Design of basic logic gates using optical threshold logic

Abstract

Threshold Logic Gate (TLG) is a potential alternative of Boolean Logic circuit. It is one of the fundamental components of neural network. An Optical Threshold Logic Gate (OTLG) has been designed in this paper, using a reflector telescopic system and a resonant Fabry-Perot cavity. Threshold logic gate consists of a weighted summing unit followed by a comparator. In the proposed OTLG, the weight of the input signal is varied using a polarizer-analyser combination. The threshold value, which is the reference of the comparator, is applied into the Fabry–Perot cavity with the help of a Beam splitter . AND, OR and NOT gates are implemented by setting the threshold values of the proposed OTLG.The system has been modelled analytically and studied using MATLAB and FINESSE. The simulation results for OTLG based Basic Gates are presented here.