论文部分内容阅读
绪言对高效率的通信系统特别是对适用于电视、电话、计算机和传真等类系统的需求日趋迫切。研制这些通信系统最理想的是结合现在光纤通信所提供的新器件和新技术。既能增加每个信道的信息带宽,又可降低成本。光纤传输的一些优点如下: [1]在光缆制造水平低下时光缆的成本约和同轴电缆的成本相同。但在大量生产时,光缆的成本将大大降低并实际上与金属材料的成本无关。
INTRODUCTION The need for efficient communication systems, especially for systems such as televisions, telephones, computers and facsimiles, is becoming more pressing. The best part of developing these communications systems is the combination of new devices and technologies that are available today with fiber optic communications. Not only can increase the information bandwidth of each channel, but also reduce the cost. Some of the advantages of optical fiber transmission are as follows: [1] The cost of a fiber optic cable is about the same as that of a coaxial cable when the level of fiber optic cable manufacturing is low. However, in mass production, the cost of fiber optic cable will be significantly reduced and virtually independent of the cost of the metal material.