Failure localization in all-optical mesh wavelength division multiplexing (WDM) networks

故障定位一直被认为是全光波分复用（WDM）网状网控制和管理中的一项关键任务，它关系到能否部署有效的生存路由和故障相关保护方案。由于问题的重要性，该项目通过通用的带外监测，在网络光域中探索新的框架和方法，其中启动监督光路（S-LP）以获取网络故障状态并定位故障的共享风险链路组（SRLG）。我们首先调查和制定一个有趣的情况下，网络故障管理系统，称为网络范围内的本地Unambibibilance故障定位（NWL-UFL），每个节点可以立即和精确地识别故障SRLG根据本地可用的开关状态的S-LP的问题。这是为了完全避免任何可能的控制平面信令工作，使得故障定位可以仅在光域中执行。由于NWL-FUL S-LP解决方案可能会消耗大量的监测资源时，SRLG的数量是大的，我们引入了监测突发（m-burst）的框架，旨在贸易的监测响应和控制信令开销与消耗的监测资源。基于前两个主题中的知识和技术，我们将进一步研究可生存路由和故障定位的集成设计，其中一个新的框架称为故障假定保护（FPP）将进行研究。 我们设想，所提出的研究将产生重大影响的研究社区的光网络故障管理。预计所提出的技术可以在不久的将来在现实世界的网络中找到应用，由于其高度工程化的性质。我们还期望所提出的技术可以迁移到其他应用场景，例如使用激光束的触摸屏面板设计，VLSI设计和自动诊断，以及关键任务自组织和传感器网络的监控。

Failure localization has long been considered as a critical task in the control and management of all-optical Wavelength Division Multiplexing (WDM) mesh networks, which concerns whether an efficient survivable routing and failure-dependent protection schemes can be deployed. Motivated by the importance of the problem, this project explores novel frameworks and approaches in the network optical domain via generic out-of-band monitoring, where supervisory lightpaths (S-LPs) are launched to acquire network failure status and localize the failed shared risk link group (SRLG). We first investigate and formulate the problem for an interesting scenario of network fault management systems, called Network-Wide Local Unambiguous Failure Localization (NWL-UFL), where every node can instantly and precisely identify the failed SRLG according to locally available on-off status of the S-LPs. This is to completely avoid any possible control plane signalling effort, such that the failure localization can be performed exclusively in the optical domain. Since NWL-FUL S-LP solutions may consume significant amount of monitoring resources when the number of SRLGs is large, we introduce a framework of monitoring burst (m-burst), aiming to trade the monitoring responsiveness and control signalling overhead with the consumed monitoring resources. Based on the knowledge and techniques developed in the previous two topics, we will further investigate an integrated design of survivable routing and failure localization, where a new framework called Failure Presumed Protection (FPP) will be studied. We envision that the proposed research will yield significant impacts on the research community of optical network fault management. It is expected that the proposed technologies can find applications in real-world networks in the near future due to their highly engineering in nature. We also expect that the proposed technologies can be migrated to other application scenarios, such as touchscreen panel design with laser beams, VLSI design & automatic diagnosis, and monitoring for mission-critical ad hoc and sensor networks.