Application of optical logic gates

Abstract

This paper proposes optical NOT. AND, and NOR gates using unijunction transistor (UJT), light emitting diode (LED), and light dependent resistor (LDR). Efforts are made to extend the development of these gates using LDR, LED, and UJT to work at 1.8V instead of 3V. These optical gates find their application in the field of fiber optics, optical logic isolators, and other instrumentation systems.