中文摘要：

简要介绍了下一代光接入网络上构建安全的虚拟专网存在的挑战以及网络编码的特性，重点研究基于网络编码构建安全多虚拟专网的机制。依据提出的机制，多个安全的虚拟专网可以在无源光网络的下一代光接入网络的主要实现形式上独立构建。最后分析了提出的虚拟专网机制，提高了下行数据传输吞吐量。

英文摘要：

This paper briefly described the challenges in secure virtual private network （VPN） construction over next genera- tion optical networks and the characteristics of network coding, it focused on the construction scheme of multiple secure VPNs based on network coding. On the basis of the proposed scheme, multiple secure VPNs could be independently established over passive optical network （PON） which was the realistic deployment for next generation optical access networks. Finally, it ana- lyzed the downlink throughput gain introduced by the proposed scheme.