为了使光缆成为贯通海峡之间和孤岛之间的通信传输线路,最近,日本电信电话公司在伊豆半岛的伊东市八幡野海域敷设光缆,成功地进行了一次现场实验。光纤应用于海底电缆的实验,早在1980年于伊豆稻取和河津间就进行过,但该实验系采用无 In order to make the optical fiber cable a communication transmission line between the straits and isolated islands, Nippon Telegraph and Telephone Corporation recently successfully conducted a field experiment by laying optical fiber cables in the Yachimano, Ito, Izu Peninsula. Experiments using optical fibers for submarine cables were carried out in Izu and Obihiro between 1980 and 1980, but the experiment used no