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首先描述了目前多种光传输体制并存的局面，然后分别阐述了SDH和DWDM的技术演进以及光网络OTN的核心技术，接着讨论了SDH和DWDM/OTN对IP业务的适应，其中提出了融合节点技术，最后简要论述了OTDM和光孤子的技术问题。
First of all, it describes the coexistence of a variety of optical transmission systems, and then describes the evolution of SDH and DWDM technologies and the core technologies of optical network OTN respectively. Then it discusses the adaptation of SDH and DWDM / OTN to IP services. The fusion node Technology, and finally briefly discusses the technical problems of OTDM and optical solitons.