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    We minimized signal power differences in ultralong Raman laser-amplified WDM systems. Optimization of fiber span and operating band reduces asymmetry for improved optical conjugation and nonlinear impairment mitigation.

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    Area of Science:

    • Optical Communications
    • Fiber Optics
    • Nonlinear Optics

    Background:

    • Ultralong Raman laser-amplified WDM systems are crucial for high-capacity data transmission.
    • In-span signal power asymmetry can degrade system performance, especially in systems using mid-link optical conjugation.
    • Mid-link optical conjugation is employed to mitigate fiber nonlinear impairments.

    Purpose of the Study:

    • To characterize in-span signal power asymmetry in specific WDM systems.
    • To numerically optimize fiber span length and operating band to minimize this asymmetry.
    • To enhance the effectiveness of mid-link optical conjugation for nonlinear impairment mitigation.

    Main Methods:

    • Numerical simulations were used to model the WDM transmission system.
    • In-span signal power asymmetry was characterized under various conditions.
    • Fiber span length and operating band were systematically varied to find optimal parameters.

    Main Results:

    • The study successfully identified optimal fiber span lengths and operating bands.
    • Achieved significantly reduced inter-span signal power asymmetry between transmitted and conjugated channels.
    • Demonstrated the effectiveness of optimization in improving system performance.

    Conclusions:

    • Optimizing fiber span length and operating band is critical for managing signal power asymmetry.
    • Reduced asymmetry enhances the performance of mid-link optical conjugation in combating nonlinear effects.
    • This research provides a pathway for more robust and efficient ultralong WDM systems.