Patent ID: 9667346
Date: 2017-05-30
CPC Classifications: H04B,H04J

Claim:
1. An optical transmission system comprising: an optical transmission node configured to transmit wavelength-multiplexed light of a plurality of wavelengths arranged in a predetermined transmission band; and an optical reception node configured to receive the wavelength-multiplexed light, and to include a monitor configured to monitor a detection sensitivity indicating a sampling phase shift with respect to a phase of light corresponding to one among the plurality of wavelengths in the received wavelength-multiplexed light, and a transmitter configured to transmit information indicating that the detection sensitivity monitored by the monitor for light corresponding to a first wavelength adjacent to a first outer edge of the transmission band, among the plurality of wavelengths, has been reduced below a first threshold value, to the optical transmission node, wherein the optical transmission node includes a receiver configured to receive information indicating a reduction in the detection sensitivity, and a controller configured to stop wavelength control of shifting the first wavelength adjacent to the first outer edge in a direction approaching the first outer edge in response to reception of the information.