| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical ADM node device which can effectively reduce the influence of noise caused by ASE of an optical amplifier. SOLUTION: The optical ADM node devices has an optical amplifier 11 which amplifies a wavelength-multiplex signal light transmitted through an optical transmission line 10, an optical demultiplexer 12 which demultiplexes the amplified wavelength-multiplex signal into signal lights of respective wavelengths and also branches a signal light of a desired wavelength, an optical receiver 16 which receives the branched signal light of the desired wavelength, an optical transmitter 19 which outputs the signal light of the desired wavelength, and an optical multiplexer 13 which multiplexes and sends out of the signal light of the respective wavelengths demultiplexed by the optical demultiplexer 12 and the signal light from the optical transmitter 19 to the optical transmission line 10; and optical filters 32-1 to 32-3 which are tuned to the respective wavelengths of the signal light demultiplexed by the optical demultiplexer 12 are inserted into optical paths 31-1 to 31-2 between the optical demultiplexer 12 and optical multiplexer 13. |
