纤维光学互连器件和无源元件 基本试验和测量程序 第3-19部分:检验和测量 单模纤维光学器件回波损耗偏振依赖性

[中文适用范围]： IEC 1300 的这一部分描述了确定单模光纤元件的回波损耗对穿过该元件的光的偏振态 (SOP) 的依赖性的测试。回波损耗是光纤链路或系统的总反射功率与入射功率之比的绝对值（以分贝为单位）。由于组件中光的 SOP 通常是不确定的，并且实际上经常随着时间而变化，因此表现出偏振依赖性的组件在系统中将具有不同的回波损耗。此过程可应用于任何单模无源组件和互连设备，包括衰减器、隔离器、分支设备、开关、连接器和接头（如果适用）。 [外文原描述]： IEC 61300-3-19:1997 describes the test to determine the dependence of return loss of a singlemode fibre optic component on the state of polarization (SOP) of the light passing through the component. Return loss is the absolute value of the ratio in decibels of the total reflected power to the incident power from an optical fibre link or system. Since the SOP of light in a component is generally indeterminate and in fact often changing as a function of time, a component that exhibits polarization dependence will have varying return loss in a system. This procedure can be applied to any singlemode passive component and interconnecting device, including attenuators, isolators, branching devices, switches, connectors, and splices, if applicable.