US 12,438,610 B2
Device and method for estimating characteristics of optical fiber transmission line
Motohiko Eto, Kawasaki (JP); Kazuyuki Tajima, Yokosuka (JP); Setsuo Yoshida, Inagi (JP); and Shoichiro Oda, Fuchu (JP)
Assigned to Fujitsu Limited, Kawasaki (JP)
Filed by Fujitsu Limited, Kawasaki (JP)
Filed on Mar. 2, 2023, as Appl. No. 18/177,197.
Claims priority of application No. 2022-090642 (JP), filed on Jun. 3, 2022.
Prior Publication US 2023/0396332 A1, Dec. 7, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04B 10/25 (2013.01); G01M 11/00 (2006.01); H04B 10/071 (2013.01)
CPC H04B 10/071 (2013.01) [G01M 11/3127 (2013.01); H04B 10/25 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A characteristics estimation device that estimates characteristics of an optical fiber transmission line in an optical transmission system in which an optical signal is transmitted from a first node to a second node via the optical fiber transmission line, the characteristics estimation device comprising:
a span detector that detects one or more spans forming the optical fiber transmission line by using a power profile, the power profile indicating a relationship between power of the optical signal and a dispersion amount corresponding to a transmission distance from the first node or the second node;
a coefficient calculator that calculates, for each detected span, a dispersion coefficient of the optical fiber transmission line by dividing a dispersion amount estimated based on the power profile by a corresponding span length; and
an estimator that estimates, for each detected span, a type of an optical fiber forming the optical fiber transmission line based on the calculated dispersion coefficient.