Optical Access-Metro Networks

The majority of previous research activities to mitigate the first/last mile bottleneck and metro gap were carried out separately from each other. After paving in FTTX networks all the way or close to the end user with optical fiber, the next evolutionary step seems to be the optical integration of fiber-based access and metro networks. This chapter provides first an up-to-date overview of recently proposed all-optical access–metro networks. We then proceed with a discussion of the social impact of providing end users with advanced broadband access and a growing body of content and applications, e.g., on-line gaming and P2P file sharing, on their everyday lives as well as the implications with respect to the architecture and services of future optical access–metro networks. An all-optically integrating overlay for Ethernet-based access and metro networks is introduced which lets low-cost PON technologies follow low-cost Ethernet technologies from access networks into metro networks. The proposed approach enables an incremental add-on service for future applications such as on-line gaming and P2P file sharing as well as provides a fallback option for legacy ONU equipment and conventional triple-play traffic.

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