IEC 60793-1-41:2024作为IEC 60793-1-41:2024 RLV提供，其中包含国际标准及其红线版本，显示了与上一版本相比技术内容的所有变化。IEC 60793-1-41:2024描述了确定和测量多模光纤模态带宽的三种方法（参见IEC 60793-2-10、IEC 60793-2-30和IEC 60793？2？40系列）。通过确定光纤对正弦调制光源的响应，在频域中直接测量基带频率响应。基带响应也可以通过观察窄光脉冲的展宽来测量。使用差分模式延迟(DMD)数据确定计算的响应。这三种方法是: 方法A-时域(脉冲失真)测量 方法B-频域测量 方法C-由差分模式延迟(OMBc)计算的过填充发射模式带宽 方法A和方法B可以使用两种启动中的一种来执行:过填充启动(OFL)条件或受限模式启动(RML)条件。方法C仅针对A1-OM3至A1-OM5多模光纤定义，并且使用DMD发射响应的加权求和，其中权重对应于过填充发射条件。根据纤维的类型选择相关的测试方法和发射条件。 注1？这些测试方法通常用于生产和研究设施中，并且不容易在现场完成。 注2？多年来，OFL一直用于基于LED的应用的模态带宽值。然而，没有单个发射条件代表激光器（例如。g.VCSEL)源，用于千兆位和更高速率的传输。这一事实推动了IEC 60793-1-49的发展，用于确定激光优化的50 μ m光纤的有效模态带宽。有关更多信息，请参见IEC 60793-2-10和IEC 61280-4-1。 第四版取消并取代了2010年出版的第三版。本版构成技术修订版。与上一版相比，此版本包括以下重大技术变更: a)添加方法A和方法B的直接参考。

IEC 60793-1-41:2024 is available as IEC 60793-1-41:2024 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC 60793-1-41:2024 describes three methods for determining and measuring the modal bandwidth of multimode optical fibres (see IEC 60793-2-10, IEC 60793-2-30, and the IEC 60793？2？40 series). The baseband frequency response is directly measured in the frequency domain by determining the fibre response to a sinusoidaly modulated light source. The baseband response can also be measured by observing the broadening of a narrow pulse of light. The calculated response is determined using differential mode delay (DMD) data. The three methods are:
Method A – Time domain (pulse distortion) measurement
Method B – Frequency-domain measurement
Method C – Overfilled launch modal bandwidth calculated from differential mode delay (OMBc)
Method A and method B can be performed using one of two launches: an overfilled launch (OFL) condition or a restricted mode launch (RML) condition. Method C is only defined for A1-OM3 to A1-OM5 multimode fibres and uses a weighted summation of DMD launch responses with the weights corresponding to an overfilled launch condition. The relevant test method and launch condition is chosen according to the type of fibre.
NOTE 1？These test methods are commonly used in production and research facilities and are not easily accomplished in the field.
NOTE 2？OFL has been used for the modal bandwidth value for LED-based applications for many years. However, no single launch condition is representative of the laser (e.g. VCSEL) sources that are used for gigabit and higher rate transmission. This fact drove the development of IEC 60793-1-49 for determining the effective modal bandwidth of laser optimized 50 μm fibres. See IEC 60793-2-10 and IEC 61280-4-1 for more information.
This fourth edition cancels and replaces the third edition published in 2010. 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 direct reference for method A and method B.