Hybrid Optical Switching Network Survivability Design And Multicast Research

With the dramatical development of networking technology, IP traffic became prevailing traffic in broadband communication networks. As the main transport networks, however, optical networks which adopt Optical Circuit Switching (OCS) couldn't meet this demand. In order to maximize the resource utilization, networks need to provide the packet switching in optical level (OPS). Due to technological constraints, OPS devices are infeasible in the near future. Optical burst switching (OBS), which is designed to achieve a balance between OCS and OPS, is not as mature as OCS. To improve the overall performances, hybrid optical network architectures are proposed to combine the advantages of different swithing technologies while avoiding their disadvantages.On the other hand, with the rapid growth of traffic, a failure in optical networks may cause the tremendous loss, and then network survivability in optical networks becomes a critical concern. To achieve reliable data transmission, huge protection resources are required to construct networks. Howevere, these huge protection resources are idle when there is no failure. This thesis proposes a hybrid optical network based on protection resources to transport overspill data in OBS manner. Besides, this hybrid network adopt both OCS protect schemes and OBS restoration schemes to guarantee survivability and restore part of data transmission even in the case of multiple failures without deploying more protecton resources.Finally, this thesis focus on research in multicast routing in hybrid network, because the multicast traffic experienced growth in tremendous rate and became the important part of IP traffic. To reduce the network constraction cost, networks are required to configure light-splitting nodes paresly. Every light-splitting node reprents a separate district and other nodes are partitioned into correspond districts. Internal multicast data was transported through idle protection resources in OBS manner to enhance wavelength utilization and inter- district multicast data was transported through lightpaths in OCS manner to achieve higher transportation efficiency.