Crosstalk Among OAM Modes Through Air Channel: A Simulation Perspective

OAM modes can be used to increase the information capacity in the free-space optical (FSO) communication systems. The air turbulence, however, contaminates the wavefront of OAM-carrying beam. The crosstalk among OAM modes are induced, which degrades the performance of FSO systems significantly. We studied the crosstalk among OAM modes resulting from the air turbulence from a simulation perspective in this paper. The OAM-carrying beam propagating through air channel has been emulated by Monte-Carlo phase screen and Fresnel diffraction approaches. The numerical results revealed that the air turbulence effect could induce the partial energy of transmitted OAM mode leaking into its neighboring modes, thus causes the crosstalk remarkably.