Patents Assigned to Exfo Inc.
  • Publication number: 20190245641
    Abstract: A device and method for optical power measurement in an optical network supporting upstream and downstream signal propagation along an optical transmission path. An upstream wavelength analyzer receives upstream light extracted from the optical transmission path and is configured to determine an upstream spectral characteristic of the extracted upstream light. A downstream optical power meter assembly receives downstream light extracted from the optical transmission path and is configured to measure an optical power parameter of a downstream signal. A processing unit is configured to determine, based on the upstream spectral characteristic, at least one pass/fail threshold associated with the measured optical power parameter of the downstream signal.
    Type: Application
    Filed: April 18, 2019
    Publication date: August 8, 2019
    Applicant: EXFO Inc.
    Inventors: Bernard RUCHET, Mario L'HEUREUX, Daniel GARIEPY, Etienne MORIN-DROUIN
  • Patent number: 10371596
    Abstract: There is provided a method and a system for identifying or verifying the fiber arrangement and/or the cable type of multi-fiber array cables (such as MPO cables) which employs an OTDR acquisition device at the near end of the MPO cable, a loopback device at the far end and an array of signatures detectable by the OTDR, either at the far or the near end. The loopback device allows performing bidirectional OTDR measurements with a single OTDR acquisition device (without moving it from one end to the other) and the signature array provides fiber arrangement/cable type identification or verification.
    Type: Grant
    Filed: August 7, 2015
    Date of Patent: August 6, 2019
    Assignee: EXFO Inc.
    Inventors: Mario L'Heureux, Stephane Perron, Michel Leclerc
  • Publication number: 20190170610
    Abstract: There is provided a method, system and image capture device for determining a polarity of a multi-fiber cable link comprising a plurality of optical fiber links each connected between a first multi-fiber connector and a second multi-fiber connector, according to said polarity. Test light is injected into one or more of the optical fiber links via corresponding injection ports of the first multi-fiber connector, in accordance with a defined injection pattern; at least one polarity-testing image of the second multi-fiber connector is generated in which test light exiting at least one of the optical fiber links through one or more exit ports of the second multi-fiber connector is imaged as one or more spotlight spots in the polarity-testing image; and the polarity of the multi-fiber cable link is determined based on a pattern of said one or more spotlight spots in said polarity-testing image.
    Type: Application
    Filed: April 11, 2018
    Publication date: June 6, 2019
    Applicant: EXFO Inc.
    Inventors: Stephane PERRON, Daniel GARIEPY, Nicolas CARON, Robert BARIBAULT, Vincent RACINE
  • Patent number: 10288524
    Abstract: There is provided a system and a test instrument for identifying or verifying the fiber arrangement and/or the cable type of multi-fiber array cables (such as MPO cables) which employs a light source and a polarity detector at the near end of the multi-fiber array cable under test, and a loopback device at the far end. The polarity detector comprises light presence detectors used to detect which one of the optical fibers of the multi-fiber array cable returns light looped back at the far end and thereby determine the fiber arrangement and/or the cable type of the multi-fiber array cable.
    Type: Grant
    Filed: February 8, 2017
    Date of Patent: May 14, 2019
    Assignee: EXFO Inc.
    Inventors: Michel Leclerc, Mario L'Heureux, Stephane Perron
  • Patent number: 10270554
    Abstract: A device and method for optical power measurement in an optical network supporting upstream and downstream signal propagation along an optical transmission path. The device includes an upstream wavelength analyzer receiving upstream light extracted from the optical transmission path and configured to determine an upstream spectral characteristic of the extracted upstream light. The device also includes a downstream filter assembly receiving downstream light extracted from the optical transmission path and configured to spectrally split the extracted downstream light into a plurality of downstream signals, one of which corresponding to a downstream signal of interest.
    Type: Grant
    Filed: November 27, 2017
    Date of Patent: April 23, 2019
    Assignee: EXFO INC.
