Wave-front restoration of orbital-angular-momentum beam based on phase diversity with GRNN

Yuanzhi Su; Xiaoli Yin; Huan Chang; Zhaoyuan Zhang; Yuhang Liu

doi:10.1117/12.2605890

15 September 2021 Wave-front restoration of orbital-angular-momentum beam based on phase diversity with GRNN

Yuanzhi Su, Xiaoli Yin, Huan Chang, Zhaoyuan Zhang, Yuhang Liu

Proceedings Volume 11915, International Conference on Optics and Image Processing (ICOIP 2021); 1191507 (2021) https://doi.org/10.1117/12.2605890
Event: International Conference on Optics and Image Processing (ICOIP 2021), 2021, Guilin, China

Abstract

Orbital angular momentum (OAM) of vortex beams can extend the capacity and spectral efficiency of free-space optical (FSO) communication for its orthogonality provide an extra dimension. However, atmospheric turbulence (AT) will lead to wave-front distortion, crosstalk between OAM modes and eventually reduce the communication system performance. This paper uses a Phase Diversity (PD)-based adaptive optics (AO) schema to compensate the OAM beam. With the General Regression Neural Network (GRNN), the relationship between the intensity distribution and the wave-front distortion of propagation in AT channel is established, and the wave-front aberration is retrieved. This method is simple in structure without phase sensor and probe beam, and reduces computation compared with the common phase retrieval algorithms. Therefore, it can compensate OAM beam in a second and ensure the similar retrieve effect.

Citation Download Citation

Yuanzhi Su, Xiaoli Yin, Huan Chang, Zhaoyuan Zhang, and Yuhang Liu "Wave-front restoration of orbital-angular-momentum beam based on phase diversity with GRNN", Proc. SPIE 11915, International Conference on Optics and Image Processing (ICOIP 2021), 1191507 (15 September 2021); https://doi.org/10.1117/12.2605890

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