光纤 - 第2部分:产品规格 - 一般

[中文适用范围]： IEC 60793-2 包含多模和单模光纤的一般规范。四种多模光纤类别（A1、A2、A3 和 A4）的 sectional 规范包含针对每个类别的具体要求。三个单模光纤类别（B、C 和 D）的 sectional 规范包含每类光纤的共同要求。每个 sectional 规范包括包含适用于该类别或子类别要求的家庭规范（在规范性附录中）。这些子类别基于不同的光纤类型或应用进行区分。本文档的要求适用于所有类别。每个 sectional 规范包含属于其内的所有家庭规范要求的共同要求。这些共同要求被复制到家庭规范中以便于参考。为每个指定的属性定义了测试或测量方法。在可能的情况下，这些定义通过引用 IEC 国际标准（见 IEC 60793-1 系列）来定义——否则测试或测量方法在相关的 sectional 规范中概述。表 1 定义了 sectional 规范。相关的家庭规范在 sectional 规范内定义为规范性附录（见表 2 至表 5）。附录 A 和 B 总结了现有光纤规范。 [外文原描述]： IEC 60793-2:2019 contains the general specifications for both multimode and single-mode optical fibres. Sectional specifications for each of the four categories of multimode fibres: A1, A2, A3, and A4 (part of the multimode fibre class A) contain requirements specific to each category. Sectional specifications for each of the three single-mode fibre classes, B, C and D contain requirements common to each class. Each sectional specification includes family specifications (in normative annexes) that contain requirements for the applicable category or sub-categories. These sub-categories are distinguished on the basis of different fibre types or applications. The requirements of this document apply to all classes. Each sectional specification contains the requirements that are common to all the family specifications that are within it. These common requirements are copied to the family specification for ease of reference. Tests or measurement methods are defined for each specified attribute. Where possible, these definitions are by reference to an IEC International Standard (see IEC 60793-1 series) – otherwise the test or measurement method is outlined in the relevant sectional specification. This ninth edition cancels and replaces the eighth edition published in 2015. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: - introduction of the revised fibre designations for most A1 sub-category fibres and all class B single-mode fibres; - addition of the new fibre model (A1-OM5) defined for A1 category; - addition of class D polarization maintaining fibres. Keywords: specifications for both multimode and single-mode optical fibres