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提出了基于现场可编程逻辑门阵列(FPGA)硬件控制平台将空间激光耦合至单模光纤(SMF)的自适应耦合技术。将自适应光纤耦合器作为激光接收器件和像差校正器件,使用基于随机并行梯度下降(SPGD)算法的FPGA硬件控制平台实现SMF端面对聚焦光斑的自适应跟踪,算法的双边迭代速率达到了3kHz。实验结果表明,该控制系统可补偿SMF接收端面最大约9μm的静态对准偏差(对应空间光束的最大可校正静态角偏差为600μrad),对于模拟大气湍流造成的耦合效率下降具有150Hz的校正带宽。
An adaptive coupling technique based on field programmable gate array (FPGA) hardware control platform to couple space laser to single mode fiber (SMF) is proposed. The adaptive fiber coupler is used as the laser receiver and aberration correction device. The FPGA hardware control platform based on Stochastic Parallel Gradient Degradation (SPGD) algorithm is used to adaptively track the focused spot of the SMF. The bilateral iteration rate of the algorithm reaches 3kHz. The experimental results show that this control system can compensate for the static alignment error of up to 9μm at the receiving end of SMF (the maximum correctible static angular deviation of the corresponding spatial beam is 600μrad) and the correction bandwidth of 150Hz for the decoupling efficiency caused by simulated atmospheric turbulence.