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System performance enhancement with pre-distorted OOFDM signal waveforms in DM/DD systems.

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    Area of Science:

    • Optical communications
    • Signal processing
    • Nonlinear optics

    Background:

    • Directly modulated/detected optical orthogonal frequency-division multiplexing (OOFDM) systems suffer from nonlinear distortion.
    • This distortion limits achievable transmission rates and link distances.
    • Mitigating nonlinear distortion is crucial for enhancing optical network performance.

    Purpose of the Study:

    • To propose and evaluate a pre-distortion technique for mitigating nonlinear distortion in OOFDM systems.
    • To analyze the system performance under various operating conditions.
    • To compare the proposed method with existing nonlinear equalization techniques.

    Main Methods:

    • Development of a novel pre-distortion algorithm tailored for OOFDM systems.
    • System performance evaluation through simulations.
    • Analysis of transmission rates and error performance over different fiber link lengths (40 km and 100 km).

    Main Results:

    • The proposed pre-distortion technique effectively reduces nonlinear distortion.
    • Achieved transmission rates of approximately 40 Gbits/s over 40 km and 18.5 Gbits/s over 100 km of single-mode fiber.
    • Demonstrated potential for superior performance compared to receiver-based nonlinear equalization.

    Conclusions:

    • The proposed pre-distortion method is an efficient solution for mitigating nonlinear distortion in OOFDM systems.
    • This technique enables higher data transmission rates over extended fiber optic links.
    • Pre-distortion offers a promising approach for improving the overall performance of optical communication systems.