GB/T 18311.20-2007
纤维光学互连器件和无源器件 基本试验和测量程序 第3-20部分:检查和测量 纤维光学分路器件的方向性
Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 3-20: Examinations and measurements irectivity of fibre optic branching devices
GBT18311.20-2007, GB18311.20-2007