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公开(公告)号：US20240283532A1
公开(公告)日：2024-08-22
申请号：US18392359
申请日：2023-12-21
Applicant: EXFO Inc.
Inventor： Gang HE , Gwennael AMICE
IPC: H04B10/077 , H04B10/079
CPC classification number: H04B10/0775 , H04B10/0795
Abstract: There are herein provided methods and systems to characterize optical propagation characteristics of an optical fiber communication link (such as, e.g., a submarine line system), including ASE noise (such as traditional OSNRASE), non-linear noise (such as OSNRNL due to nonlinear distortions) and/or the GOSNR. The method uses a polarized probe signal in the optical transmission channel under test in order to probe the link under test, as well as power loading light in other optical transmission channels in order to activate non-linear effects. The propagated test signal is then analyzed under varied polarization conditions using a varied-SOP polarization-resolved optical spectrum analysis of the propagated probe signal.
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112.发明公开公开(公告)号：US20240283531A1
公开(公告)日：2024-08-22
申请号：US18416224
申请日：2024-01-18
Applicant: EXFO INC.
Inventor： Gang HE
IPC: H04B10/073 , H04B10/293
CPC classification number: H04B10/0731 , H04B10/293
Abstract: Methods and systems are disclosed for characterizing a polarization-dependent loss or gain (PDL/G) of an optical device under test (DUT), such as an optical fiber link, from an optical signal having passed through the optical DUT. The optical signal is substantially unpolarized upon entering the optical DUT. The method can include varying a state of polarization (SOP) of the optical signal over a plurality of sampled SOP conditions to produce a respective plurality of SOP-varied optical signals; performing a polarization-analysis and detection operation on the plurality of SOP-varied optical signals to acquire a respective plurality of detected signal sets, each detected signal set including at least one polarization-analyzed detected signal; and determining, as the PDL/G of the optical DUT, a polarization extinction ratio parameter representative of a ratio of maximum to minimum power levels measured among the polarization-analyzed detected signals of the plurality of detected signal sets.
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公开(公告)号：US12050149B2
公开(公告)日：2024-07-30
申请号：US17455229
申请日：2021-11-17
Applicant: EXFO Inc.
Inventor： Olivier Cote , Aymen Salahddine , Mario L'Heureux
CPC classification number: G01M11/31 , G02B6/3624 , G02B21/02 , G06T7/0004 , G06V10/10 , G06T2207/10056 , G06T2207/30164
Abstract: There is provided an optical-fiber connector endface inspection microscope system for inspecting an endface of an optical-fiber connector. It comprises one or more image detector for capturing at least one image of the endface to be inspected; an objective lens system comprising a focusing lens for adjusting a focus of the objective lens system on the image detector and a fixed relay lens; a main housing structure enclosing the image detector and the focusing lens; and at least one interchangeable optical head releasably connectable to the main housing structure and enclosing the fixed relay lens, wherein the optical head is releasably connectable to an adapter tip for interfacing with the optical-fiber connector to be inspected.
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公开(公告)号：US12047117B2
公开(公告)日：2024-07-23
申请号：US17443607
申请日：2021-07-27
Applicant: EXFO Inc.
Inventor： Gang He , Michel Leclerc
IPC: H04B10/079 , G02B6/42
CPC classification number: H04B10/07955 , G02B6/4286
Abstract: There are provided herein test instruments, devices and methods for measuring the optical power loss of optical-fiber devices under test, and particularly those terminated with multifiber connectors, which allows for a one-cord or one-cord equivalent reference method whichever the pinning of the actual optical-fiber device under test. There is proposed to add an optical-fiber expansion device to convert the pinning of the input interface of the power meter instrument from pinned to unpinned or vice-versa, while not adding extra measurement uncertainty. This is accomplished using a patch cord which core diameter is between that of the device under test and that of the input interface of the power meter instrument.
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115.发明公开公开(公告)号：US20230367082A1
公开(公告)日：2023-11-16
申请号：US18310861
申请日：2023-05-02
Applicant: EXFO Inc.
Inventor： Olivier COTE , Mario L'HEUREUX , Raphael LABERGE
CPC classification number: G02B6/385 , G02B6/3825 , G02B6/3853 , G02B21/0016 , G02B21/0008
Abstract: There is provided an adapter tip to be employed with an optical-fiber connector-endface inspection microscope device and an optical-fiber connector endface inspection microscope system suitable for imaging the endface of a duplex optical-fiber connector. Because of the distance between the ferrules of a duplex connector, the field of view of a typical single-fiber or multi-fiber inspection microscope may not be wide enough to allow inspection of both ferrules at once. The proposed adapter tip or microscope system may comprise relay optics configured to laterally shift the optical path of the light beam reflected from one optical fiber endface (corresponding the first ferrule) toward that from the other optical fiber endface (corresponding the second ferrule), so that both endfaces may be imaged within the field of view of the inspection microscope.
