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光通信从研究以来的十多年中,适用领域正在逐步扩大,并已作为社会的技术被确立了下来。今后使现有的光纤降低损耗,向长距离、低成本化的方向发展。同时通过外差相干型、光子计数通信方式等的实用化来揭开第二代光通信的研究。光通信领域的扩大十五年后就要进入二十一世纪的今天,作为光通信这个词也好,或者就光通信本身讲也好,都好似人们所非常熟悉和非常关心地那样。其标志之一是从北海道至九洲纵贯日本的光通信线路(全长3400公里),在今年开始已提供了使用。为此,可以说,光通信已和人们的日常生活结下了姻缘。在二十年前,如果说光通信还是“渺茫的未来技术”的话,那么在今天它所显示出来的渺茫迹象却一点也没有了。
Over the past decade or so in optical communications, the field of application has been gradually expanded and has been established as a social technology. In the future, the existing optical fiber will be reduced in loss and will be developed in the direction of long distance and low cost. At the same time, the research of the second generation optical communication is revealed through the practical application of heterodyne coherence and photon counting communication. Today, just 15 years after its expansion in the field of optical communications, it is about to enter the 21st century. It is as good as optical communication or as optical communication itself, as if people are very familiar and very concerned about it. One of its hallmarks is the optical communication line (3,400 km in length) running through Japan from Hokkaido to Jiuzhou and has been in use since the beginning of this year. For this reason, it can be said that optical communications have already formed a marriage with people’s daily lives. Twenty years ago, if the optical communications were still “slim technologies of the future”, then the slightest sign it displayed today is nothing.