Research and Progress on Orbital Angular Momentum Based Free Space Optical Communication

Using orbital angular momentum(OAM)of optics can effectively increase the rate of information transmission of optical communication system.The basic concepts and main characteristics of OAM are introduced;the basic principles and typical systems of the OAM-based free space optical communication are overviewed.In addition,the corresponding key techniques are analyzed.Based on the which,the potential applications and developing trends of the OAMbased free space optical communication are also forecasted.