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Digital pre-equalization for performance improvement in coherent PON.

Zepeng Gong, Fan Shi, Qingyu He

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    Summary
    This summary is machine-generated.

    This study introduces a pre-equalization scheme for 200 Gb/s coherent passive optical networks (PONs). The technique enhances receiver sensitivity and power budget, crucial for next-generation optical access networks.

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    Area of Science:

    • Optical communication networks
    • Signal processing for optical networks

    Background:

    • High-speed optical access networks require reduced computational complexity at the optical network unit (ONU).
    • Coherent passive optical networks (PONs) face challenges in managing computational load at the ONU.

    Purpose of the Study:

    • To present a novel pre-equalization scheme for 200 Gb/s coherent PON.
    • To reduce computational complexity at the ONU side.
    • To improve receiver sensitivity and power budget.

    Main Methods:

    • Integration of digital pre-distortion (DPD) and pre-emphasis techniques.
    • Evaluation of three modulation formats: 50 Gbaud PM-QPSK, 50 Gbaud Alamouti-coded PM-16QAM, and 25 Gbaud PM-16QAM.
    • Utilizing intradyne or heterodyne detection schemes.
    • Comprehensive numerical simulations and experimental evaluations.

    Main Results:

    • Demonstrated significant improvements in receiver sensitivity and power budget for 200 Gb/s coherent PON.
    • Achieved power budget enhancements of 3 dB (PM-QPSK), 7 dB (Alamouti-coded PM-16QAM), and 2.1 dB (PM-16QAM) in the downlink with minimal digital filtering taps.
    • Validated the effectiveness of the pre-equalization scheme.

    Conclusions:

    • The proposed pre-equalization scheme effectively enhances performance in 200 Gb/s coherent PON.
    • The technique offers a viable solution for reducing computational complexity at the ONU.
    • This approach is promising for next-generation optical access networks.