Design of optical switching devices using all-optical half adder based on terahertz optical asymmetric de-multiplexer

Abstract

This paper provides a detailed study to design and simulate all-optical half adder using terahertz optical asymmetric demultiplexer (TOAD). The effect of the semiconductor optical amplifier parameters on the operation of TOAD is studied. Through the use of the designed all-optical half adder unit, design of all-optical full adder, S-R flip flop, 1 bit random access memory (RAM) and 4 9 4 RAM are proposed. The contrast ratio, extinction ratio and amplitude modulation values are analyzed for all-optical half adder. The performance of all the proposed designs is investigated at 10 Gbps by using OptiSystem simulation software.Keywords Terahertz optical asymmetric demultiplexer (TOAD) Á Random access memory (RAM) Á Semiconductor optical amplifier (SOA) Á All-optical switching devices

Ultracompact all-optical full-adder and half-adder based on nonlinear plasmonic nanocavities

“…The practical on-chip integration applications require several key indexes for these nanoscale all-optical logic devices: ultrasmall feature size, ultralow threshold power, ultrahigh contrast ratio, as well as on-chip trigger [2,3]. More often than not, highly nonlinear fibers [4][5][6], optical asymmetric demultiplexers [7,8], and bulk periodically poled lithium niobate crystals [9][10][11] are used to demonstrate all-optical logic functions. The large size of the bulk materials and lumped components, having a feature size of several centimeters, limits the practical on-chip integration applications [12,13].…”