Efficient and costless monitoring mechanism in metro-access network

Fast and unambiguous link or node failure localization is very important and necessary in optical network. But it is not always clear what constitutes a good method to monitor the whole network. In an effort to understand the benefits and drawbacks of existing methods, we empirically present two state-of-the-art methods: monitoring trails method and optical coding method for their ability of monitoring time, cost, scalability and centralized management performance. Then a new fault location method combining the advantages of two schemes in the mesh-tree network that can be used for metro-access network is introduced. At the same time, performance analysis of monitoring scheme is obtained. It can be seen that the proposed method can monitor the whole optical network effectively with low cost and good scalability. The technique can support high network capacity.