光纤第1-47部分:测量方法和试验程序宏观弯曲损耗

[中文适用范围]： 本部分IEC 60793建立了测量单模光纤（B类）在1550 nm或1625 nm、A1类多模光纤在850 nm或1300 nm、A3和A4类多模光纤在650 nm、850 nm或1300 nm时的宏弯损耗的统一要求，从而有助于商业用途的光纤和光缆的检查。 本文件给出了两种测量宏弯灵敏度的方法： 方法A - 光纤缠绕，适用于B类单模光纤和A1类多模光纤。方法B - 四分之一圆弧弯曲，适用于A3和A4类多模光纤。 对于这两种方法，宏弯损耗可以通过一般的纤维衰减技术进行测量，例如功率监测技术（见附录A）或切断技术（见附录B）。如果应用于同一光纤，方法A和方法B预计会产生不同的结果。这是因为两种方法之间的关键区别在于部署方式，包括弯曲半径和弯曲光纤的长度。差异的原因是A3和A4类多模光纤预计在较短长度上部署，单位光纤长度的弯曲次数较少，与单模和A1类多模光纤相比。 在本文件中，“曲率半径”被定义为适合圆形支撑（例如心轴或平面上的引导槽）的半径，光纤可以在其上弯曲。 此外，信息性附录E已添加，用于近似B类单模光纤在各种有效弯曲下的宽波长范围内的弯曲损耗。 [外文原描述]： IEC 60793-1-47:2017 establishes uniform requirements for measuring the macrobending loss of single-mode fibres (class B) at 1 550 nm or 1 625 nm, category A1 multimode fibres at 850 nm or 1 300 nm, and category A3 and A4 multimode fibres at 650 nm, 850 nm or 1 300 nm, thereby assisting in the inspection of fibres and cables for commercial purposes. This document gives two methods for measuring macrobending sensitivity: - Method A – Fibre winding, pertains to class B single-mode fibres and category A1 multimode fibres. - Method B – Quarter circle bends, pertains to category A3 and A4 multimode fibres. For both of these methods, the macrobending loss can be measured utilizing general fibre attenuation techniques, for example the power monitoring technique (see Annex A) or the cut‑back technique (see Annex B). Methods A and B are expected to produce different results if they are applied to the same fibre. This is because the key difference between the two methods is the deployment, including the bend radius and length of fibre that is bent. The reason for the difference is that A3 and A4 multimode fibres are expected to be deployed in short lengths with a smaller number of bends per unit fiber length compared to single-mode and category A1 multimode fibres. In this document, the "curvature radius" is defined as the radius of the suitable circular shaped support (e.g. mandrel or guiding groove on a flat surface) on which the fibre can be bent. In addition, informative Annex E has been added to approximate bend loss for class B single-mode fibres across a broad wavelength range at various effective bends. This fourth edition cancels and replaces the third edition published in 2009. It constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: - former Annex A has been renumbered to Annex D; - introduction of new Annex A on the transmitted power monitoring technique; - introduction of Annex B on the cut-back technique; - introduction of Annex C on the requirements for the optical source characteristics of A1 multimode measurement; - introduction of Annex E on parallel plate (2-point) macrobend loss approximation. Keywords: macrobending loss of single-mode fibers