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

Claim 10:
11. A fiber type determination method for determining a type of an optical fiber provided between a first optical node and a second optical node, the fiber type determination method comprising:
transmitting an optical signal including a plurality of wavelength channels and an empty channel from the first optical node to the second optical node through the optical fiber;
measuring, in the second optical node, reception powers of each wavelength channel of the plurality of wavelength channels in the optical signal received through the optical fiber;
calculating 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
determining a type of the optical fiber based on a level of the crosstalk.