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Updated: Jul 11, 2026

Quasi-light Storage for Optical Data Packets
07:45

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Published on: February 6, 2014

Low-complexity symbol-rate equalization schemes for short-reach coherent-lite optical interconnects.

Baoxuan Quan, Fei Xie, Hao Zhou

    Optics Express
    |February 20, 2026
    PubMed
    Summary

    Two new dynamic pruning MIMO (DP-MIMO) and dynamic clustering MIMO (DC-MIMO) schemes significantly reduce computational complexity in optical interconnects. These methods adapt to real-time channel conditions, offering substantial reductions in real-valued multiplications with minimal performance impact.

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    Area of Science:

    • Optical communications engineering
    • Signal processing

    Background:

    • Short-reach optical interconnects are crucial for data centers.
    • High computational complexity in traditional MIMO equalization limits performance.
    • Coherent-lite systems require efficient equalization techniques.

    Purpose of the Study:

    • To propose low-complexity MIMO equalization schemes for short-reach optical interconnects.
    • To reduce computational complexity in real-valued (RV) MIMO architectures.
    • To evaluate the performance and robustness of proposed dynamic schemes.

    Main Methods:

    • Dynamic Pruning MIMO (DP-MIMO): Sparsifies filter coefficients, adjusting sparsity based on channel energy.
    • Dynamic Clustering MIMO (DC-MIMO): Clusters filter coefficients with an energy-adaptive mechanism.
    • Experimental validation in an 80-GBaud DP-16QAM system over 1-5 km SSMF links.

    Main Results:

    • DP-MIMO achieved ~40% reduction in real-valued multiplications (RMs) with a 0.20-dB ROP penalty.
    • DC-MIMO achieved ~60% RMs reduction with a 0.15-dB ROP penalty.
    • Both schemes demonstrated robustness against 2-ps IQ skew impairments.

    Conclusions:

    • DP-MIMO and DC-MIMO offer significant complexity reduction for coherent-lite optical interconnects.
    • Dynamic adaptation to channel characteristics balances complexity and performance effectively.
    • The proposed schemes are suitable for high-speed optical systems facing impairments like IQ skew.