IEC 61280-1-3:20 21作为IEC 61280-1-3:20 21 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 61280-1-3:20 21提供了与光纤通信子系统、光发射器或在通信子系统的操作或测试中使用的其他光源相关联的光谱的几个波长和光谱宽度属性的定义和测量程序。该文件还提供了边模抑制比和信号源自发辐射比的定义和测量程序。进行测量是为了系统构造和/或维护的目的。在通信子系统信号的情况下，光发射机通常处于调制状态。注意不同的性质可以适用于不同的光谱类型，例如发光二极管(LED)的连续光谱特性，以及激光二极管(LD)的特征的多纵模(MLM)、多横模(MTM)和单纵模(SLM)光谱。这第三版取消并取代了2010年出版的第二版。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: -在8.9中增加了信号与源自发辐射比的测量； -更改文件标题以反映额外测量； -关于在8.8中测量侧模抑制比时使用的分辨率带宽的附加信息； -使用校准的光学波长计来精确测量单纵模激光器的波长。

IEC 61280-1-3:2021 is available as IEC 61280-1-3:2021 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC 61280-1-3:2021 provides definitions and measurement procedures for several wavelength and spectral width properties of an optical spectrum associated with a fibre optic communication subsystem, an optical transmitter, or other light sources used in the operation or test of communication subsystems. This document also provides definitions and measurement procedures for side-mode suppression ratio and signal-to-source spontaneous emission ratio. The measurement is done for the purpose of system construction and/or maintenance. In the case of communication subsystem signals, the optical transmitter is typically under modulation. NOTE Different properties can be appropriate to different spectral types, such as continuous spectra characteristics of light-emitting diodes (LEDs), as well as multilongitudinal-mode (MLM), multitransverse-mode (MTM) and single-longitudinal mode (SLM) spectra, which are characteristic of laser diodes (LDs). This third edition cancels and replaces the second edition published in 2010. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- addition of measurement of signal-to-source spontaneous emission ratio in 8.9;
- change of document title to reflect the additional measurement;
- additional information on the resolution bandwidth used in the measurement of the side-mode suppression ratio in 8.8;
- use of a calibrated optical wavelength meter for accurate wavelength measurements of single-longitudinal mode lasers.