公开(公告)号：US20190386753A1

公开(公告)日：2019-12-19

申请号：US16159013

申请日：2018-10-12

Applicant: EXFO Inc.

Inventor： Jean-Sébastien Martel ,  Stéphane Perron

IPC: H04B17/15 ,  H04B17/29 ,  H04B10/071 ,  H04B10/2575

Abstract: Fronthaul monitoring systems and methods include a Radio Frequency (RF) analysis module configured to receive an optical RF signal for RF testing thereof; a fiber monitoring module configured to perform fiber monitoring testing; an optical switch configured to switch a port connected to the RF analysis module and the fiber monitoring module between one or more Remote Radio Heads (RRH); and a test coordinator software module configured to coordinate the RF testing and the fiber monitoring testing. The optical RF signal is at different wavelengths than a fiber test signal for the fiber monitoring testing, such that the RF testing and the fiber monitoring testing can be performed concurrently.

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：US09900087B2

公开(公告)日：2018-02-20

申请号：US15263036

申请日：2016-09-12

Applicant: EXFO INC.

Inventor： Bernard Ruchet

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

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：US20170237800A1

公开(公告)日：2017-08-17

申请号：US15255199

申请日：2016-09-02

Applicant: EXFO Inc.

Inventor： David Carruthers

IPC: H04L29/08 ,  G06F11/30 ,  G06F3/0484

Abstract: System and method for communicating with and controlling a test device. Receiving user input via a system GUI to start a test. In response to the user input, providing by the communication controller a display URL of a resource associated with the test device. Displaying content of the resource nested within the system GUI by a browser. Sending a start instruction to start a test to the test device. Receiving by the communication controller test data from the test device and one of displaying an indication of the test data in the system GUI and storing the test data.

公开(公告)号：US09673899B2

公开(公告)日：2017-06-06

申请号：US14223165

申请日：2014-03-24

Applicant: EXFO INC.

Inventor： Henrik Sunnerud ,  Mats Skold ,  Mathias Westlund

IPC: H04J14/06 ,  H04B10/079

CPC classification number: H04B10/07953 ,  H04J14/06

Abstract: There is provided a system and a method for determining an in-band noise parameter representative of the optical noise contribution (such as OSNR) on a polarization-multiplexed optical Signal-Under-Test (SUT) comprising two polarized phase-modulated data-carrying contributions and an optical noise contribution. For each of a multiplicity of distinct polarization-analyzer conditions, the SUT is analyzed to provide at least one polarization-analyzed component of the SUT and the polarization-analyzed component is detected with an electronic bandwidth at least ten times smaller than the symbol rate of the SUT to obtain a corresponding acquired electrical signal; for each acquired electrical signal, a value of a statistical parameter is determined from the ac component of the acquired electrical signal, thereby providing a set of statistical-parameter values corresponding to the multiplicity of distinct polarization-analyzer conditions; and, from the set of statistical-parameter values, the in-band noise parameter is mathematically determined.

公开(公告)号：US20160337034A1

公开(公告)日：2016-11-17

申请号：US15220715

申请日：2016-07-27

Applicant: EXFO INC.

Inventor： Bernard Ruchet ,  Gang He

IPC: H04B10/079 ,  H04B10/071 ,  H04B10/2581

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：US20160248499A1

公开(公告)日：2016-08-25

申请号：US15050146

申请日：2016-02-22

Applicant: EXFO INC.

Inventor： Stéphane Perron

IPC: H04B10/079 ,  H04B10/071

CPC classification number: H04B10/071

Abstract: A safe-mode OTDR method for characterizing an optical fiber link is provided, as well as an OTDR apparatus operating under such a safe mode. The method includes performing OTDR acquisitions along the fiber link using an OTDR apparatus connected at a proximal end of the optical fiber link, and operating under OTDR acquisition conditions that have been deemed safe for a communication device at a distal end of the fiber link. The obtained reflectometric trace, representing a proximal portion of the optical fiber link, is used to determine a partial-link loss value associated with the proximal portion of the fiber link. Modified acquisition conditions that are safe for the communication device are determined based on the partial-link loss value and on loss-related maximum rating parameters for the communication device. The process is repeated using the modified OTDR acquisition conditions until the end of the link has been reached.

