A Hybrid Beam Steering Free-Space and Fiber Based Optical Data Center Network
A Hybrid Beam Steering Free-Space and Fiber Based Optical Data Center Network
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DOI：
10.1109/jlt.2023.3254160
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发表时间：
2023-08
影响因子：
4.7
通讯作者：
Yanwu Liu;Joshua L. Benjamin;Christopher W. F. Parsonson;G. Zervas
中科院分区：
文献类型：
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作者：
Yanwu Liu;Joshua L. Benjamin;Christopher W. F. Parsonson;G. Zervas
无线数据中心网络（dcn）是一种很有前途的解决方案，可以减轻传统有线dcn的布线复杂性，并在自由空间中以更快的传播速度降低端到端延迟。然而，在密集部署中，必须仔细设计无线dcn中的物理架构，以考虑无线链路阻塞、障碍物绕过、路径损耗、干扰和空间效率。在保证全光、单跳、非超订阅和全等分带宽的情况下，提出了FSO/in-光纤混合DCN的物理层设计。我们提出了两种布局，并分析了它们的可扩展性：(1)静态网络仅利用可调源，可扩展到43个机架，15,609个节点和15,609个通道；(2)具有可调谐源和基于压电致动器（PZT）的波束导向的可重构网络，该网络可以在毫秒PZT切换时间内扩展到8个机架，2,904个节点和185,856个通道。基于流量生成框架和动态波长时隙调度算法，仿真了363节点子网的系统级网络性能，达到$>\!\！99%的吞吐量和1.23美元的平均调度程序延迟在90%的负载。
Wireless data center networks (DCNs) are promising solutions to mitigate the cabling complexity in traditional wired DCNs and potentially reduce the end-to-end latency with faster propagation speed in free space. Yet, physical architectures in wireless DCNs must be carefully designed regarding wireless link blockage, obstacle bypassing, path loss, interference and spatial efficiency in a dense deployment. This paper presents the physical layer design of a hybrid FSO/in-fiber DCN while guaranteeing an all-optical, single hop, non-oversubscribed and full-bisection bandwidth network. We propose two layouts and analyze their scalability: (1) A static network utilizing only tunable sources which can scale up to 43 racks, 15,609 nodes and 15,609 channels; and (2) a re-configurable network with both tunable sources and piezoelectric actuator (PZT) based beam-steering which can scale up to 8 racks, 2,904 nodes and 185,856 channels at millisecond PZT switching time. Based on a traffic generation framework and a dynamic wavelength-timeslot scheduling algorithm, the system-level network performance is simulated for a 363-node subnet, reaching $>\!\!99\%$ throughput and 1.23 $\mu$s average scheduler latency at 90% load.