纤维光学互连器件和无源器件 基本试验和测量程序 第3-3部分:检查和测量 监测衰减和回波损耗变化（多路）

Fibre optic interconnecting devices and passive components--Basic test and measurement procedures--Part 3-3:Examinations andmeasurements--Monitoring change in attenuation and in return loss (multiple paths)