Patent ID: 7809263
Filing Date: 2010-10-05
Classification: H04B

Abstract:
1. An optical transmission apparatus for outputting wavelength-division multiplexed signal lights to a next section of an optical transmission path, comprising: a light receiver which receives the wavelength-division multiplexed signal lights together with a supervisory signal light, the wavelength-division multiplexed signal lights and supervisory signal light having been transmitted through a previous section of the optical transmission path, separates the supervisory signal light from the received wavelength-division multiplexed signal lights, and detects power of the received supervisory signal light; a gain control type optical amplifier which amplifies the wavelength-division multiplexed signal lights; a light transmitter which transmits to the next section of the optical transmission path a supervisory signal light for the next section, and a controller which controls power of the supervisory signal light for the next section to be transmitted from the light transmitter, based on a change of the power of the received supervisory signal light.