Role of Edge Connectivity and Centrality Factors in Survivable Optical Network Design

Survivability in optical networks is the ability to maintain the connections intact against failures. Protecting an optical link is critical since a link failure may lead to huge amount of data loss. The network can be represented as a graph and the edge connectivity is an important parameter in measuring the fault tolerance capability of the network. The node centrality factor represents the significance of the node in a network. This paper combines both the link metric and node metric to investigate the impact of edge connectivity and node centrality factors on the survivability of optical networks. A heuristic approach has been developed in which these factors are incorporated in optical network protection with an objective to improve the recovery performance with minimum network cost incurred. Single link failures are attempted based on shared path protection. Three irregular meshed networks are compared in terms of loss of traffic and cost aspects. The cost factor includes the number of wavelengths used along with the node cost and link cost. The wavelength requirements for varying the number of shared paths are also evaluated. Simulation results demonstrate that the performance of the proposed approach provides better solutions than the existing methods on optical network protection.