Challenges in next-generation optical access networks: addressing reach extension and security weaknesses
Challenges in next-generation optical access networks: addressing reach extension and security weaknesses
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DOI：
10.1049/iet-opt.2011.0027
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发表时间：
2011-08
影响因子：
1.6
通讯作者：
L. Kazovsky;Shing-Wa Wong;Vinesh Gudla;P. Afshar;She-Hwa Yen;S. Yamashita;Ying Yan
中科院分区：
文献类型：
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作者：
L. Kazovsky;Shing-Wa Wong;Vinesh Gudla;P. Afshar;She-Hwa Yen;S. Yamashita;Ying Yan
最近，宽带光接入网络正在世界范围内部署，以向终端用户提供大带宽。目前，运营商主要在其网络中部署时分复用（TDM）无源光网络（PON）。随着带宽需求的持续增长，业界进一步选择了几种下一代光接入（NGA）选项，以从当前的TDM-PON架构升级。除了增加带宽要求之外，当前的TDM-PON还受到有限的到达范围和分光比的影响。为了进一步降低当前TDM-PON的资本和运营支出要求，NGA架构必须整合中心局站点的数量。长距离光接入（LROA）架构是采用光放大器来增加光预算以支持分布网络中的更长距离和更高分光比的有前途的解决方案。随着LROA中共享物理介质支持的终端用户越来越多，接入网的安全性变得越来越重要。本文的第一部分回顾了重要的LROA架构及其支持技术。此外，在目前的文献中，很少有作品解决LROA的安全弱点。本文的第二部分回顾了这些安全弱点，以及监测和控制技术在当前的TDM-PON。此外，一类新的准被动和可重构设备，提出了解决上述安全弱点，是适合LROA。
Recently, broadband optical access networks were being deployed worldwide to deliver large bandwidth to end users. Currently, the operators have been mainly deploying time-division multiplexing (TDM) passive optical networks (PON) in their networks. As bandwidth demand continues to increase, the industry further selected several next generation optical access (NGA) options to upgrade from current TDM-PON architectures. Besides increasing bandwidth requirement, current TDM-PONs suffers from limited reach and split-ratio. To further reduce the capital and operational expenditure requirements of current TDM-PON, NGA architectures must consolidate the number of central office sites. Long-reach optical access (LROA) architectures are promising solutions that employ optical amplifiers to increase optical budget to support longer reach and higher split-ratio in the distribution network. As more end users are supported over shared physical medium in LROA, access network security is of greater importance. The first part of this article reviews important LROA architectures and their enabling technologies. Moreover, few works in current literature address security weaknesses in LROA. The second part of this article reviews these security weaknesses as well as monitoring and control techniques employed in current TDM-PONs. In addition, a novel class of quasi-passive and reconfigurable devices is presented that addresses aforementioned security weaknesses and is suitable for LROA.