Spatial Mode Demultiplexer Based on Spatial Phase Filters for Optical Communication

In this paper, a spatial mode demultiplexer is proposed to recover modes which are weakly coupled in mode division multiplexed optical fiber communication systems. A spatial light modulator is employed to modulate the spatial phase as the kernel of the DEMUX. In the simulation, we explore the position of the observed plane, the phase patterns of the spatial phase filter and the group of the modes, which will exercise a great influence on the mode demultiplexing.