For such traffic, bandwidth allocation circuit remain static can cause over-provisioning of bandwidth resources in order to meet QoS requirements. Optical burst switching (OBS) is a promising new technique that tries to overcome the problem of allocating resources efficiently for bursty traffic. In OBS, incoming data is assembled into the explosion on the edge of the network, and when the burst is ready to be sent, the network resources are provided only for the duration of the burst. Topics include: - Optical burst switching nodes and network architecture - Burst Assembly - Signaling protocols - Contention resolution - Scheduling Burst - Quality of service in OBS networks