IEC 61300-3-20:2001
纤维光学互连器件和无源元件 基本试验和测量程序 第3-20部分:检查和测量 纤维光学分支器件的定向性
Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-20: Examinations and measurements; Directivity of fibre optic branching devices