Proactive Contention Avoidance Scheme with Dedicated Wavelength Assignment in Optically Burst-Switched WDM Networks

This paper proposes a proactive contention avoidance scheme with dedicated wavelength assignment in optical burst switching networks. Using dedicated wavelengths, we construct several routes from each ingress node in the following way. We first construct spanning trees at respective ingress nodes and assign dedicated wavelengths to them, based on the amount of lost traffic. Further, using unused wavelengths in each link, we construct partial trees at each ingress node, again based on the amount of lost traffic. By this way, contention at intermediate core nodes is completely eliminated, and contention is localized at each ingress node, which can be resolved by means of electric buffers. Through simulation experiments, we show that the proposed scheme can achieve the burst loss performance superior to that in the shared wavelength scheme with full wavelength conversion and shortest-path routing.