US 11,876,559 B2
Optical transmission system and fiber type determination method
Goji Nakagawa, Sagamihara (JP); Takafumi Terahara, Kawasaki (JP); and Hiroki Oi, Kawasaki (JP)
Assigned to FUJITSU LIMITED, Kawasaki (JP)
Filed by FUJITSU LIMITED, Kawasaki (JP)
Filed on Jul. 29, 2022, as Appl. No. 17/876,782.
Claims priority of application No. 2022-054247 (JP), filed on Mar. 29, 2022.
Prior Publication US 2022/0385364 A1, Dec. 1, 2022
Int. Cl. H04B 10/08 (2006.01); H04B 10/2525 (2013.01); H04B 10/079 (2013.01)
CPC H04B 10/2525 (2013.01) [H04B 10/07955 (2013.01)] 11 Claims
OG exemplary drawing
 
1. An optical transmission system that includes a first optical node, a second optical node, and an optical fiber provided between the first optical node and the second optical node, the optical transmission system comprising:
a signal generator provided in the first optical node and configured to generate an optical signal including a plurality of wavelength channels and an empty channel;
an optical transmission circuit provided in the first optical node and configured to output the optical signal to the optical fiber;
an optical channel monitor provided in the second optical node and configured to measure reception powers of each wavelength channel of the plurality of wavelength channels in the optical signal received through the optical fiber; and
a processor configured to
calculate crosstalk in a wavelength in which the empty channel is provided, the crosstalk occurring due to the plurality of wavelength channels in the optical fiber, based on a ratio between the reception powers of the plurality of wavelength channels and a reception power of the empty channel, and
determine a type of the optical fiber based on a level of the crosstalk.