    Inventors: Bernard Ruchet, Mario L'Heureux, Daniel Gariepy, Etienne Morin-Drouin
  • Patent number: 10200118
    Abstract: A multimode launch system to be connected to an Optical Time-Domain Reflectometer (OTDR) for use in performing at least one OTDR measurement on a multi-fiber array Device Under Test (DUT), the multimode launch system comprising: an optical switch being connectable to the OTDR during use; a launch array device having an end being connectable to the optical switch and another end being connectable to the multi-fiber array DUT during use, the launch array device having a plurality of multimode launch optical fibers each having at least one first guidance parameter being smaller than a corresponding one of at least one second guidance parameter of at least one multimode optical fiber of the optical switch; and a multi-fiber mode conditioner along the launch array device for inducing a preferential attenuation of higher-order optical modes of test light propagated into the multi-fiber array DUT during use.
    Type: Grant
    Filed: January 11, 2018
    Date of Patent: February 5, 2019
    Assignee: EXFO Inc.
    Inventor: Bernard Ruchet
  • Patent number: 10175142
    Abstract: An inspection system for inspecting a multiple-fiber connector is provided. The inspection system includes a microscope probe and a probe tip configured to provide an optical path between the microscope probe and the multiple-fiber connector. The probe tip and microscope probe are configured so that the field of view of the microscope probe is sufficiently large to cover a portion of the connector surface encompassing a plurality of the optical fiber endfaces. The system further includes a shifting mechanism operable to shift the field of view of the microscope probe between at least two discrete positions over the connector surface. Each discrete position encompasses a different subset of the multiple optical fiber endfaces and optionally at least one positioning reference. A probe tip and a method of inspection are also provided.
    Type: Grant
    Filed: June 27, 2016
    Date of Patent: January 8, 2019
    Assignee: EXFO Inc.
    Inventors: Denis Lafrance, Bernard Ruchet, Robert Baribault
  • Patent number: 10128975
    Abstract: There is provided a method to discriminate NLE-induced signal deformation from ASE-noise on polarization multiplexed signals, in order to measure the OSNR under NLE conditions and/or characterize the NLE-induced signal deformation. In accordance with one aspect, the method is based on the acquisition of optical spectrum traces when the (data-carrying) optical communication signal is partially or completely extinguished (ASE-noise only), as well as with a live optical communication signal. Comparing traces acquired with different conditions and/or at different dates allows discrimination of the signal contribution, the ASE-noise contribution and the NLE-induced deformations on the SUT.
    Type: Grant
    Filed: November 4, 2015
    Date of Patent: November 13, 2018
    Assignee: EXFO Inc.
    Inventors: Gang He, Daniel Gariepy
  • Patent number: 10018785
    Abstract: There is provided a modal distribution conditioner comprising the combination of a mandrel-wrapped optical fiber and an adjustable and fixable loop of optical fiber. It is noted that light entering the modal distribution conditioner is to be generally overfilled compared with the target encircled flux function (as defined by the Standard). The mandrel wrapping introduces macrobends to the optical fiber, inducing modal pre-filtering that roughly transforms the initially overfilled modal distribution to be close to compliance with the appropriate Standard. However, the modal distribution of light having traversed the fixed mandrel typically remains somewhat overfilled. The adjustable loop provides for the fine-tuning of the modal distribution, in conformity with the Standard. Once the requirements defined by the Standard are met, the adjustable loop may be secured in place such that modal distribution becomes fixed and remain stable.
    Type: Grant
    Filed: June 11, 2014
    Date of Patent: July 10, 2018
    Assignee: EXFO Inc.
    Inventors: Remi Fortin, Gang He
  • Patent number: 10014935
    Abstract: An OTDR device and method for characterizing one or more events in an optical fiber link are provided. A plurality of light acquisitions is performed. For each light acquisition, test light pulses are propagated in the optical fiber link and the corresponding return light signals from the optical fiber link are detected. The light acquisitions are performed under different acquisition conditions, for example using different pulsewidths or wavelengths. Parameters characterizing the event are derived using the detected return signal from at least two of the plurality of light acquisitions.
