Packet Switching Performance of WDM

In this paper, we analyze the performance of a packet-switched broadcast-and-select all-optical network with N nodes and W wavelengths. We model the network as an N N space-division time-slotted packet switch. Each input port has a buuer to store incoming packets until they are switched. In each time slot, a set of W ports is selected to transmit their head-of-line (HOL) packets. We consider the eeects of the input queueing dynamics on the network performance, and present a queueing analysis of networks supporting multicast traac with fanout splitting. We obtain the maximum supportable throughput as a function of the network size, the number of wavelengths, and the multicast size. The average multicast packet delay is evaluated as a function of network and traac parameters. It is found that increasing the number of wavelengths beyond 40% { 60% of the number of nodes results in little improvement in network performance. We also study a second switching scheme that yields higher overall network throughput at the expense of introducing packet dropping. Finally, we investigate the eeects of using multiple receivers at each node and demonstrate signiicant performance improvement over a single receiver per node architecture.