公开(公告)号：US09170173B2

公开(公告)日：2015-10-27

申请号：US14044768

申请日：2013-10-02

Applicant: EXFO INC.

Inventor： Stéphane Perron ,  Michel Leblanc

IPC: G01N21/00 ,  G01M11/00 ,  H04B10/071

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.

Abstract translation: 提供了用于表征光纤链路中的一个或多个事件的OTDR设备和方法。 进行多次光采集。 对于每个光采集，测试光脉冲在光纤链路中传播，并且检测来自光纤链路的相应返回光信号。 光采集在不同的采集条件下进行，例如使用不同的脉冲宽度或波长。 使用来自多个光采集中的至少两个的检测到的返回信号导出表征事件的参数。

公开(公告)号：USD739429S1

公开(公告)日：2015-09-22

申请号：US29455936

申请日：2013-05-28

Applicant: EXFO INC.

Designer： Steve Veilleux ,  Jean-Francois Drolet ,  Stephane Houde ,  François Morissette ,  Francis Audet ,  Pascal Bouchard

公开(公告)号：US09106334B2

公开(公告)日：2015-08-11

申请号：US14273652

申请日：2014-05-09

Applicant: EXFO Inc.

Inventor： Mathias Westlund ,  Henrik Sunnerud

IPC: H04B10/073 ,  H04B10/61

CPC classification number: H04B10/0731 ,  H04B10/614

Abstract: There are provided a method and a system for characterizing the CMRR of an ICR under test, which employ highly coherent light from two continuous-wave (CW) single-frequency lasers whose respective optical frequencies mutually differ by an offset defining an “Intermediate Frequency” (fIF) in the rf electrical baseband. The method involves the coherent mixing of light from these two lasers in the ICR under test. A “tone” in the rf electrical baseband at frequency fIF is generated by the beating of light from the two single-frequency lasers as they interfere on the photodetectors of the ICR. The resulting tone at frequency fIF in the output electrical signals of the ICR is then detected and analyzed to characterize the CMRR of the ICR.

Abstract translation: 提供了一种用于表征正在测试的ICR的CMRR的方法和系统，其使用来自两个连续波（CW）单频激光器的高度相干的光，其相应的光频率相互限定“中间频率” （fIF）在rf电基带。 该方法涉及在被测试的ICR中来自这两个激光器的光的相干混合。 频率为fIF的RF电基带中的“音调”通过来自两个单频激光器的光的抖动产生，因为它们干扰ICR的光电检测器。 然后检测和分析ICR的输出电信号中频率fIF产生的音调，以表征ICR的CMRR。

公开(公告)号：US20150177469A1

公开(公告)日：2015-06-25

申请号：US14571808

申请日：2014-12-16

Applicant: EXFO Inc.

Inventor： Sebastien Nadeau

IPC: G02B6/42 ,  G01M11/00

CPC classification number: G02B6/385 ,  G01M11/3154 ,  G02B6/4292

Abstract: There is provided a mating assembly for mating a fiber-optic termination comprising a fiber-optic ferrule to an optical test instrument. The mating assembly comprises: a holding body having internal tubular dimensions substantially complementary to corresponding external dimensions of the fiber-optic ferrule of said fiber-optic termination, to hold the fiber-optic ferrule in a given alignment relative to the optical test instrument; and at least one deformable elastomeric feature extending inwardly in the holding body to frictionally engage on a smooth external surface of said fiber-optic ferrule and to provide friction thereon to retain said fiber-optic ferrule.

Abstract translation: 提供了一种用于将包括光纤套圈的光纤终端与光学测试仪器配合的配合组件。 配合组件包括：保持体，其具有与所述光纤终端的光纤套圈的相应外部尺寸基本上互补的内部管状尺寸，以相对于光学测试仪器以给定的对准保持光纤套圈; 以及至少一个在保持体内向内延伸的可变形弹性体特征，以摩擦地接合在所述光纤套圈的平滑的外表面上，并在其上提供摩擦以保持所述光纤套圈。

公开(公告)号：US20140341564A1

公开(公告)日：2014-11-20

申请号：US14273652

申请日：2014-05-09

Applicant: EXFO Inc.

Inventor： Mathias WESTLUND ,  Henrik SUNNERUD

IPC: H04B10/073 ,  H04B10/64 ,  H04B10/61

CPC classification number: H04B10/0731 ,  H04B10/614

Abstract: There are provided a method and a system for characterizing the CMRR of an ICR under test, which employ highly coherent light from two continuous-wave (CW) single-frequency lasers whose respective optical frequencies mutually differ by an offset defining an “Intermediate Frequency” (fIF) in the rf electrical baseband. The method involves the coherent mixing of light from these two lasers in the ICR under test. A “tone” in the rf electrical baseband at frequency fIF is generated by the beating of light from the two single-frequency lasers as they interfere on the photodetectors of the ICR. The resulting tone at frequency fIF in the output electrical signals of the ICR is then detected and analyzed to characterize the CMRR of the ICR.

