Improvement of communication quality in Laguerre-Gaussian mode multiplexing through atmospheric turbulence propagation for optical wireless communication

The recent rapid increase in communication traffic has led to the development of 6G technology, and high-frequency carrier wave bands have been studied toward the implementation of this technology. Ultrahigh-speed and high-capacity communication are also required for backhaul lines. One of the methods to realize the above is orbital angular momentum (OAM) mode multiplexing communication. To this end, a mode multiplexing system that can simultaneously separate multiple modes with a single filter using multiplexed holograms as mode demultiplexing filters has been realized using Laguerre-Gaussian (LG) beams extending the OAM. However, the receiving aperture, LG mode combination guideline to reduce crosstalk, and feasible optical wireless communication have not been investigated. Therefore, in this study, we implemented LG mode multiplexing from the viewpoint of the receiving aperture and mode combination involving long-distance propagation through atmospheric turbulence.