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    Area of Science:

    • Photonics
    • Materials Science
    • Electrical Engineering

    Background:

    • Integrated photonics platforms are crucial for advanced optical communication.
    • Achieving ultrahigh-speed modulation is a key challenge in optical systems.
    • Thin-film lithium niobate offers promising electro-optic properties.

    Purpose of the Study:

    • To demonstrate the feasibility of ultrahigh-speed electro-optic modulators on a thin-film lithium niobate platform.
    • To provide design guidelines for optimizing modulator performance.
    • To achieve modulation bandwidths in the subterahertz range.

    Main Methods:

    • Device fabrication on a thin-film lithium niobate integrated photonic platform.
    • Design and optimization of radio-frequency and optical parameters.
    • Experimental characterization of modulation bandwidth.

    Main Results:

    • Ultrahigh-speed electro-optic modulation is feasible.
    • Design guidelines for parameter optimization were established.
    • A 3-dB modulation bandwidth of up to 400 GHz was achieved in 3-mm-long devices.

    Conclusions:

    • Thin-film lithium niobate integrated photonics can support subterahertz modulation bandwidths.
    • The developed design guidelines facilitate the creation of high-performance modulators.
    • These ultrahigh-bandwidth modulators are suitable for advanced optical communication systems.