光学纤维.第2-50部分:产品规格.B级单模光纤分规范

[中文适用范围]： IEC 60793的本部分适用于B、B、B、B2、B4、B5和B6类光纤。附件 I 中显示了一张说明 IEC 名称与 ITU-T 名称之间关系的地图。这些光纤用于或可合并在信息传输设备和光纤电缆中。这些纤维适用三种类型的要求： IEC 60793-2 中定义的一般要求；本标准涵盖的 B 类单模光纤共有的具体要求，并在第 5 章中给出；适用于各个光纤类别或特定应用的特殊要求，这些要求在附件 A 至 G 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。 [外文原描述]： IEC 60793-2-50:2015 is applicable to optical fibre categories B1.1, B1.2, B1.3, B2, B4, B5 and B6. A map illustrating the connection of IEC designations to ITU-T designations is shown in Annex I. 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 standard and which are given in Clause 5; - particular requirements applicable to individual fibre categories or specific applications, which are defined in Annexes A to G. 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. This fifth edition cancels and replaces the fourth edition, published in 2012. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: - aligns the requirements with the ITU-T Recommendations G.654 (2012-10) and G.657 (2012-10); - adds a new sub-category B1.2_d; - modifies B6 sub-categories in terms of attenuation and chromatic dispersion coefficient. Keywords: information transmission equipment, optical fibre cables