Survivable Routing Mechanisms in Optical WDM Networks

Abstract

The recent advancements in Wavelength Division Multiplexed (WDM) optical networks newlineenable the telecommunication and data networks to operate at extremely high data rates newlineat a relatively lower cost per bit. Such modern all optical networks provide tremendous newlinebandwidth with a lower latency and better Quality of Service (QoS). The wavelength newlinerouted WDM network carries many light carriers of different wavelength, routed through newlinea network switching fabric under suitable control algorithms to meet the required newlineflexibility and reliability. Such wavelength-routed networks have emerged as a newlinetechnology of choice to meet the growing bandwidth demand of real time high-speed newlinenetworks. These high speed backbone transport networks are generally prone to newlinecomponent or links failure which causes a huge information loss. Therefore, a robust newlinesurvivable WDM mesh network becomes an essential requirement for the acceptable newlinereliability. Survivability in these networks further needs quick restorability of lighpaths newlinethrough proper provisioning during the link or component failure. newlineSurvivable routing for network survivability, thus becomes an area of importance in the newlinefield of network design, development and research. Interrupted failed traffic may be newlinerestored through survivable routing under wavelength continuity constraint, which newlinerequires a proper provisioning of resources. In WDM optical networks it can be achieved newlineby setting up link disjoint primary and backup lightpaths for the connection requests. newlineHence, the problem of survivable routing and wavelength assignment is critically newlineimportant to enhance the network performance. The key challenges for survivable optical newlinenetworks are to devise routing mechanisms which can determine lightpaths intelligently newlineto yield the best network throughput at minimum resource consumption. Overall newlinenetworks blocking performance, throughput and restoration capability is influenced by newlinethe way information and network parameters are to be utilized to take the routing newlinedecision. Thus, sustained advancements in op