信道线性及非线性失真会降低基于四电平脉冲幅度调制（PAM4）的短距离光互联系统的性能，利用PAM4发射芯片对信号进行预补偿能缓解信道失真带来的影响。因此，研究了一种适用于短距离光互联的PAM4发射芯片架构。该架构基于查找表（LUT）均衡器和源串联终端数模转换器灵活补偿光信道失真，利用流水线结构的选择器进行高速LUT读取；同时，采用电阻反馈的预驱动电路减少高速数模转换器信号输出时的码间干扰。后仿真结果表明，55 nm工艺制程PAM4发射芯片的速率可达到40 Gbit/s，能实现灵活配置的均衡模式，满足下一代数据中心、接入等光互联网络的需求。

Linear and nonlinear channel distortion could degrade the performance of short reach optical interconnection system based on four-level pulse amplitude modulation (PAM4). Using PAM4 transmitter integrated circuits to pre-compensate the signal can alleviate the impact of channel distortion. This paper studies the architecture of PAM4 transmitter chip suitable for short reach optical interconnection. The architecture is based on look-up table (LUT) equalizer and source series terminated digital-to-analog converter, which can flexibly compensate the optical channel distortion. The pipelined multiplexer is used for high speed LUT reading. Digital-to-analog converter pre-driver circuit with feedback resistance is used to decrease the inter-symbol-interference. The post simulation results show that the PAM4 transmitter integrated circuits based on 55 nm process is able to reach 40 Gbit/s. It also enables reconfigurability of various types of equalizers and meets the requirements of next generation data center, access and other optical interconnection networks.