Performance of broadband DWDM networks

Broadband companies have started deploying DWDM networks for the transport of narrowcast (NC) services such as telephony, high-speed-data and video-on-demand. In this paper we compare the performance of four different broadband DWDM architectures. All four architectures describe a broadband DWDM overlay system between the HE and the hub for the transport of NC services. Separate fibers are required for the DWDM overlay and for the broadcast (BC) transport since otherwise the SRS-induced crosstalk would destroy the signal quality of the predominantly analog BC video channels. At the hub, each of the demultiplexed wavelengths carrying the NC signal is routed to a specific node. The differences in the architectures lie in the way the BC and NC signals are combined prior to distribution over the coax plant.