ホップ数に応じて波長変換を行うWDMネットワーク光パス設定方式

概要

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In WDM (Wavelength Division Multiplexing) networks, blocking probability becomes higher as the number of hops to a destination increases because the same wavelength has to be used on all associated links. Blocking probability can get lower by using wavelength converters. However, it is not cost effective to equip wavelength converters to all nodes. In this paper, we proposed a new optical wavelength path establishment method with less number of wavelength converters based on the transition of blocking probability. We set a threshold number, which limits the number of hops to a destination. Our basic idea is to select a route via wavelength converters when the number of requests are more than the threshold. The method is to achieve lower blocking probability and fewer numbers of wavelength converters by applying a proposed algorithm for requests more than the threshold number. By simulations, we showed that the proposed method achieves lower blocking probability and a fewer number of wavelength converters than the existing methods.
2011-04-30