Reversible logic has found itself to a new height ever since the semiconductor industry has observed the saturation in Moore's law along with sizable power/heat dissipation. Many overhead factors in lower nodes of conventional CMOS result in heat dissipation and it seems like an uphill task in near future to at least getting near to Landauer's limit. Though the research is just beginning to roll out, one of the potential solutions is to use optical switches, which can function at a much faster speed since photons are ultra-fast. These switches are easy to understand as the presence/absence of light defines logic '1/0' and can configure reversible gates. This paper explores a design of optimal count electro-optic Mach-Zehnder interferometer based reversible Toffoli Gate (TG) under beam propagation method. The material composition used in designing the optical switch is Titanium in diffused in Lithium Niobate. We have also studied various logic operations derived from TG. The validation of its truth table is done by simulating the mathematical power model on MATLAB. Furthermore, arithmetical application as TG gate based 1-bit full adder is also proposed along with analysis of performance metrics for single unit MZI whereas at system level by varying some of the parameters such has wavelength, diffusion constant, Ti-thickness against coupling, extinction ratio, insertion and excess loss.
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