Patent ID: 8306427
Filing Date: 2012-11-06
Classification: H04B,H04J

Abstract:
1. A WDM transmission apparatus comprising: a calculator being operable to calculate optical signal levels of wavelengths, respectively, that have been demultiplexed from a wavelength division multiplexed (WDM) light; an amplifier controller being operable, after the wavelengths that have been demultiplexed are wavelength division multiplexed together, to control an optical amplifier that amplifies the optical signal levels of the wavelengths after being wavelength division multiplexed together to compensate for the optical signal levels of the wavelengths to become a target level based on the optical signal levels calculated by the calculator; and a deviation corrector being operable to correct deviations of optical signal levels between the wavelengths based on the optical signal levels calculated by the calculator, wherein the calculator calculates the optical signal levels based on power levels of the wavelengths after being demultiplexed from the WDM light and before being wavelength division multiplexed together and based on optical-signal-to-noise ratios (OSNRs).