Simulation of reconfigurable double-input optical gates based on a microring flower-like structure, part II. Combinational logic gates.

A microring flower-like architecture is introduced to obtain optical logic gates that can be reconfigured. The proposed design can operate as a time-division multiplexer, a half adder/subtractor, and an optical single bit comparator circuit. The optical pump pulses modulate the microring resonators in this arrangement. Green lasers with a resonant wavelength of 532 nm are used to generate the optical pump pulses. To theoretically analyze the structure, the signal flow graph approach is applied. The proposed structure's performance is investigated by calculating certain figures of merit for the resulting output data streams. Outputs of the presented combinational logic gates are optimized by designing the most proper geometry of flower-like structure and simultaneously by opting for the best input port to drop port's optical path. It is demonstrated that proper distinguishing between 0 and 1 levels occurs in the output. The compact structure proposed is simple, expandable, and reconfigurable. The proposed structure can be used as a key component in high-speed optical networks, according to simulation results.