A 40Gb/s 8mW-OMA 1-to-N VCSEL Driver for Parallel and Wireless Optical Links Using 150nm GaN HEMT

📋 论文概要

本文提出一种基于150nm GaN HEMT的40Gb/s 1-to-N VCSEL驱动器，无需预驱动器即可驱动串联或并联的VCSEL阵列。通过共源主数据级和辅助可调偏置级，实现了8mW OMA和480mW功耗，支持40Gb/s NRZ和38Gb/s PAM-4，满足非地面网络对高光调制幅度的需求。

💡 主要创新点

• 提出无需预驱动器的1-to-N VCSEL驱动拓扑，支持串联或并联阵列配置。
• 采用共源主数据级与辅助可调偏置级结构，灵活适配不同VCSEL阵列。
• 在150nm GaN HEMT工艺上实现40Gb/s NRZ与38Gb/s PAM-4高速光互连。

🏷 关键词

📄 原文摘要

Abstract This paper presents a 40Gb/s 1-to-N VCSEL driver using 150nm GaN HEMT with fT/fMAX of 50GHz/154GHz. The proposed topology can drive VCSEL arrays in series or parallel without the need of pre-driver, using a common-source main data stage and auxiliary adjustable bias stage for different array configurations. Measured optical eye diagrams show 8mW OMA at 40Gb/s NRZ with 3-tap FFE for 4 VCSELs in series under a 15V supply. The driver consumes 480mW. For PAM-4 input, the driver can support 38Gb/s. Emerging non-terrestrial network (NTN) links demand high optical modulation amplitude (OMA) to sustain long-reach free-space channels. Conventional NTN links utilize largefootprint optical modulators with large-swing drivers to satisfy the OMA requirement, suffering from high power and area overhead [1-2]. On the other hand, VCSEL array-based optical link emerges as a promising candidate (top of Fig. 14.4.1). VCSEL has advantages

👥 作者与机构

Shuo Sarah Feng1, Fuzhan Chen1, Ruitao Matthew Ma1,2, Hongyu Bruce Bao1, Kangping Zhong3, Pak Tao Alan Lau3, Chik Patrick Yue1,2

Hong Kong University of Science and Technology, Hong Kong, China, 2High5 Semiconductor, Hong Kong, China, 3Hong Kong Polytechnic University, Hong Kong, China