Opt Express. 2023 Apr 24;31(9):13665-13671. doi: 10.1364/OE.473030.
We propose an adaptive optics (AO) pre-compensation scheme to improve the transmission quality of orbital angular momentum (OAM) beams in atmospheric turbulence. The distortion wavefront caused by atmospheric turbulence is obtained with the Gaussian beacon from the receiver. The AO system imposes the conjugate distortion wavefront onto the outgoing OAM beams at the transmitter, tto achieve the pre-compensation. Using the scheme, we conducted transmission experiments with different OAM beams in the simulated atmospheric turbulence. The experimental results indicated that the AO pre-compensation scheme can improve the transmission quality of the OAM beams in the atmospheric turbulence in real-time. It is found that the turbulence-induced crosstalk effects on neighboring modes are reduced by an average of 6 dB, and the system power penalty is improved by an average of 12.6 dB after pre-compensation.
我们提出了一种自适应光学（AO）预补偿方案，以提高轨道角动量（OAM）光束在大气湍流中的传输质量。利用接收器中的高斯信标获得由大气湍流引起的失真波前。AO 系统在发射器处对出射 OAM 光束施加共轭失真波前，以实现预补偿。使用该方案，我们在模拟大气湍流中进行了不同 OAM 光束的传输实验。实验结果表明，AO 预补偿方案可以实时提高 OAM 光束在大气湍流中的传输质量。结果发现，预补偿后，相邻模式间的湍流诱导串扰效应平均降低了 6 dB，系统功率代价平均提高了 12.6 dB。
