随着广州地铁线网规模的持续扩大、业务需求的高速增长，结合广州地铁区域控制中心设置模式，既有的多业务传送平台(multi-service transport，MSTP)骨干承载网已经不能满足线网业务承载需要，迫切需要建设大容量的骨干承载网，以适应云计算、大数据以及人工智能(artificical intelligence，AI)等新兴技术应用带来的超大业务承载需要。从承载网的技术发展以及广州地铁骨干网业务特点等方面，对广州地铁新一轮骨干网的技术制式、组网架构、系统容量等进行分析研究，提出本次骨干网的技术选择应以大容量、易扩容为基本原则，结合当前技术发展，对光传送网(optical transport network，OTN)技术作为骨干网的优势给予充分阐述，明确本次骨干网建设采用OTN技术；在骨干网的组网结构方面，充分结合广州地铁区域控制中心的设置特点，推荐按照控制中心的定位采用双环组网方式；在骨干网的系统容量上，根据业务特点详细总结各区域控制中心之间的容量需求，结合OTN技术特点，确定本次骨干网采用单波100 Gb/s的系统，内外环均按照80波配置。
Owing to the continuous and rapid expansion of the Guangzhou metro line combined with the configuration of Guangzhou metro regional operation control center, the current MSTP (multi-service transport platform) backbone optical transmission network cannot fulfill the performance requirements of applications that use cloud computing, big data, or artificial intelligence (AI). As a result, a large capacity backbone optical transmission network is immediately needed. In this paper, the technical system, network structure, especially system capacity of the new round of backbone network of Guangzhou Metro are analyzed in detail, considering the technical development of the optical transmission network and the services characteristics of the backbone network of the Guangzhou Metro. First, the backbone optical transmission network should be selected based on the capacity and ease of expansion. Furthermore, the currently available technology and the advantages of OTN (optical transport network) technology, which will be adopted in the construction of the backbone optical transmission network, are fully described. Regarding the network structure, a dual-ring network mode is recommended according to the configuration of the regional operation control center of the Guangzhou Metro. Meanwhile, the capacity requirements of the backbone optical transmission network between the regional operation control centers are summarized in detail while the economic benefits are analyzed. As a result, the 100Gb/s single wave system is set as the system of the backbone optical transmission network in combination with the technical characteristics of OTN.