US 12,231,227 B2
Transmission apparatus and transmission system
Xiang Zhang, Yokohama (JP); Atsushi Kodama, Kawasaki (JP); Tatsuya Tsuzuki, Kawasaki (JP); and Kyosuke Sone, Kawasaki (JP)
Assigned to Fujitsu Limited, Kawasaki (JP)
Filed by Fujitsu Limited, Kawasaki (JP)
Filed on Feb. 17, 2023, as Appl. No. 18/170,799.
Claims priority of application No. 2022-088762 (JP), filed on May 31, 2022.
Prior Publication US 2023/0388040 A1, Nov. 30, 2023
Int. Cl. H04B 10/00 (2013.01); H04B 10/564 (2013.01); H04J 14/02 (2006.01); H04J 14/00 (2006.01)
CPC H04J 14/0221 (2013.01) [H04B 10/564 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A transmission apparatus comprising:
a signal power detector configured to detect signal power of a wavelength-multiplexed optical signal to be transmitted to a transmission line;
a variable optical attenuator configured to attenuate the wavelength-multiplexed optical signal; and
a processor configured to control an attenuation amount of the variable optical attenuator according to the signal power and whether a Raman amplifier in which pumping light is inputted to the transmission line exists.