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光纤通信新技术推动长途通信网发展（下）中国科学院院士张煦三、扩大通信容量随着信息时代来临，通信业务量逐年迅速增长，各地区接入网的长途通信业务拥向长途网。长途干线的任务是集中传输，因而其业务量增长特快。在数字通信开始时，数字速率为几十兆比特每秒，目前已...
New Technologies in Optical Fiber Communications Promote the Development of Long-distance Telecommunication Networks (Part Two) Zhang Xu, Academician of the Chinese Academy of Sciences (3) Expansion of Communication Capacity With the advent of the information age, the volume of communications services has increased rapidly year by year. Long-distance communications services in access networks in various regions have been extended to long-distance networks. Long-distance trunk line mission is to focus on transmission, so its business growth is rapid. At the beginning of digital communications, the digital rate is tens of megabits per second, currently ...