Optical transmitter and optical transmission method

An optical transmission method performed by an optical transmitter, the optical transmission method comprising:

• outputting, out of an optical signal in which an optical path signal and an optical packet signal are mixed, a dummy signal having a wavelength identical to a wavelength of the optical packet signal by a source of the optical transmitter;
• multiplexing, by a multiplexer of the optical transmitter, the dummy signal with the optical signal so that the dummy signal is orthogonal to the optical signal so as to output an output signal to an amplifier of the optical transmitter;
• amplifying, by the amplifier, the output signal with a predetermined amplification factor corresponding to a power difference between an input stage and an output stage of the output signal in the amplifier;
• detecting, by a processor of the optical transmitter, optical power of the optical signal;
• monitoring, by the processor, density of the optical packet signal to the optical signal based on the detection result of the optical power;
• and
• controlling, by the processor, the output of the dummy signal corresponding to the density of the optical packet signal.