IEC 61280-4-4:20 17(E)提供了测量单模安装链路的偏振模色散(PMD)的统一方法。安装的链路是发射机和接收机之间的光路，或该光路的一部分。这些测量可以用于评估给定链路对于高比特率应用的适用性，或者提供关于各种相关传输属性的关系的洞察。本文档重点介绍了测量长长度已安装电缆的测量方法和要求，这些电缆还可以包括其他光学元件，如接头、连接器、放大器、色散补偿模块、密集波分复用或多路复用器（DWDM）组件、多路复用器、波长选择开关、可重新配置的光分插复用器（ROADMS）。本文档重点介绍完成测量所需的仪器、程序和计算。IEC TR 61282-9解释了测试方法背后的理论。这第二版取消并取代了2006年出版的第一版。这第二版构成技术修订。与上一版相比，此版本包括以下重大技术变更: -移除理论并替换为参考IEC TR 61282-9； -增加了一种新方法，波长扫描OTDR和SOP分析（WSOSA），作为附录G； -每种方法的简要描述被添加到条款5中； -将方法E和F转换为资料性附件E和F； -增加了关于测量配置的新条款（6）； -新增有关量度考虑的第(7)条； -扩大了关于程序的第10条；-改进了几个设备图； -附件H对测量和计算的内容作了一些澄清。 关键词:偏振模色散（PMD），单模安装链路

IEC 61280-4-4:2017(E) provides uniform methods of measuring polarization mode dispersion (PMD) of single-mode installed links. An installed link is the optical path between transmitter and receiver, or a portion of that optical path. These measurements can be used to assess the suitability of a given link for high bit rate applications, or to provide insight on the relationships of various related transmission attributes. This document focuses on the measurement methods and requirements for measuring long lengths of installed cabling that can also include other optical elements, such as splices, connectors, amplifiers, chromatic dispersion compensating modules, dense wavelength division multiplexing or multiplexer (DWDM) components, multiplexers, wavelength selective switches, re-configurable optical add drop multiplexer (ROADMS). This document focuses on the apparatus, procedures, and calculations needed to complete measurements. IEC TR 61282-9 explains the theory behind the test methods. This second edition cancels and replaces the first edition published in 2006. This second edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- theory is removed and replaced with a reference to IEC TR 61282-9;
- a new method, wavelength scanning OTDR and SOP analysis (WSOSA), is added as Annex G;
- a brief description of each method is added to Clause 5;
- Methods E and F are converted to informative Annexes E and F;
- a new Clause (6) on measurement configurations is added;
- a new Clause (7) on measurement considerations is added;
- Clause 10 on procedure is expanded;
- several of the apparatus diagrams are improved;
- several clarifications about what is measured and what is calculated have been made in Annex H.

Keywords: Polarization mode dispersion (PMD), single-mode installed links