonstrated with an identical 3×3 multimode interference coupler. A contrast ratio of greater than 9.5 dB is achieved for all functions.