Virtual Topology Design of Multiservice Optical Networks

Abstract

Wavelength division multiplexing is the most effective way to take advantage of the huge transmission bandwidth provided by the optical media, but the possibility of increasing transmission speed by sharing the same physical link with many optical channels is not the only feature allowed by this technology. Wavelength division multiplexing can also be used to route traffic transparently through some network nodes, thus requiring less electronic data processing at intermediate nodes of a certain traffic route. In such a wavelength-routed network, the traffic is routed through a virtual topology, composed by concatenated ligthpaths embedded in the physical topology of fiber links. This work proposes a new approach to the virtual topology design problem in the core of the Mixed-Integer Linear Program formulation, suitable for a multiservice optical networks. This new formulation allows traffic partitioning in classes and differentiated delay constraining for each traffic class, providing an analysis of its influence on congestion.