提出一种前端直接耦合光纤平凸透镜的聚合物直光锥光束准直系统。通过具体地对直光锥的端体结构参数进行优化设计以得到高耦合效率高准直精度的直接耦合式聚合物直光锥准直系统。并利用光线传输理论和仿真实验,论证了直光锥的锥角和锥长对准直效能的较大影响。结果表明,选择合适的锥角和锥长能达到十微弧度级的准直精度,能较好地满足空间光通信系统远距离发射和接收对于光束质量的要求。此外,理论数值和仿真实验同样验证了该直接耦合式直光锥准直系统对于较大发散角的发散光束具有较好的准直效果。 A kind of polymer straight light cone beam collimation system with front-end direct coupling fiber plano-convex lens is proposed. The direct coupling polymer straight-light cone collimation system with high coupling efficiency and high collimation accuracy is designed by specifically designing the structural parameters of the straight-light cone. And the light transmission theory and simulation experiment are used to demonstrate the great influence of the cone angle and the cone length of the straight light cone on the collimation efficiency. The results show that the selection of suitable cone angle and cone length can achieve the collimation accuracy of the order of ten microradians, which can meet the requirement of beam quality for long-range transmission and reception in space optical communication system. In addition, the theoretical numerical and simulation experiments also verify that the direct coupling straight-cone collimation system has good collimation effect for the divergent beam with larger divergence angle.