The design of all-optical not and or gates based on 2×1 MMI couplers on an soi platform

Abstract

In this paper, a general theory for designing optical logic gates based on 2x1 multimode interference (MMI) structures is presented. Designsfor a set of optical logic gates using silicon on insulator (SOI) channel waveguide structures are proposed and optimised. It is shown that this single structure can be used to  implement a variety of optical logic and other functions. These devices are optimised by the three dimensional propagation method (3D-BPM).