Signal quality enhanced and multicast transmission via cylindrical vector beams with adaptive optics compensation in free space optical communications

Signal quality is critical in free space optical (FSO) communications. Many technologies and methods are applied to enhance the signal quality of an optical communication system, which might require one of the methods employing structured light. We introduce structured light of cylindrical vector beams with adaptive optics compensation to improve signal quality in FSO communications. The multiplexing/demultiplexing of coaxial cylindrical vector beams is used to increase the capacity of the communication channel. Adaptive optics compensation and cylindrical vector beams are applied to mitigate influence of the turbulent atmospheric disturbances and improve the signal quality. An optical vortex grating is employed to demultiplex signal beams and then send the signals to a receiver plane to measure the bit-error-rate. Consequently, the signal quality of the cylindrical vector beams multiplexing/demultiplexing in FSO communication systems improves.