All optical implementation of universal shift-register using terahertz optical asymmetric de-multiplexer based Optical Devices

Nowadays, the research on design of optical circuits and devices has received wide attention among the researchers due to ultra-high speed and low-power consumption properties in the optical devices and interconnects. In this conjuncture, optical design of combinational and sequential elements is given the great priorities in optical circuit research arena. Previously, we have investigated how to design optical memory elements with minimum optical components. Here, we propose optical implementation of universal shift register. The design is made using Terahertz Optical Asymmetric Demultiplexer(TOAD)based optical devices. Our proposed design is the generalized one as it includes all the behavior of four typical shift registers. To reduce the design complexity, we have used minimum numbers of TOADs, beam combiners and beam splitters and also our design confirms zero overhead in terms of number of ancilla inputs and garbage outputs.