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21. 发明授权

US09112604B2 Reference-based in-band OSNR measurement on polarization-multiplexed signals 有权
标题翻译：偏振复用信号的基于参考的带内OSNR测量
公开(公告)号：US09112604B2
公开(公告)日：2015-08-18
申请号：US13501708
申请日：2011-02-14
申请人： Daniel Gariepy , Gang He
发明人： Daniel Gariepy , Gang He
IPC分类号： H04B17/00 , H04B10/079
CPC分类号： H04B10/07953
摘要： There is provided a method for determining an in-band noise parameter, such as the Optical Signal-to-Noise Ratio (OSNR), on an optical signal-under-test (SUT) propagating along an optical communication link and comprising a data-carrying signal contribution of any arbitrary degree of polarization and a noise contribution. A spectral shape trace of data-carrying signal contribution in the SUT is estimated using a reference optical spectrum trace of a reference signal which comprises a data-carrying signal contribution that is spectrally representative of the data-carrying signal contribution of the SUT and a noise contribution which is at least approximately known. The data-carrying signal contribution is mathematically discriminated from said noise contribution in the SUT using the spectral shape trace and the test optical spectrum trace. The in-band noise parameter is then determined at least from the mathematically discriminated noise contribution.
摘要翻译：提供了一种用于在沿着光通信链路传播的光信号在测试（SUT）上确定带内噪声参数（诸如光信噪比（OSNR））的方法，并且包括数据 - 携带任何任意极化度和噪声贡献的信号贡献。使用参考信号的参考光谱轨迹来估计SUT中的数据携带信号贡献的谱形轨迹，该参考信号包括频谱上表示SUT的数据携带信号贡献的数据携带信号贡献，以及噪声贡献至少大致已知。使用光谱形状轨迹和测试光谱轨迹，数据载入信号贡献在数学上与SUT中的噪声贡献区分开。至少从数学识别的噪声贡献中确定带内噪声参数。

22. 发明授权

US09106334B2 Method and system for common-mode-rejection-ratio (CMRR) characterization of an integrated coherent receiver 有权
标题翻译：用于集成相干接收机的共模抑制比（CMRR）表征的方法和系统
公开(公告)号：US09106334B2
公开(公告)日：2015-08-11
申请号：US14273652
申请日：2014-05-09
申请人： EXFO Inc.
发明人： Mathias Westlund , Henrik Sunnerud
IPC分类号： H04B10/073 , H04B10/61
CPC分类号： H04B10/0731 , H04B10/614
摘要： 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.
摘要翻译：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。

23. 发明申请

US20140341564A1 METHOD AND SYSTEM FOR COMMON-MODE-REJECTION-RATIO (CMRR) CHARACTERIZATION OF AN INTEGRATED COHERENT RECEIVER 有权
标题翻译：集成相干接收机的共模抑制比（CMRR）特征的方法和系统
公开(公告)号：US20140341564A1
公开(公告)日：2014-11-20
申请号：US14273652
申请日：2014-05-09
申请人： EXFO Inc.
发明人： Mathias WESTLUND , Henrik SUNNERUD
IPC分类号： H04B10/073 , H04B10/64 , H04B10/61
CPC分类号： H04B10/0731 , H04B10/614
摘要： 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.
摘要翻译：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。

24. 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。

25. 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。

26. 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。

27. 发明授权

US11540234B2 Automated narrow peak interference severity estimation 有权
公开(公告)号：US11540234B2
公开(公告)日：2022-12-27
申请号：US17108716
申请日：2020-12-01
申请人： EXFO Inc.
发明人： Marco Di Pietro , Martin Levesque
IPC分类号： H04W52/34 , H04W24/10 , H04W52/36
摘要： A method comprising obtaining, via a test system, data from one or more tests of a mobile network having at least one antenna, wherein the data includes a stream of RF samples captured over-the-air or from a Common Public Radio Interface (CPRI) or enhanced CPRI (eCPRI) link; processing the data to detect peaks; performing an analysis of any detected peaks to identify any issues on the mobile network, the analysis including determining a relative power of the detected peaks; and causing display of a user interface that includes a reporting of any the relative power. Determining a relative power includes obtaining a baseline of a subset of the data and comparing an absolute power of the peak to the baseline.

28. 发明授权

US11522939B2 Over-the-top media service testing and QoE issues isolation 有权
公开(公告)号：US11522939B2
公开(公告)日：2022-12-06
申请号：US17351368
申请日：2021-06-18
申请人： EXFO Inc.
发明人： Sylvain Nadeau , Kevin Corre
IPC分类号： H04L65/80 , H04L67/02 , H04L65/61
摘要： A method for Over-The-Top (OTT) media service monitoring and testing including deploying multiple test agents throughout the network and orchestrating them together to create a single OTT media service delivery path with coherent measurement points. The method includes selecting and configuring all test agents forming an OTT media service delivery path in a network, wherein the test agents are deployed on devices in the network with pairs of agents in a client-server relationship; for each selected test agent, simulating a Hyper Text Transport Protocol (HTTP) Adaptive Streaming (HAS) media playback using a pair test agent as a HAS server; for each selected test agent, monitoring the HAS media playback via a Quality of Experience (QoE) model to collect metrics, influence factors, and QoE scores; and reporting collected metrics, influence factors and QoE scores, wherein the QoE scores are compared to isolate any performance degradation.

29. 发明授权

US11519782B2 Offset nulling for optical power meters 有权
公开(公告)号：US11519782B2
公开(公告)日：2022-12-06
申请号：US17002970
申请日：2020-08-26
申请人： EXFO Inc.
发明人： Nelu Radu
IPC分类号： G01J1/44
摘要： There is provided an optical power measurement method, an offset calibration method and an optical power meter that is adapted to apply the offset calibration method. The optical power measurement method, the offset calibration method and the optical power meter are characterized in that two temperature sensors are used for more accurate predictions of the optical power offset. A first temperature sensor is positioned to read a temperature of the photodiode and a second temperature sensor is positioned to read a temperature of the PCB ground plane.

30. 发明申请

US20220191597A1 AUTOMATED CALIBRATION OF QOE ASSESSMENT BETWEEN CONTENT DELIVERY NETWORK (CDN) ENTITIES 有权
公开(公告)号：US20220191597A1
公开(公告)日：2022-06-16
申请号：US17549271
申请日：2021-12-13
申请人： EXFO Inc.
发明人： Sylvain NADEAU
IPC分类号： H04N21/647 , H04N21/25
摘要： A method includes obtaining a first Quality of Experience, QoE, measurement from a first content source; determining a QoE adjustment factor based on a predictive model; and adjusting the first QoE measurement using the QoE adjustment factor to obtain a second QoE measurement, the second QoE measurement reflects a QoE estimate from a second content source. The first content source can be a Content Delivery Network, CDN, entity, and the second content source is an Over-the-Top, OTT, content provider.

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