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：US09858137B2

公开(公告)日：2018-01-02

申请号：US14558773

申请日：2014-12-03

Applicant: EXFO INC.

Inventor： Dominic Lapierre ,  Bruno Giguere ,  Sylvain Nadeau ,  Gilles Buteau

IPC: G06F11/00 ,  G06F11/07 ,  G06F11/22

CPC classification number: G06F11/079 ,  G06F11/2294 ,  H04L43/50

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.

公开(公告)号：US09749043B2

公开(公告)日：2017-08-29

申请号：US14941759

申请日：2015-11-16

Applicant: EXFO INC.

Inventor： Stephane Perron

IPC: H04B10/079 ,  G01M11/00

CPC classification number: H04B10/07955 ,  G01M11/33

Abstract: The computer readable memory has recorded thereon instruction code for execution by a computing device for use with an optical power loss measurement (OPLM) system. The instruction code generally comprises: code for displaying a first set of instructions including measuring a first power value of test light outputted from a first reference optical waveguide; code for displaying a second set of instructions including measuring a second power value of test light outputted from a reference waveguide link including the first reference optical waveguide connected in series to a second reference optical waveguide; code for displaying a third set of instructions including measuring a reference power value of the OPLM system resulting from the propagation of light from via the reference waveguide link; and code for determining a corrected reference power value based on the reference power value and on the first and second power values.

公开(公告)号：US20170234767A1

公开(公告)日：2017-08-17

申请号：US15427474

申请日：2017-02-08

Applicant: EXFO INC.

Inventor： Michel Leclerc ,  Mario L'Heureux ,  Stephane Perron

IPC: G01M11/00

CPC classification number: G01M11/3136 ,  G01M11/3145 ,  G01M11/3154

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.

公开(公告)号：US20170149496A1

公开(公告)日：2017-05-25

申请号：US15427486

申请日：2017-02-08

Applicant: EXFO INC.

Inventor： Stéphane Perron ,  Michel Leblanc

IPC: H04B10/071 ,  G01M11/00

CPC classification number: H04B10/071 ,  G01M11/3127 ,  G01M11/3136 ,  G01M11/3145

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.

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：US09506838B2

公开(公告)日：2016-11-29

申请号：US14820707

申请日：2015-08-07

Applicant: EXFO INC.

Inventor： Mario L'Heureux ,  Michel Leclerc ,  Eric Thomassin ,  Stephane Perron

IPC: G01N21/00 ,  G01M11/00

CPC classification number: G01M11/3145 ,  G01M11/3109 ,  G01M11/3118 ,  G01M11/39

Abstract: There is provided a bi-directional optical reflectometric method for characterizing an optical fiber link. The method comprises: performing at least one forward-direction light acquisition from one end of the optical fiber link and performing at least one backward-direction light acquisition from the opposite end, wherein each light acquisition is performed by propagating at least one test light signal corresponding to given spatial resolution and detecting corresponding return light so as to obtain a reflectometric trace representing backscattered and reflected light as a function of a distance on the optical fiber link, and wherein said forward-direction light acquisition and said backward-direction light acquisition are performed with mutually different spatial resolutions; and deriving a value of at least one parameter characterizing an event at a location along said optical fiber link at least using the forward-direction light acquisition and the backward-direction light acquisition performed with mutually different spatial resolutions.

Abstract translation: 提供了用于表征光纤链路的双向光学反射测量方法。 该方法包括：从光纤链路的一端执行至少一个正向光采集，并从相对端执行至少一个反向光采集，其中每个光采集通过传播至少一个测试光信号 对应于给定的空间分辨率并检测相应的返回光，以获得表示作为光纤链路上的距离的函数的反向散射和反射光的反射光线，其中所述前向光获取和所述反向光获取是 以相互不同的空间分辨率进行; 以及至少使用以相互不同的空间分辨率执行的前向光采集和反向光采集，沿着所述光纤链路的位置导出表征事件的至少一个参数的值。

公开(公告)号：US09423316B2

公开(公告)日：2016-08-23

申请号：US14092227

申请日：2013-11-27

Applicant: EXFO Inc.

Inventor： Stephane Perron ,  Michel Leclerc

IPC: G01N21/00 ,  G01M11/00

CPC classification number: G01M11/3145 ,  G01M11/3118

Abstract: There is provided an optical reflectometric method and system for characterizing an optical fiber link, wherein events in the fiber optic link under test are identified and values of parameters characterizing the events (e.g. location, insertion loss and reflectance) are extracted from an analysis of one or more reflectometric measurements performed on the optical fiber link. A loss profile and/or a reflectance profile are then constructed. The loss and reflectance profiles are typically displayed on screen or otherwise graphically represented for an operator to be able to appreciate the measurement results at a single glance.

Abstract translation: 提供了用于表征光纤链路的光学反射测量方法和系统，其中识别被测光纤链路中的事件，并且从一个分析中提取表征事件（例如位置，插入损耗和反射率）的参数值 或更多的反射测量在光纤链路上执行。 然后构造损耗曲线和/或反射率分布。 损耗和反射率分布通常显示在屏幕上，或以其它方式表示为操作者，以便能够一目了然地了解测量结果。

公开(公告)号：US20160202418A1

公开(公告)日：2016-07-14

申请号：US14301646

申请日：2014-06-11

Applicant: EXFO Inc.

Inventor： Remi FORTIN ,  Gang HE

IPC: G02B6/26 ,  G02B6/028

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.

Abstract translation: 提供了一种模式分配调节器，其包括芯棒包裹的光纤和可调节和可固定的光纤环路的组合。 注意到，与目标环绕通量函数（如标准所定义）相比，进入模态分布调节器的光通常被过度填充。 心轴缠绕将宏弯引入光纤，诱导模态预过滤，粗略地将初始过度填充的模态分布转化为接近于符合相应标准。 然而，穿过固定心轴的光的模态分布通常保持有些过度填充。 可调节环路根据标准对模态分布进行微调。 一旦满足标准规定的要求，可调节环路可以固定就位，使得模态分布变得固定并保持稳定。

公开(公告)号：US20160013860A1

公开(公告)日：2016-01-14

申请号：US14860277

申请日：2015-09-21

Applicant: EXFO INC.

Inventor： Stéphane Perron ,  Michel Leblanc

IPC: H04B10/071 ,  G01M11/00

CPC classification number: H04B10/071 ,  G01M11/3127 ,  G01M11/3136 ,  G01M11/3145

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.