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Quasi-light Storage for Optical Data Packets
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Coherent transceiver operating at 61-Gbaud/s.

Zhuhong Zhang, Chuandong Li, Jun Chen

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    |September 15, 2015
    PubMed
    Summary

    This study demonstrates real-time coherent transceiver operation at a record 61-Gbaud/s using novel digital signal processing (DSP) algorithms. This enables error-free transmission of 200-Gbit/s PDM-QPSK and 400-Gbit/s PDM-16QAM signals.

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    Area of Science:

    • Optical communication systems
    • Digital signal processing
    • High-speed electronics

    Background:

    • Limitations in electronic component bandwidth (e.g., DAC, ADC) restrict baud rates.
    • Narrow filtering effects pose challenges for data clock acquisition and modem performance.
    • Advancements in CMOS technology are crucial for high-speed transceiver development.

    Purpose of the Study:

    • To achieve real-time coherent transceiver operation at a record baud rate.
    • To mitigate narrow filtering effects using novel digital signal processing (DSP) algorithms.
    • To enable error-free transmission of high-capacity data signals.

    Main Methods:

    • Utilized 85-Gs/s DAC and ADC with optoelectronic components having <15GHz bandwidth.
    • Implemented novel DSP algorithms in CMOS for real-time processing.
    • Employed transmitter pre-emphasis, novel timing recovery, and soft-output MLSE.

    Main Results:

    • Achieved a record baud rate of 61-Gbaud/s.
    • Demonstrated error-free transmission of 200-Gbit/s PDM-QPSK at 15.2dB OSNR.
    • Achieved error-free transmission of 400-Gbit/s PDM-16QAM at 30.2dB OSNR.
    • Successful transmission over 1200km for PDM-QPSK and 80km for PDM-16QAM.

    Conclusions:

    • Novel DSP algorithms are critical for overcoming electronic bandwidth limitations.
    • The developed system enables high-speed, high-capacity optical data transmission.
    • This work pushes the boundaries of real-time coherent transceiver performance.