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Mitigating optical multipath interference in IM-DD systems via efficient joint notch coding and nonlinear

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    Optical multipath interference (MPI) in intensity-modulated/direct-detection (IM-DD) links is mitigated by a novel joint scheme. This approach combines transmitter notch coding and receiver nonlinear filtering for improved signal integrity.

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    Area of Science:

    • Optical communications
    • Signal processing

    Background:

    • Optical multipath interference (MPI) significantly degrades performance in intensity-modulated/direct-detection (IM-DD) systems.
    • MPI causes signal-dependent intensity fluctuations, especially with large-linewidth lasers and high-order Pulse Amplitude Modulation (PAM) formats.
    • In the frequency domain, MPI appears as low-frequency, narrowband noise.

    Purpose of the Study:

    • To propose and experimentally validate a low-complexity joint scheme for mitigating optical multipath interference in IM-DD systems.
    • To enhance the signal-to-interference ratio (SIR) tolerance in high-speed optical links.

    Main Methods:

    • A joint mitigation scheme combining minimum block digital sum (MBDS) notch coding at the transmitter.
    • Integration of a 2nd-order polynomial nonlinear filter (PNLF) equalizer at the receiver.
    • Experimental validation using 40 Gbaud and 56 Gbaud PAM-4 O-band IM-DD systems.

    Main Results:

    • The MBDS scheme creates a deeper and wider low-frequency notch with reduced overhead.
    • The PNLF equalizer effectively suppresses MPI-induced fluctuations with minimal computational cost.
    • Demonstrated SIR tolerance improvements of 3.25 dB at 40 Gbaud and 5.23 dB at 56 Gbaud.

    Conclusions:

    • The proposed joint MBDS and PNLF scheme offers a highly effective and low-complexity solution for MPI mitigation in IM-DD systems.
    • This approach significantly outperforms existing methods, enabling more robust optical communication links.