EXFO

Systems and methods for fast testing of an optical fiber network are provided. A main testing unit and a remote testing unit are optically coupled to opposite extremities of first and second FUT of the network, Each testing unit has a a reflectometric branch with a light source and light detector, and a power meter branch with a power meter but devoid of light sources. Each testing unit also includes a primary switching stage having two unit-side ports optically coupled to the reflectometric branch and power meter branch, respectively, and two network-side ports optically coupled to the first and second FUTs, respectively. In use, optical test signals can be sent from opposite test units into the two FUTs to double the acquisition speed compared to traditional techniques.

A method of locating a hollow-core fiber segment amongst silica core segments in optical fiber link is provided. An OTDR test instrument sends test signals along the fiber link and a Rayleigh backscatter level as a function of distance along the optical fiber link of returning signals is measured. The position of the proximal extremity of the hollow-core optical fiber segment is identified by locating a discrete drop greater than a drop threshold value in the Rayleigh backscatter level. The position of the distal extremity of the hollow-core fiber segment is identified by locating one of a discrete step greater than a step threshold value in the Rayleigh backscatter level and end-of-fiber indicator. The drop threshold value and the step threshold value are commensurate with a difference between a Rayleigh backscatter level in hollow-core optical fibers and in the type of silica core optical fibers of the optical fiber link.

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Systems and methods (100) of mobile network synchronization domain anomaly identification and correlation include steps of receiving (102) measurements from a synchronization domain (20) reflecting the performance of synchronization across a mobile network (10); identifying (104) synchronization domain anomalies in the measurements from the synchronization domain (20); correlating (106) of the synchronization domain anomalies against anomalies from other domains (14, 16, 18) of the mobile network (10); and one or more (108) of (1) identifying root causes of the synchronization domain anomalies and the anomalies from other domains (14, 16, 18), (2) identifying associated impact on services and/or subscribers of the synchronization domain anomalies and the anomalies from other domains (14, 16, 18), and (3) identifying remedial actions for the synchronization domain anomalies and the anomalies from other domains (14, 16, 18).

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Methods and systems for referencing an optical power loss measurement (OPLM) system, and methods and systems for measuring an optical insertion loss of an optical device under test (DUT) using an OPLM system referenced as such. The herein-provided reflectometric one-cord referencing method combines the capabilities of an OPLM system with that of an Optical Time Domain Reflectometer (OTDR). A first test unit comprises an optical source that is used as the light source in the OPLM. A second test unit comprises a power meter which is used as the power meter in the OPLM measurement. Either the first or the second test unit comprises an OTDR acquisition device. The reflectometric one-cord reference measures the connector loss along the reference link using OTDR capabilities of the test unit(s). Once the power reference of the OPLM devices is obtained, the reflectometric one-cord reference method may determine the optical insertion loss of the DUT while eliminating the measured connector loss.

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In order to assist in determining the physical nature of an optical event as monitored by an OTDR in an optical fiber network, there are herein provided OTDR methods and system which leverage historical values measured on reflective events for characterizing events along an optical fiber link. A plurality of OTDR acquisitions is performed toward the optical fiber link over a period of time. Parameters characterizing a target event are derived using the recorded OTDR acquisitions. One of said parameters represents a stability, over the period of time, of a reflectance peak level associated with the event. The event is classified at least based on said stability.