As optical networks expand towards the edge, the demands on infrastructure grow increasingly diverse and complex. Understanding the unique challenges of optical line systems in Metro/Edge/Access Networks, how they differ from traditional core networks, and the innovations required to meet these evolving needs is essential for developing scalable and efficient solutions.
The challenge is to expand optical networking to support edge to edge and edge to core connectivity without the use of optical to electrical regeneration while simultaneously expanding bandwidth and geographical equipment placement. The key is to increase network flexibility and bandwidth with a nonlinear cost and complexity model.
理解城域网/边缘网/接入网
从核心到边缘的网络旅程展现出鲜明对比。核心网络采用集中式架构，节点数量较少且电路拓扑结构更为简单，而城域/边缘/接入网络则具有以下特征：
高节点密度：边缘 网络中，每个核心节点可连接多达50-100个节点。
碎片化电路：与核心网络中的端到端电路不同，边缘网络呈现高度碎片化的端到端路径。
Cost and Size Sensitivity: With increased deployment at scale, compact and cost-effective solutions are crucial.
操作简易性：边缘网络必须提供与核心网络相同的功能，但需借助规模更大、类型更丰富的劳动力实现更快速的部署。具备嵌入式测试能力的简易性已成为必然要求。
这些特性要求重新构想解决方案，因为为核心网络设计的技术无法无缝适应边缘环境。
地铁边缘网络的关键挑战
地铁边缘网络需要独特的架构和技术框架来应对其独特的挑战：
1. Compact and Integrated Solutions:
- The edge environment demands smaller, power-efficient components. Disaggregation must coexist with reaggregation of layer 0 and layer 1 to optimize for cost and space.
- 折叠光学功能与集成架构有助于降低复杂度、缩小尺寸并减少功耗。
2. 频谱灵活性与效率：
- 频谱能力无缝转换，具备6.25 GHz分辨率，从边缘到核心网络连续覆盖。
- Support for IP-over-DWDM, alien wavelengths and bulk spectrum services to better utilize CapEx investments and improve network ROI via resource sharing.
3. 开放且互操作的系统：
- Interconnectivity at Layer 0 and Layer 1 must be ensured to integrate diverse vendor solutions and leverage emerging technologies faster.
- 互操作性增强了可扩展性，并减少了对专有技术的依赖。
4. 嵌入式测试与诊断：
- 由于边缘部署覆盖广阔的地理区域，嵌入式测试和测量能力对于实现无缝运行至关重要。
- 独立测试设备已不再可行；诊断功能必须融入每个节点和每个光纤节点。
地铁边缘的创新技术
To address these challenges, cutting-edge technologies are redefining the optical landscape:
资源池化
- 基于WSS的光学开关、放大与诊断功能可分布于多个模块，从而消除冗余。
- Pump-sharing architectures, like the high-efficiency laser pump farms offered by Coherent, optimize performance across fiber spans and degrees.
先进架构：
嵌入式智能：
High-speed, multi-access test and measurement capabilities enhance real-time network visibility. Embedded OTDR and OSA solutions from Coherent provide granular performance insights, enabling proactive maintenance and reducing downtime.
开创性的城域边缘技术
Here’s how cutting-edge innovations are shaping the edge network landscape:
纵向整合
- Miniaturized pumps and amplifiers enhance efficiency while reducing power and space requirements.
- Integrated passive components streamline manufacturing and deployment.
创建优化的Optica资源池以增强垂直整合
- 将基于LCoS的WSS交换机进行分区，以实现功能在多个层级（包括多通道和刀片上的节点）间的分布。
- 创建激光泵浦农场，实现跨多个光纤段/角度的优化泵浦共享。
- 高速、多接入测试与测量能力内置于每个节点，服务于每段光纤/每个节点。
核心技术的再利用
- Proven technologies, like 100G coherent optics, are adapted for compact, low-power deployment in edge environments.
前进之路
As optical networking expands into Metro/Edge/Access Networks, the guiding principle is clear - reduce complexity and accelerate deployment. Innovations must focus on:
- Cost-effective, scalable solutions.
- 核心网络与边缘网络的无缝集成。
- 内置诊断、测试和维护功能。
By leveraging advanced optical components and integrated technologies from Coherent, network operators can deliver high performance and simplified operations—without sacrificing capacity or flexibility. As the industry moves toward the dynamic and demanding environment of the metro edge, success will depend on solutions built specifically for scale, efficiency, and openness. Coherent is delivering those solutions—purpose-built to meet the challenges of the edge and power the next generation of optical networks.
