Authors:- Andiboyina Vijayasri, B. Murali Krishna
Abstract:- Carry look ahead adder (CLA) is the fastest of all adders and achieve speed through parallel carry computations. This method does not require the carry signal to propagate stage by stage. In this project, an efficient reversible implementation of Carry-Look ahead Adder (CLA) in all-optical domain is presented. Now-adays, semiconductor optical amplifier (SOA)- based Mach–Zehnder interferometer (MZI) plays a vital role in the field of ultra-fast all-opsoa-based-carry-lookahead-adder-using-reversible-mzitical signal processing. We have used all optical based Mach-Zehnder Interferometer (MZI) switches to design the CLA circuit implementing reversible functionality. The design of reversible circuit with optical technology can be implemented using Semiconductor Optical Amplifier (SOA) based Mach-Zehnder Interferometer (MZI) switch, which has significant advantages of high speed, low power, fast switching time and ease of fabrication. A conventional carry select adder is still power consuming due to the dual ripple carry adder structures having cin as ‘0’ and ‘1’. An efficient method which replaces the ZCLA instead of RCA with cin=’0’in the conventional CSLA is efficient and this CLA with the Mach zehnder interferometer technique can be more helpful and advantageous for the digital optical fibre communications.