Preconfigured structures for survivable WDM networks

Abstract

Network survivability against component failure is an important issue in WDM (Wavelength Division Multiplexing) optical networks. This includes failure detection, localization and isolation (i.e. protection or restoration). In this paper, we focus on link-based failure localization and protection in WDM networks. Different preconfigured optical structures including simple, non-simple cycles and trails are discussed, and their applications in fast link failure localization and protection are studied. We generate solutions using ILPs (Integer Linear Programs) and analyze the pros and cons of each structure. Our analysis shows that simple cycles can be regarded as a special case of non-simple cycles, and both simple and non-simple cycles are special cases of trails. Therefore, trails provide the most general and flexible structure to generate the best solutions. Copyright © 2008 ACM.