中文摘要：

对电信网中的核心网、城域网和接入网这三个部分的能耗进行了调研和总结,并对这三个网络部分的节能技术的发展现状进行了综述。最后,对光网络的节能技术的未来发展方向进行了展望。

英文摘要：

The telecom optical network consists of three parts： core network,metro network and access network.The paper investigates the energy consumption of the three network domains,and summarizes the energy-saving technologies of these three parts.At last,the paper predicts the future trends of the research on energy-efficient optical networks