An Approach for the Realisation of NAND, NOR, & AND Gate Using Semiconductor Optical Amplifier & Band Pass Filter

All optical gate are the main building blocks of all logic circuit in various signal processing devices and circuits. As the need for bandwidth in communication system is increasing day by day SOA (semiconductor optical amplifier) can be a feasible solution for digital signal processing circuits. The semiconductor optical amplifier can be used for the purpose of wavelength conversion, for the synthesis of optical gates, and as comparators in various sequential and combinational digital circuits. In this paper we are a presenting an approach for the realization of universal logic gates NAND, NOR is presented and AND gate is also realized using the same circuits, the results obtained are analyzed on the basis of different values of power through optical power meter and through output time domain waveforms. In this paper nonlinear characteristic of SOA and FWM is utilized to implement various logic functions. The circuit has been implemented successfully at 10Gbps. The proposed scheme is potential approach for applications in future high bit rate optical networks.