光纤.第1-44部分:测量方法和试验程序.截止波长

[中文适用范围]： 本部分IEC 60793为测量单模光纤的截止波长建立了统一要求，从而有助于商业目的的光纤和光缆的检查。 本文件给出了测量非缆化或缆化单模电信光纤的截止波长的方法。这些程序适用于所有B类和C类光纤类型。 有三种测量截止波长的部署方法： - 方法A：使用22米长的非缆化光纤样本测量光缆截止波长λcc； - 方法B：使用22米长的缆化光纤样本测量光缆截止波长λcc； - 方法C：使用2米长的非缆化光纤样本测量光纤截止波长λc。 所有方法都需要参考测量。有两种参考扫描技术，可以与所有方法一起使用： - 弯曲参考技术； - 使用A1类(OM1-OM5)多模光纤的多模参考技术。 [外文原描述]： IEC 60793-1-44:2023 CMV contains both the official standard and its commented version. The commented version provides you with a quick and easy way to compare all the changes between IEC 60793-1-44:2023 edition 3.0 and the previous IEC 60793-1-44:2011 edition 2.0. Furthermore, comments from IEC SC 86A experts are provided to explain the reasons of the most relevant changes, or to clarify any part of the content. IEC 60793-1-44:2023 establishes uniform requirements for measuring the cut-off wavelength of single-mode optical fibre, thereby assisting in the inspection of fibres and cables for commercial purposes. This document gives methods for measuring the cut-off wavelength for uncabled or cabled single mode telecom fibre. These procedures apply to all category B and C fibre types. There are three methods of deployment for measuring the cut-off wavelength: - method A: cable cut-off using uncabled fibre 22 m long sample, lcc; - method B: cable cut-off using cabled fibre 22 m long sample, lcc; - method C: fibre cut-off using uncabled fibre 2 m long sample, lc. All methods require a reference measurement. There are two reference-scan techniques, either or both of which can be used with all methods: - bend-reference technique; - multimode-reference technique using category A1(OM1-OM5) multimode fibre. This third edition cancels and replaces the second edition published in 2011. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) used the diameter of the fibre loops to describe deployment; b) added Annex D related to cut-off curve artifacts; c) reorganized information and added more figures to clarify concepts.