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一、前言光纤通信是七十年代兴起的新的通信技术,犹如异军突起,得到举世重视。其技术进展之速,推广应用之快,为通信技术史中所罕见。光纤通信以其通信容量大、不受电磁干扰及节约大量有色金属等优点,目前已在市话中继网中广泛开展应用。在长途干线通信网中,也处于实用化前夜,除美国正在兴建将于1985年建成由波士顿到华盛顿长约1000公里的长途干线光纤通信系统外,英国已宣布自1984年
I. Introduction Optical fiber communication is a new communication technology that emerged in the seventies. It is like a sudden emergence and gaining world-wide attention. The rapid progress of its technology, popularization and application of fast, rare in the history of communications technology. Fiber-optic communication with its large communication capacity, free from electromagnetic interference and save a lot of non-ferrous metals, etc., has been widely used in the city relay network applications. In the long-distance trunk communications network, also in the eve of practical, in addition to the United States is building will be built in 1985 from Boston to Washington about 1000 km long-distance trunk optical fiber communication system, the United Kingdom has announced since 1984