光纤.第1-41部分:测量方法和试验规程.频带宽度

[中文适用范围]： IEC 60793 的这一部分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 60793-30 系列和 IEC 60793-40 系列）。通过确定光纤对正弦调制光源的响应，可以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。计算出的响应是使用差模延迟 (DMD) 数据确定的。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 – 根据差模延迟 (OMBc) 计算的过满启动模态带宽 方法 A 和 B 可以使用以下两种启动之一来执行：过满启动 (OFL) 条件或限制模式启动 (RML) 条件。方法 C 仅针对 A1a.2（和准备中的 A1a.3）多模光纤定义，并使用 DMD 启动响应的加权求和，权重对应于溢出启动条件。应根据光纤类型选择相关的测试方法和发射条件。 [外文原描述]： IEC 60793-1-41:2010 describes three methods for determining and measuring the modal bandwidth of multimode optical fibres (see IEC 60793-2-10, IEC 60793-30 series and IEC 60793-40 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). The main change with respect to the previous edition is the addition of a third method for determining modal bandwidth based on DMD data and to improve measurement procedures for A4 fibres. This standard should be read in conjunction with IEC 60793-1-1 and IEC 60793-1-2, which cover generic specifications.