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

Claim 5:
6. The optical transmission system according to claim 1, wherein
the first optical node further includes an optical measuring device configured to emit to the optical fiber a first optical pulse in a first wavelength and a second optical pulse in a second wavelength and to detect reflected light of the first optical pulse from a discontinuity on the optical fiber and reflected light of the second optical pulse from the discontinuity on the optical fiber, and
the processor determines whether the optical fiber is a single-mode optical fiber based on a difference between a first propagation time and a second propagation time, the first propagation time indicating a period from a transmission of the first optical pulse to a detection of the reflected light of the first optical pulse from the discontinuity and the second propagation time indicating a period from a transmission of the second optical pulse to a detection of the reflected light of the second optical pulse from the discontinuity.