用于光突发交换的光模块(特邀)
Optical Modules for Optical Burst Switching
黄水清1
作者信息
- 1. 默升科技(上海)有限公司,上海 201315
- 折叠
摘要
[目的]为满足人工智能(AI)集群网络对于资源分配的灵活性和资源利用率的高要求,光突发交换(OBS)重回人们的视野.这对光模块提出了更高的要求:首先,纳秒级光路切换速度要求高速光模块的接收侧适应突发模式;其次,目前达到纳秒级的高速光开关普遍存在光路插入损耗大的问题,所以要求高速光模块的光链路损耗达到超长(ER)距离标准.[方法]为满足此需求,文章采用全商用芯片搭建薄膜铌酸锂(TFLN)+光电探测器(PD)方案的 ER光模块,设计了测试系统,下一步工作还在进行中.[结果]实验结果表明,此系统光链路预算达到了 20 dB,基本满足高速光交换对光模块链路损耗的要求.OBS系统对各种颗粒大小光模块均可以接受,文章初步探讨了 3 类单波 100 Gbit/s光模块的设计:因为存在整机功耗和体积的限制、四波混频(FWM)和多路小光敏面雪崩光电探测器(APD)导致耦合困难等问题,4 路光的 ER 光模块(ER4)实现起来比 8路光的 ER光模块(ER8)容易很多.两路光的 ER2 模块可以采用同轴工艺电吸收调制激光器(TO-EML)+APD方案,工艺实现更容易,性价比更高,配套芯片更加成熟.[结论]所以 200 Gbit/s ER2 是目前 OBS的优选品种.
Abstract
[Objective]To meet the requirements of Artificial Intelligence(AI)cluster networks for flexibility in resource alloca-tion and resource utilization,Optical Burst Switching(OBS)has returned to people's view.More items may be required to the optical module:firstly,a nanosecond optical path switching speed is required,and the receiver of the high-speed optical module is required to adapt to burst mode.Secondly,currently high-speed optical switches that reach the nanosecond level usually have the problem of high optical path insertion loss.Therefore,the link loss of high-speed optical modules is required to meet the Extended-Reach(ER)distance standard.[Methods]To meet this requirement,the article presents the assembly of an ER opti-cal module using a fully commercial chip with a Thin Film Lithium Niobate(TFLN)and PhotoDetector(PD)solution.A tes-ting system has been designed for this module,and the subsequent steps of the work are still in progress.[Results]The experi-mental results show that an optical link budget of 20 dB is obtained,basically meeting the requirements of high-speed optical switching for optical module link budget.The OBS system is acceptable for optical modules with various particle size.We have preliminarily explored the design of three types of 100 Gbit/s lane optical modules:due to limitations in overall power con-sumption and volume,four wave mixing,and difficulties in coupling with multiple Avalanche PhotoDetectors(APD),the im-plementation of 4-way ER4 optical modules is much easier than 8-way ER8 modules.The ER2 module with two optical chan-nels can adopt the coaxial process Electro-absorption Modulation Laser(TO-EML)+small aperture APD scheme,which has the advantages of easy implementation,high cost-effectiveness,and mature supporting chips.[Conclusion]Therefore,200 Gbit/s ER2 is the optimized choice for OBS systems.
关键词
全光网络/以太网交换机/突发模式光模块/光突发交换Key words
all optical network/Ethernet switch/burst mode optical module/OBS引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据