US 12,334,979 B2
Optical wavelength multiplexing transmission device and optical wavelength multiplexing transmission method
Shigeru Ishii, Ota (JP); Tatsuya Tsuzuki, Kawasaki (JP); Takehiro Fujita, Setagaya (JP); and Tomoaki Takeyama, Yokohama (JP)
Assigned to Fujitsu Limited, Kawasaki (JP)
Filed by Fujitsu Limited, Kawasaki (JP)
Filed on Nov. 3, 2022, as Appl. No. 17/979,811.
Claims priority of application No. 2022-010154 (JP), filed on Jan. 26, 2022.
Prior Publication US 2023/0239050 A1, Jul. 27, 2023
Int. Cl. H04J 14/00 (2006.01); H04B 10/079 (2013.01); H04B 10/2507 (2013.01); H04J 14/02 (2006.01)
CPC H04B 10/2507 (2013.01) [H04B 10/07955 (2013.01); H04J 14/0307 (2023.08)] 8 Claims
OG exemplary drawing
 
1. An optical wavelength multiplexing transmission device comprising:
a demultiplexer configured to demultiplex a wavelength multiplexing signal for each wavelength band from a multiplexed signal that includes wavelength multiplexing signals in a plurality of the wavelength bands;
a processor configured to detect an optical power value of each wavelength multiplexing signal for each wavelength band;
calculate a compensation amount used to compensate a tilt of the wavelength multiplexing signal, by using the optical power value and a predetermined calculation expression; and
compensate the tilt of the wavelength multiplexing signal, based on the compensation amount; and
a multiplexer configured to multiplex each wavelength multiplexing signal compensated by the processor and output the wavelength multiplexing signal to a transmission line,
wherein the processor is further configured to:
acquire transmission line characteristics that indicates an optical power value in each wavelength band for each transmission distance of the transmission line;
calculate a generated tilt amount of the transmission line, based on the transmission line characteristics;
calculate an estimated compensation amount used to compensate the tilt of the wavelength multiplexing signal, by using the generated tilt amount of the transmission line and the predetermined calculation expression;
calculate a correction coefficient used to correct the predetermined calculation expression, based on the estimated compensation amount and a current compensation amount; and
update the correction coefficient.