锥形光纤在空间光通信耦合系统中的应用

为了提高自由空间光通信的接收端耦合效率,将锥形光纤应用于光耦合,依据BPM算法的仿真结果使用熔融拉锥法制备了满足低损传输条件的锥形光纤。在实验上研究了锥形光纤和双锥形光纤模场传输特性。通过静态空间光-光纤耦合实验,对比了多/单模熔接光纤和锥形光纤光耦合效率和传输效率的差异,并研究了以上两种光纤结构耦合效率的横向偏移量容差。结果表明,锥形光纤的传输效率约为70%,具有低损传输特性、用于匹配后端单模光电子器件的良好滤波特性以及相比普通光纤更高的横向偏移量容差特性,因此可以广泛应用于自由空间光通信接收端光耦合、模式转换器等方面。

Application of tapered fibers to free-space optical communication coupling system

Free space optical communication has many advantages over traditional communication. Improving the coupling efficiency of the free space optical communication (FSOC) receiving is of great significance for the quality of communication. We applied tapered fiber to optical coupling. Based on the simulation results of the BPM algorithm, tapered fiber with low loss transmission was prepared by fusion taper method. Firstly, the mode field transmission characteristics of tapered fiber and double tapered fiber are studied in experiment. Secondly, the difference in coupling efficiency and transmission efficiency between multi/single mode fused fiber and tapered fiber has been studied by static spatial light-fiber coupling experiment. We also studied the lateral offset tolerance of the coupling efficiency of the above two fiber structures. The results show that tapered fiber has good filtering characteristics for matching single-mode optoelectronic devices in the back end, higher lateral offset tolerance characteristics than common fibers, and high transmission efficiency of about 70%, which proves its low-loss transmission characteristics. Therefore, it can be widely applied to the optical coupling of the FSOC receiving, mode converter, ect.