Four-mode filter for mode division multiplexing optical communication systems

Handling multiple spatial modes using mode-division multiplexing (MDM) on the platform of integrated photonic chip enables unprecedented communication bandwidth scaling for on chip communication. Significant research effort has been done in past decades on MDM system for exploring efficient mode handling devices. In this paper we have proposed a higher order mode pass filter which has the provision of handling four different modes and pass the highest order mode among them. This four mode filter unfolds multiple modes to deal with which can provide a more flexible operation of MDM system.