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Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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Intensity noise-driven nonlinear fiber polarization scrambler.

Massimiliano Guasoni, Julien Fatome, Stefan Wabnitz

    Optics Letters
    |October 15, 2015
    PubMed
    Summary

    We developed a new all-optical fiber polarization scrambler using the Kerr effect to transfer intensity noise from a pump beam to a signal beam. Optimal scrambling occurs when pump and signal polarizations are orthogonal.

    Area of Science:

    • Optics and Photonics
    • Nonlinear Optics
    • Fiber Optics

    Background:

    • Polarization scrambling is crucial for optical communication systems to mitigate polarization-dependent losses.
    • Existing polarization scrambling techniques often require active feedback or complex setups.
    • All-optical methods offer potential for simpler and faster polarization control.

    Purpose of the Study:

    • To propose and analyze a novel all-optical fiber polarization scrambler.
    • To investigate the transfer of intensity fluctuations to polarization fluctuations via the Kerr effect.
    • To determine optimal conditions for efficient polarization scrambling.

    Main Methods:

    • Utilizing the Kerr effect in a randomly birefringent telecom fiber.
    • Copropagating an incoherent pump beam and a frequency-shifted signal beam.

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  • Analyzing the influence of input polarization states on scrambling efficiency.

    • Main Results:

    • Demonstrated a novel all-optical fiber polarization scrambler.
    • Showcased the transfer of pump beam intensity fluctuations to signal beam polarization fluctuations.
    • Identified that optimal scrambling is achieved when signal and pump polarizations are nearly orthogonal.
    • Confirmed the scrambler's functionality for both continuous-wave (cw) and high-bit-rate pulsed signals.

    Conclusions:

    • The proposed nonlinear polarization scrambler offers a simple and effective all-optical solution for polarization scrambling.
    • This method leverages the Kerr effect for efficient noise transfer and polarization manipulation.
    • The technology is applicable to various optical signal types, enhancing its practical utility in optical communications.