公开(公告)号：US20180076890A1

公开(公告)日：2018-03-15

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: H04B10/079 ,  H04J14/02 ,  H04B10/27 ,  H04B10/67 ,  H04B10/077

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. 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：US20160142135A1

公开(公告)日：2016-05-19

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.

Abstract translation: 提供了用于确定表征光通信信号的质量参数的方法和装置，所述方法由信号检测装置执行。 在发送端，获得第一光信号的信号功率P1，第二光信号的信号功率P2，第三光信号的信号功率P3，可选地是第四光信号的信号功率P4，以及 第一，第二，第三和任选的第四光信号所在的信道的总信号功率Ps。 在检测点，进一步获得第一光信号的信号功率P1'，第二光信号的信号功率P2'，第三光信号的信号功率P3'以及可选地的第三光信号的信号功率P4' 第四光信号。 然后从获得的信号功率确定信号变形因子SDF和/或光信号对ASE噪声比OSNR。

公开(公告)号：US20210273722A1

公开(公告)日：2021-09-02

申请号：US17183415

申请日：2021-02-24

Applicant: EXFO Inc.

Inventor： Gang HE ,  Daniel GARIEPY

IPC: 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：US20190170610A1

公开(公告)日：2019-06-06

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

CPC classification number: G01M11/33 ,  G02B6/385 ,  G02B6/3885 ,  H04B10/0731

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：US20140328586A1

公开(公告)日：2014-11-06

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：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：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.

公开(公告)号：US20160127074A1

公开(公告)日：2016-05-05

申请号：US14931983

申请日：2015-11-04

Applicant: EXFO INC.

Inventor： Gang HE ,  Daniel GARIEPY

IPC: H04J14/06 ,  H04B10/079

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

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.

Abstract translation: 提供了一种在偏振复用信号上区分NLE诱发的信号变形与ASE噪声的方法，以便在NLE条件下测量OSNR和/或表征NLE引起的信号变形。 根据一个方面，该方法基于当（数据携带）光通信信号被部分或完全熄灭（仅限于ASE噪声）以及带有实时光通信信号时获取光谱踪迹。 比较采用不同条件和/或不同日期的踪迹可以区分信号贡献，ASE噪声贡献和NLE引起的SUT变形。