Sharp approximated model for WDM all-optical packet switched irregular networks

A detailed analytical traffic model for all-optical wavelength division multiplexing (WDM) photonic packet switched networks is presented and the requirements for buffer size, and link dimensions are analyzed. This paper shows that due to the topology, packets may generate traffic bottlenecks produced by a tendency of the routing scheme to send packets with different destinations through preferred paths. This effect increases the traffic load and hence the probability of blocking at the output links of specific routers in the network and therefore a large buffer depth is required or an increment in the number of fibers per link. Two router architectures are analyzed and it is shown that WDM all-optical router architectures with shared contention resolution resources are the best candidates to reduce hardware volume and cost of all-optical networks