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91. 发明申请

US20140198311A1 BI-DIRECTIONAL MULTI-PULSEWIDTH OPTICAL TIME-DOMAIN REFLECTOMETER 有权
标题翻译：双向多脉冲光学时域反射仪
公开(公告)号：US20140198311A1
公开(公告)日：2014-07-17
申请号：US14014606
申请日：2013-08-30
申请人： EXFO INC.
发明人： Mario L'Heureux , Michel Leclerc , Eric Thomassin , Stephane Perron
IPC分类号： G01M11/00
CPC分类号： G01M11/3145 , G01M11/3109 , G01M11/3118 , G01M11/39
摘要： 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.
摘要翻译：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。

92. 发明申请

US20140037285A1 MULTIPLE-ACQUISITION OTDR METHOD AND DEVICE 有权
标题翻译：多收购OTDR方法和设备
公开(公告)号：US20140037285A1
公开(公告)日：2014-02-06
申请号：US14044768
申请日：2013-10-02
申请人： EXFO INC.
发明人： Stéphane Perron , Michel Leblanc
IPC分类号： H04B10/071
CPC分类号： H04B10/071 , G01M11/3127 , G01M11/3136 , G01M11/3145
摘要： 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.
摘要翻译：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。

93. 发明申请

US20120093501A1 In-Band Optical Noise Measurement Using Differential Polarization Response 审中-公开
标题翻译：使用差分极化响应的带内光噪声测量
公开(公告)号：US20120093501A1
公开(公告)日：2012-04-19
申请号：US13378557
申请日：2010-08-19
申请人： Gang He , Normand Cyr
发明人： Gang He , Normand Cyr
IPC分类号： H04B10/08
CPC分类号： H04B10/07953
摘要： A method comprises: acquiring, for a number nSOP of varied State-Of-Polarization analysis conditions of the input optical signal, nSOP polarization-analyzed optical spectrum traces, the distribution of the input optical signal of said SOP analysis conditions being approximately known; mathematically discriminating said signal contribution from said noise contribution within said optical signal bandwidth using said polarization-analyzed optical spectrum traces, said mathematically discriminating comprising: obtaining a differential polarization response that is related to the optical spectrum of said signal contribution by a constant of proportionality; estimating the constant of proportionality of a differential polarization response to the optical spectrum of said signal contribution as a function of said number nSOP; estimating the optical spectrum of said noise contribution from said input optical signal, within said optical signal bandwidth using said constant of proportionality and said differential polarization response; and determining said in-band noise parameter on said input optical signal from the mathematically discriminated noise contribution.
摘要翻译：一种方法包括：对于输入光信号，nSOP偏振分析的光谱轨迹的不同状态的极化分析条件的数量nSOP，获取所述SOP分析条件的输入光信号的分布近似已知; 使用所述经偏振分析的光谱轨迹，在所述光信号带宽内从所述噪声贡献中数学地识别所述信号贡献，所述数学鉴别包括：获得与所述信号贡献的光谱相关比例常数的差分偏振响应; 估计作为所述数量nSOP的函数的所述信号贡献的光谱的差分偏振响应的比例常数; 使用所述比例常数和所述微分极化响应在所述光信号带宽内估计来自所述输入光信号的所述噪声贡献的光谱; 以及从所述数学鉴别的噪声贡献中确定所述输入光信号上的所述带内噪声参数。

94. 发明公开

US20240255713A1 ADAPTER TIP AND MICROSCOPE SYSTEM FOR INSPECTING APC TRANS-DUPLEX FIBER-OPTIC CONNECTORS 审中-公开
公开(公告)号：US20240255713A1
公开(公告)日：2024-08-01
申请号：US18420965
申请日：2024-01-24
申请人： EXFO Inc.
发明人： Olivier COTE , Jean Filion , Raphael LABERGE
IPC分类号： G02B6/38
CPC分类号： G02B6/3898 , G02B6/3825 , G02B6/385
摘要： There is provided an adapter tip to be employed with an optical-fiber connector-endface inspection microscope device and an optical-fiber connector endface inspection microscope system suitable for imaging two non-parallel APC optical-fiber endfaces of a duplex (i.e., APC trans-duplex) optical-fiber connector. Because the two optical-fiber endfaces of an APC trans-duplex connector are angled-polished (APC) in different directions (non-parallel), inspection light reflected on the two endfaces take diverging pathways. A single-fiber or multi-fiber inspection microscope therefore cannot allow inspection of both optical-fiber endfaces at once. The proposed adapter tip or microscope system comprises relay optics defining two imaging paths (one for each optical-fiber endface), wherein each imaging path comprises at least one optical component (e.g., an optical prism) used to deviate inspection light from each endface towards the optical axis of the objective lens, such that both endfaces may be imaged within the field of view of the inspection microscope.

95. 发明授权

US12052134B2 Identification of clusters of elements causing network performance degradation or outage 有权
公开(公告)号：US12052134B2
公开(公告)日：2024-07-30
申请号：US17649219
申请日：2022-01-28
申请人： EXFO Inc.
发明人： Hai Hong Phan Vu , Justin Whatley , Brigitte Jaumard , Tristan Glatard , Sylvain Nadeau
IPC分类号： H04L41/08 , G06N5/025 , H04L41/0631
CPC分类号： H04L41/08 , G06N5/025 , H04L41/0631
摘要： An embodiment involves obtaining a tabular data set with columns that characterize items relating to behavior of components of a communication network; constructing a frequent-pattern tree, each node being associated with: (i) an item-name for representing an item, (ii) a count of transactions from a root node of the tree to the respective node, and (iii) node-links that refer to other nodes in the tree that represent items having the same item-name; traversing the tree to identify a set of nodes with counts greater than a predefined support threshold; generating, from the nodes, association-rules that are based on antecedent items associated with a target item; reducing the association-rules by (i) removing the association-rules in which the antecedent items thereof are a superset or subset of the antecedent items of a further association-rule, or (ii) combining the association-rules that have antecedent items that are at least partially disjoint and conditionally dependent.

