(In 1966, the "father of optical fiber" Dr. Kao Kun first proposed the idea of ??optical fiber communication. In 1970, Lin Yanxiong of the Bell Institute developed a semiconductor laser that could work continuously at room temperature. In 1970, the loss of Kapron (Kapron) of Corning Corporation was 20dB/km fiber. 1977 Chicago's first 45Mb/s commercial line.)
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