Method and apparatus for optical communication monitoring, optical amplifier system, method of controlling optical amplifier system, and optical communication system

摘要

This invention relates to an optical transmission monitoring apparatus or the like which has a simple structure for identifying causes of variations in the power of WDM signals. The optical transmission monitoring apparatus includes a monitoring section for setting first and second wavelength bands in a monitor wavelength band, comparing variations in the optical powers of a plurality of types of light containing different light signals which are detected from the respective wavelength bands, and identifying causes o the variations in optical power in the optical transmission path.