全球海底光缆传输网络的节点职能与鲁棒性评价

Submarine cable transmission network is an important infrastructure support for global information transmission and factor flows; the node function of a country or region in the global submarine cable network and its impact on network robustness are related to national information communication security. In this background, based on the global network infrastructure database of Infrapedia, this paper extracts the global optical cable distribution data from 1991 to 2017 for nearly 30 years, and studies the characteristics and evolution of "transmission function" and "hub function" undertaken by different countries or regions in the global optical cable network by using complex network analysis method, and explores the robustness of the global submarine optical cable network. The results show as below: (1) the information transmission function and hub function of a country or region have different patterns: the information transmission function is relatively flat and presents an obvious corridor effect, in which the countries or regions along throat straits occupy an important position, while the hub function has an obvious hierarchical structure. (2) The geostrategic location adjacent to the strait, powerful national strength, and rapidly growing market demand shape important nodes in the global submarine cable network together. (3) The failure of some nodes (especially those with high betweenness centrality) will lead to the significant decline of the whole network function. The paper puts forward the enlightenment of enhancing the submarine information network security of China from the aspects of avoiding the singleness of submarine optical cable links and improving the function of the global hub.