公开(公告)号：US09240855B1

公开(公告)日：2016-01-19

申请号：US14141173

申请日：2013-12-26

Applicant: Google Inc.

Inventor： Cedric F. Lam ,  James F. Kelly ,  Austin B. Schuh

IPC: H04J14/00 ,  H04J14/02 ,  G01M11/00

CPC classification number: H04J14/0227 ,  G01M11/3109 ,  H04B10/071 ,  H04J14/0212 ,  H04Q11/0067 ,  H04Q2011/0083

Abstract: Implementations of techniques and systems are disclosed for detecting a fiber fault in a point-to-point optical access network based on optical time domain reflectometry (“OTDR”) measurements. The techniques include identifying loss of service between a central office (“CO”) and a given optical network unit (“ONU”) of a plurality of ONUs. In response to the identifying the loss of service, configuring a test signal distribution unit to optically couple an OTDR unit to a selected subset of the point-to-point fiber links which includes the given ONU. An optical test signal is launched from the OTDR unit into the selected subset of the point-to-point fiber links via the test signal distribution unit. Test signal reflections are received from each of the point-to-point fiber links within the selected subset as a reflection signature, which is analyzed to identify a location of the fiber fault.

Abstract translation: 公开了用于基于光时域反射测量（“OTDR”）测量来检测点对点光接入网络中的光纤故障的技术和系统的实现。 这些技术包括识别中心局（“CO”）与多个ONU的给定光网络单元（“ONU”）之间的服务丢失。 响应于识别服务丢失，配置测试信号分配单元将OTDR单元光学地耦合到包括给定ONU的点对点光纤链路的选定子集。 光测试信号通过测试信号分配单元从OTDR单元发射到点对点光纤链路的所选子集中。 从所选择的子集内的每个点对点光纤链路接收测试信号反射作为反射特征，被分析以识别光纤故障的位置。