公开(公告)号：US09831948B2

公开(公告)日：2017-11-28

申请号：US15263986

申请日：2016-09-13

Applicant: EXFO INC.

Inventor： Bernard Ruchet ,  Mario L'Heureux ,  Daniel Gariepy

IPC: H04B17/00 ,  H04B10/079 ,  H04B10/27 ,  H04J14/02

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.

公开(公告)号：US10574378B2

公开(公告)日：2020-02-25

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: H04B10/079 ,  H04J14/02

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：US09596027B2

公开(公告)日：2017-03-14

申请号：US14268144

申请日：2014-05-02

Applicant: EXFO Inc.

Inventor： Gang He ,  Daniel Gariepy ,  Mats Skold

IPC: H04B10/079 ,  H04J14/06

CPC classification number: H04B10/07953 ,  H04J14/06

Abstract: There is provided a method and an apparatus for determining quality parameters on a polarization-multiplexed optical signal based on an analysis of the power spectral density of the Signal-Under-Test (SUT). The method is predicated upon knowledge of the spectral shape of the signal in the absence of significant noise or spectral deformation. This knowledge is provided by a reference optical spectrum trace. Based on this knowledge and under the assumption that ASE noise level is approximately constant in wavelength over a given spectral range, the spectral deformation of the signal contribution of the SUT may be estimated using a comparison of the spectral variations of the optical spectrum trace of the SUT with that of the reference optical spectrum trace.

Abstract translation: 提供了一种基于对测试信号（SUT）的功率谱密度的分析来确定偏振复用光信号质量参数的方法和装置。 该方法基于在没有显着噪声或光谱变形的情况下对信号的光谱形状的了解。 该知识由参考光谱轨迹提供。 基于这一知识，并假设ASE噪声水平在给定光谱范围内的波长近似恒定，则SUT的信号贡献的光谱变形可以使用光谱轨迹的光谱变化的比较来估计 SUT与参考光谱图谱相同。

公开(公告)号：US11595125B2

公开(公告)日：2023-02-28

申请号：US17183415

申请日：2021-02-24

Applicant: EXFO Inc.

Inventor： Gang He ,  Daniel Gariepy

IPC: H04B17/00 ,  H04B10/079 ,  H04B10/073

Abstract: There is herein provided a method for measuring the GOSNR that can be implemented using commercial-grade transceivers and which accounts for linear optical impairments (e.g. PMD, PDL and CD) and transceiver intrinsic impairments. The method may be implemented using an Optical Spectrum Analyzer (OSA) and either the system transceivers or other commercial-grade transceivers. The proposed measurement method is based on mixed optical and electronic technologies, using an OSA and a transceiver pair. By measuring a signal quality metric Qm and the OSNR under varied power and ASE noise conditions, a constant value RBW that relates the GOSNR to the signal quality metric Qm is derived. The GOSNR is then obtained from these results.

公开(公告)号：US20130330071A1

公开(公告)日：2013-12-12

申请号：US13965823

申请日：2013-08-13

Applicant: EXFO INC.

Inventor： Gang He ,  Daniel Gariepy ,  Hongxin Chen ,  Bernard Ruchet

IPC: H04B10/073

CPC classification number: H04B10/073 ,  H04B10/0775 ,  H04B10/07953 ,  H04J14/02 ,  H04J14/06

Abstract: There is provided a method for determining a noise parameter characterizing an optical Signal-Under-Test (SUT) having a signal contribution, an Amplified Spontaneous Emission (ASE) noise contribution and a non-ASE optical noise contribution, such as a carrier-leakage contribution or a depolarized-signal contribution, within an optical-signal bandwidth. The method comprises acquiring optical spectrum trace(s) of the SUT, discriminating at least the non-ASE optical noise contribution from the ASE-noise contribution using the optical spectrum trace(s) and/or a trace obtained from the optical spectrum trace(s); and determining the noise parameter using discriminated non-ASE optical noise contribution and/or the discriminated ASE-noise contribution.

Abstract translation: 提供了一种用于确定表征具有信号贡献，放大自发发射（ASE）噪声贡献和非ASE光学噪声贡献的光信号不足（SUT）的噪声参数的方法，例如载波泄漏 贡献或去极化信号贡献，在光信号带宽内。 该方法包括获取SUT的光谱轨迹，使用光谱轨迹和/或从光谱轨迹获得的轨迹来区分来自ASE-噪声贡献的至少非ASE光学噪声贡献（和 s）; 以及使用鉴别的非ASE光学噪声贡献和/或所识别的ASE-噪声贡献来确定噪声参数。

公开(公告)号：US10591385B2

公开(公告)日：2020-03-17

申请号：US15950709

申请日：2018-04-11

Applicant: EXFO Inc.

Inventor： Stephane Perron ,  Daniel Gariepy ,  Nicolas Caron ,  Robert Baribault ,  Vincent Racine

IPC: G01M11/00 ,  G02B6/38 ,  H04B10/073

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.

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：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：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：US09438336B2

公开(公告)日：2016-09-06

申请号：US13965823

申请日：2013-08-13

Applicant: EXFO INC.

Inventor： Gang He ,  Daniel Gariepy ,  Hongxin Chen ,  Bernard Ruchet

IPC: H04B10/073 ,  H04J14/02 ,  H04J14/06 ,  H04B10/079

CPC classification number: H04B10/073 ,  H04B10/0775 ,  H04B10/07953 ,  H04J14/02 ,  H04J14/06

Abstract: There is provided a method for determining a noise parameter characterizing an optical Signal-Under-Test (SUT) having a signal contribution, an Amplified Spontaneous Emission (ASE) noise contribution and a non-ASE optical noise contribution, such as a carrier-leakage contribution or a depolarized-signal contribution, within an optical-signal bandwidth. The method comprises acquiring optical spectrum trace(s) of the SUT, discriminating at least the non-ASE optical noise contribution from the ASE-noise contribution using the optical spectrum trace(s) and/or a trace obtained from the optical spectrum trace(s); and determining the noise parameter using discriminated non-ASE optical noise contribution and/or the discriminated ASE-noise contribution.

Abstract translation: 提供了一种用于确定表征具有信号贡献，放大自发发射（ASE）噪声贡献和非ASE光学噪声贡献的光信号不足（SUT）的噪声参数的方法，例如载波泄漏 贡献或去极化信号贡献，在光信号带宽内。 该方法包括获取SUT的光谱轨迹，使用光谱轨迹和/或从光谱轨迹获得的轨迹来区分来自ASE-噪声贡献的至少非ASE光学噪声贡献（和 s）; 以及使用鉴别的非ASE光学噪声贡献和/或所识别的ASE-噪声贡献来确定噪声参数。