Design and performance analysis of 2D photonic crystal-based all-optical parity generator and checker

In this paper, a compact design of 2D photonic crystal-based all-optical even parity generator and checker is constructed on a square lattice of silicon rods with waveguides made of point and line defects. Paper also presents a detailed review on photonic crystal (PhC)-based all-optical logic devices. The proposed circuits are constructed by cascading all-optical XOR gates, where the logical inputs interfere based on the provided phase shift with the help of interference effect. The bandgap calculations and the behavior of the periodic variation in the refractive index of the PhC are studied by using the finite difference time-domain and the plane wave expansion methods. The contrast ratio for the proposed parity generator is 20.18 dB with a response time of 0.17 ps and a data rate of 5.88 Tb/s. Similarly, the parity checker circuit has a contrast ratio of 89.48 dB and provides stabilized output in 0.46 ps, and thus, the data rate of the structure is 2.17 Tb/s.