A HYBRID STAR-RING-BUS ARCHITECTURE FOR WDM METROPOLITAN-REGIONAL ACCESS NETWORKS

摘要

This work proposes a highly reliable, hybrid star-ring-bus architecture (SRBA) for broadband wavelength-division multiplexed (WDM) regional access networks. A delta-star network on the top level acts as high-capacity trunk infrastructure, whose weakness in reliability is overcome by the self-healing function of the concatenated ring network on the lower level. The ring network is divided into several delta regions, where the traffic load inside each region is unified to minimize the backup resources required in the network. On the bottom level, considerable bus subnets are constructed to serve end users. The idea of k-bands is introduced to efficiently manage wavelength carriers used in the network. Moreover, by means of the automatic protection switching (APS) systems in all the optical network units (ONUs), a minimum-hop rerouting protection scheme against fiber failure(s) is designed. Specifically, we carry out an experimental network to demonstrate the feasibility and survivability of the proposed architecture.