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.
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。
2
A sensor head for hybrid optical current transformer (HOCT) is designed, the error resource of it is analyzed, and the overcoming method is given.
设计了一种用于混合式光电电流互感器(HOCT)的电流传感头。分析了其测量误差，给出解决的方法。
3
Then, the error produced by sphericity error, material refractive rate error and optical center error of cat eye are discussed.