关键词: 汉克-贝塞尔光束/
轨道角动量/
海洋湍流/
螺旋相位谱
English Abstract
Analysis of orbital angular momentum spectra of Hankel-Bessel beams in channels with oceanic turbulence
Yin Xiao-Li1,2,Guo Yi-Lin1,2,
Yan Hao3,
Cui Xiao-Zhou1,2,
Chang Huan1,2,
Tian Qing-Hua1,2,
Wu Guo-Hua1,
Zhang Qi1,2,
Liu Bo4,
Xin Xiang-Jun1,2
1.School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China;
2.Beijing Key Laboratory of Space-Ground Interconnection and Convergence, Beijing University of Posts and Telecommunications, Beijing 100876, China;
3.School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China;
4.School of Physics and Optoelectronic Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China
Fund Project:Project supported by the National Natural Science Foundation of China (Grant Nos. 61575027, 61471051, 61575026).Received Date:22 January 2018
Accepted Date:24 February 2018
Published Online:05 June 2018
Abstract:Beams with different-mode-number (l) orbital angular momenta (OAMs) are mutually orthogonal to each other, which makes it possible to enlarge the channel capacity in an OAM multiplexed underwater optical communication (UOC) system. Nevertheless, the implementation of this strategy is limited by oceanic turbulence. Hankel-Bessel (HB) vortex beams carrying OAM are relatively less affected by atmospheric turbulence due to their ability to propagate without changing the intensity profile (non-diffraction nature) and remarkable ability to be reconstructed after encountering an obstacle (self-healing mechanism). Consequently, HB vortex beams can be used as the carriers to increase the channel capacity of information transmission. In this paper, based on the Rytov approximation theory, the analytical expressions of OAM spectra for HB vortex beams under weak horizontal oceanic turbulent channels are derived. The influences of oceanic turbulence parameters on the OAM spectra of HB vortex beams are investigated via numerical calculations. The results indicate that oceanic turbulence leads to the decline of detection probability of transmitted OAM mode and the broadening of OAM spectra as well. Similarly, the spatial coherence length in oceanic turbulence decreases with increasing propagation distance and the dissipation rate of mean-squared temperature and with decreasing the dissipation rate of turbulent kinetic energy, which lead to the decline of detection probability of transmitted OAM mode for HB vortex beams. On the other hand, beams with larger OAM mode numbers each have a wider beam spreading after propagating in the turbulence, which results in the decrease of the detection probability for transmitted OAM modes of HB vortex beams. And the HB vortex beams are more affected by salinity fluctuation than by temperature fluctuations, which indicates that salinity fluctuations are much more effective than temperature fluctuations in determinating the effect of oceanic turbulence. In addition, for weak turbulence and a distance of several tens of meters, the transmission performance of HB vortex beams is worse than that of Laguerre-Gaussian vortex beams with the optimal waist setting. These results provide references for the realization of optical communication links in the marine environment.
Keywords: Hankel-Bessel beam/
orbital angular momentum/
oceanic turbulence/
orbital angular momentum spectra
