JSSC 2022第3期RF & Wireless40nm CMOS + 180nm SiPhPAM-4

A 50-Gbs PAM-4 Silicon-Photonic Transmitter Incorporating Lumped-Segment MZM Dis

一款50Gb/s PAM-4硅光发射器，采用集总段MZM设计，实现高带宽和线性调制。

50Gb/s, 9.8dB ER, 0.99 level mismatch ratio, 1.39pJ/bit/dB FoM, 682mW power

硅光子PAM-4调制马赫-曾德尔调制器光发射器高速互连

▸采用集总段马赫-曾德尔调制器(LS-MZM)实现高带宽PAM-4调制

▸多段驱动与调制器协同设计，无需高功耗线性驱动器

▸采用段内复用和时钟相位插值技术提高信号完整性

Abstract

This article presents a 50-Gb/s optical transmit- ter (TX), consisting of a 40-nm distributed CMOS driver and a 180-nm silicon-photonic modulator. A lumped-segment Mach–Zehnder modulator (LS-MZM) is developed for high bandwidth (BW) four-level pulse amplitude (PAM-4) modulation. A multi-segment driver with limiting outputs is co-designed, which is distributed into each LS-MZM segment. By grouping these LS-MSM segments in a thermometer code, high-linearity modulation is realized without the need