Design and Simulation of Linear All-Optical Comparator Based on Square-Lattice Photonic Crystals

An optical comparator is an important logic circuit used in digital designs. Photonic crystals are among the platforms for implementing different kinds of gates and circuits, they structures with alternating refractive indices. In this paper, designed simulated based on a square lattice photonic crystal. design comparator, small-sized structure used. The simulation results show that proposed there high difference between logical values “0” “1”, which defined power level. Due to small size adequate suits integrated circuits accuracy. footprint 149.04 µm2, calculated rise time less than 0.4 ps.