| 摘要 |
PROBLEM TO BE SOLVED: To monitor the output level of each wavelength in a wavelength multiplex transmitting device, to optionally set the output level without an operator's operating the output levels of optical amplifiers separately with manual operation and to automatically control the output level. SOLUTION: Signal light of a different wavelength is subjected to wavelength multiplexing by a wavelength multiplexing technique and outputted. In such a case, optical amplifiers 1 and 2 which separately amplify each signal light before wavelength multiplexing are provided, their output levels, each wavelength after the wavelength multiplexing and the output level of each wavelength are measured and monitored, and the output level of each of the amplifiers 1 and 2 is automatically controlled to be a target value for the output level set target value of each wavelength after the wavelength multiplexing. |