    Type: Grant
    Filed: February 8, 2017
    Date of Patent: July 3, 2018
    Assignee: EXFO INC.
    Inventors: St├ęphane Perron, Michel Leblanc
  • Patent number: 9954610
    Abstract: There are provided methods and devices for determining a quality parameter characterizing an optical communication signal, the methods being performed by signal detection devices. At the transmitting end, there are obtained a signal power P1 of a first optical signal, a signal power P2 of a second optical signal, a signal power P3 of a third optical signal, optionally a signal power P4 of a fourth optical signal, and a total signal power Ps of a channel where the first, second, third and optional fourth optical signals are located. At a detection point, there are further obtained a signal power P1? of the first optical signal, a signal power P2? of the second optical signal, a signal power P3? of the third optical signal and optionally a signal power P4? of the fourth optical signal. There are then determined a signal deformation factor SDF and/or an optical signal to ASE noise ratio OSNR from the obtained signal powers.
    Type: Grant
    Filed: November 4, 2015
    Date of Patent: April 24, 2018
    Assignee: EXFO Inc.
    Inventors: Gang He, Daniel Gariepy
  • Patent number: 9921373
    Abstract: There is provided a mating assembly for mating a fiber-optic termination comprising a fiber-optic ferrule to an optical test instrument. The mating assembly comprises: a holding body having internal tubular dimensions substantially complementary to corresponding external dimensions of the fiber-optic ferrule of said fiber-optic termination, to hold the fiber-optic ferrule in a given alignment relative to the optical test instrument; and at least one deformable elastomeric feature extending inwardly in the holding body to frictionally engage on a smooth external surface of said fiber-optic ferrule and to provide friction thereon to retain said fiber-optic ferrule.
    Type: Grant
    Filed: December 16, 2014
    Date of Patent: March 20, 2018
    Assignee: EXFO INC.
    Inventor: Sebastien Nadeau
  • Patent number: 9915790
    Abstract: The fiber inspection microscope and power measurement system for inspecting an endface of an optical fiber at an angle-polished connector generally has: a mating interface for receiving the angle-polished connector, the endface causing a mean propagation direction of light exiting the optical fiber at endface to be tilted relative to an imaging path of the system; a converging element to be optically coupled to the endface and being configured to receive the tilted light and to redirect the tilted light toward the imaging path of the fiber inspection microscope system; and a power detection assembly optically coupled to the converging element, the power detection assembly being configured to detect an optical power associated with the tilted light redirected by the converging element.
    Type: Grant
    Filed: December 8, 2015
    Date of Patent: March 13, 2018
    Assignee: EXFO INC.
    Inventor: Robert Baribault
  • Patent number: 9900087
    Abstract: A multimode launch system to be connected to an Optical Time-Domain Reflectometer (OTDR) for use in performing at least one OTDR measurement on a multi-fiber array Device Under Test (DUT), the multimode launch system comprising: an optical switch being connectable to the OTDR during use; a launch array device having an end being connectable to the optical switch and another end being connectable to the multi-fiber array DUT during use, the launch array device having a plurality of multimode launch optical fibers each having at least one first guidance parameter being smaller than a corresponding one of at least one second guidance parameter of at least one multimode optical fiber of the optical switch; and a multi-fiber mode conditioner along the launch array device for inducing a preferential attenuation of higher-order optical modes of test light propagated into the multi-fiber array DUT during use.
    Type: Grant
    Filed: September 12, 2016
    Date of Patent: February 20, 2018
    Assignee: EXFO INC.
    Inventor: Bernard Ruchet
  • Patent number: 9880359
    Abstract: There is provided an adapter tip to be employed with an optical-fiber inspection microscope probe and an optical-fiber inspection microscope system suitable for imaging the optical-fiber endface of an angled-polished optical-fiber connector deeply recessed within a connector adapter. The adapter tip or microscope system comprises a relay lens system having at least a first relay lens which is disposed so as to directly receive light reflected from the optical-fiber endface during inspection, the lens axis of the first relay lens being offset relative to the optical-fiber endface so as to deviate light reflected from the optical-fiber endface towards the optical-fiber axis of the connector.
