公开(公告)号：US20190245641A1

公开(公告)日：2019-08-08

申请号：US16388367

申请日：2019-04-18

Applicant: EXFO Inc.

Inventor： Bernard RUCHET ,  Mario L'HEUREUX ,  Daniel GARIEPY ,  Etienne MORIN-DROUIN

IPC: H04J14/02 ,  H04B10/079

CPC classification number: H04J14/02 ,  H04B10/07955 ,  H04J14/0221

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.

公开(公告)号：US10270554B2

公开(公告)日：2019-04-23

申请号：US15822339

申请日：2017-11-27

Applicant: EXFO INC.

Inventor： Bernard Ruchet ,  Mario L'Heureux ,  Daniel Gariepy ,  Etienne Morin-Drouin

IPC: H04B17/00 ,  H04J14/02 ,  H04B10/079

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. The device further includes a processing unit configured to identify, based on the upstream spectral characteristic, the downstream signal of interest among the downstream filtered signals, and a downstream optical power meter assembly coupled to the downstream filter assembly and configured to measure an optical power parameter of the downstream signal of interest.

公开(公告)号：US10200118B2

公开(公告)日：2019-02-05

申请号：US15867938

申请日：2018-01-11

Applicant: EXFO INC.

Inventor： Bernard Ruchet

IPC: H04B10/071 ,  H04B10/2581 ,  G01M11/00 ,  G02B6/14

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.

公开(公告)号：US10175142B2

公开(公告)日：2019-01-08

申请号：US15193180

申请日：2016-06-27

Applicant: EXFO INC.

Inventor： Denis Lafrance ,  Bernard Ruchet ,  Robert Baribault

IPC: G01N21/00 ,  G01M11/00 ,  G06T7/00 ,  H04N5/225 ,  H04B10/00 ,  G02B6/38 ,  G02B21/00

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.

公开(公告)号：US10128975B2

公开(公告)日：2018-11-13

申请号：US14931983

申请日：2015-11-04

Applicant: EXFO INC.

Inventor： Gang He ,  Daniel Gariepy

IPC: H04J14/06 ,  H04B10/079 ,  H04B10/077

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.

公开(公告)号：US10018785B2

公开(公告)日：2018-07-10

申请号：US14301646

申请日：2014-06-11

Applicant: EXFO Inc.

Inventor： Remi Fortin ,  Gang He

IPC: G02B6/00 ,  G02B6/26 ,  G02B6/028 ,  G02B6/14

CPC classification number: G02B6/268 ,  G02B6/0281 ,  G02B6/0288 ,  G02B6/14

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.

公开(公告)号：US09954610B2

公开(公告)日：2018-04-24

申请号：US14932375

申请日：2015-11-04

Applicant: EXFO INC.

Inventor： Gang He ,  Daniel Gariepy

IPC: H04B10/079

CPC classification number: H04B10/07953

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.

公开(公告)号：US09880359B2

公开(公告)日：2018-01-30

申请号：US15160398

申请日：2016-05-20

Applicant: EXFO Inc.

Inventor： Etienne Morin-Drouin ,  Robert Baribault

IPC: G01N21/00 ,  G02B6/36 ,  G01M11/00 ,  G02B6/38 ,  F21V8/00

CPC classification number: G02B6/3628 ,  G01M11/31 ,  G02B6/0006 ,  G02B6/385

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.

公开(公告)号：USD798171S1

公开(公告)日：2017-09-26

申请号：US29547809

申请日：2015-12-08

Applicant: EXFO INC.

Designer： Michel Blier ,  Patrice Gonay ,  Sebastien Nadeau ,  Pascal Recoura-Massaquant

公开(公告)号：US20170085318A1

公开(公告)日：2017-03-23

申请号：US15263986

申请日：2016-09-13

Applicant: EXFO INC.

Inventor： Bernard RUCHET ,  Mario L'HEUREUX ,  Daniel GARIEPY

IPC: H04B10/079 ,  H04J14/02 ,  H04B10/27

CPC classification number: H04B10/07955 ,  H04B10/079 ,  H04B10/27 ,  H04J14/0221

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. The device further includes a downstream optical power meter assembly measuring an optical power parameter of the selected portion of the downstream signal of interest.