step index fiber meaning in English

阶梯折射率纤维
阶跃折射率光纤
突变折射率型光纤

Step index fiber optic cable
步进指数纤维光电缆
Step index fibers
步进指数纤维
Because of the digitally rebalanced circuit , the sensor is capable of achieving better static and dynamic characteristic , higher sensitivity and stability . in this paper , the propagation path of light in the step index fiber and graded index fiber is introduced firstly . then the paper sets up the coupled power model and develops the coupling function
在文中，首先介绍了光线在阶跃型光纤和梯度折射型光纤中的传播路径，以及在一端镀有反射膜的1 4波节长度的grin透镜中的成像规律，并推导了光功率耦合函数。