Patent ID: 6599039
Filing Date: 2003-07-29
Classification: H04B,H04W

Abstract:
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.