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Improved polarization dependent loss tolerance for polarization multiplexed coherent optical systems by polarization

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    Pairwise Coding effectively mitigates polarization-dependent loss (PDL) in coherent optical systems. This technique improves optical signal-to-noise ratio (OSNR) without adding coding overhead, enhancing next-generation transmission systems.

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    Area of Science:

    • Optical Communications
    • Signal Processing

    Background:

    • Polarization-dependent loss (PDL) significantly degrades performance in polarization-division-multiplexed (PDM) coherent optical systems.
    • Imbalanced optical signal-to-noise ratio (OSNR) between polarizations is a major bottleneck.

    Purpose of the Study:

    • To investigate Pairwise Coding for adaptive PDL mitigation in PDM coherent optical systems.
    • To introduce a novel coding scheme that enhances OSNR without overhead.

    Main Methods:

    • Developed and detailed the coding and de-coding design for Polarization Pairwise Coding.
    • Derived analytical symbol/bit error rate for performance prediction and optimization.
    • Conducted simulations to evaluate performance gains across various PDL values.

    Main Results:

    • Pairwise Coding significantly mitigates PDL-induced performance degradation.
    • Achieved substantial system performance gains over a wide range of PDL values.
    • Demonstrated superior performance compared to Walsh-Hadamard transform and computational simplicity over Golden/Silver Codes.

    Conclusions:

    • Pairwise Coding is a practical and effective solution for PDL mitigation in current and future high-speed coherent optical transceivers.
    • The scheme offers improved OSNR and system performance without coding overhead.
    • Its computational efficiency makes it suitable for 100-Gb/s, 400-Gb/s, and 1-Tb/s systems.