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Probabilistic shaped trellis coded modulation with generalized frequency division multiplexing for data center

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    This study introduces a novel Probabilistic Shaping Trellis Coded Modulation (PS-TCM) for optical communication systems. PS-TCM enhances data rates and signal reliability, approaching the theoretical Shannon limit for improved performance.

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    Area of Science:

    • Optical Communications
    • Signal Processing

    Background:

    • Increasing demand for high-capacity communication systems.
    • Need to bridge the gap between achievable information rates and Shannon capacity limits.

    Purpose of the Study:

    • To present and experimentally validate a novel Probabilistic Shaping Trellis Coded Modulation (PS-TCM) scheme.
    • To improve spectral efficiency and reliability in optical communication systems.

    Main Methods:

    • Implementing PS-TCM combined with Generalized Frequency Division Multiplexing (GFDM).
    • Analyzing the principle of PS-TCM using mutual information.
    • Experimental demonstration in an optical GFDM system.

    Main Results:

    • A 4 Gb/s PS-TCM-32QAM signal showed a ~2 dB gain over 16QAM (back-to-back).
    • PS-TCM-32QAM achieved 1.8 dB gain over 16QAM after 20 km transmission.
    • Analysis of optical filter bandwidth effects on PS-TCM-32QAM performance.

    Conclusions:

    • The proposed PS-TCM scheme offers significant performance gains and flexible spectrum efficiency.
    • The scheme approaches the Shannon limit, providing a better trade-off for multi-carrier optical systems.
    • PS-TCM is a promising technology for future high-capacity optical networks.