In 1976, the Bell Institute of the USA constructed the first fiber optics interaction speculative system in Atlanta, making use of an optical cable television service containing 144 fiber optics made by Western Electric. In self-supporting adss optical fiber cable
, commercial optical cables constructed from multimode optical fibers began to be used on inter-office trunk lines and likewise a number of long-distance lines in the city. cable fiber optical sc
made of single-mode fiber optics began to be used on long-distance lines in 1983.