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Free-space optical communications using orbital-angular-momentum multiplexing combined with MIMO-based spatial

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    This study combines multiple-input multiple-output (MIMO) and orbital angular momentum (OAM) multiplexing for free-space optical (FSO) communications. The research demonstrates an 80 Gbit/s system, achieving performance below error correction limits.

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    Area of Science:

    • Optical Communications
    • Wireless Technology
    • Signal Processing

    Background:

    • Free-space optical (FSO) communication systems face limitations in data capacity.
    • Multiple-input multiple-output (MIMO) and orbital angular momentum (OAM) multiplexing offer potential solutions.
    • Combining these techniques could overcome current FSO capacity bottlenecks.

    Purpose of the Study:

    • To investigate the synergistic potential of integrating MIMO spatial multiplexing with OAM multiplexing.
    • To enhance the data-carrying capacity of free-space optical communication systems.
    • To experimentally validate the combined approach's effectiveness and performance.

    Main Methods:

    • Development of a 2x2 aperture architecture for the FSO system.
    • Implementation of two multiplexed data-carrying OAM modes per transmitter aperture.
    • Application of 4x4 MIMO signal processing to mitigate inter-channel crosstalk.
    • Experimental demonstration of the integrated system's performance.

    Main Results:

    • Successful experimental demonstration of an 80 Gbit/s FSO system.
    • Achieved bit-error rates below the forward error correction limit (3.8×10⁻³).
    • Observed power penalties of less than 3.6 dB for all channels post-MIMO processing.

    Conclusions:

    • Simultaneous utilization of OAM and MIMO-based spatial multiplexing is feasible.
    • The combined approach significantly enhances FSO system performance.
    • This integration offers a promising pathway for future high-capacity optical wireless communication.