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Two-dimensional tunable orbital angular momentum generation using a vortex fiber.

Youchao Jiang, Guobin Ren, Ya Shen

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    We demonstrated tunable orbital angular momentum (OAM) generation in a ring-core fiber. This all-fiber OAM generator allows smooth, two-dimensional tuning of OAM states for advanced optical applications.

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    Area of Science:

    • Optical Engineering
    • Photonics
    • Fiber Optics

    Background:

    • Orbital Angular Momentum (OAM) modes offer unique properties for optical communications.
    • Controlling OAM states in fiber is crucial for developing advanced optical systems.

    Purpose of the Study:

    • To demonstrate two-dimensional tunable orbital angular momentum (OAM) generation.
    • To develop an all-fiber OAM generator with controllable OAM states.

    Main Methods:

    • Coupling LP11 mode into a ring-core (vortex) fiber.
    • Exploiting the non-degenerate vector modes within the vortex fiber.
    • Utilizing polarization filtering and wavelength tuning for OAM control.

    Main Results:

    • Achieved tunable OAM generation from l=-1 to l=+1.
    • Demonstrated smooth tuning of OAM states via polarization and wavelength.
    • Successfully generated OAM modes in an all-fiber setup.

    Conclusions:

    • The ring-core fiber enables tunable OAM generation.
    • The proposed method provides a practical all-fiber solution for OAM manipulation.
    • This work contributes to the advancement of OAM-based optical technologies.