Abstract translation: 提供了一种用于表征正在测试的ICR的CMRR的方法和系统，其使用来自两个连续波（CW）单频激光器的高度相干的光，其相应的光频率相互限定“中间频率” （fIF）在rf电基带。 该方法涉及在被测试的ICR中来自这两个激光器的光的相干混合。 频率为fIF的RF电基带中的“音调”通过来自两个单频激光器的光的抖动产生，因为它们干扰ICR的光电检测器。 然后检测和分析ICR的输出电信号中频率fIF产生的音调，以表征ICR的CMRR。

公开(公告)号：US20140198311A1

公开(公告)日：2014-07-17

申请号：US14014606

申请日：2013-08-30

Applicant: EXFO INC.

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

IPC: 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 a plurality of forward-direction light acquisitions from one end of the optical fiber link and performing a plurality of backward-direction light acquisitions 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 plurality of forward-direction light acquisitions and said plurality of backward-direction light acquisitions are each performed with mutually different spatial resolutions; and deriving a value of at least one parameter characterizing an event along said optical fiber link at least using a forward-direction light acquisition and a 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多个正向光采集，并从相对端执行多个反向光采集，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，以便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迹，并且其中所述多个正向光采集和所述多个向后光取样， 方向光采集各自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，沿着所述光纤链路导出表征事件的至少一个参数的值。

公开(公告)号：US20140037285A1

公开(公告)日：2014-02-06

申请号：US14044768

申请日：2013-10-02

Applicant: EXFO INC.

Inventor： Stéphane Perron ,  Michel Leblanc

IPC: H04B10/071

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.

Abstract translation: 提供了用于表征光纤链路中的一个或多个事件的OTDR设备和方法。 进行多次光采集。 对于每个光采集，测试光脉冲在光纤链路中传播，并且检测来自光纤链路的相应返回光信号。 光采集在不同的采集条件下进行，例如使用不同的脉冲宽度或波长。 使用来自多个光采集中的至少两个的检测到的返回信号导出表征事件的参数。

公开(公告)号：US20250146904A1

公开(公告)日：2025-05-08

申请号：US18777215

申请日：2024-07-18

Applicant: EXFO Inc.

Inventor： Michel LECLERC ,  Hongxin CHEN

IPC: G01M11/00

Abstract: There is provided a chromatic dispersion measurement method and system for characterizing an optical fiber link under test. From a proximal end of the optical fiber link, at least one OTDR acquisition is performed, wherein each OTDR acquisition is performed by propagating in the optical fiber link under test, at least one test signal comprising a plurality of light pulses in accordance with a known sequence of pulses and detecting corresponding return light signal from the optical fiber link so as to obtain a trace representing backscattered and reflected light as a function of distance in the optical fiber link under test, and wherein said test signals have mutually different wavelengths. For each test signal and corresponding wavelength, a position of the reflective peak associated with a remote end of the optical fiber link is extracted from the return light signal by calculating a cross-correlation between the known sequence of pulses and the acquired trace. A value of a chromatic dispersion coefficient associated with said optical fiber link is then calculated from values of the extracted positions and corresponding wavelengths.

公开(公告)号：US20250035510A1

公开(公告)日：2025-01-30

申请号：US18773248

申请日：2024-07-15

Applicant: EXFO Inc.

Inventor： Hongxin CHEN ,  Yves BRETON ,  Mathieu HUNEAULT

IPC: G01M11/00

Abstract: There is provided a method of measuring the PMD of an optical fiber under test (FUT). A polarization-sensitive optical time domain reflectometer (POTDR) is used to inject into the FUT and from a proximal end thereof, a test signal comprising a series of repeated light pulses and detecting a corresponding polarization-analyzed return light signal coming back from the optical fiber and representing back-reflected light from a light reflector connected to a distal end of the FUT, said return light signal comprising repeated reflected light pulses. The plurality of polarization-sensitive acquisitions defines at least one pair of acquisitions performed with mutually different but closely-spaced wavelengths and substantially the same state of polarization (SOP), a center of said wavelengths defining a center wavelength for said at least one pair. The process may be repeated for a plurality of pairs of acquisitions performed with at least one of a plurality of mutually-different center wavelengths and a plurality of mutually-different states of polarization (SOP). For each said acquisitions, respective amplitudes of at least part of the repeated reflected light pulses are averaged so as to obtain an averaged reflected power. The PMD is obtained by, for each said pairs of said acquisitions, computing a value of a difference between the two averaged reflected powers corresponding to said pair, followed by the mean-square value of computed values of difference over said at least one of a plurality of mutually-different center wavelengths and a plurality of mutually-different states of polarizations (SOPs) and, from said mean-square value, calculating a value of the PMD for the optical fiber under test.

公开(公告)号：US20250035509A1

公开(公告)日：2025-01-30

申请号：US18778052

申请日：2024-07-19

Applicant: EXFO Inc.

Inventor： Michel Leclerc ,  Mario L’Heureux

IPC: G01M11/00 ,  G01M11/02

Abstract: Systems, methods, and devices for testing optical fibers are provided. According to one implementation, an optical fiber testing apparatus may include an optical test unit configured to obtain a characterization of an optical fiber to be tested. Additionally, the optical fiber testing apparatus may include a visible light source and an analysis and control device. For example, the analysis and control device may be configured to adapt the visible light source to a specific power level based on the characterization of the optical fiber.