Optical Burst Switching Conflict In The Network To Circumvent The Program Study

The amount of raw bandwidth available on fiber optic links has increased dramatically with advances in dense wavelength division multiplexing (DWDM) technology. However, existing optical network architectures are unable to fully utilize this bandwidth to support future highly dynamic and bursty traffic. Optical burst switching (OBS) has been proposed as a new paradigm to achieve a practical balance between coarse-grained circuit switching and fine-grained packet switching, hence, better utilizing the available bandwidth.In this dissertation, we analyze a number of issues involving the development of OBS technology, including hardware implementation, contention resolution mechanisms, support of quality-of-service, and TCP performance of OBS networks.A major problem in OBS networks is contention. We introduce several new approaches to reduce packet loss in OBS networks.An alternative scheme to reduce contention is a proactive contention resolution mechanism. Our proposed dynamic offset time scheme can effectively improve network performance by adjusting the offset time at each node according to the network status.One of the reactive contention resolution approached in OBS networks is delaying the data with FDL. We propose two schemes to take full advantage of FDL resources, proactive and reactive look-ahead contention resolution. In proactive look-ahead contention resolution, the core nodes equipped FDL delay the data to reduce burst overlap degrees, and in the other mechanism core nodes equipped FDL delay the data after receiving the delay requests from the downstream nodes.Finally, we propose several approaches to sparsely allocate FDL resources in OBS networks.We believe that the above contributions have addressed a number of fundamental issues facing practical development of OBS networks in order to be considered for future deployments.