公开(公告)号：US10727940B2

公开(公告)日：2020-07-28

申请号：US16445992

申请日：2019-06-19

Applicant: EXFO Inc.

Inventor： Normand Cyr ,  Gang He ,  Bernard Ruchet

IPC: H04B10/00 ,  H04B10/079

Abstract: Method and systems for characterizing an optical signal propagating along a communication link are disclosed. The signal includes a data-carrying signal contribution, modulated at a symbol frequency, and a noise contribution. The method includes measuring an optical power spectrum of the signal, which includes a data-carrying signal spectrum component and a noise spectrum component. The method also includes determining a measured spectral correlation function within pairs of spectral components of the signal as a function of center frequency of the pairs, the spectral components in each pair being spectrally separated from each other by the symbol frequency. The method further includes obtaining a solution for the data-carrying signal spectrum component based on the measured optical power spectrum, such that a calculated spectral correlation function based on the solution matches the measured spectral correlation function. In some embodiments, the spectral correlation function is measured as a low-frequency beatnote amplitude function.

公开(公告)号：US20180131437A1

公开(公告)日：2018-05-10

申请号：US15867938

申请日：2018-01-11

Applicant: EXFO INC.

Inventor： Bernard Ruchet

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

CPC classification number: H04B10/071 ,  G01M11/3136 ,  G01M11/3154 ,  G02B6/14 ,  H04B10/2581

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：US09825700B2

公开(公告)日：2017-11-21

申请号：US15220715

申请日：2016-07-27

Applicant: EXFO INC.

Inventor： Bernard Ruchet ,  Gang He

IPC: H04B10/08 ,  H04B10/079 ,  H04B10/2581 ,  H04B10/071 ,  G01M11/00

CPC classification number: H04B10/07955 ,  G01M11/3145 ,  G01M11/33 ,  H04B10/071 ,  H04B10/2581

Abstract: There is provided a method for measuring an optical power attenuation value of a multimode DUT. The method generally has, using an optical source, propagating test light along a multimode device link having a first multimode device, the multimode DUT and a second multimode device serially connected to one another; said propagating including inducing a preferential attenuation of high-order optical fiber modes of the test light along the first multimode device and along the second multimode device; using an optical power detector, detecting an optical signal resulting from the propagation of the test light along the multimode device link and transmitting an output signal based on the detected optical signal; and using a processor, determining the optical power attenuation value of the multimode DUT based on the output signal.

公开(公告)号：US09733616B2

公开(公告)日：2017-08-15

申请号：US14368625

申请日：2012-12-21

Applicant: EXFO INC.

Inventor： Bernard Ruchet ,  Normand Cyr

IPC: G01B9/021 ,  G03H1/08 ,  G02B6/38 ,  G02B21/00 ,  G01N21/94 ,  G01M11/08

CPC classification number: G03H1/0866 ,  G01B9/021 ,  G01M11/088 ,  G01N21/94 ,  G01N2201/0627 ,  G02B6/385 ,  G02B21/0016

Abstract: A portable inspection probe for the inspection of a recessed mating surface of an optical fiber connector is provided. In one variant, the portable inspection probe includes a digital holographic detection module operable to digitally record a hologram of the recessed mating surface, and a rigid probe tip configured to be optically coupled to the digital holographic detection module and shaped to provide optical access to the recessed mating surface. In another variant, the portable inspection probe is to be used with a rigid probe tip connectable thereto, and the digital holographic detection module includes a probing optical assembly not traversed by a reference beam and configured to direct an object beam onto the recessed mating surface and to collect the object beam upon reflection thereof by the recessed mating surface. An inspection system and an inspection method are also provided.

公开(公告)号：US20160218802A1

公开(公告)日：2016-07-28

申请号：US14966628

申请日：2015-12-11

Applicant: EXFO INC.

