Optical transmission monitoring apparatus, optical transmission monitoring method, optical amplification system, method of controlling optical amplification system, and optical transmission system
AssigneeSumitomo Electric Industries, Ltd.
InventorKoji Nakazato
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Abstract
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 of the variations in optical power in the optical transmission path.
Claims23
An optical transmission monitoring apparatus for monitoring at least a transmission state in an optical transmission path through which light belonging in a signal wavelength band and containing one or more light signals having different wavelengths propagates, comprising:
- a first detector for detecting at least one of optical power of one or more monitoring light signals of light in a first wavelength band and optical power of noise of the light in said first wavelength band, in a monitor wavelength band in which light propagating through said optical transmission path and containing said one or more monitoring light signals having different wavelengths belongs;
- a second detector for detecting at least one of optical power of one or more monitoring light signals of light in a second wavelength band included in said monitor wavelength band and optical power of noise of light in said second wavelength band;
- and
- a monitoring section for comparing a variation amount of optical power per unit time in said first wavelength band, detected by said first detector, with a variation amount of optical power per unit time in said second wavelength band, detected by said second detector, and identifying a cause of a variation of optical power in said optical transmission path on the basis of the comparison result.
An optical transmission monitoring method of monitoring at least a transmission state in an optical transmission path through which light belongs in a signal wavelength band and containing one or more light signals having different wavelength spropagates, comprising the step of:
- detecting at least optical power of one or more monitoring light signals in a first wavelength band included in a monitor wavelength band in which light propagating through said optical transmission path and containing said one or more monitoring light signals having different wavelengths belongs, and optical power of noise of the light in said first wavelength band;
- detecting at least one of optical power of one or more monitoring light signals in a second wavelength band included in said monitor wavelength band and optical power of noise of the light in said second wavelength band;
- comparing a variation amount of the detected optical power per unit time in said first wavelength band with a variation amount of the detected optical power per unit time in said second wavelength band;
- and
- identifying a cause of a variation in optical power in said optical transmission path.
Dependencies are inferred from the claim text.