Optical wavelength multiplexing transmission apparatus and optical wavelength multiplexing transmission method

An optical wavelength multiplexing transmission method comprising:

• demultiplexing a multiplexed signal including a plurality of optical wavelength multiplexed signals having individual optical wavelength bands into an optical wavelength multiplexed signal for each of the optical wavelength bands;
• detecting a power value of each of the optical wavelength multiplexed signals for each of the optical wavelength bands;
• compensating for a tilt in the optical wavelength multiplexed signal based on the power value for each of the optical wavelength bands;
• compensating for a power of the optical wavelength multiplexed signal for each of the optical wavelength bands so as to reduce a power difference among optical wavelength multiplexed signals after the tilt compensation based on the power value for each of the optical wavelength bands;
• and
• multiplexing each of the optical wavelength multiplexed signals after the power compensation and outputting a multiplexed signal.

An optical wavelength multiplexing transmission apparatus comprising:

• a demultiplexer configured to demultiplex a multiplexed signal including a first optical wavelength multiplexed signal having a first optical wavelength band and a second optical wavelength multiplexed signal having a second optical wavelength band into the first optical wavelength multiplexed signal and the second optical wavelength multiplexed signal;
• a first detector configured to detect a first power value of the first optical wavelength multiplexed signal;
• a second detector configured to detect a second power value of the second optical wavelength multiplexed signal;
• a first tilt compensator configured to compensate for a tilt in the first optical wavelength multiplexed signal based on the first power value and the second power value;
• a second tilt compensator configured to compensate for a tilt in the second optical wavelength multiplexed signal based on the first power value and the second power value;
• a first power compensator configured to compensate for a power of the first optical wavelength multiplexed signal so as to reduce a power difference between the first optical wavelength multiplexed signal after the tilt compensation and the second optical wavelength multiplexed signal after the tilt compensation based on the second power value;
• a second power compensator configured to compensate for a power of the second optical wavelength multiplexed signal so as to reduce a power difference between the first optical wavelength multiplexed signal after the tilt compensation and the second optical wavelength multiplexed signal after the tilt compensation based on the first power value;
• and
• a multiplexer configured to multiplex the first optical wavelength multiplexed signal after the power compensation and the second optical wavelength multiplexed signal after the power compensation and output a multiplexed signal.