光通信研究Issue(5)：83-91,9.DOI:10.13756/j.gtxyj.2024.240030
面向数据中心的超高速光模块板级信号完整性研究
Board Level Signal Integrity Study of Ultra-High-Speed Optical Module for Data Centers
摘要
Abstract
[Objective]The rapid development of artificial intelligence has put forward higher requirements for data center com-puting.As the core device of the data center optical interconnection,the design of optical module will also encounter big chal-lenges.With the increasing speed of optical modules,the signal integrity problem has become a bottleneck that restricts the performance of optical modules.In order to design a high-speed optical module that can meet the speed requirements of optical interconnects in data centers,especially high performance computing application,it is necessary to implement optimal design on the ultra-high-speed link inside the optical module.[Methods]In this paper,the factors affecting the integrity of the signal in the optical module are simulated and optimized with a Quad Small Form-factor Pluggable Double Density(QSFP-DD)optical module as an example.The specific work is to theoretically analyze the parts of the channel that may deteriorate the signal in-tegrity,such as vias and Ball Grid Array(BGA)solder balls,and discuss the optimization and improvement methods of these parts.In particular,this paper analyzes the optimization method for signal transmission in the frequency band above 50 GHz,so that the high-speed channel can realize the low-loss transmission for ultra-high-speed 4-Level Pulse Amplitude Modulation(PAM4)signal.In addition,the transmission performance of the whole high-speed channel is also studied and tested by the four-port vector network analyzer.[Results]The results show that the design scheme can achieve the required transmission bandwidth without resonance.The simulation results of full channel show that the return loss of all channels is less than-15 dB and the insertion loss is less than 3 dB,and 224 Gbit/s PAM4 signal low-loss transmission can be achieved.The test results are basically consistent with the simulation results,which proves that the design scheme can meet the requirement of high speed optical interconnects in Datacenters.[Conclusion]The method of signal integrity design of optical modules proposed in this paper has important guiding significance for the design of ultra-high-speed optical modules in the future,and will also pro-vide a reference for the design of other kinds of high-speed circuits.关键词
数据中心光互连/高速电路/信号完整性/双密度4通道小型可插拔光模块/电磁仿真Key words
data center optical interconnects/high speed circuit/signal integrity/QSFP-DD optical module/electromagnetic simulation分类
信息技术与安全科学引用本文复制引用
钟光诚,雷从彪,姜宇轩,谢亮..面向数据中心的超高速光模块板级信号完整性研究[J].光通信研究,2024,(5):83-91,9.基金项目
国家重点研发计划资助项目(2021YFB2206500) （2021YFB2206500）
