人类自从用了电磁波这一宇宙中最快的速度进行通信以后,现代信息技术不断地向前发展。现在信息中,我们需要越来越多的信息,这就需要把信息之路修得越多越宽。我们已经知道,电磁波的传播速度等于光速,实际上光也是一种电磁波,与微波相比,光的频率更高。用光来通信,这条“高速公路”比短波、微波的“公路”高出千百万倍。而光纤通信用的不是普通的 Since humans communicated with the fastest speed in the universe using electromagnetic waves, modern information technology has continued to advance. In the information, we need more and more information, which requires more and more information roads. We already know that the propagation speed of electromagnetic waves is equal to the speed of light. In fact, light is also an electromagnetic wave. Compared with microwaves, the frequency of light is higher. Using light to communicate, this “highway” is millions of times higher than short-wave, microwave “roads”. And optical fiber communication is not ordinary