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    This study introduces a low-complexity electrical dispersion pre-compensation (pre-EDC) scheme using cluster-assisting look-up tables (CLUTs) for intensity modulation direct detection (IM-DD) systems. The novel method significantly reduces computational complexity, enabling higher capacity-distance products.

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    Area of Science:

    • Optical communications
    • Signal processing

    Background:

    • Chromatic dispersion (CD) and direct detection limit capacity-distance in intensity modulation direct detection (IM-DD) systems.
    • Gerchberg-Saxton (GS) based electrical dispersion pre-compensation (pre-EDC) improves robustness but suffers from high computational complexity.

    Purpose of the Study:

    • To propose a novel, low-complexity pre-EDC scheme for IM-DD systems.
    • To reduce the computational complexity of existing non-iterative FIR-based pre-EDC schemes.

    Main Methods:

    • A cluster-assisting look-up table (CLUT) technique replaces convolution with table look-up and accumulation.
    • Tap weights are clustered to establish LUTs for each cluster center, balancing LUT number and size.
    • Experimental demonstration with 80 Gbit/s PAM-4 and 100 Gbit/s PAM-6 signals over 20 km standard single-mode fiber (SSMF).

    Main Results:

    • Eliminates multiplication operations in convolution.
    • Reduces addition times by 58.54% for PAM-4 and 51.22% for PAM-6 signals.
    • Achieves performance at the 7% HD-FEC threshold without any penalty.

    Conclusions:

    • The proposed CLUT-based pre-EDC scheme offers a practical solution for enhancing IM-DD system performance.
    • Significant reduction in computational complexity enables higher data rates and longer transmission distances.
    • The method effectively mitigates chromatic dispersion impacts without performance degradation.