论文部分内容阅读
光纤具有以前的传输介质所没有的低损耗、宽带宽、无感应、重量轻的优良特性,是经济地构成大容量传输线路或宽频带传输线路的新介质。从50年代开始,各研究所就进行了以光纤为传输介质的传输方法的研究,并实际应用于医用内窥镜。自1970年人们预测光纤可用于长距离通信以来,各国的研究机构和厂家都积极地进行了研究,随着理论研究和制造技术的提高,降低光纤损耗的工作进展很快。美国研制长距离通信用光纤主要是康宁公司和贝尔研究所等单位,日本主要是电电公社和藤仓电线,电电公社于1976年研制成光损耗为0.47dB/km的突变型光纤,1979年又研制成光损耗为
Optical fiber has the characteristics of low loss, wide bandwidth, non-sensing and light weight that the previous transmission media does not have, and is a new medium that economically constitutes a large-capacity transmission line or a broadband transmission line. Since the 1950s, various institutes have carried out research on transmission methods using optical fibers as transmission media, and have been practically used in medical endoscopes. Since 1970, people predicted that fiber can be used for long-distance communications. Research institutes and manufacturers in all countries have actively studied. With the improvement of theoretical research and manufacturing technology, the work of reducing fiber loss has progressed rapidly. The United States to develop long-distance communications with the optical fiber is mainly Corning and Bell Institute and other units, Japan is mainly electric commune and Fujikura wire, electrical commune in 1976 developed into a loss of 0.47dB / km sudden change in optical fiber, 1979 Years and developed into optical loss