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Real-time fast polarization tracking based on polarization phase locking least mean square algorithm.

Jie Li, Tao Zeng, Xiang Li

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    |September 13, 2019
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    Summary
    This summary is machine-generated.

    This study introduces a fast polarization tracking method using a phase locking least mean square (LMS) algorithm. It achieves significant improvements in tracking speed for optical communication systems.

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    Area of Science:

    • Optical Communications
    • Digital Signal Processing

    Background:

    • Polarization fluctuations in optical fibers cause signal degradation.
    • Accurate polarization tracking is crucial for coherent optical systems.

    Purpose of the Study:

    • To propose and demonstrate a fast polarization tracking scheme.
    • To improve tracking speed and performance over conventional methods.

    Main Methods:

    • Developed a polarization tracking scheme using a phase locking least mean square (LMS) algorithm.
    • Implemented a quasi-feed-forward digital signal processing (DSP) architecture.
    • Verified performance through simulations and real-time experiments.

    Main Results:

    • The proposed algorithm tracks state of polarization (SOP) variations up to 12 Mrad/s (100-Gb/s QPSK) and 3.3 Mrad/s (400-Gb/s 16QAM) in simulations.
    • Achieved 2.5 Mrad/s tracking in a 10-Gb/s QPSK real-time experiment.
    • Demonstrated no frequency/phase offset feedback requirement from carrier recovery.

    Conclusions:

    • The proposed fast polarization tracking scheme offers superior performance compared to conventional LMS algorithms.
    • The method is effective for high-speed coherent optical transmission systems.
    • Enables robust real-time polarization tracking in dynamic optical networks.