GB/T 18311.20-2007
纖維光學互連器件和無源器件 基本試驗和測量程序 第3-20部分:檢查和測量 纖維光學分路器件的方向性
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