Refereed Conference Papers

minimum traffic disruptions in reliable WDM-based mesh networks, ” Photonic Network Communications, vol. 6, no. 3, pp. 265–277, Nov. 2003. 2. S. Ishida, S. Arakawa, and M. Murata, “Virtual fiber configuration for dynamic lightpath establishment in large-scaled optical networks, ” Photonic Network Communications

Virtual Fiber Configuration for Dynamic Lightpath Establishment in Large–Scaled Optical Networks

Recently, progress has been made in the Generalized Multi–Protocol Label Switching (GMPLS) and Automatic Switched Optical Networks (ASON) standardizations. These technologies realize construction of large–scaled optical networks, interconnections among single–domain Wavelength Division Multiplexing (WDM) networks, and direct communication over multi–domain WDM networks. Meanwhile, it is known that the topology of the Internet exhibits the power–law attribute. Since the topology of the Internet, which is constructed by interconnecting ASs, exhibits the power–law, there is a possibility that large–scale WDM networks, which are constructed by interconnecting WDM networks, will also exhibit the power–law attribute. One of the structural properties of a topology that adheres to the power–law is that most nodes have just a few links, although some have a tremendous number of them. Another property is that the average distance between nodes is smaller than in a mesh–like network. A natural question is how such a structural property performs in WDM networks. In this paper, we first investigate the property of the power–law attribute of physical topologies for WDM networks. We compare the performance of WDM networks with mesh–like and power–law topologies, and show that links connected to high–degree nodes are bottlenecks in power–law topologies. To relax this, we introduce a concept of virtual fiber, which consists of two or more fibers, and propose its configuration method to utilize wavelength resources more effectively. We compare performances of power–law networks with and without our method by computer simulations. The results show that our method reduces the blocking probabilities by more than one order of magnitude