Abstract translation: 提供了用于表征光纤链路的安全模式OTDR方法，以及在这种安全模式下操作的OTDR装置。 该方法包括使用连接在光纤链路的近端处的OTDR设备沿着光纤链路执行OTDR采集，并且在已经被认为对于在光纤链路的远端处的通信设备是安全的OTDR采集条件下操作。 用于表示光纤链路的近端部分的获得的反射曲线用于确定与光纤链路的近端部分相关联的部分链路损耗值。 基于通信设备的部分链路损耗值和与丢失相关的最大额定值参数来确定对通信设备安全的修改的采集条件。 使用修改的OTDR采集条件重复该过程，直到达到链接结束。

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：US20160041065A1

公开(公告)日：2016-02-11

申请号：US14820864

申请日：2015-08-07

Applicant: EXFO INC.

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

IPC: G01M11/00 ,  H04B10/071

CPC classification number: G01M11/3136 ,  G01M11/3154

Abstract: There is provided a method and a system for identifying or verifying the fiber arrangement and/or the cable type of multi-fiber array cables (such as MPO cables) which employs an OTDR acquisition device at the near end of the MPO cable, a loopback device at the far end and an array of signatures detectable by the OTDR, either at the far or the near end. The loopback device allows performing bidirectional OTDR measurements with a single OTDR acquisition device (without moving it from one end to the other) and the signature array provides fiber arrangement/cable type identification or verification.

Abstract translation: 提供了一种用于识别或验证在MPO电缆的近端使用OTDR采集设备的多纤维阵列电缆（例如MPO电缆）的光纤布置和/或电缆类型的方法和系统，环回 远端或远端的OTDR检测到的签名阵列。 环回设备允许使用单个OTDR采集设备执行双向OTDR测量（不将其从一端移动到另一端），并且签名阵列提供光纤布置/电缆类型识别或验证。

公开(公告)号：US20150110486A1

公开(公告)日：2015-04-23

申请号：US14223165

申请日：2014-03-24

Applicant: EXFO INC.

Inventor： Henrik Sunnerud ,  Mats Skold ,  Mathias Westlund

IPC: H04B10/079 ,  H04J14/06

CPC classification number: H04B10/07953 ,  H04J14/06

Abstract: There is provided a system and a method for determining an in-band noise parameter representative of the optical noise contribution (such as OSNR) on a polarization-multiplexed optical Signal-Under-Test (SUT) comprising two polarized phase-modulated data-carrying contributions and an optical noise contribution. For each of a multiplicity of distinct polarization-analyzer conditions, the SUT is analyzed to provide at least one polarization-analyzed component of the SUT and the polarization-analyzed component is detected with an electronic bandwidth at least ten times smaller than the symbol rate of the SUT to obtain a corresponding acquired electrical signal; for each acquired electrical signal, a value of a statistical parameter is determined from the ac component of the acquired electrical signal, thereby providing a set of statistical-parameter values corresponding to the multiplicity of distinct polarization-analyzer conditions; and, from the set of statistical-parameter values, the in-band noise parameter is mathematically determined.

Abstract translation: 提供了一种系统和方法，用于在偏振复用光信号不足测试（SUT）上确定表示光噪声贡献（例如OSNR）的带内噪声参数的系统和方法，该信号包括两个偏振相位调制数据携带 贡献和光学噪声贡献。 对于多个不同的偏振分析器条件中的每一个，分析SUT以提供至少一个SUT的偏振分析分量，并且以电子带宽检测偏振分析的分量，比电子带宽小至少比符号率 SUT获得相应的获取的电信号; 对于每个获取的电信号，从所获取的电信号的ac分量确定统计参数的值，从而提供与多个不同偏振分析器条件对应的一组统计参数值; 并且从该组统计参数值中，数学地确定带内噪声参数。