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Self-stabilization of an optical frequency comb using a short-path-length interferometer.

James P Cahill, Weimin Zhou, Curtis R Menyuk

    Optics Letters
    |April 29, 2017
    PubMed
    Summary

    Researchers stabilized an optical frequency comb's repetition rate using a self-referenced phase-locked loop and an 8-meter interferometer, achieving ultralow phase noise for potential chip-scale applications.

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    Area of Science:

    • Optics
    • Quantum Optics
    • Photonics

    Background:

    • Optical frequency combs are crucial for precision measurements.
    • Stabilizing their repetition rate is essential for high-fidelity applications.
    • Existing methods face limitations in phase noise performance.

    Purpose of the Study:

    • To stabilize the repetition rate of an optical frequency comb.
    • To achieve ultralow phase noise using a novel phase-locked loop design.
    • To explore the potential for chip-scale integration.

    Main Methods:

    • Utilized a self-referenced phase-locked loop (PLL).
    • Employed an 8-meter fiber-optic delay-line interferometer for the PLL error signal.
    • Generated a 10 GHz signal from the stabilized repetition rate.

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    Last Updated: Mar 3, 2026

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    Main Results:

    • Achieved a single-sideband phase noise of -120 dBc/Hz at 1 kHz offset frequency, limited by environmental noise.
    • Modeled a fundamental phase noise limit of -152 dBc/Hz at 1 kHz offset for the 8m interferometer due to thermoconductive noise.
    • Demonstrated the feasibility of using a short interferometer for PLL stabilization.

    Conclusions:

    • The developed method effectively stabilizes optical frequency comb repetition rates.
    • The results indicate potential for chip-scale integration of stabilized optical frequency combs.
    • This advancement paves the way for ultralow phase noise photonic integrated circuits.