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：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.

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：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：US10659178B2

公开(公告)日：2020-05-19

申请号：US16159013

申请日：2018-10-12

Applicant: EXFO Inc.

Inventor： Jean-Sébastien Martel ,  Stéphane Perron

IPC: H04B17/15 ,  H04B10/2575 ,  H04B10/071 ,  H04B17/29 ,  G01M11/00 ,  G02B6/35 ,  G02B6/122

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：US09709460B2

公开(公告)日：2017-07-18

申请号：US14575409

申请日：2014-12-18

Applicant: EXFO INC.

Inventor： Michel Leblanc ,  Stéphane Perron

IPC: G01M11/00

CPC classification number: G01M11/31 ,  G01M11/3145 ,  G01M11/3172

Abstract: The reflectometric method for measuring an optical loss value of an optical fiber link generally comprises: obtaining at least one bias value being indicative of a bias induced by differing backscattering characteristics of a first optical fiber length and a second optical fiber length; propagating at least one test signal serially into the first optical fiber length, the optical fiber link and the second optical fiber length; monitoring at least one return signal resulting respectively from the propagation of the at least one test signal; and determining the optical loss value based on the at least one return signal and the at least one bias value.

公开(公告)号：US20150198503A1

公开(公告)日：2015-07-16

申请号：US14575409

申请日：2014-12-18

Applicant: EXFO INC.

Inventor： Michel Leblanc ,  Stéphane Perron

IPC: G01M11/00

CPC classification number: G01M11/31 ,  G01M11/3145 ,  G01M11/3172

Abstract: The reflectometric method for measuring an optical loss value of an optical fiber link generally comprises: obtaining at least one bias value being indicative of a bias induced by differing backscattering characteristics of a first optical fiber length and a second optical fiber length; propagating at least one test signal serially into the first optical fiber length, the optical fiber link and the second optical fiber length; monitoring at least one return signal resulting respectively from the propagation of the at least one test signal; and determining the optical loss value based on the at least one return signal and the at least one bias value.

Abstract translation: 用于测量光纤链路的光损耗值的反射测量方法通常包括：获得指示由第一光纤长度和第二光纤长度的不同后向散射特性引起的偏置的至少一个偏置值; 将至少一个测试信号串行地传播到第一光纤长度，光纤链路和第二光纤长度; 监测分别由所述至少一个测试信号的传播产生的至少一个返回信号; 以及基于所述至少一个返回信号和所述至少一个偏置值来确定所述光学损耗值。

公开(公告)号：US20200252125A1

公开(公告)日：2020-08-06

申请号：US16852600

申请日：2020-04-20

Applicant: EXFO Inc.

Inventor： Jean-Sébastien Martel ,  Stéphane Perron

IPC: H04B10/071 ,  H04B10/079 ,  H04Q11/00 ,  H04B10/27 ,  H04B10/25

Abstract: Fronthaul monitoring systems and methods include a performing protocol testing, via a protocol layer acquisition module, of a protocol layer signal for analysis thereof to identify issues; performing optical physical layer monitoring via an optical physical layer acquisition module to identify optical physical layer issues; and configuring an optical switch to switch an input port connected to the protocol layer acquisition module and the optical physical layer acquisition module over different links of the plurality of links wherein a test coordinator software module is configured to manage the optical switch to coordinate the optical protocol layer analysis of a link and the optical physical layer testing of the link.

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：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。