US 12,316,372 B2
Localization of an anomaly in an optical transmission system
Inwoong Kim, Allen, TX (US); Olga I. Vassilieva, Plano, TX (US); and Paparao Palacharla, Richardson, TX (US)
Assigned to FUJITSU LIMITED, Kawasaki (JP)
Filed by Fujitsu Limited, Kawasaki (JP)
Filed on Nov. 14, 2022, as Appl. No. 17/986,815.
Prior Publication US 2024/0162981 A1, May 16, 2024
Int. Cl. H04B 10/07 (2013.01); H04B 10/079 (2013.01)
CPC H04B 10/0791 (2013.01) 20 Claims
OG exemplary drawing
 
1. A method comprising:
obtaining, by a receiving device, a first optical signal and a second optical signal propagating in a transmission medium, the first optical signal including a first wavelength, the second optical signal including a second wavelength;
obtaining a determination that an anomaly is present in the transmission medium; in response to the determination that the anomaly is present in the transmission medium, determining a relationship between the first optical signal and the second optical signal using a cross-correlation to obtain a time delay, wherein the cross-correlation comprises an integral of a first monitored power associated with the first optical signal multiplied by a second monitored power associated with the second optical signal as the second optical signal is shifted in time; and
determining an anomaly location in the transmission medium using the time delay, the first wavelength, and the second wavelength.