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Frequency-modulated microwave generation with feedback stabilization using an optically injected semiconductor laser.

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    Semiconductor lasers generate frequency-modulated continuous-wave (FMCW) microwave signals using period-one dynamics. Feedback reduces phase noise and enhances signal contrast, enabling wide frequency tuning for FMCW applications.

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    Area of Science:

    • Photonics and Optics
    • Microwave Engineering
    • Semiconductor Device Physics

    Background:

    • Frequency-modulated continuous-wave (FMCW) microwave signal generation is crucial for various applications.
    • Semiconductor lasers offer potential for compact and tunable microwave signal sources.
    • Period-one (P1) dynamics in semiconductor lasers present an avenue for novel signal generation.

    Purpose of the Study:

    • To investigate the generation of FMCW microwave signals utilizing the period-one (P1) dynamics of a semiconductor laser.
    • To explore methods for reducing phase noise and enhancing the performance of these FMCW signals.
    • To demonstrate the tunability and wide sweep range achievable with this laser-based approach.

    Main Methods:

    • Employing modulated optical injection to drive a single-mode semiconductor laser into P1 oscillation.
    • Implementing optical feedback to the injection-locked laser system.
    • Analyzing the frequency comb contrast and sweep characteristics of the generated FMCW signals.

    Main Results:

    • Achieved generation of FMCW microwave signals with tunable central frequencies.
    • Demonstrated a wide frequency sweep range of 7.7 GHz at a sweep rate of 0.42 GHz/ns.
    • Observed a 30 dB increase in frequency comb contrast due to feedback stabilization when modulation frequency matched the reciprocal of feedback delay time, significantly reducing microwave phase noise.

    Conclusions:

    • Period-one dynamics in semiconductor lasers provide a viable method for generating tunable FMCW microwave signals.
    • Optical feedback is effective in reducing phase noise and improving the quality of FMCW signals.
    • The demonstrated wide sweep range and enhanced signal contrast highlight the potential of this technique for advanced microwave applications.