纤维光学通信子系统基本试验程序.第4-4部分:已安装链路的偏振模式色散测量

[中文适用范围]： IEC 61280 的这一部分提供了测量单模安装链路的偏振模式色散 (PMD) 的统一方法。安装的链路是发送器和接收器之间的光路，或者该光路的一部分。这些测量可用于评估给定链路对于高比特率应用的适用性，或提供对各种相关传输属性关系的洞察。本文件重点介绍了测量长距离已安装布线的测量方法和要求，这些布线还可以包括其他光学元件，例如接头、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、复用器、波长选择开关、可重新配置光分插复用器（ROADMS）。本文件重点介绍完成测量所需的设备、程序和计算。 IEC TR 61282-9 解释了测试方法背后的理论。 [外文原描述]： IEC 61280-4-4:2017 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.