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光纤的色散在光通信中,作为光信号传输介质的光纤,其传输特性主要有两点:一是光纤的损耗,一是光纤的带宽。关于光纤的损耗,前面已作了介绍。而光纤的带宽,是由光纤的色散性质(Dispersion Properties of Fibers)所决定的。当通过光纤传送光脉冲信号时,一方面由于光纤损耗的存在,将使光脉冲的幅度减小,而另一方面,由于光纤带宽的限制,或者说由于光纤色散的结果,将使得光脉冲的波形产生失真、畸变,使光脉冲的宽度变宽(当然,其幅度也相应下降),如图1所示。光纤越长,由于损耗而使得光脉冲的幅度减小就越厉害,同时,由于色散而使光脉冲的变宽也越严重。由于接收端总有一定的噪声,光脉冲的
Dispersion of optical fiber In optical communication, optical fiber as the optical signal transmission medium, the transmission characteristics of two main points: First, the loss of optical fiber, and first optical fiber bandwidth. On the loss of optical fiber, the front has been introduced. The bandwidth of an optical fiber is determined by the Dispersion Properties of Fibers. When the optical pulse signal is transmitted through the optical fiber, the amplitude of the optical pulse will be reduced on the one hand due to the loss of the optical fiber. On the other hand, due to the limitation of the optical fiber bandwidth or the dispersion of the optical fiber, Waveform distortion, distortion, widening the width of the light pulse (of course, its amplitude also decreased), as shown in Figure 1. The longer the optical fiber, the more the optical pulse is reduced in magnitude due to the loss, and the more severe the optical pulse is broadened due to dispersion. Due to the receiver there is always some noise, light pulse