中国激光, 2019, 46 (11): 1105001, 网络出版: 2019-11-09
空间光到单模光纤章动耦合技术研究 下载: 1610次
Spatial Light to Single-Mode Fiber Nutation Coupling Technology
光纤光学 空间激光通信 单模光纤耦合 激光章动 耦合效率 fiber optics space laser communications single-mode fiber coupling laser nutation coupling efficiency
摘要
阐述了空间光到单模光纤耦合原理,设计了基于快速反射镜结合光纤光电探测器的章动耦合算法,在LabVIEW环境下仿真了光纤端面章动的动态跟踪过程,并进行了激光章动系统耦合实验,实现了静态条件下59.63%的耦合效率,进行了1.65 GHz码速率的视频传输演示与扰动实验,验证了章动耦合算法的有效性与可行性。通过实验与仿真数据结果,分析了章动算法参数中章动半径、收敛步长与章动单周采样点数对耦合性能的影响。结果表明,在光纤端面当章动半径从0.1 μm增加到2.5 μm时,耦合效率与耦合稳定性下降,耦合速率无明显变化,但章动半径过小会导致收敛角度识别误差增大,降低耦合速率;当收敛步长从0.1 μm增加到2.5 μm时,耦合效率与耦合稳定性下降,耦合速率上升;当章动单周采样点数从100减少到5时,耦合效率与耦合稳定性无明显变化趋势,但由于采样点数过少,收敛角度分辨率降低,耦合速率明显下降。
Abstract
This study describes the spatial light to single-mode fiber coupling principle, designs a nutation coupling algorithm based on a combination of fast mirror and fiber photodetector, and simulates the dynamic tracking process of the fiber end surface using LabVIEW. According to the simulation, the coupling experiments of laser nutation system are conducted, resulting in a coupling efficiency of 59.63% under static conditions and a video transmission demonstration with 1.65-GHz code rate. Further, the validity and feasibility of the nutation coupling algorithm are verified. Based on the experimental and simulation results, the study analyzes the influences of the nutation parameters, including the nutation radius, convergence step length, and number of nutation sampling points, on the coupling performance. The results denote that when the nutation radius increases from 0.1 μm to 2.5 μm, the coupling efficiency and stability decrease, whereas the coupling rate does not exhibit a significant change. However, when the nutation radius is considerably small, the convergence angle recognition error will increase, whereas the coupling speed will decrease. When the convergence step increases from 0.1 μm to 2.5 μm, the coupling efficiency and coupling stability decrease,and the coupling rate increases. When the number of nutation sampling points is reduced from 100 to 5, the coupling efficiency and stability have no obvious change. However, due to too few sampling points, the convergence angle resolution decreases and the coupling rate decreases significantly.
赵佰秋, 孟立新, 于笑楠, 张立中, 佟首峰. 空间光到单模光纤章动耦合技术研究[J]. 中国激光, 2019, 46(11): 1105001. Baiqiu Zhao, Lixin Meng, Xiaonan Yu, Lizhong Zhang, Shoufeng Tong. Spatial Light to Single-Mode Fiber Nutation Coupling Technology[J]. Chinese Journal of Lasers, 2019, 46(11): 1105001.