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Orbital angular momentum mode-demultiplexing scheme with partial angular receiving aperture.

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    A new partial receiving scheme for orbital angular momentum (OAM) communications uses a restricted aperture to receive multiple OAM modes. This method overcomes challenges of large apertures and saves space and cost in OAM optical and RF systems.

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    Area of Science:

    • Optical communications
    • Wireless communications
    • Signal processing

    Background:

    • Orbital angular momentum (OAM) based transmission offers high capacity for long-distance communication.
    • Conventional whole beam receiving schemes struggle with large apertures due to OAM beam divergence.
    • This limits the practical application of OAM in optical and radio frequency (RF) systems.

    Purpose of the Study:

    • To propose and validate a novel partial receiving scheme for multi-OAM-mode beam demultiplexing.
    • To address the challenge of large receiving apertures in long-distance OAM communications.
    • To demonstrate space and cost savings for OAM communication systems.

    Main Methods:

    • Theoretical analysis of a partial receiving scheme with a restricted angular aperture.
    • Mathematical demonstration of the orthogonality preservation for regularly spaced OAM modes.
    • Experimental verification of the proposed scheme's feasibility for demultiplexing multi-OAM-mode beams.

    Main Results:

    • The partial receiving scheme effectively receives and demultiplexes multi-OAM-mode beams.
    • Regularly spaced OAM modes maintain orthogonality within the restricted angular aperture.
    • Experimental results confirm the theoretical predictions and feasibility of the scheme.

    Conclusions:

    • The proposed partial receiving scheme offers a practical solution for long-distance OAM communications.
    • It significantly reduces the required aperture size, saving space and cost.
    • The scheme is applicable to both free-space optical and RF OAM communication systems.