96. 发明授权

US12050150B2 Spectral averaging of OTDR traces 有权
公开(公告)号：US12050150B2
公开(公告)日：2024-07-30
申请号：US17738295
申请日：2022-05-06
申请人： EXFO Inc.
发明人： Michel Leclerc
IPC分类号： G01M11/00 , H04B10/071 , H04B10/2513
CPC分类号： G01M11/3127 , G01M11/3145 , H04B10/071 , H04B10/2513
摘要： 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.

97. 发明公开

US20240134076A1 METHOD AND APPARATUS OF DISTRIBUTED ACOUSTIC SENSING 审中-公开
公开(公告)号：US20240134076A1
公开(公告)日：2024-04-25
申请号：US18390981
申请日：2023-12-20
申请人： EXFO Inc.
发明人： Hongxin CHEN , Normand CYR
IPC分类号： G01V1/22 , G01V1/00
CPC分类号： G01V1/226 , G01V1/001
摘要： There is provided a method and an apparatus of fiber optic distributed acoustic sensing (DAS) which use a simple, reliable and robust signal processing for amplitude-based DAS measurements. 1) The lack of linearity of the amplitude-based DAS measurements (due to its unpredictable variation of the transfer function along the fiber) can be improved by normalizing the amplitude vs distance using an amplitude-normalization trace obtained from either a) coherent laser OTDR measurements with laser frequency dithering or b) computing a normalization trace from the coherent OTDR/DAS traces and the un-coherent OTDR/DAS traces. 2) Instrument offset (e.g., due to low vertical sampling resolution) may further be corrected using un-coherent OTDR/DAS traces to extract an instrument system offset.

98. 发明公开

US20240012167A1 METHOD AND APPARATUS OF DISTRIBUTED ACOUSTIC SENSING 审中-公开
公开(公告)号：US20240012167A1
公开(公告)日：2024-01-11
申请号：US18329133
申请日：2023-06-05
申请人： EXFO Inc.
发明人： Hongxin CHEN , Michel LEBLANC , Michel LECLERC
IPC分类号： G01V1/22 , G01V1/00
CPC分类号： G01V1/226 , G01V1/001
摘要： There is provided a method and an apparatus of fiber optic distributed acoustic sensing (DAS) which can use low-cost coherent laser as well as low-cost acquisition and processing electronics and which can still provide reliable monitoring results for optical fiber monitoring and troubleshooting applications in optical fiber telecommunication networks. Such low-cost solution is made possible by employing grouped data signal processing. Data is processed over independent groups of data to provide an independent DAS signal for each group. This allows measurements to be less sensitive to laser fluctuations and thereby reduces coherent laser technical specification requirements and allows the use of a low-cost coherent laser (thereby reducing the cost of the laser) as well as low-cost acquisition and processing electronics.

99. 发明授权

US11624680B2 Optical fiber endface inspection microscope having adapter tip detection and autoconfiguration 有权
公开(公告)号：US11624680B2
公开(公告)日：2023-04-11
申请号：US17446368
申请日：2021-08-30
申请人： EXFO Inc.
发明人： Mario L'Heureux , Guillaume Lavallee , Robert Baribault
IPC分类号： G01M11/00 , G01M11/02 , G02B6/38 , G06T7/00 , G01N21/88 , G01N21/95
摘要： There are provided an optical-fiber connector endface inspection microscope system and a method for inspecting an endface of an optical-fiber connector. The inspection microscope device is releasably connectable to an adapter tip configured to interface with the optical-fiber connector to inspect the endface thereof. The adapter tip is one among a plurality of adapter tip types adapted to inspect respective types of optical-fiber connectors. The optical-fiber connector endface inspection microscope system comprises a tip detection system adapted to recognize the type of the adapter tip among the plurality of adapter tip types; and is configured to analyze inspection images to produce an inspection result for the endface, at least partly based on a fiber type corresponding to the recognized adapter tip and/or other information read by the tip detection system.

100. 发明授权

US11595125B2 Transceiver agnostic GOSNR measurement 有权
公开(公告)号：US11595125B2
公开(公告)日：2023-02-28
申请号：US17183415
申请日：2021-02-24
申请人： EXFO Inc.
发明人： Gang He , Daniel Gariepy
IPC分类号： H04B17/00 , H04B10/079 , H04B10/073
摘要： There is herein provided a method for measuring the GOSNR that can be implemented using commercial-grade transceivers and which accounts for linear optical impairments (e.g. PMD, PDL and CD) and transceiver intrinsic impairments. The method may be implemented using an Optical Spectrum Analyzer (OSA) and either the system transceivers or other commercial-grade transceivers. The proposed measurement method is based on mixed optical and electronic technologies, using an OSA and a transceiver pair. By measuring a signal quality metric Qm and the OSNR under varied power and ASE noise conditions, a constant value RBW that relates the GOSNR to the signal quality metric Qm is derived. The GOSNR is then obtained from these results.

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