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本文从多模阶跃光纤的模式耦合和损耗来确定光接收机输入端的光脉冲波形,并以光源—光纤耦合系数和模式衰减系数作为信道参数,对光纤通信系统进行设计,由此确定接收机灵敏度和需要的接收机滤波器;利用损耗传递参量确定中继系统功率容限;用上升时间来描述光纤系统的带宽。数字计算的结果表明,对于低、中速率,短距离光纤系统,探测器接收的光脉冲波形可以用高斯脉冲波形来等效,从而简化系统的设计。
In this paper, the optical pulse waveform at the input end of an optical receiver is determined by the mode coupling and loss of multi-mode step-and-step optical fibers. The optical fiber communication system is designed by using the light source-fiber coupling coefficient and mode attenuation coefficient as channel parameters, Sensitivity and required receiver filter; Transmission loss parameters to determine the relay system power tolerance; Rise time to describe the bandwidth of the optical fiber system. The results of numerical calculations show that the optical pulse waveform received by the detector can be equivalent to the Gaussian pulse waveform for low, medium and short-range fiber systems, simplifying system design.