Abstract
We propose what we believe is a novel ring-based local access Passive Optical
Network (PON) architecture that addresses some of the limitations of current tree-based
PON architectures including supporting private networking capability. Specifically, we
propose and devise a simple ring-based Ethernet PON (EPON) architecture that supports a
truly shared LAN capability among end users as well as upstream access to the central
office. Unlike a typical ring-based PON topology in which the optical line terminal
(OLT) and the optical network units (ONUs) are interconnected via a long fiber ring,
under the proposed architecture, ONUs are interconnected via a short distribution fiber
ring in the local loop but share the standard trunk feeder fiber for long reach
connectivity to the Central Office (CO). The main characteristic of the proposed
architecture is that it supports a fully distributed control plane among the ONUs for
ONU-ONU communication as well as upstream access to the OLT. This architecture is well
suited for an autonomous access environment such as a university campus or a private
corporation where several buildings are closely dispersed within a 0.5-1 km diameter
area.
© 2006 Optical Society of America
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