Distributed Fiber Sensing (DFS) leverages optical backscattering signals to predict failure events and enable just-in-time restoration in metropolitan optical networks, i.e., without optical amplifiers. In this paper, we study the effectiveness of proactive restoration based on DFS information in all-optical networks, while considering different sensing devices' capabilities. We evaluate whether restoration can be provisioned just-in-time before a failure happens, and its impact on key performance metrics, including the number of affected and suspended optical circuits, bandwidth blocking rate, and service downtime. Simulation results demonstrate that just-in-time restoration enabled by DFS with a prediction time capability of 15~ms can reduce circuit disruptions by more than 90\% compared to restoration without sensing and ensure optical service continuity in optical networks comparable to resource-intensive protection schemes, at a fraction of the spectral resources.

翻译：分布式光纤传感（DFS）利用光后向散射信号预测故障事件，并在城域光网络（即无光放大器场景）中实现实时恢复。本文研究了全光网络中基于DFS信息的主动恢复策略的有效性，同时考虑了不同传感设备的能力。我们评估了能否在故障发生前实现即时恢复，以及该策略对受影响和挂起光路数量、带宽阻塞率、服务中断时长等关键性能指标的影响。仿真结果表明，具备15毫秒预测能力的DFS实时恢复技术，相比无传感的恢复方案可减少90%以上的电路中断，并能在光网络中确保与资源密集型保护方案相当的光业务连续性，而频谱资源消耗仅为后者的极小部分。