20 February 2018 A new version of Stochastic-parallel-gradient-descent algorithm (SPGD) for phase correction of a distorted orbital angular momentum (OAM) beam
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Abstract
Atmospheric turbulence limits the performance of orbital angular momentum-based free-space optical communication (FSO-OAM) system. In order to compensate phase distortion induced by atmospheric turbulence, wavefront sensorless adaptive optics (WSAO) has been proposed and studied in recent years. In this paper a new version of SPGD called MZ-SPGD, which combines the Z-SPGD based on the deformable mirror influence function and the M-SPGD based on the Zernike polynomials, is proposed. Numerical simulations show that the hybrid method decreases convergence times markedly but can achieve the same compensated effect compared to Z-SPGD and M-SPGD.
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LIn Jiao Ling, Yin Xiaoli, Chang Huan , Cui Xiaozhou, Guo Yi-Lin, Liao Huan-Yu, Gao Chun-YU, Wu Guohua, Liu Guang-Yao, Jiang Jin-KUn, Tian Qing-Hua, "A new version of Stochastic-parallel-gradient-descent algorithm (SPGD) for phase correction of a distorted orbital angular momentum (OAM) beam", Proc. SPIE 10697, Fourth Seminar on Novel Optoelectronic Detection Technology and Application, 106973B (20 February 2018); doi: 10.1117/12.2315106; https://doi.org/10.1117/12.2315106
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