Patent ID: 7554720
Filing Date: 2009-06-30
Classification: H04B

Abstract:
1. A transmission apparatus for multiplexing and transmitting a plurality of signal lights, comprising: optical multiplexer for multiplexing wavelengths of the plurality of signal lights and outputting wavelength multiplexed signal lights; optical amplifier being connected at an output a latter stage of the optical multiplexer for operating in one of automatic gain control mode and automatic level control mode, the automatic gain control mode maintaining a constant gain for the wavelength-multiplexed signal lights, the automatic level control mode maintaining constant output power for the wavelength-multiplexed signal lights; and mode selecting means for selecting the one of the automatic gain control mode and the automatic level control mode for the optical amplifier based on total optical power of the plurality of signal lights before being subjected to the wavelength multiplexing of the optical multiplexer and optical power of the wavelength-multiplexed signal lights resulting from the multiplexing of the optical multiplexer.