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    We analyzed orbital angular momentum (OAM) propagation in twisted, tapered optical fibers. Our unified model shows efficient power transfer between OAM modes in these complex fiber structures.

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    Area of Science:

    • Optical physics
    • Photonics
    • Fiber optics

    Background:

    • Orbital angular momentum (OAM) modes offer new possibilities for optical communications.
    • Controlling OAM mode propagation in optical fibers is crucial for practical applications.
    • Tapered and twisted fiber structures present unique challenges for mode propagation.

    Purpose of the Study:

    • To analyze the propagation dynamics of OAM-carrying fiber modes in twisted, tapered, ring-core optical fibers.
    • To develop a unified theoretical framework for understanding mode coupling in such fibers.
    • To investigate efficient power transfer mechanisms between different OAM modes.

    Main Methods:

    • Generalization of the coupled-mode approach to include twisting and tapering effects.
    • Development of a unified coupled-mode framework incorporating arbitrary perturbations.
    • Theoretical analysis of vortex mode propagation in twisted ring-core fibers.

    Main Results:

    • Demonstration of efficient power transfer between different OAM modes.
    • The proposed model is the first unified framework to incorporate tapering, twisting, and arbitrary perturbations.
    • Gained clear insights into the dynamics of vortex modes in twisted ring-core fibers.

    Conclusions:

    • The developed coupled-mode framework accurately describes OAM mode propagation in complex fiber geometries.
    • Efficient power transfer between OAM modes is achievable in twisted, tapered ring-core fibers.
    • This work provides a foundation for designing advanced optical fiber devices for OAM manipulation.