Differentiated Survivability Framework and Modeling for Heterogeneous Grooming Optical Networks

This paper addresses the problem of dynamic routing of survivable sub-lambda traffic in heterogeneous grooming optical networks wherein sub-lambda client layer connections are multiplexed onto lambda connections on the optical layer. We present a differentiated survivability framework, which includes multi-layer survivability approaches with improved resource sharing methods based on inter-layer and inter-class resource sharing techniques. In addition to this, a new graph based network model is proposed, which supports both 1) the heterogeneity in a network, and 2) the coexistence of inter-layer and inter-class based resource sharing methods. The suitability of the model for a critical must-use grooming port scenario is presented. A tradeoff phenomenon between transceiver-usage and reserved links, which is inherent in the inter-layer sharing methods, is illustrated. Simulation experiments are carried out, and the performance variation and the tradeoff phenomenon are investigated.