Performance evolution in optical burst switched networks

Optical burst switching (OBS) that combines the advantages of OCS and OPS is an emerging technology to exploit the potential benefits of optical communication, that allow variable burst sizes and has gained much attention from both academic and industry. Low delay and also to reduce burst overlap in the electronic domain of an ingress node and hence to reduce burst loss improves quality of service (QoS). A mathematical model for delay versus traffic loads considering both low and large traffic conditions is developed. In a metropolitan ring network the minimum delay zone is shown considering the variation of channel capacityC, burst size B, and token round trip time R. In a general OBS node it is required to delay some of the transmission of bursts in the ingress node with an electronic buffer. It is shown that in a burst overlapping condition, at lower traffic loads, data produces more delays and increases with the increase of delayed burst time, but at higher loads, the delays are almost same for all values of delayed burst time.