In 1976, AT & T (a U.S. company) installed an optical fiber cable between Atlanta and Chicago; the first long-distance on-the-spot testing of such a system. This optical cable replaced the former copper cable traditionally used as a means of communication.
一九七六年，美國電話電報公司（AT&T）把光纖製成的電纜，架設在亞特蘭大和芝加哥之間，形成一個長距離現場試用系統，從此光纖電纜勢將取代傳統銅纜，成為通訊的主流。