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Patent Agency Ranking
公开(公告)号：US20230228649A1
公开(公告)日：2023-07-20
申请号：US18096456
申请日：2023-01-12
Applicant: EXFO Inc.
Inventor： Michel LECLERC , Nicholas COLE
IPC: G01M11/00
CPC classification number: G01M11/33
Abstract: There is provided herein a solution for measuring the optical power loss of duplex optical-fiber devices under test, and particularly those terminated with a duplex connector interface, which allows for a one-cord or one-cord equivalent testing method whichever the format of the duplex connector interface of the optical-fiber device under test, and this without disconnecting the optical fibers of the device under test from their duplex native connector interface. There is provided an optical-fiber expansion device to be used to interconnect and adapt a power meter instrument to a variety of duplex connectors. The proposed optical-fiber expansion device comprises a pair of optical fibers having a core diameter and a numerical aperture that are greater than those of the optical fiber in the DUT connector interface, so as to make it compatible with the one-cord testing method. Interchangeable optical-fiber expansion devices can be used to match the power meter interface on one side, to various duplex connector interfaces under test on the other side.
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公开(公告)号：US11540234B2
公开(公告)日：2022-12-27
申请号：US17108716
申请日：2020-12-01
Applicant: EXFO Inc.
Inventor： Marco Di Pietro , Martin Levesque
Abstract: A method comprising obtaining, via a test system, data from one or more tests of a mobile network having at least one antenna, wherein the data includes a stream of RF samples captured over-the-air or from a Common Public Radio Interface (CPRI) or enhanced CPRI (eCPRI) link; processing the data to detect peaks; performing an analysis of any detected peaks to identify any issues on the mobile network, the analysis including determining a relative power of the detected peaks; and causing display of a user interface that includes a reporting of any the relative power. Determining a relative power includes obtaining a baseline of a subset of the data and comparing an absolute power of the peak to the baseline.
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公开(公告)号：US11522939B2
公开(公告)日：2022-12-06
申请号：US17351368
申请日：2021-06-18
Applicant: EXFO Inc.
Inventor： Sylvain Nadeau , Kevin Corre
Abstract: A method for Over-The-Top (OTT) media service monitoring and testing including deploying multiple test agents throughout the network and orchestrating them together to create a single OTT media service delivery path with coherent measurement points. The method includes selecting and configuring all test agents forming an OTT media service delivery path in a network, wherein the test agents are deployed on devices in the network with pairs of agents in a client-server relationship; for each selected test agent, simulating a Hyper Text Transport Protocol (HTTP) Adaptive Streaming (HAS) media playback using a pair test agent as a HAS server; for each selected test agent, monitoring the HAS media playback via a Quality of Experience (QoE) model to collect metrics, influence factors, and QoE scores; and reporting collected metrics, influence factors and QoE scores, wherein the QoE scores are compared to isolate any performance degradation.
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公开(公告)号：US11519782B2
公开(公告)日：2022-12-06
申请号：US17002970
申请日：2020-08-26
Applicant: EXFO Inc.
Inventor： Nelu Radu
IPC: G01J1/44
Abstract: There is provided an optical power measurement method, an offset calibration method and an optical power meter that is adapted to apply the offset calibration method. The optical power measurement method, the offset calibration method and the optical power meter are characterized in that two temperature sensors are used for more accurate predictions of the optical power offset. A first temperature sensor is positioned to read a temperature of the photodiode and a second temperature sensor is positioned to read a temperature of the PCB ground plane.
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120.发明申请公开(公告)号：US20220191597A1
公开(公告)日：2022-06-16
申请号：US17549271
申请日：2021-12-13
Applicant: EXFO Inc.
Inventor： Sylvain NADEAU
IPC: H04N21/647 , H04N21/25
Abstract: A method includes obtaining a first Quality of Experience, QoE, measurement from a first content source; determining a QoE adjustment factor based on a predictive model; and adjusting the first QoE measurement using the QoE adjustment factor to obtain a second QoE measurement, the second QoE measurement reflects a QoE estimate from a second content source. The first content source can be a Content Delivery Network, CDN, entity, and the second content source is an Over-the-Top, OTT, content provider.
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