波長変換器配置方法を考慮したWDMネットワーク光パス設定方式に関する研究

摘要

In WDM (Wavelength Division Multiplexing) networks, blocking probability becomes higher as the number of hops to destination increases, because the same wavelength has to be used on all associated links. Blocking probability becomes lower by using wavelength converters. However, it is not economical to equip wavelength converters to all nodes due to their cost. In this paper, in order to reduce the overall network blocking probability, efficient wavelength converters allocation scheme is proposed. Specifically, at the selected nodes with the use of indices of closeness cen-trality and degree centrality, wavelength converters are placed. The simulation results confirm that the proposed scheme achieves the same performance with smaller number of wavelength converters as compared with the conventional scheme.%WDM（Wavelength－Division－Multiplexing）技術は複数の異なる波長を多重して光ファイバで伝送することにより，大容量のデータ転送を実現する技術である．通常，WDMネットワークでは送受信ノード間の経路上の全リンクで同一波長を確保することで光パスが確立される．