A Y-shaped photonic integrated device with XNOR/NAND/NOR for optical signal processing

Logic gates are the key components in optical communication technology for performing a wide range of operations. This study presents a design of all-optical XNOR/NAND/NOR integrated device based on the optical interference-effect. A device using Y-shaped waveguides of 2-D photonic crystal made of silicon rods with an air background is built. In this research, the XNOR, NAND, and NOR logic gates were all implemented in a single structure by making appropriate adjustments to phase of input optical signals. Using plane-wave extension (PWE) and finite-difference-time-domain (FDTD) methods, the architecture is simulated for XNOR/NAND/NOR logic gates numerically and verified their accuracy. The proposed structure for XNOR/NAND/NOR logic gates takes up a smaller area of 9 m × 9 m , and it gives a contrast ratio of 9.91 dB , 11.7 dB , and 8.75 dB for XNOR, NAND, and NOR logic gates respectively at a wavelength of 1.55 m . Additionally, NAND logic has less insertion loss of 0.01 dB and transmission ratio of more than 95 % . As a result, the suggested logic gates may have a place in optical signal processors and other photonic integrated devices.