光纤 产品规范.B类单模光纤分规范

[中文适用范围]： 本部分IEC 60793适用于光纤类别B-652、B-653、B-654、B-655、B-656和B-657。这些光纤用于或可以并入信息传输设备和光缆中。对这些光纤适用三类要求：IEC 60793-2中定义的一般要求；本文件涵盖的B类单模光纤的通用特定要求；适用于个别光纤类别或特定应用的特定要求。 [外文原描述]： IEC 60793-2-50:2025 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 4; - particular requirements applicable to individual fibre categories or specific applications, which are defined in Annex A to Annex 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. Table 1 shows a map from the IEC designations to the ITU-T recommendations. This seventh edition cancels and replaces the sixth edition published in 2018. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition. a) The addition of a 200 µm coating nominal outer diameter option for B-654A, B, C fibres in Annex C