MMI-Based Simultaneous All-Optical XOR–NAND–OR and XNOR–NOT Multilogic Gate for Phase-Based Signals

Abstract

We propose a novel design to simultaneously access various optical logic functions from different output ports. Logical values of inputs and outputs are defined in phase and intensity area of light, respectively. The proposed structure is composed of one multimode interference waveguide with the ultrasmall size of 2.5 μm × 21 μm. Three output ports of proposed structure offer XOR, NAND, and OR logic functions. In addition, XNOR and NOT logic gates are realized by considering some changes in the conditions. Beam propagation method has been utilized to accomplish the simulations of light propagation. Simulation results of structure in whole C-band show that the maximum insertion loss is -0.14 dB and the least contrast ratio achieved for XOR, NAND, OR, XNOR, and NOT logic functions are 26, 24.7, 25.9, 26, and 25 dB, respectively.