本文阐述光纤数字通信中部分响应信号的特点，和适当地设置信号电平使平均误码率达到最小的方法。
This paper describes the signal characteristic in optical fiber communication systems, and the way to set the signal levels appropriately for the minimum average error rate.
研究了利用频谱仪射频衰减、分辨带宽、视频带宽和视频平均的方法，提高和改善低电平信号的测量精度。
Improving measurement accuracy of low level signal is studied using RF attenuation, resolution bandwidth, video bandwidth, and video average.
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