This part of IEC 61280 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 o different spectral types， such as continuous spectra characteristics of light-emitting diodes (LEDs)， es well es multilongitudinal-mode (MLM)， multitransverse-mode (MTM) and single-longitudinal mode (SLM) spectra, which are characteristic of laser diodes (LDs).
