(Optical fiber communication has always been the most important method of information transmission in my country. Since the 1970s, optical fiber communication technology has made great progress in my country. Although it has gone through the "winter of optical communication", it has not affected its major development trend. This article firstly summarizes the use and research status of my country's optical fiber communication (including related system equipment, optical fiber cable and optical equipment technology) in the core network, metropolitan area network and access network, as well as the next development.)