公开(公告)号：US09945659B2

公开(公告)日：2018-04-17

申请号：US15469229

申请日：2017-03-24

Applicant: Huawei Technologies Co., Ltd.

Inventor： Jian Yin ,  Fan He

IPC: G01B11/02 ,  H04B10/07 ,  G01M11/00

CPC classification number: G01B11/02 ,  G01B11/026 ,  G01M11/088 ,  G01M11/33 ,  G01M11/332 ,  H04B10/07

Abstract: Embodiments of the present invention provide an optical fiber length measurement method and apparatus, where the method is used to measure an optical fiber length between a first device and a second device, and the method includes: acquiring, by a measurement device, timestamp parameters, where the timestamp parameters include a first transmit timestamp Ta1, a first receive timestamp Ta2, a second transmit timestamp Tb1, and a second receive timestamp Tb2; and determining, by the measurement device, the optical fiber length L according to the timestamp parameters, where when (Ta2−Tb1)+(Tb2−Ta1)≤n*T, L=2.5*[(Ta2−Tb1)+(Tb2−Ta1)], or when (Ta2−Tb1)+(Tb2−Ta1)>n*T, L=2.5*[(Ta2−Tb1)+(Tb2−Ta1)−n*T]. The method does not depend on a dedicated measurement instrument such as an OTDR, an OFDR, or an OCDR, thereby simplifying a measurement process, and helping reduce a measurement cost.