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    A novel Stokes vector method accurately estimates differential group delay (DGD) in optical systems. This non-data-aided (NDA) technique achieves low error for long-haul transmissions, crucial for high-speed networks.

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    Area of Science:

    • Optical Communications
    • Signal Processing
    • Photonics

    Background:

    • Polarization-multiplexed coherent optical orthogonal frequency-division multiplexing (OFDM) systems are vital for high-speed data transmission.
    • Differential group delay (DGD) is a significant impairment in such systems, affecting signal quality.
    • Accurate DGD estimation is essential for effective signal compensation and maintaining system performance.

    Purpose of the Study:

    • To investigate a Stokes vector-based non-data-aided (NDA) DGD estimation scheme.
    • To evaluate the scheme's performance with flexible bandwidth requirements.
    • To validate the estimation accuracy in realistic long-haul transmission scenarios.

    Main Methods:

    • Utilizing a Stokes vector-based approach for DGD estimation.
    • Implementing a non-data-aided (NDA) algorithm, reducing reliance on training sequences.
    • Conducting experiments and simulations on 40-Gb/s polarization-multiplexed coherent optical OFDM systems.

    Main Results:

    • Demonstrated successful DGD estimation with flexible bandwidth.
    • Achieved an estimation error of less than 2.5 ps after 1000-km standard single-mode fiber transmission.
    • Validated the scheme's robustness in long-haul transmission experiments and simulations.

    Conclusions:

    • The proposed Stokes vector-based NDA DGD estimation scheme is effective for high-speed optical systems.
    • The method offers flexibility in bandwidth requirements and high accuracy for long-haul transmissions.
    • This technique contributes to improved performance and reliability in modern optical communication networks.