Performance Analysis of Restoration Schemes in Survivable WDM Mesh Networks

Recent development in optical networking employing wavelength-division-multiplexing (WDM) fulfills the high bandwidth demand applications. Failure of such networks, leads to enormous data and revenue loss. Design a low cost survivable WDM network is always an interesting and difficult process. In this paper we present link-path model for capacity allocation and calculate blocking probability in survivable WDM networks. We consider both path restoration and link restoration schemes, and compare their performance in practical networks. We found that path restoration scheme consumes less network resource compared to link restoration scheme, where as, blocking probability reduces rapidly when we increase the number of wavelengths. Multi-commodity maximum flow (MCMF) method is used in the modeling. Shortest path algorithm is considered for generating the different paths between the source-destination pairs. Index Terma—Blocking Probability, Restoration, Working Capacity, Spare Capacity, Survivability, WDM Networks.