全业务光纤接入网:无源光网络上的ATM传输

Full Service Optical Access Networks: ATM Transport on Passive Optical Networks

多媒体通信已经成为在公共网络中建立宽带系统的主要动力.实现宽带交互接入网有各种不同的解决方案,如建立光纤网,用双绞线对的ADSL对现有铜线网络进行升级,或在有线电视网中采用光纤同轴混合电缆.在这些不同的方案中,光纤接入网被认为是最能适应未来发展的解决方案.尤其是无源光网络(PON)已被证明是把光纤引入接入网的一种经济有效的方式.文章介绍无源光网络中基于ATM的传输.首先介绍现在实施的已经过各种试验的ATM无源光网络(APON)系统,然后介绍高分支的远程无源光网络.还结合上行突发模式光放大等具体技术探讨用户数和距离的增长问题,并重点介绍ACTS PLANET计划的工作内容.

Multimedia communication has become the driving force for installing broadband systems in the public network. Different alternative solutions have been presented to realize a broadband interactive access network, such as installing optical fiber or upgrading the existing copper network with ADSL for twisted pair or hybrid fiber coax for CATV networks. Among these alternatives,optical fiber access networks are seen as the most future-safe solution. Especially, passive optical networks prove to be a cost-effective way to introduce fiber into the access network. This article presents ATM-based transport on passive optical networks, starting with a current implementation of an ATM-PON (APON ) system that has already been installed for various trials. It further describes the evolution of APON systems to high-splitting,long-range PONs. The increase in both number of subscribers and distance range will be discussed in combination with some specific technological issues such as upstrean burst mode optical amplification. Special emphasis will be placed on the work carried out within the scope of the ACTS PLANET project.