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    Area of Science:

    • Optical Communications
    • Signal Processing

    Background:

    • Directly modulated lasers (DMLs) in orthogonal frequency division multiplexing (OFDM) systems face nonlinear distortion from laser chirp and fiber dispersion.
    • This distortion degrades transmission performance and limits system reach.

    Purpose of the Study:

    • To propose a non-orthogonal Discrete Fourier Transform (DFT) matrix precoding scheme to mitigate nonlinear distortion in DML-based OFDM systems.
    • To reduce peak-to-average power ratio (PAPR) and nonlinear distortion without compromising spectral efficiency (SE).

    Main Methods:

    • A non-orthogonal DFT matrix precoding scheme is employed.
    • The cascaded binary-phase-shift-keying iterative detection (CBID) algorithm is utilized to manage induced inter-carrier interference (ICI).

    Main Results:

    • The proposed scheme experimentally achieved approximately 0.4-dB sensitivity improvement at the KP4-forward error correction (FEC) threshold.
    • It outperformed the third-order Volterra nonlinear equalizer (VNLE).

    Conclusions:

    • The non-orthogonal DFT precoding scheme effectively mitigates nonlinear distortion in DML-OFDM systems.
    • Significant reductions in computational complexity (90% multiplication, 88.32% addition) were achieved compared to VNLE.