Mr. Yongchuang Chen Profile

Yongchuang Chen

at Nanjing Univ

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Proceedings Article | 18 June 2021 Paper

CNN-based mode analysis of orbital angular momentum beams in atmospheric turbulence

Yongchuang Chen, Jincheng Zou, Yaguang Xu, Xudong Yuan, Ronger Lu, RuiZhi Zhao, Xia Feng, Chao Zhang, Yiqiang Qin, Yongyuan Zhu

Proceedings Volume 11850, 118500T (2021) https://doi.org/10.1117/12.2599573

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The atmospheric turbulence disturbs the phase fronts of orbital angular momentum (OAM) beams, which significantly affects the detection of beam modes. In this paper, we propose a method based on the convolutional neural network (CNN) to detect OAM modes in atmospheric turbulence. This method does not require a separate system to suppress the influence of atmospheric turbulence. The propagation of multimode OAM beams in atmospheric turbulence is simulated by setting several random phase screens in the transmission channel. We select three levels of atmospheric turbulence. In all these cases, the predicted error of the trained CNN is lower than 2 ×10^-5 , which indicates that our network can detect the mode distribution in multimode OAM beams efficiently and accurately. We believe that this approach for detecting OAM modes holds great promise for potential applications and will provide widespread benefits for many optical fields.

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