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    Area of Science:

    • Photonics
    • Microwave Engineering
    • Materials Science

    Background:

    • Integrated optoelectronic oscillators (OEOs) face challenges with high losses and instability on chip-based platforms.
    • Achieving high-quality, tunable microwave signals from integrated devices is crucial for advanced communication systems.

    Purpose of the Study:

    • To present an injection-locked tunable integrated OEO on a thin-film lithium niobate platform.
    • To mitigate the inherent limitations of chip-based OEOs, improving signal quality and stability.

    Main Methods:

    • Utilized a thin-film lithium niobate platform for OEO integration.
    • Implemented an injection-locking technique to stabilize and enhance OEO performance.
    • Characterized the OEO's frequency tunability, side-mode suppression ratio (SMSR), and phase noise.

    Main Results:

    • Generated continuous frequency-tunable radio frequency signals from 7.5 to 22.5 GHz.
    • Achieved a highest reported SMSR of 84 dB and phase noise of -114 dBc/Hz@10 kHz with injection locking.
    • Demonstrated improved operational stability and reduced reliance on ultra-high-Q filtering.

    Conclusions:

    • The injection-locked tunable integrated OEO on thin-film lithium niobate effectively overcomes limitations of previous chip-based platforms.
    • This approach enables high-quality, stable, and tunable microwave signal generation under realistic fabrication constraints.
    • The study paves the way for practical integrated microwave systems.