US 11,990,988 B2
Optical transmission system and optical transmission device
Naoki Ainaka, Kawasaki (JP); Yoshito Kachita, Kawasaki (JP); and Tomohiro Yamauchi, Kawasaki (JP)
Assigned to FUJITSU LIMITED, Kawasaki (JP)
Filed by FUJITSU LIMITED, Kawasaki (JP)
Filed on Jul. 25, 2022, as Appl. No. 17/872,329.
Claims priority of application No. 2022-074218 (JP), filed on Apr. 28, 2022.
Prior Publication US 2022/0385390 A1, Dec. 1, 2022
Int. Cl. H04J 14/02 (2006.01)
CPC H04J 14/0221 (2013.01) 8 Claims
OG exemplary drawing
 
1. An optical transmission system that transmits a WDM (wavelength division multiplexed) signal from a first optical transmission device to a second optical transmission device via an optical fiber transmission line, the optical transmission system comprising:
an optical channel monitor that detects optical power of each wavelength channel of the WDM signal in the second optical transmission device;
a processor that controls optical power of each wavelength channel of the WDM signal based on a detection result by the optical channel monitor in the first optical transmission device;
an optical circuit that adjusts optical power of each wavelength channel of the WDM signal based on a control signal from the processor in the first optical transmission device; and
a second processor that decides whether or not optical powers of wavelength channels of the WDM signal have converged to a target level based on a detection result by the optical channel monitor, wherein
when the optical powers of wavelength channels of the WDM signal have not converged to the target level, the processor controls the optical circuit using the control signal in a first cycle, and
when the optical powers of wavelength channels of the WDM signal have converged to the target level, the processor controls the optical circuit using the control signal in a second cycle longer than the first cycle.