公开(公告)号：US20250123128A1

公开(公告)日：2025-04-17

申请号：US18891340

申请日：2024-09-20

Applicant: EXFO Inc.

Inventor： Vincent DEMERS-CARPENTIER ,  Eric THOMASSIN ,  Ines BAYOUDH EP BELGHITH ,  Rahma HAMMAMI

IPC: G01D5/353

Abstract: There is provided an OTDR method of assisting a user in finding a temporary event along an optical fiber link using an Optical Time Domain Reflectometer (OTDR). The method comprises: performing at least one OTDR acquisition toward the optical fiber link to obtain a baseline OTDR trace, wherein each OTDR acquisition is performed by propagating in the optical fiber link under test, a pulsed test signal and detecting corresponding return light from the optical fiber link so as to obtain an OTDR trace representing backscattered and reflected light as a function of distance in the optical fiber link; repeating OTDR acquisitions in real-time to obtain real-time OTDR traces; and for each new OTDR acquisition, comparing the corresponding real-time OTDR trace to the baseline OTDR trace to detect a temporary deformation of the OTDR trace using at least one of a difference between the baseline OTDR trace and the real-time OTDR trace and a derivative thereof, said temporary deformation being indicative of the presence of the temporary event along the optical fiber link.

公开(公告)号：US20210199536A1

公开(公告)日：2021-07-01

申请号：US17198686

申请日：2021-03-11

Applicant: EXFO Inc.

Inventor： Stephane PERRON ,  Eric THOMASSIN

IPC: G01M11/00 ,  G01B11/02 ,  G01D5/26

Abstract: There is provided a test method and system for characterizing an optical fiber link. At least one OTDR acquisition or at least one OLTS acquisition is performed on the optical fiber link. From the acquisition, a value of an excess insertion loss and/or an excess optical return loss associated with the optical fiber link under test is derived, i.e. in excess of a nominal value associated with a hypothetical optical fiber link having a length corresponding to the total length of the optical fiber link under test. A rating value (e.g., as a five-star rating) or a binary pass/fail value associated with the optical fiber link under test can then be derived and displayed.