中文摘要：

设计了一种新型的多值光学涡旋相息图，可用于直接产生多值光学涡旋，并将其应用于0AM自由空间光通信系统中，实现了4路0AM光束的复用／解复用，研究了不同比特信噪比情况下该通信系统误码率的变化。同时，探究了大气湍流对系统性能的影响。

英文摘要：

This paper designs a new multiple-valued optical vortex phase hologram which can be used to produce multiple-valued optical vortex directly, and uses it in the orbital angular momentum （OAM） free space optical communication system, realizes multiplexing/demultiplexing of 4way OAM beams, the paper study the change of the communication system bit error rate in different bit signal noise ratio. At the same time, it investigates the effect of atmospheric turbulence on the system performance.