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    • A 4×32-Gb/s VCSEL Driver with Adaptive Feedforward Equalization in 65-Nm CMOS

    Toshiyuki Inoue,Akira Tsuchiya,Keiji Kishine,Daisuke Ito,Yasuhiro Takahashi,Makoto Nakamura

    2023 30th IEEE International Conference on Electronics, Circuits and Systems (ICECS)（2023）

    The University of Shiga Prefecture 2500 Hassaka Hikone | Gifu University 1-1 Yanagido

    Cited 0|Views8
    Abstract
    In this paper, we present a multichannel vertical-cavity surface-emitting laser (VCSEL) driver for co-packaged optics (CPO) with an adaptive feedforward equalization (FFE) to improve the frequency bandwidth using a simple configuration. The proposed VCSEL driver is designed in a 65-nm CMOS process. The post-layout simulation results show that the modulating operation of the 1060-nm band VCSEL is obtained at 32 Gb/s. The fabricated VCSEL driver is tested by on-wafer probing, and the clear eye opening of the electrical output is observed. All 4 channels operate at 32 Gb/s, and the strength of the FFE can be digitally controlled. Additionally, an energy efficiency (EPB) of 1.56 pJ/b/ch is obtained. The measurement results reveal that our VCSEL driver is suitable for CPO modules from the metrics of the bit rate, EPB, and the occupied chip area.
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    Key words
    co-packaged optics,optical interconnection,optical fiber communication,VCSEL driver,feedforward equalization
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    【要点】：本文提出了一种采用自适应前馈均衡技术（FFE）的4×32-Gb/s VCSEL驱动器，以简单配置提升频率带宽，实现了高数据传输率和低能耗，适用于共封装光学（CPO）模块。
    

    【方法】：设计了一种在65-nm CMOS工艺下的多通道垂直腔面发射激光器（VCSEL）驱动器，并集成了自适应前馈均衡技术以优化性能。
    

    【实验】：通过后布局仿真和芯片级测试，验证了驱动器在32 Gb/s下1060-nm波段VCSEL的调制操作，并观察到电输出的清晰眼图。实验使用了on-wafer probing技术，测试了所有4通道在32 Gb/s下的性能，并实现了数字可控的FFE强度，获得了1.56 pJ/b/ch的能量效率（EPB），证明了驱动器在比特率、EPB和占用芯片面积等指标上的适用性。