本文介绍了城域网设计的相关技术,并在此基础上,提出了基于自愈功能的城域光传输网的设计方案,分别对核心层和接入层进行了设计,重点介绍了核心层的SDH自愈环的设计,并对工程中所用光纤合理性做出了理论验证。 This paper introduces the related technologies of MAN design, and on this basis, puts forward the design scheme of metro optical transport network based on self-healing function, designs the core layer and access layer separately, and emphatically introduces the core layer SDH self-healing ring design, and made a theoretical validation of the fiber rationality used in the project.