Patent ID: 11876559
Assignee: FUJITSU LIMITED
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
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.