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Angular momentum characterizes an object's rotational motion and is defined as the moment of its linear momentum about a specified point O. When a particle moves along a curved path in the x-y plane, the scalar formulation calculates the magnitude of its angular momentum, utilizing the moment arm (d), representing the perpendicular distance from point O to the line of action of the linear momentum. Despite being scalar in formulation, angular momentum is inherently a vector quantity. Its...
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    Area of Science:

    • Photonics and Optical Communications
    • Integrated Optics
    • Information Technology

    Background:

    • Orbital angular momentum (OAM) multiplexing is crucial for enhancing optical communication capacities.
    • Existing OAM (de)multiplexing technologies often involve complex structures.
    • Silicon photonics offers a promising platform for integrated optical devices.

    Purpose of the Study:

    • To demonstrate a novel, simple silicon-integrated orbital angular momentum (de)multiplexer.
    • To achieve efficient conversion of waveguide modes to free-space OAM beams.
    • To validate chip-to-chip OAM multiplexing transmission with high performance.

    Main Methods:

    • Utilizing a multimodal micro-ring resonator to tap evanescent waves of whispering gallery modes.
    • Converting four in-plane waveguide modes into four free-space vector OAM beams.
    • Implementing a pair of silicon devices for chip-to-chip OAM multiplexing transmission.

    Main Results:

    • Achieved high mode purity in the generated free-space vector OAM beams.
    • Demonstrated successful chip-to-chip OAM multiplexing transmission.
    • Observed low mode crosstalk and favorable overall link performance.

    Conclusions:

    • The developed silicon integrated OAM (de)multiplexer offers a simple and effective solution for future optical communication systems.
    • This technology paves the way for increased communication capacities through OAM multiplexing.
    • The demonstrated chip-to-chip transmission highlights the practical viability of silicon-based OAM devices.