Method and apparatus for monitoring performance of optical transmission systems

摘要: In methods and apparatus for monitoring the performance of optical transmission systems, an signal is modulated with a low frequency dither to provide having known modulation depth. A portion tapped, both total power amplitude tapped are measured. Both noise components estimated by comparing measured power. wavelength division multiplexed signals at each distinct amplitudes detectable in wavelength. The relative powers wavelengths controlled response amplitudes. particularly applicable high capacity long haul terrestrial fiber systems using amplifiers.