US 9,813,183 B2
Optical transmission device and optical transmission system
Kentaro Nakamura, Machida (JP); Yoshito Kachita, Kawasaki (JP); Satoru Okano, Yokohama (JP); and Yusaku Yamamoto, Kawasaki (JP)
Assigned to FUJITSU LIMITED, Kawasaki (JP)
Filed by FUJITSU LIMITED, Kawasaki-shi, Kanagawa (JP)
Filed on Sep. 9, 2015, as Appl. No. 14/848,718.
Claims priority of application No. 2014-201349 (JP), filed on Sep. 30, 2014.
Prior Publication US 2016/0094307 A1, Mar. 31, 2016
Int. Cl. H04B 10/08 (2006.01); H04J 14/02 (2006.01); H04B 10/294 (2013.01); H01S 3/067 (2006.01); H01S 3/16 (2006.01); H04B 10/079 (2013.01); H01S 3/13 (2006.01)
CPC H04J 14/0221 (2013.01) [H04B 10/2942 (2013.01); H01S 3/06754 (2013.01); H01S 3/1301 (2013.01); H01S 3/1608 (2013.01); H04B 10/07953 (2013.01); H04B 10/07955 (2013.01)] 7 Claims
OG exemplary drawing
 
1. An optical transmission device comprising:
memory; and
a processor coupled to the memory and configured to:
receive a first signal light and a second signal light, the first signal light and the second signal light having power levels that correspond to transmission distances;
receive monitoring information of optical signal-to-noise ratios (OSNRs) of the first signal light and the second signal light;
amplify the first signal light and the second signal light in accordance with a signal light having a high power level;
increase a gain value of the amplification of the first signal light and the second signal light when the OSNR is less than a certain lower limit value; and
transmit the amplified first signal light and the amplified second signal light.