前言光纤传输系统由产生光脉冲序列的发射机(使用激光器或发光二极管)、传送这些脉冲串的光纤和检测这些脉冲信号的接收机组成。系统的主要参数是发送的脉冲形状、峰值功率、比特结构和比特率、光纤的损耗和带宽、接收机电子电路的带宽及噪声等。各种噪声源主要分布在接收机中。因此,接收机必须有一定的最小光功率输入,才能较满意地将信息脉 Introduction Optical fiber transmission systems consist of transmitters (using lasers or light-emitting diodes) that generate optical pulse trains, optical fibers that transmit these bursts, and receivers that detect these pulsed signals. The main parameters of the system are the transmitted pulse shape, peak power, bit structure and bit rate, optical fiber loss and bandwidth, receiver electronics bandwidth and noise. Various noise sources are mainly distributed in the receiver. Therefore, the receiver must have a certain minimum optical power input, in order to more satisfactory information pulse