Properties of focused Laguerre-Gaussian beam propagating in anisotropic ocean turbulence

doi:10.1088/1674-1056/ad053c

中国物理B ›› 2024, Vol. 33 ›› Issue (2): 24208-024208.doi: 10.1088/1674-1056/ad053c

Properties of focused Laguerre-Gaussian beam propagating in anisotropic ocean turbulence

Xinguang Wang(王新光)^1,†, Yangbin Ma(马洋斌)¹, Qiujie Yuan(袁邱杰)¹, Wei Chen(陈伟)¹, Le Wang(王乐)², and Shengmei Zhao(赵生妹)^2,3,4

1 College of Science, Nanjing University of Posts and Telecommunications, Nanjing 210003, China;
2 Institute of Signal Processing and Transmission, Nanjing University of Posts and Telecommunications, Nanjing 210003, China;
3 Key Lab of Broadband Wireless Communication and Sensor Network Technology(Ministry of Education), Nanjing University of Posts and Telecommunications, Nanjing 210003, China;
4 National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China

收稿日期:2023-08-10 修回日期:2023-10-09 接受日期:2023-10-20 出版日期:2024-01-16 发布日期:2024-01-25
通讯作者: Xinguang Wang E-mail:xg-cgb@njupt.edu.cn
基金资助:
This work was supported by the Science and Technology Innovation Training Program of Nanjing University of Posts and Telecommunications (Grant No. CXXZD2023080), the National Natural Science Foundation of China (Grant Nos. 61871234 and 62001249), the Natural Science Foundation of Nanjing University of Posts and Telecommunications (Grant No. NY222133), and the Open Research Fund of National Laboratory of Solid State Microstructures (Grant No. M36055).

Properties of focused Laguerre-Gaussian beam propagating in anisotropic ocean turbulence

Xinguang Wang(王新光)^1,†, Yangbin Ma(马洋斌)¹, Qiujie Yuan(袁邱杰)¹, Wei Chen(陈伟)¹, Le Wang(王乐)², and Shengmei Zhao(赵生妹)^2,3,4

1 College of Science, Nanjing University of Posts and Telecommunications, Nanjing 210003, China;
2 Institute of Signal Processing and Transmission, Nanjing University of Posts and Telecommunications, Nanjing 210003, China;
3 Key Lab of Broadband Wireless Communication and Sensor Network Technology(Ministry of Education), Nanjing University of Posts and Telecommunications, Nanjing 210003, China;
4 National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China

Received:2023-08-10 Revised:2023-10-09 Accepted:2023-10-20 Online:2024-01-16 Published:2024-01-25
Contact: Xinguang Wang E-mail:xg-cgb@njupt.edu.cn
Supported by:
This work was supported by the Science and Technology Innovation Training Program of Nanjing University of Posts and Telecommunications (Grant No. CXXZD2023080), the National Natural Science Foundation of China (Grant Nos. 61871234 and 62001249), the Natural Science Foundation of Nanjing University of Posts and Telecommunications (Grant No. NY222133), and the Open Research Fund of National Laboratory of Solid State Microstructures (Grant No. M36055).

摘要/Abstract

摘要： We analyze the properties of a focused Laguerre-Gaussian (LG) beam propagating through anisotropic ocean turbulence based on the Huygens-Fresnel principle. Under the Rytov approximation theory, we derive the analytical formula of the channel capacity of the focused LG beam in the anisotropic ocean turbulence, and analyze the relationship between the capacity and the light source parameters as well as the turbulent ocean parameters. It is found that the focusing mirror can greatly enhance the channel capacity of the system at the geometric focal plane in oceanic turbulence. The results also demonstrate that the communication link can obtain high channel capacity by adopting longer beam wavelength, greater initial beam waist radius, and larger number of transmission channels. Further, the capacity of the system increases with the decrease of the mean squared temperature dissipation rate, temperature-salinity contribution ratio and turbulence outer scale factor, and with the increase of the kinetic energy dissipation rate per unit mass of fluid, turbulence inner scale factor and anisotropy factor. Compared to a Hankel-Bessel beam with diffraction-free characteristics and unfocused LG beam, the focused LG beam shows superior anti-turbulence interference properties, which provide a theoretical reference for research and development of underwater optical communication links using focused LG beams.

关键词: vortex beam, orbital angular momentum, focusing mirror, anisotropic turbulence

Abstract: We analyze the properties of a focused Laguerre-Gaussian (LG) beam propagating through anisotropic ocean turbulence based on the Huygens-Fresnel principle. Under the Rytov approximation theory, we derive the analytical formula of the channel capacity of the focused LG beam in the anisotropic ocean turbulence, and analyze the relationship between the capacity and the light source parameters as well as the turbulent ocean parameters. It is found that the focusing mirror can greatly enhance the channel capacity of the system at the geometric focal plane in oceanic turbulence. The results also demonstrate that the communication link can obtain high channel capacity by adopting longer beam wavelength, greater initial beam waist radius, and larger number of transmission channels. Further, the capacity of the system increases with the decrease of the mean squared temperature dissipation rate, temperature-salinity contribution ratio and turbulence outer scale factor, and with the increase of the kinetic energy dissipation rate per unit mass of fluid, turbulence inner scale factor and anisotropy factor. Compared to a Hankel-Bessel beam with diffraction-free characteristics and unfocused LG beam, the focused LG beam shows superior anti-turbulence interference properties, which provide a theoretical reference for research and development of underwater optical communication links using focused LG beams.

Key words: vortex beam, orbital angular momentum, focusing mirror, anisotropic turbulence

中图分类号: (Wave propagation, transmission and absorption)

42.25.Bs

42.68.Ay (Propagation, transmission, attenuation, and radiative transfer) 42.68.Xy (Ocean optics)

Xinguang Wang(王新光), Yangbin Ma(马洋斌), Qiujie Yuan(袁邱杰), Wei Chen(陈伟), Le Wang(王乐), and Shengmei Zhao(赵生妹). Properties of focused Laguerre-Gaussian beam propagating in anisotropic ocean turbulence[J]. 中国物理B, 2024, 33(2): 24208-024208.

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Properties of focused Laguerre-Gaussian beam propagating in anisotropic ocean turbulence

Properties of focused Laguerre-Gaussian beam propagating in anisotropic ocean turbulence

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