光纤 - 第2-50部分:产品规格 - B类单模光纤的规格

[中文适用范围]： IEC 60793的本部分适用于光纤类别B-652@ B-653@ B-654@ B-655@ B-656和B-657。表 1 中显示了说明 IEC 名称与 ITU-T 名称之间关系的映射。这些光纤用于或可以合并在信息传输设备和光缆中。这些纤维适用三种类型的要求： ? IEC 60793-2 中定义的一般要求@； ？本文件中涵盖的 B 类单模光纤共有的具体要求，并在第 5 条中给出； ？适用于各个光纤类别或特定应用@的特殊要求，在附件A至F中定义。对于某些光纤类别（在相关系列规范中所示）@，存在根据传输属性规范差异进行区分的子类别。这些子类别的名称记录在各个系列规范中。表 1 显示了从 IEC 名称到 ITU-T 建议的映射。该表还提供了本文件中的规范性附录，其中包含详细规范以及 IEC 60793-2-50:2015 中用于描述该光纤类型的名称。给出了 ITU-T 建议以及每项建议中的 IEC 类别/子类别。在某些情况下，对于 G.652 建议书，给定的 IEC 名称映射到 ITU-T 中的多个类别，因为 ITU-T 类别是通过成缆光纤属性 (PMDQ) 性能来区分的，而 IEC 光纤规范中并未区分这些性能。 [外文原描述]： IEC 60793-2-50: 2018 is applicable to optical fibre categories B-652, B-653, B-654, B-655, B 656 and B-657. A map illustrating the connection of IEC designations to ITU-T designations is shown in Table 1. These fibres are used or can be incorporated in information transmission equipment and optical fibre cables. Three types of requirements apply to these fibres: • general requirements, as defined in IEC 60793-2; • specific requirements common to the class B single-mode fibres covered in this document and which are given in Clause 5; • particular requirements applicable to individual fibre categories or specific applications, which are defined in Annexes A to F. For some fibre categories (shown in the relevant family specifications), there are sub-categories that are distinguished on the basis of difference in transmission attribute specifications. The designations for these sub-categories are documented in the individual family specifications. The sixth edition cancels and replaces the fifth edition published in 2015. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) Introduction of a revised naming convention which better matches with those found in ITU T Recommendations G.652, G.653, G.654, G.655, G.656, and G.657. These changes are outlined in the scope of this document along with a cross reference table for the new names. Annexes have been rearranged to improve clarity based on the new naming; b) Further details on the requirements for 200 micron coated single-mode fibre; c) Harmonization with the following ITU-T Recommendations published in November 2016: G.652, G.654, G.657 including revised chromatic dispersion specifications, new categories and new application spaces for these fibre categories; d) Descriptions of fibre types have been added to the titles of Annexes A to F. Keywords: information transmission equipment, optical fibre cables