Cable History

In 1977, the world's first fiber-optic communication system commercially in the U.S. city of Chicago, the rate of 45Mb / s. Into the practical stage, optical fiber communication applications has grown rapidly, the application of optical fiber communication system has several replacement. 70 years of optical fiber communication system is mainly used multimode fiber, the application of fiber short wavelength (850 nm) band (1 nm = 1000 trillion of a meter, that meter). 80 years and then gradually switch to long-wavelength (1310 nm), the gradual introduction of single-mode optical fiber, to the early 1990s, 50 times the communications capacity to expand, to 2.5Gb / s. After the 1990s, and from 1310 nm transmission wavelength of 1550 nm wavelength shift for longer, and began to use optical fiber amplifiers, wavelength division multiplexing (WDM) technology and other new technologies. Communications capacity and distance relay continue to grow exponentially. Widely used in local telephone and long distance communications trunk lines, the backbone of a communications line.

1980, made ​​by the multi-mode fiber optic cable business started in the city and a few long-distance inter-office trunk lines used. Made of single-mode fiber optic cable in 1983, commercial long-distance lines in use. In 1988, the connection between the United States and Britain and France the first successful trans-Atlantic submarine cable laying, and soon built the first trans-Pacific submarine cable. China in 1978, developed their own communications cable, using multi-mode optical fiber, cable twist-type layer structure of the heart. Has worked in Shanghai, Beijing, Wuhan and other places to carry out a field test. Soon after in the local telephone network between the trunk within the trial as a Board, after 1984, gradually for long-distance lines, and began to use single-mode fiber. Communication cable greater than copper cable transmission capacity, long-distance relay, small size, light weight, no electromagnetic interference, since 1976 has developed into a long haul, city relay, coastal and transoceanic submarine communications and LAN, private network backbone transmission lines and other cable and start the loop wiring to the city's network of field users to develop, for the fiber to the home, wide-generation integrated services digital network to provide transmission lines.