Abstract
Atmospheric turbulence has an impact on the transmission of electromagnetic vortex waves with an orbital angular momentum (OAM) mode. In this paper, based on the joint atmospheric turbulence model, we examine the influence of atmospheric turbulence on the transmission of electromagnetic vortex waves. First, a mathematical model is established to formulate the transmission characteristics of electromagnetic vortex waves under joint atmospheric turbulence. Subsequently, in order to mitigate the influence of the atmospheric turbulence on the electromagnetic vortex waves, an adaptive compensation on phase is proposed. Finally, we analyzed the transmission performance of an OAM-mode multiplexing system using an adaptive compensation method through the wireless communication channel. By means of numerical simulation, the effect of atmospheric turbulence on the transmission characteristics and mode crosstalk of OAM is analyzed. The simulation results show that electromagnetic vortex waves could perform well on the wireless communication system with a low mode crosstalk, which provides the theoretical support to optimizing the mode division multiplexing technology in a free space communication system.
Highlights
It is well known that spectrum resource constraints and channel capacity are increasingly inadequate for the development of wireless communication systems, and how to correctly and reasonably use the existing spectrum resource has become a hot issue
Based on the joint atmospheric turbulence model, a numerical analysis method is used to analyze the crosstalk of orbital angular momentum (OAM) mode transmission in a space optical communication system
The results show that the electromagnetic vortex waves could maintain good transmission characteristics in turbulent atmosphere by adopting the method of adaptive compensation
Summary
It is well known that spectrum resource constraints and channel capacity are increasingly inadequate for the development of wireless communication systems, and how to correctly and reasonably use the existing spectrum resource has become a hot issue. For free space wireless communication, we used the properties of vortex beam to realize space-division multiplexing. It could provide orbital angular momentum (OAM) with a new degree of freedom, besides amplitude, frequency, and phase. Tyler and Boyd found the pure vortex beam carrying OAM transmissions through free space communication systems, by the propagation in the receiving port and the function between the difference intensity of atmospheric turbulence [12]. Based on the joint atmospheric turbulence model, a numerical analysis method is used to analyze the crosstalk of OAM mode transmission in a space optical communication system. The results show that the electromagnetic vortex waves could maintain good transmission characteristics in turbulent atmosphere by adopting the method of adaptive compensation. This study provides theoretical support for the wide application of mode multiplexing systems in wireless communication systems
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