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Pairwise Tomlinson-Harashima precoding for multiple-lane IM-DD transmissions.

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    A new pairwise Tomlinson-Harshima precoding (P-THP) scheme effectively tackles inter-symbol interference and performance variations in multi-lane intensity modulation direct detection (IM-DD) systems. This method enhances throughput for high-speed optical communication by reducing required optical received power.

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    Area of Science:

    • Optical communication systems
    • Signal processing for optical networks

    Background:

    • Photonic interconnections using multiple-lane intensity modulation direct detection (IM-DD) face throughput limitations.
    • Intra-channel inter-symbol interference (ISI) due to bandwidth constraints and inter-channel performance discrepancies from component variations are key challenges.

    Purpose of the Study:

    • To propose and experimentally evaluate a pairwise Tomlinson-Harshima precoding (P-THP) scheme.
    • To simultaneously address intra-channel ISI and inter-channel performance discrepancies in IM-DD systems.

    Main Methods:

    • Implementation of a novel pairwise Tomlinson-Harshima precoding (P-THP) scheme.
    • Experimental transmission of 4-channel 81-GBaud PAM4 signals over 2 km of standard single-mode fiber (SSMF).
    • Comparison with conventional Tomlinson-Harshima precoding applied to individual channels.

    Main Results:

    • The proposed P-THP scheme reduced required optical received power (ROP) by 0.75–1 dB under back-to-back (B2B) conditions compared to conventional methods.
    • At the 7% hard decision forward error correction (HD-FEC) threshold (BER = 3.8 × 10-3), P-THP demonstrated superior performance.
    • After 2 km SSMF transmission, only the P-THP scheme enabled reaching the HD-FEC threshold, achieving a net rate exceeding 600 Gbit/s.

    Conclusions:

    • The pairwise Tomlinson-Harshima precoding (P-THP) scheme is an effective solution for mitigating ISI and performance variations in multi-lane IM-DD optical interconnections.
    • P-THP significantly improves the performance and enables higher net data rates for high-speed optical communication systems.