Hello, everyone!
In 1976, the Baer Research Institute of the United States built the first optical fiber communication experimental system in Atlanta, using the 144 generation optical fiber cables made by Western Electric Co. In 1980, commercial optical cables made of multimode fibers began to be used in Intercity trunks and a few long-distance lines. The commercial optical cable made of single-mode fiber began to be used on long distance lines in 1983. In 1988, the first submarine cable laying across the the Atlantic sea between the United States and Britain and France was successfully laid. Shortly after that, the first submarine cable was constructed across the Pacific Ocean.
In 1978, China developed its own communication optical cable, using multi-mode optical fiber, and the cable core structure is layer twisted. Field tests were carried out successively in Shanghai, Beijing and Wuhan. Shortly after that, it was used as interlocal trunk line in the city telephone network. After 1984, it was gradually used in long-distance lines and began to use single-mode optical fiber. The communication optical cable has greater transmission capacity than copper cable. The relay section has a long distance, small volume, light weight, and no electromagnetic interference. Since 1976, it has developed into backbone lines for long-distance trunk lines, urban relay, offshore and transoceanic submarine communication, and local area network and private network. Integrated services digital network provides transmission lines.
Thanks.
