Distributed Resource Reservation In Intelligent Optical Networks

Resource reservation is essential in intelligent optical networks. Considering the weak scalability and poor survivability of centralized scheme, distributed resource reservation schemes are preferred in large-scale optical networks. This dissertation undertakes a detailed study of distributed resource reservation schemes by means of simulations, theoretical analyses and network experiments.This dissertation develops a discrete-event simulation tool for distributed reservation schemes and compares the performance of distributed reservation schemes with different network environment and protocol parameters. The results indicate that the resource contention is a critical issue in distributed controlled networks.Two analytical models are presented to investigate the blocking performance of distributed reservation schemes. These two models are based on the independent assumption and the correlation assumption, respectively. These models are applicable to bidirectional lightpath requests. They take into account the effects of different kinds of network delays, which include the signaling transmission delay, signaling processing delay, and optical cross-connects operation delay. Furthermore, the independent model can be used for the analyses of different wavelength assignment policies and can be extended to multi-fiber networks circumstances.This dissertation discusses the ways of decreasing the network blocking probability for distributed reservation schemes, and then proposes an adaptive hybrid reservation protocol (AHRP). Results show that the AHRP possesses the lowest blocking probability, shorter setup delay, and less signaling overhead.The performance of different distributed reservation schemes is investigated under both single and multi-fiber circumstances. Simulation results indicate that there is not any scheme that can achieve excellent performance in both single and multi-fiber networks. This dissertation extends the schemes for multi-fiber networks. Results show that this scheme gives an outstanding performance in both single and multi-fiber networks.This dissertation studies resource reservation schemes in distributed path restoration circumstances. It is found that the resource contention will significantly degrade the success ratio of restoration. A novel distributed restoration control scheme is proposed. Simulation results indicate that this scheme improves the success ratio while remaining a short restoration time.A test-bed for fundamental researches on WDM all-optical networks is implemented, which is the first experimental system of ASON (Automatic Switched Optical Networks) in China. Several experiments related to the distributed control of optical networks are demonstrated with this test-bed.