All Optical Design of Hybrid Adder Circuit Using Terahertz Optical Asymmetric Demultiplexer

In this work we present the optical domain implementation of an n-bit hybrid adder circuit using terahertz optical asymmetric demultiplexer (TOAD). The work is completed in two phases. In initial phase, we show the naive design of TOAD based circuit for ripple carry and carry look ahead adder and then in the final phase the design has been improved by taking optical cost and delay into account. The presented theoretical model promises both higher processing speed and accuracy. From the experimental verification we have seen that the proposed model not only has enhanced the cost of the design but also has reduced overall delay of the design. For fair analysis, we have compared the incurred design cost metrics with related work results, where a considerable improvement in our proposed design model is registered.