The single-hop star-based network is proposed as a feasible topology to fit the rapidly-increasing bandwidth requirement in the AAPN research project. This paper investigates the node architecture to implement all-optical operations in such a network using available technologies. Based on the node placement in the network, two architectures are designed, one is placed in the edge and another one is used in the core. The edge node is a multi-stage electronic/optic switch, which aggregates legacy traffics and transmits them to the core node, or accepts optical messages from the core node and sends them to legacy networks. Each stage uses either electronic or optical components to implement signal storage, conversion or transmission. The core node is an all-optical switch which switches optical signals in different wavelength planes, while the controlling part works in electronic domain. A separate control plane is designed to manipulate the operation of different component devices. This system provides a common platform for the overlaid-star network. By introducing synchronization or not, we can employ reservation-based optical time-division-multiplexing (OTDM) or contention-based optical burst switching (OBS) in the designed architecture. No wavelength conversion or optical buffering is necessary by agilely scheduling the messages in both mechanisms. Our research is an efficient and feasible solution which satisfies the transmission requirement by taking into account of technological availability. Our design is supported by the performance evaluation of OTDM and OBS methods, and their comparisons under different scenarios.
The performance of an optical burst switching network is determined by the comprehensive effect of various parameters. This paper presents analysis results of an all-optical burst switching network which consists of edge nodes, which are responsible for traffic aggregation and distribution, and core nodes, which transmit payload data burst in the optical domain. Some essential parameters are compared on their effects on implementing switching operation, contention resolution and routing functions. We have examined the interrelationship of these parameters. Typical performance criteria are investigated in a sample OBS network.
We construct a multi-stage optical switch model with multilayer Kautz graphs. The switching path is built up by using the routing principle in the regular graph. A 3-stage switch is demonstrated. The modeling study shows pretty good statistics in terms of latency, packet loss and capacity. Implementation of this architecture with star couplers and other optical components is also discussed.