| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical transmission apparatus which enables low-delay transmission for transmitting an optical signal as it is and additional extraction of a signal that requires electric processing.SOLUTION: A determination control circuit stops transmitting a modulation signal to an optical modulator if there is no signal in an additional electric buffer, performs operation for reproducing all optical signals on a semiconductor optical amplifier if there is no extraction signal in an electric buffer, controls the semiconductor optical amplifier so as to transmit only signals other than an extraction object if there is an extraction signal in the electric buffer, performs optical saturation control on the semiconductor optical amplifier if there is a signal in the additional electric buffer, reads signals from the electric buffer and the additional electric buffer if there is no extraction signal in the electric buffer, transmits the modulation signal to the optical modulator, reads the signal other than the extraction object in the electric buffer and the signal in the additional electric buffer if there is the extraction signal in the electric buffer, and transmits the modulation signal to the optical modulator. |
