Design And Implementation Of Various Optical Logic Gates Using Semiconductor Optical Amplifier-Mach Zehnder Interferometer Scheme And Band Pass Filters

Abstract

All-optical computers eliminate the need for optical-electrical-optical (OEO) conversions, thus lessening the need for electrical power. Photonic logic is the use of light in terms of photons in logic gates (NOT, AND, OR, NAND, NOR, XOR, XNOR). Optical logic gates like OR, NOT, AND and EXOR were implemented using SOA-MZI structure at 10 Gbps using OptiSystem 7 software. Based on the necessity of combinational logics required in complex logic designs, NAND, NOR and EXNOR were also designed. The testability of the optical gate design is carried out by verifying its truth table.  The design uses the key components like data signal, probe signal, 3 dB couplers, XPM effect of Semiconductor Optical Amplifier (SOA) and optical band pass filters.  Based on the requirement for the truth table verification and considering the logic operation of the desired gate, the role of Gaussian optical filter is used before the optical power meter at the output end. This work can also be extended for designing various flip flops, shift registers and sequential circuits in photonics perspective.