公开(公告)号：US20180359027A1

公开(公告)日：2018-12-13

申请号：US15992541

申请日：2018-05-30

Applicant: ADVA Optical Networking SE

Inventor： Pawel Brzozowski ,  Andreas Färbert ,  Maciej Lipski

IPC: H04B10/077 ,  H04B10/40 ,  H04J14/02 ,  H04B10/25

CPC classification number: H04B10/0775 ,  H04B10/0773 ,  H04L45/121 ,  H04Q2011/0073

Abstract: A method for determining the latency or length of an optical path of a fiber-optic transmission link includes: starting a measurement cycle at a first point in time; stopping the measurement cycle at a second point in time after having received a last measurement bit or bit pattern at the first end; determining, at the first end, the total round-trip delay of the optical path by evaluating a time information available at the first end; and calculating the length of the optical path by using the total round-trip delay and the group velocity characterizing the signal propagation along the optical path.