Flexible WDM Solution for DSL Backhaul

DSL backhaul is an increasingly important access application for metro optical networking. It is driven by massive rollouts of triple-play and IPTV services. Critical challenges for optical networks in supporting DSL mass rollout are simplicity, cost, and scalability. We propose the concept of a Gigabit Ethernet or Multi-Service Add/Drop Multiplexer (GbE/MS- ADM) which is directly combined with CWDM access technology. We show that such a GbE/MS-ADM provides superior access flexibility, together with a net bandwidth gain for multicast services over static solutions, and also enhanced optical parameters which again make it more useful as compared to standard OADM technology. Since the GbE/MS-ADM is based on 4-Gb/s technology, it is also cost-optimized over 2G5 and 10G solutions, and also over Black Link alternatives.