七十年代初期,损耗达到每公里几分贝的光纤刚一出现,人们就指望通信技术发生一场革命。以每秒几千兆比特速率在几十公里光纤上传输信息的光纤系统的设想,在设计者的脑海中浮现。然而,不久人们就发现,损耗并不是唯一的障碍,光纤固有的某些脉冲展宽效 In the early 1970s, optical fibers with losses of a few decibels per kilometer had just arrived and people expected a revolution in communications technology. The idea of ​​an optical fiber system that transmits information over tens of kilometers of fiber at several gigabits per second has surfaced in the minds of designers. However, it was not long before people realized that loss was not the only obstacle. Some of the inherent impulse spreads