    Type: Grant
    Filed: May 20, 2016
    Date of Patent: January 30, 2018
    Assignee: EXFO INC.
    Inventors: Etienne Morin-Drouin, Robert Baribault
  • Patent number: 9858137
    Abstract: A test system and a related method, the system comprising a test processing agent and local test device(s). The test processing agent processes test measurements related to a network-under-test into test results. The test processing agent is decoupled from the network-under-test, e.g., by being reachable through a network communication link distinct from the network-under-test. The local test device comprises a firmware module and a network interface (NI) module. The firmware module depends on external instructions for initiating a test sequence on the network-under-test. The NI module comprises at least one physical port connectable to the network-under-test. The physical port is used for initiating the test sequence. The test processing agent receives the test measurements following the initiation of the test sequence by the local test device and allows access to the test results.
    Type: Grant
    Filed: December 3, 2014
    Date of Patent: January 2, 2018
    Assignee: EXFO Inc.
    Inventors: Dominic Lapierre, Bruno Giguere, Sylvain Nadeau, Gilles Buteau
  • Patent number: 9841579
    Abstract: A fiber inspection system for inspecting optical-fiber endfaces of a multiple-fiber connector is provided that includes a housing structure, a mating interface fixed relative to the housing structure for interfacing with the multiple-fiber connector, and an imaging assembly. The imaging assembly is enclosed in the housing structure and defines an inspection plane and an image plane, at least a plurality of the optical-fiber endfaces being disposed on the inspection plane, to within a focusing range, when the multiple-fiber connector is mated to the mating interface. The imaging assembly also defines an imaging axis between an inspection point on the inspection plane and a detection point on the image plane, and includes an alignment module disposed between the inspection plane and the image plane and controllable to move the inspection point across the inspection plane for selectively inspecting one or more of the optical-fiber endfaces.
    Type: Grant
    Filed: August 26, 2014
    Date of Patent: December 12, 2017
    Assignee: EXFO INC.
    Inventor: Robert Baribault
  • Patent number: 9831948
    Abstract: A passive optical network (PON) device and method for optical power measurement along an optical transmission path supporting bidirectional propagation of downstream light and upstream light between two network elements of a PON is provided. The device includes an optical power splitter assembly extracting respective portions of the upstream and downstream light, and an upstream wavelength analyzer determining, from the extracted upstream light, an upstream spectral characteristic of the upstream light. The device also includes a processing unit determining, based on the upstream spectral characteristic, a downstream spectral characteristic of a downstream signal of interest among a plurality of downstream signals of the downstream light, and a downstream filter assembly filtering the extracted downstream light to select a portion of the downstream signal of interest.
    Type: Grant
    Filed: September 13, 2016
    Date of Patent: November 28, 2017
    Assignee: EXFO INC.
    Inventors: Bernard Ruchet, Mario L'Heureux, Daniel Gariepy
  • Patent number: 9829429
    Abstract: A polarization-related characteristic of an optical path is determined from a predetermined function of the mean-square of a plurality of differences between polarization-analyzed optical power parameters corresponding to pairs of wavelengths mutually spaced about a midpoint wavelength by a small optical frequency difference. At least some of the said differences correspond to wavelength pairs measured under conditions where at least one of midpoint wavelength, input state of polarization (I-SOP) or analyzed state of polarization (A-SOP) of a pair is different.
    Type: Grant
    Filed: February 14, 2013
    Date of Patent: November 28, 2017
    Assignee: EXFO INC
    Inventors: Normand Cyr, Hongxin Chen, Gregory Walter Schinn
  • Patent number: D842144
    Type: Grant
    Filed: August 16, 2017
    Date of Patent: March 5, 2019
    Assignee: EXFO Inc.
    Inventors: Michel Blier, Patrice Gonay, Sebastien Nadeau, Pascal Recoura-Massaquant