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Multimode communication through the turbulent atmosphere.

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    Free-space optical communication can be enhanced by relating multiple-input-multiple-output (MIMO) and orbital angular momentum (OAM) modes. This study unifies these multiplexing schemes and analyzes atmospheric turbulence effects on communication modes.

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    Area of Science:

    • Optical Communications
    • Free-space Optics
    • Information Transfer

    Background:

    • Improving information transfer in free-space optical communication is crucial.
    • Multiplexing techniques like MIMO and OAM can increase channel capacity.
    • Both MIMO and OAM modes are limited by aperture size and atmospheric turbulence.

    Purpose of the Study:

    • To demonstrate the close relationship between MIMO and OAM multiplexing schemes.
    • To characterize the impact of atmospheric turbulence on communication modes.
    • To unify MIMO and OAM approaches for enhanced free-space optical communication.

    Main Methods:

    • Singular value decomposition of the transfer matrix for MIMO modes.
    • Utilizing Laguerre-Gauss vortex beams for OAM multiplexing.
    • Employing the phase screen method to model atmospheric turbulence effects.

    Main Results:

    • MIMO and OAM multiplexing schemes are shown to be closely related for circular apertures.
    • Optimal Laguerre-Gauss vortex beams for communication match MIMO singular vectors under specific conditions.
    • Atmospheric turbulence significantly affects the usable communication modes.

    Conclusions:

    • The study unifies MIMO and OAM multiplexing, offering a more comprehensive understanding of free-space optical communication.
    • The findings provide insights into optimizing mode selection for robust optical communication systems.
    • Characterizing turbulence effects is essential for reliable free-space optical links.