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Dual-comb fiber laser for stable frequency distribution.

Shangsu Ding, Jianming Shang, Mingwen Zhu

    Optics Express
    |May 8, 2023
    PubMed
    Summary

    This study introduces a novel passive dual-comb fiber laser. It achieves a high repetition frequency difference, crucial for frequency distribution, with enhanced stability over long fiber links.

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    Area of Science:

    • Quantum Optics
    • Laser Physics
    • Optical Communications

    Background:

    • Passive dual-comb lasers generate two coherent optical frequency combs with distinct repetition frequencies.
    • High repetition frequency differences are essential for comb-based frequency distribution applications.
    • Existing methods often require complex phase-locking mechanisms.

    Purpose of the Study:

    • To present a novel bidirectional dual-comb fiber laser with a high repetition frequency difference.
    • To demonstrate the laser's performance using an all-polarization-maintaining cavity and a semiconductor saturable absorption mirror.
    • To evaluate the frequency stability of the repetition frequency difference signal after transmission through an optical fiber.

    Main Methods:

    • Development of a bidirectional dual-comb fiber laser employing an all-polarization-maintaining cavity.
    • Integration of a semiconductor saturable absorption mirror for single polarization output.
    • Characterization of the laser's repetition frequency stability and performance in a transmission experiment.

    Main Results:

    • The proposed dual-comb laser achieved a repetition frequency difference with a standard deviation of 69 Hz and an Allan deviation of 1.17 × 10-7 at τ = 1 s.
    • The repetition frequencies were measured at 12.815 MHz.
    • After transmission through an 84 km fiber link, the frequency stability of the repetition frequency difference signal improved by two orders of magnitude compared to the repetition frequency signal.

    Conclusions:

    • The developed dual-comb fiber laser effectively generates a high repetition frequency difference with excellent stability.
    • The passive common-mode noise rejection capability significantly enhances signal stability over long fiber links.
    • This technology holds promise for robust optical frequency distribution and related applications.