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Multiplication-free error corrector for partial response equalization in 256-Gb/s PAM4 IM/DD systems.

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    A new multiplication-free error corrector (MF-EC) tackles error propagation in partial response equalization (PRE) for high-speed optical systems. This technique significantly reduces burst errors, improving data transmission reliability.

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    Area of Science:

    • Optical communication systems
    • Signal processing
    • Digital communications

    Background:

    • High-speed intensity modulation and direct detection (IM/DD) systems face inter-symbol interference (ISI) due to bandwidth limitations.
    • Partial response equalization (PRE) enhances robustness but its common 1/(1+D) decoder can cause error propagation, degrading performance.

    Purpose of the Study:

    • To propose a novel multiplication-free error corrector (MF-EC) designed to suppress error propagation in second-order PRE systems.
    • To experimentally validate the effectiveness of the MF-EC in high-speed optical communication.

    Main Methods:

    • Development of a multiplication-free error corrector (MF-EC) utilizing only additive operations to locate and correct burst errors.
    • Experimental demonstration of the MF-EC in a 256-Gb/s 4-ary pulse amplitude modulation (PAM-4) IM/DD system.

    Main Results:

    • The MF-EC effectively eliminates error propagation from the 1/(1+D) decoder, reducing maximum burst error length from 15 to seven symbols.
    • The proposed MF-EC demonstrates superior performance compared to precoding and error-correlation based DFE (EC-DEF).
    • In a 500-m transmission scenario, MF-EC achieves performance comparable to PRE-MLSE at the KP4-FEC threshold with reduced complexity.

    Conclusions:

    • The multiplication-free error corrector is a viable solution for mitigating error propagation in PRE systems.
    • MF-EC offers a promising approach for improving the reliability and efficiency of high-speed optical communication systems.
    • The proposed method presents a complexity-efficient alternative to existing techniques for advanced optical transceivers.