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Efficient sorting for an orbital angular momentum multiplexing communication link based on a digital micromirror

Zhaoyuan Zhang, Xiaoli Yin, Yuhang Liu

    Optics Express
    |February 25, 2022
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel complex amplitude wavefront shaping (WS) technique for efficiently sorting multiple orbital angular momentum (OAM) modes. The new method demonstrates higher accuracy and speed in OAM demultiplexing compared to existing phase-only WS techniques.

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    Area of Science:

    • Optical communications
    • Photonics
    • Light manipulation

    Background:

    • Orbital angular momentum (OAM) multiplexing offers high-capacity communication potential.
    • Efficiently sorting multiple OAM modes is crucial for practical OAM multiplexing systems.
    • Wavefront shaping (WS) techniques enable control over light scattering for mode manipulation.

    Purpose of the Study:

    • To develop and evaluate a novel complex amplitude WS scheme for faster and more accurate sorting of multiplexed OAM modes.
    • To compare the performance of the complex amplitude WS sorter with existing phase-only WS sorters.
    • To experimentally verify the proposed complex amplitude WS sorter's effectiveness.

    Main Methods:

    • Simulated a complex amplitude WS sorter using a digital micromirror device (DMD) to shape both phase and amplitude of OAM modes.
    • Performed performance comparison with phase-only WS sorters through simulations.
    • Experimentally validated the sorter's performance for demultiplexing arbitrary OAM modes.

    Main Results:

    • The complex amplitude WS sorter achieved a high detection probability (>0.99) for two multiplexed OAM modes.
    • For seven multiplexed modes, the complex sorter's detection probability reached ~0.82, outperforming phase-only sorters (~0.71).
    • Experimental results confirmed high detection probabilities and superior performance of the complex sorter over phase-only methods.

    Conclusions:

    • The complex amplitude WS sorter provides a significant advancement for efficient and rapid demultiplexing of multiple OAM spatial modes.
    • This technique holds promise for enhancing the capacity and performance of OAM multiplexing communication systems.
    • The developed sorter offers a practical solution for advanced optical communication applications.