Patent ID: 8290364
Filing Date: 2012-10-16
Classification: H04B

Abstract:
1. A method for locating fiber events, comprising: determining a distance between an event and an Optical Line Terminal (OLT); determining whether the event occurs on a backbone fiber in a passive optical network (PON) according to the distance between the event and the OLT; if it is determined that the event does not occurs on the backbone fiber, measuring optical loss of an optical channel between the OLT and an Optical Network Unit (ONU) or Optical Network Terminal (ONT), wherein the ONU or ONT is located at a peer end of a branch fiber in the PON; and determining whether the event occurs on the branch fiber according to a relationship between the measured optical loss and a predetermined optical loss of the optical channel, and, if so, determining a location of the event on the branch fiber according to the distance between the event and the OLT; wherein the optical loss comprises downlink optical loss of the optical channel, and the measuring of the optical loss of the optical channel between the OLT and the ONU or ONT comprising: calculating, by the OLT, the downlink optical loss of the optical channel based on the transmitted power measured by the OLT and the received power uploaded by the ONU or ONT; wherein the measured optical loss further comprises uplink optical loss, and the measuring of the optical loss of the optical channel between the OLT and an ONU or ONT further comprising: sending, by the ONU or ONT, an uplink test signal to the OLT through the optical channel; measuring, by the ONU or ONT, a transmitted power of the uplink test signal sent to the OLT; and uploading, by the ONU or ONT, the transmitted power of the test signal to the OLT through the optical channel; receiving, by the OLT, the uplink test signal sent from the ONU or ONT through the optical channel; receiving, by the OLT, the transmitted power of the uplink test signal sent from the ONU or ONT; measuring, by the OLT, a received power of the uplink test signal when the uplink test signal is received at the OLT; calculating, by the OLT, the uplink optical loss of the optical channel between the OLT and the ONU or ONT based on the transmitted power uploaded by the ONU or ONT and the received power measured by the OLT.