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Updated: Aug 23, 2025

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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All-optical polarimeter for laser Stokes vector measurement using self-induced nonlinear phase modulation.

Ole Krarup, Chams Baker, Liang Chen

    Optics Express
    |October 27, 2022
    PubMed
    Summary
    This summary is machine-generated.

    This study uses the Kerr effect in nonlinear fiber to all-optically determine a laser's polarization state. Measuring sideband power accurately recovers the state of polarization (SOP) without fixed polarizers.

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    Area of Science:

    • Nonlinear optics
    • Fiber optics
    • Polarimetry

    Background:

    • Characterizing the state of polarization (SOP) is crucial for optical systems.
    • All-optical methods offer advantages over traditional polarimetry.
    • The Kerr effect in nonlinear fibers enables unique light-matter interactions.

    Purpose of the Study:

    • To develop an all-optical method for determining laser SOP using frequency sideband generation.
    • To theoretically and experimentally validate a model relating sideband power to SOP.
    • To enable SOP measurement without relying on external reference polarizers.

    Main Methods:

    • Utilizing an analytical model of polarization-dependent frequency sideband generation.
    • Employing the Kerr effect in a highly nonlinear fiber.
    • Experimentally measuring the power of the first-order sideband generated by two lasers.

    Main Results:

    • Theoretical analysis showed sideband power is proportional to cos^2n(α/2), where α is the angle between SOPs.
    • Experimental recovery of SOP with an error <10.22° (0.8% of Poincaré sphere area).
    • Demonstrated successful SOP determination by measuring first-order sideband power.

    Conclusions:

    • An all-optical method for laser SOP determination based on the Kerr effect was successfully implemented.
    • The method allows for SOP comparison between two lasers without fixed polarizers.
    • Potential applications include remote sensing, advanced telecommunications, and scientific instrumentation.