ALL-OPTICAL WAVELENGTH ENCODED NAND AND NOR OPERATIONS EXPLOITING SEMICONDUCTOR OPTICAL AMPLIFIER BASED MACH-ZEHNDER INTERFEROMETER WAVELENGTH CONVERTER AND PHASE CONJUGATION SYSTEM

Non-linear materials have already been established as optical switch, which is the gateway for implementation of all-optical logic gates. Semiconductor optical amplifier (SOA), optical phase conjugation system (PCS) and Mach-Zehnder Interferometer (MZI) have also been used several times for implementing all-optical gates. Here in this paper, the authors propose a new scheme for implementing optical NAND and NOR logic gates (which are universal gate also) by the application of the wavelength encoding principle, which has a lot of advantages over the conventional intensity and polarization based encoding principle.