Inventor： Bernard Ruchet ,  Gang He

IPC: H04B10/079

CPC classification number: H04B10/07955 ,  G01M11/33

Abstract: There is provided a method for measuring an optical power attenuation value of a multimode DUT. The method generally has, using an optical source, propagating test light along a multimode device link having a first multimode device, the multimode DUT and a second multimode device serially connected to one another; said propagating including inducing a preferential attenuation of high-order optical fiber modes of the test light along the first multimode device and along the second multimode device; using an optical power detector, detecting an optical signal resulting from the propagation of the test light along the multimode device link and transmitting an output signal based on the detected optical signal; and using a processor, determining the optical power attenuation value of the multimode DUT based on the output signal.

Abstract translation: 提供了一种用于测量多模DUT的光功率衰减值的方法。 该方法通常使用光源，沿着具有第一多模器件的多模器件链路传播测试光，多模DUT和彼此串联连接的第二多模器件; 所述传播包括沿第一多模设备和沿第二多模设备诱导测试光的高阶光纤模式的优先衰减; 使用光功率检测器，检测由沿着多模设备链路的测试光的传播而产生的光信号，并且基于检测到的光信号发送输出信号; 以及使用处理器，基于所述输出信号确定所述多模DUT的光功率衰减值。

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：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：US09654213B2

公开(公告)日：2017-05-16

申请号：US15069365

申请日：2016-03-14

Applicant: EXFO Inc.

Inventor： Bernard Ruchet ,  Normand Cyr

IPC: H04J14/00 ,  H04B10/079 ,  H04B3/46 ,  H04Q11/00

CPC classification number: H04B10/07955 ,  H04B3/46 ,  H04B10/079 ,  H04B10/0793 ,  H04B10/0795 ,  H04B10/07953 ,  H04Q11/0067 ,  H04Q2011/0083

Abstract: A portable apparatus for measuring optical powers of optical signals propagating concurrently in opposite directions in an optical transmission path between two elements, at least one of the elements being operative to transmit a first optical signal (S1) only if it continues to receive a second optical signal (S2) from the other of said elements, comprises first and second connector means for connecting the apparatus into the optical transmission path in series therewith, and propagating and measuring means connected between the first and second connector means for propagating at least the second optical signal (S2) towards the one of the elements, and measuring the optical powers of the concurrently propagating optical signals (S1, S2). The measurement results may be displayed by a suitable display unit. Where one element transmits signals at two different wavelengths, the apparatus may separate parts of the corresponding optical signal portion according to wavelength and process them separately.

公开(公告)号：US20140363157A1

公开(公告)日：2014-12-11

申请号：US14468890

申请日：2014-08-26

Applicant: EXFO Inc.

Inventor： Bernard Ruchet ,  Normand Cyr

IPC: H04B10/079 ,  H04Q11/00 ,  H04B3/46

CPC classification number: H04B10/07955 ,  H04B3/46 ,  H04B10/079 ,  H04B10/0793 ,  H04B10/0795 ,  H04B10/07953 ,  H04Q11/0067 ,  H04Q2011/0083

Abstract: A portable apparatus for measuring parameters of optical signals propagating concurrently in opposite directions in an optical transmission path between two elements, at least one of the elements being operative to transmit a first optical signal (S1) only if it continues to receive a second optical signal (S2) from the other of said elements, comprises first and second connector means for connecting the apparatus into the optical transmission path in series therewith, and propagating and measuring means connected between the first and second connector means for propagating at least the second optical signal (S2) towards the one of the elements, and measuring the parameters of the concurrently propagating optical signals (S1, S2). The measurement results may be displayed by a suitable display unit. Where one element transmits signals at two different wavelengths, the apparatus may separate parts of the corresponding optical signal portion according to wavelength and process them separately.

Abstract translation: 一种用于测量在两个元件之间的光传输路径中以相反方向同时传播的光信号的参数的便携式设备，所述元件中的至少一个仅在其继续接收第二光信号时才发送第一光信号（S1） （S2）包括用于将设备串联连接到光传输路径中的第一和第二连接器装置，以及连接在第一和第二连接器装置之间的传播和测量装置，用于至少传播第二光信号 （S2），并且测量同时传播的光信号（S1，S2）的参数。 测量结果可以由合适的显示单元显示。 当一个元件以两个不同的波长发射信号时，该装置可以根据波长分离对应的光信号部分的部分并分别处理它们。

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.