Network protection and OA&M mechanism for WDM optical path transport networks

To realize a large scale and robust photonic transport network, this paper proposes a network protection strategy and maintenance signaling flow for WDM optical path transport networks. The network protection strategy is applicable for mesh-type WDM optical path transport networks, and the OA&M flow that is required for the network to recover from failures are clarified. The proposed OA&M flow does not rely on the OP-AIS (optical path alarm indication signal) generation method. This signaling method can also be applied to the all-optical type network