A collection of access connections supported by an optical transmission system that are shared across the same network side interface. The optical access network may contain a number of optical distribution networks (ODN) and optical network units (ONU) connected to the same optical line terminal (OLT).sketch
Optical Access Network (OAN) generally refers to an access network that uses optical fiber as the transmission medium in whole or in part between the local switch, or the remote module and the user. The current access network is mainly copper network (such as twisted pair telephone line), which has high failure rate and high maintenance and operation cost. OAN is introduced first to reduce the maintenance and operation cost and failure rate of copper network, second to support the development of new services, especially multimedia and broadband new services, and finally to improve the user access performance. The transmission service on the copper cable is often subject to various interference and distance restrictions, the user access rate is generally not very high, and the transmission distance is usually limited within 10km. The optical fiber access network is technically far superior to the copper cable network, and is far less strong than the copper cable network due to environmental interference and distance restrictions, and the optical fiber transmission rate is higher than the traditional copper cable transmission rate. It has very obvious development potential. Adopting optical access network has become the main way to solve the bottleneck of telecommunication development. Optical access network is not only suitable for new user cells, but also the main alternative means to update the existing copper cable network.
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