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    Researchers developed a novel photonic lantern to simultaneously generate and multiplex optical vortex beams carrying orbital angular momentum (OAM). This breakthrough offers low loss and broad spectral range for advanced optical applications.

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    Area of Science:

    • Optics and Photonics
    • Fiber Optics
    • Quantum Technologies

    Background:

    • Optical vortex beams with orbital angular momentum (OAM) offer unique properties for advanced applications.
    • Current methods for OAM mode generation and multiplexing face limitations in loss and spectral range.
    • A demand exists for efficient, simultaneous OAM mode generation and multiplexing.

    Purpose of the Study:

    • To demonstrate a novel photonic lantern for simultaneous OAM mode generation and multiplexing.
    • To achieve low loss and a broad spectral range for OAM mode generation.
    • To assess the preservation of OAM mode quality using the developed device.

    Main Methods:

    • Design and fabrication of a novel photonic lantern, neglecting the radial mode index.
    • Simultaneous generation and multiplexing of OAM modes using the photonic lantern.
    • Fusion splicing the photonic lantern to a ring-core fiber (RCF) for quality assessment.

    Main Results:

    • Successful simultaneous generation and multiplexing of OAM modes.
    • Achieved the broadest spectral range (550 nm) for OAM mode generation to date.
    • Demonstrated low loss in the generation and multiplexing process.
    • Confirmed OAM mode quality preservation when coupled to an RCF.

    Conclusions:

    • The novel photonic lantern enables efficient, simultaneous OAM mode generation and multiplexing.
    • This approach significantly expands the spectral range for OAM applications.
    • The technology shows promise for preserving OAM mode quality in fiber optic systems.