纤维光学互连器件和无源元件 基本试验和测量程序 第3-9部分:检查和测量 远端串音

[中文适用范围]： IEC 1300 的这一部分描述了测量多端口 MxN 或 1xN 光纤无源组件（交换机、WDM 或在特定情况下扇出）的通道之间的远端光串扰的程序。远端串扰定义为从给定输出端口发出的光功率与从另一个输出端口发出的光功率之比，该输出端口名义上与前一个输出端口隔离。对于WDM，在两个输出路径中传播的信号具有不同的波长，远端串扰对应于给定波长下从相应输出端口发出的光功率与相同波长下的光功率的比率，从另一个输出端口发出，名义上与该波长的前一个输出端口隔离。对于 WDM 组件，术语隔离比远端串扰更常用。 [外文原描述]： IEC 61300-3-9:1997 describes the procedure to measure the far-end crosstalk of light between channels of a multiport MxN or 1xN fibre optic passive components (switch, WDM or, in particular cases, fan-out). The far-end crosstalk is defined as the ratio of the optical power that goes out from a given output port to an optical power that goes out from another output port, nominally isolated from the previous one. For WDMs the signal travelling in the two output paths have different wavelengths and the far-end crosstalk corresponds to the ratio of the optical power, at a given wavelength, that goes out from the corresponding output port to an optical power, at the same wavelength, that goes out from another output port, nominally isolated from the previous one at that wavelength. For WDM components the term isolation is more commonly used than far-end crosstalk.