Ren Yongxiong, Xie Guodong, Huang Hao, Bao Changjing, Yan Yan, Ahmed Nisar, Lavery Martin P J, Erkmen Baris I, Dolinar Samuel, Tur Moshe, Neifeld Mark A, Padgett Miles J, Boyd Robert W, Shapiro Jeffrey H, Willner Alan E
Opt Lett. 2014 May 15;39(10):2845-8. doi: 10.1364/OL.39.002845.
We propose an adaptive optics compensation scheme to simultaneously compensate multiple orbital angular momentum (OAM) beams propagating through atmospheric turbulence. A Gaussian beam on one polarization is used to probe the turbulence-induced wavefront distortions and derive the correction pattern for compensating the OAM beams on the orthogonal polarization. By using this scheme, we experimentally demonstrate simultaneous compensation of multiple OAM beams, each carrying a 100 Gbit/s data channel through emulated atmospheric turbulence. The experimental results indicate that the correction pattern obtained from the Gaussian probe beam could be used to simultaneously compensate multiple turbulence-distorted OAM beams with different orders. It is found that the turbulence-induced crosstalk effects on neighboring modes are efficiently reduced by 12.5 dB, and the system power penalty is improved by 11 dB after compensation.
我们提出了一种自适应光学补偿方案，用于同时补偿在大气湍流中传播的多个轨道角动量（OAM）光束。利用一个偏振方向上的高斯光束来探测湍流引起的波前畸变，并推导用于补偿正交偏振方向上OAM光束的校正图案。通过使用该方案，我们通过模拟大气湍流实验证明了对多个OAM光束的同时补偿，每个光束承载一个100 Gbit/s的数据通道。实验结果表明，从高斯探测光束获得的校正图案可用于同时补偿不同阶数的多个受湍流畸变的OAM光束。研究发现，湍流引起的相邻模式间的串扰效应有效降低了12.5 dB，补偿后系统的功率代价改善了11 dB。
