光纤互连设备和无源组件 - 增强型宏弯多模光纤的光纤连接器光学接口 - 第3-61部分：50μm纤芯直径物理接触光纤的连接器参数 - 用于参考连接应用的非倾斜2.5mm和1.25mm直径全氧化锆圆柱形套圈

[中文适用范围]： IEC 63267-3-61:2025规定了用于参考连接器的光学接口的尺寸限制，这些连接器采用直径为2.5 mm或1.25 mm的圆柱形氧化锆（ZrO2）套管，以满足IEC 63267-2-2中定义的非角抛光多模参考连接的光纤到光纤互连的特定要求。套管的尺寸和特性包含在光纤光缆连接器接口标准IEC 61754系列中。本文档中定义了一种参考连接器等级Rm1。该参考连接器仅在850 nm波段使用A1-OM2b至A1-OM5b光纤，并终止于受限的IEC 60793-2-10标准。所规定的参考连接器的几何尺寸和公差主要是为了限制多个参考连接器组之间测量衰减的差异，从而减少任意选择的参考连接器与现场或工厂中连接器对接时测量衰减的差异。本版及IEC 63267-2-2首版取代了2018年发布的IEC 61755-6-2首版。本版为技术修订版。与上一版相比，本文档包括以下重大技术更改：a) 定义参考等级Rm1接口；b) 包含A1-OM2b至A1-OM5b光纤；c) 规范性引用的更新；d) 增加附录A，描述参考等级Rm1连接器与Bm等级连接器的衰减测试限制；e) 新增附录B，描述允许的光纤下切。 [外文原描述]： IEC 63267-3-61: 2025 defines the dimensional limits of an optical interface for reference connectors with 2,5 mm or 1,25 mm diameter cylindrical zirconia (ZrO2) ferrules necessary to meet specific requirements for fibre-to-fibre interconnection of non-angled polished multimode reference connections as defined in IEC 63267-2-2. Ferrule dimensions and features are contained in the IEC 61754 series of fibre optic connector interface standards. One grade of reference connector, Rm1, is defined in this document. The reference connector is terminated to restricted IEC 60793-2-10 using A1-OM2b to A1‑OM5b fibre in 850 nm band only. The geometrical dimensions and tolerances of the specified reference connector have been developed primarily to limit the variation in measured attenuation between multiple sets of reference connectors, and therefore to reduce the variation in measured attenuation between an arbitrarily chosen reference connector when mated with a connector in the field or factory. This first edition and the first edition of IEC 63267-2-2 cancel and replace the first edition of IEC 61755-6-2 published in 2018. This edition constitutes a technical revision. The document includes the following significant technical changes with respect to the previous edition: a) Definition of a reference grade, Rm1 interface; b) Inclusion of A1-OM2b to A1-OM5b fibres; c) Updates to normative references; d) The addition of Annex A, which describes the attenuation test limits of reference grade Rm1 connectors to grade Bm connectors; e) A new Annex B that describes the allowable fibre undercut.