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Integrated orbital angular momentum mode sorters on vortex fibers.

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    Researchers developed integrated mode sorters for multimode fibers, enabling efficient sorting of vortex modes for optical communication. This technology enhances data multiplexing using orbital angular momentum (OAM).

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    Area of Science:

    • Optoelectronics and Optical Communications
    • Photonics and Integrated Optics

    Background:

    • Multimode fibers can guide multiple light modes, offering higher data capacity.
    • Vortex modes, characterized by orbital angular momentum (OAM), are promising for advanced optical communication.
    • Efficiently sorting and routing these modes is crucial for practical applications.

    Purpose of the Study:

    • To design, fabricate, and characterize integrated mode sorters for multimode fibers guiding vortex modes.
    • To demonstrate a compact and robust device for sorting multiple OAM modes.
    • To enable widespread exploitation of OAM for space division multiplexed optical communication.

    Main Methods:

    • Utilized 3D direct laser printing to fabricate a collimator and a Cartesian to log-polar mode transformer.
    • Integrated these components onto the tip of vortex fibers.
    • Characterized the performance of the mode sorters with two types of fibers, sorting four or eight modes.

    Main Results:

    • Successfully designed and fabricated polarization-insensitive integrated mode sorters.
    • Demonstrated the ability to sort different vortex modes into distinct exit angles.
    • Achieved compact and robust sorting of either four or eight different modes.

    Conclusions:

    • The integrated mode sorters are effective for separating vortex modes in multimode fibers.
    • This technology facilitates space division multiplexing for enhanced optical communication.
    • Integration of vortex fibers and multiplexers paves the way for practical OAM-based data multiplexing.