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公开(公告)号：US11879802B2
公开(公告)日：2024-01-23
申请号：US17451397
申请日：2021-10-19
Applicant: EXFO Inc.
Inventor： Stephane Perron , Michel Leclerc , Pascal Gosselin-Badaroudine
IPC: G01M11/00 , H04B10/071
CPC classification number: G01M11/3154 , G01M11/3136 , H04B10/071
Abstract: There are provided methods and systems for testing the continuity of optical fiber links under test and/or a fiber arrangement, polarity or mapping of optical fiber connections within optical devices under test using the backscattering pattern as a signature. The device under test may comprises a single fiber, a duplex link, a multifiber cable or another multi-port device such as a backplane device.
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公开(公告)号：US12050150B2
公开(公告)日：2024-07-30
申请号：US17738295
申请日：2022-05-06
Applicant: EXFO Inc.
Inventor： Michel Leclerc
IPC: G01M11/00 , H04B10/071 , H04B10/2513
CPC classification number: G01M11/3127 , G01M11/3145 , H04B10/071 , H04B10/2513
Abstract: There is provided a technique to reduce the Rayleigh coherence noise in OTDR measurements using spectral averaging of OTDR traces while at least partly cancelling chromatic dispersion pulse broadening on the averaged OTDR trace by applying a chromatic dispersion correction prior to averaging the OTDR traces. By correcting for chromatic dispersion pulse broadening, it allows to reduce the Rayleigh coherence noise without impacting the OTDR spatial resolution.
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公开(公告)号：US20150346054A1
公开(公告)日：2015-12-03
申请号：US14820707
申请日：2015-08-07
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 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。
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公开(公告)号：US09134197B2
公开(公告)日：2015-09-15
申请号：US14014606
申请日：2013-08-30
Applicant: EXFO INC.
Inventor： Mario L'Heureux , Michel Leclerc , Eric Thomassin , Stephane Perron
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。
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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
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.
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Patent Agency Ranking
公开(公告)号：US12047117B2
公开(公告)日：2024-07-23
申请号：US17443607
申请日：2021-07-27
Applicant: EXFO Inc.
Inventor： Gang He , Michel Leclerc
IPC: H04B10/079 , G02B6/42
CPC classification number: H04B10/07955 , G02B6/4286
Abstract: There are provided herein test instruments, devices and methods for measuring the optical power loss of optical-fiber devices under test, and particularly those terminated with multifiber connectors, which allows for a one-cord or one-cord equivalent reference method whichever the pinning of the actual optical-fiber device under test. There is proposed to add an optical-fiber expansion device to convert the pinning of the input interface of the power meter instrument from pinned to unpinned or vice-versa, while not adding extra measurement uncertainty. This is accomplished using a patch cord which core diameter is between that of the device under test and that of the input interface of the power meter instrument.
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公开(公告)号：US10371596B2
公开(公告)日：2019-08-06
申请号：US14820864
申请日：2015-08-07
Applicant: EXFO INC.
Inventor： Mario L'Heureux , Stephane Perron , Michel Leclerc
IPC: G01M11/00
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.
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公开(公告)号：US20240385076A1
公开(公告)日：2024-11-21
申请号：US18664669
申请日：2024-05-15
Applicant: EXFO Inc.
Inventor： Mario L’Heureux , Michel Leclerc
IPC: G01M11/00
Abstract: Systems, methods, and devices for testing for faults in a fiber optic cable are provided. A Visual Fault Locator (VFL), according to one implementation, includes an output port configured for connection with an optical fiber to be tested. The VFL also includes a variable light source configured to emit visible light at different power levels from the output port. For example, the different power levels may correspond with different light intensity levels. In some implementations, the VFL may further include a gain control device connected to the variable light source, whereby the gain control device may be configured to control the power of the variable light source to enable the variable light source to emit the visible light at multiple power levels.
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公开(公告)号：US11906389B1
公开(公告)日：2024-02-20
申请号：US17660077
申请日：2022-04-21
Applicant: EXFO Inc.
Inventor： Stephane Perron , Michel Leclerc
IPC: G01M11/00 , H04B10/071 , G02B6/255
CPC classification number: G01M11/3109 , H04B10/071 , G02B6/255
Abstract: There is provided a system and a method for assisting a technician in fiber optic cable splices and comprising a pair of test units including an OTDR, an optical switch, a tone generator and a tone detector to automate the splicing process and testing. The test units may be in communication with a wireless portable device used by the splicing technician and controlled therefrom. In one embodiment, the test units are driven by a test orchestrator application (e.g., server-based) to switch fibers, perform continuity tests and/or splice quality tests, triggered by the technician's portable device.
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公开(公告)号：US11340137B2
公开(公告)日：2022-05-24
申请号：US16722901
申请日：2019-12-20
Applicant: EXFO Inc.
Inventor： Michel Leclerc , Mario L'Heureux , Stephane Perron
Abstract: There are provided techniques for characterizing and testing a cable routing connection configuration connection arrangement comprising a plurality of optical fiber links connected between at least a first connection device at a first end and a second multi-fiber connection device at a second end. Test light is injected into one or more of the optical fiber links via corresponding optical fiber ports of the first connection device. At least one image of the second multi-fiber connection device is captured. Test light exiting the optical fiber link(s) through optical fiber port(s) of the second multi-fiber connection device is imaged as light spot(s) in the captured image. Positions on the second multi-fiber connection device that corresponds to the optical fiber port(s) are determined based on a pattern of the light spot(s) in the captured image. In some implementations, the provided techniques allow detection or verification of cable routing connection configurations at multi-fiber distribution panels.
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