Virtual Fiber Configuration for Dynamic Lightpath Establishment in Large-scaled Optical Networks |
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Authors: | Shinya Ishida Shin’ichi Arakawa Masayuki Murata |
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Institution: | (1) Graduate School of Information Science and Technology, Osaka University, 1–5 Yamadaoka, Suita Osaka, 565–0871, Japan;(2) Graduate School of Economics, Osaka University, 1–7 Machikaneyama, Toyonaka Osaka, 560–0043, Japan |
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Abstract: | 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. |
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Keywords: | Wavelength division multiplexing Lightpath Large-scaled network Power-law |
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