基于DWDM的超100 Gbit/s混合组网分析

Analysis of DWDM-based Beyond 100 Gbit/s Hybrid Networking

【目的】近年来,数据通信量呈爆炸性增长,为了应对高速、高容量数据传输及网络应用场景多样化的需求,超100 Gbit/s密集波分复用(DWDM)混合组网作为一种高效的解决方案逐渐受到关注。文章通过对超100 Gbit/s DWDM混合组网的需求、关键技术及实际案例进行分析,为构建高容量、高效率的通信网络提供了技术支持和指导。【方法】文章首先阐述了网络发展在容量扩展和支持复杂网络设计方面的需求,其次重点介绍了超100 Gbit/s混合组网的关键技术,包括星座图整形、频谱整形和灵活栅格技术等。其中,为支撑混合组网的业务速率设计,提供了一种用于级联掺铒光纤放大器(EDFA)通信系统的光信噪比(OSNR)计算方法,仅利用信道配置信息、发端信号光功率、EDFA的增益及噪声等相关参数,即可计算出整个链路中各个波长的输出OSNR。最后,结合海外某网络案例,根据实际链路OSNR评估情况,合理进行混合速率网络设计,论证了超100 Gbit/s DWDM混合组网在实际工程中的应用效果。【结果】通过应用超100 Gbit/s DWDM混合组网,根据OSNR评估情况灵活配置传输速率和传输带宽,实现了200、600和800 Gbit/s混合速率网络部署,既满足了核心站点的大容量需求,也兼顾了边缘站点的长途大跨度需求,并在3年期间实现了网络的平滑升级和扩容。【结论】实践证明,超100 Gbit/s DWDM组网能够有效提升网络容量、灵活性及频谱资源利用率,同时也为网络的持续演进提供了空间,是推进大容量光传输网络发展的重要手段。

【Objective】In recent years,there has been an explosive growth in data communication traffic.To address the demands for high-speed,high-capacity data transmission and the diversification of network application scenarios,100 Gbit/s and Beyond(B100 Gbit/s)Dense Wavelength Division Multiplexing(DWDM)hybrid networking has gradually gained attention as an efficient solution.This paper conducts an analysis of the requirements,key technologies,and practical case studies of B100 Gbit/s DWDM hybrid networking to provide technical support and guidance for constructing high-capacity and efficient communication networks.【Methods】This paper first elucidates the requirements for the development of B100 Gbit/s DWDM hybrid networks,including the need for network capacity expansion and support for complex network architectures.Next,it focuses on introducing the key technologies of B100 Gbit/s DWDM hybrid networking,including constellation shaping,spectrum shaping,and flexible grid techniques.To support bitrate design in hybrid networking,a method for Optical Signal-to-Noise Ratio(OSNR)calculation in cascaded Erbium-Doped Fiber Amplifier(EDFA)communication systems is presented,utilizing parameters such as channel configuration information,signal optical power after transmitter,gain and noise parameters of EDFAs,to progressively calculate the output OSNR for each wavelength along the entire link.Finally,in conjunction with a foreign network case study and based on actual OSNR evaluation findings,a rational hybrid rate network design is performed,demonstrating the practical application of B100 Gbit/s DWDM hybrid networking in engineering projects.【Results】By employing B100 Gbit/s DWDM hybrid network,after flexibly configuring transmission rates and bandwidths according to OSNR evaluations,the deployment of hybrid rate networks at 200,600 and 800 Gbit/s is achieved.This approach fulfills the high-capacity requirements of core sites while accommodating the long-distance,extensive span requirements of edge sites.Furthermore,network upgrades and expansion were smoothly accomplished within a three-year period.【Conclusion】Empirical evidence demonstrates that B100 Gbit/s DWDM networking effectively enhances network capacity,flexibility,and spectrum resource utilization.Moreover,it provides room for the continuous evolution of the networks,serving as a vital methods to advance the development of high-capacity optical transmission networks.