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    Transceiver agnostic GOSNR measurement
    1.
    发明授权
    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

    Applicant: EXFO Inc.

    Inventor： Gang He ,  Daniel Gariepy

    IPC: H04B17/00 ,  H04B10/079 ,  H04B10/073

    Abstract: 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.

    METHOD AND SYSTEM FOR MEASURING AN OPTICAL POWER ATTENUATION VALUE OF A MULTIMODE DEVICE UNDER TEST, RECEIVE DEVICE AND COMPUTER-READABLE MEMORY
    3.
    发明申请
    METHOD AND SYSTEM FOR MEASURING AN OPTICAL POWER ATTENUATION VALUE OF A MULTIMODE DEVICE UNDER TEST, RECEIVE DEVICE AND COMPUTER-READABLE MEMORY 审中-公开
    用于测试测试，接收设备和计算机可读存储器的多模设备的光功率衰减值的方法和系统

    公开(公告)号：US20160218802A1

    公开(公告)日：2016-07-28

    申请号：US14966628

    申请日：2015-12-11

    Applicant: EXFO INC.

    Inventor： Bernard Ruchet ,  Gang He

    IPC: H04B10/079

    CPC classification number: H04B10/07955 ,  G01M11/33

    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.

    Abstract translation: 提供了一种用于测量多模DUT的光功率衰减值的方法。 该方法通常使用光源，沿着具有第一多模器件的多模器件链路传播测试光，多模DUT和彼此串联连接的第二多模器件; 所述传播包括沿第一多模设备和沿第二多模设备诱导测试光的高阶光纤模式的优先衰减; 使用光功率检测器，检测由沿着多模设备链路的测试光的传播而产生的光信号，并且基于检测到的光信号发送输出信号; 以及使用处理器，基于所述输出信号确定所述多模DUT的光功率衰减值。

    CHARACTERIZATION OF NON-ASE NOISE ON OPTICAL SIGNALS
    4.
    发明申请
    CHARACTERIZATION OF NON-ASE NOISE ON OPTICAL SIGNALS 有权
    光学信号上非ASE噪声的表征

    公开(公告)号：US20130330071A1

    公开(公告)日：2013-12-12

    申请号：US13965823

    申请日：2013-08-13

    Applicant: EXFO INC.

    Inventor： Gang He ,  Daniel Gariepy ,  Hongxin Chen ,  Bernard Ruchet

    IPC: H04B10/073

    CPC classification number: H04B10/073 ,  H04B10/0775 ,  H04B10/07953 ,  H04J14/02 ,  H04J14/06

    Abstract: There is provided a method for determining a noise parameter characterizing an optical Signal-Under-Test (SUT) having a signal contribution, an Amplified Spontaneous Emission (ASE) noise contribution and a non-ASE optical noise contribution, such as a carrier-leakage contribution or a depolarized-signal contribution, within an optical-signal bandwidth. The method comprises acquiring optical spectrum trace(s) of the SUT, discriminating at least the non-ASE optical noise contribution from the ASE-noise contribution using the optical spectrum trace(s) and/or a trace obtained from the optical spectrum trace(s); and determining the noise parameter using discriminated non-ASE optical noise contribution and/or the discriminated ASE-noise contribution.

    Abstract translation: 提供了一种用于确定表征具有信号贡献，放大自发发射（ASE）噪声贡献和非ASE光学噪声贡献的光信号不足（SUT）的噪声参数的方法，例如载波泄漏 贡献或去极化信号贡献，在光信号带宽内。 该方法包括获取SUT的光谱轨迹，使用光谱轨迹和/或从光谱轨迹获得的轨迹来区分来自ASE-噪声贡献的至少非ASE光学噪声贡献（和 s）; 以及使用鉴别的非ASE光学噪声贡献和/或所识别的ASE-噪声贡献来确定噪声参数。

    Optical loss testing of multi-fiber array cables
    6.
    发明授权
    Optical loss testing of multi-fiber array cables 有权

    公开(公告)号：US11067478B2

    公开(公告)日：2021-07-20

    申请号：US16776692

    申请日：2020-01-30

    Applicant: EXFO Inc.

    Inventor： Gang He

    IPC: G01M11/00

    Abstract: There is provided an optical loss testing system for multi-fiber array cables an optical loss test method and a reference method therefor which overcomes at least part of the multi-powermeter uncertainty. A prior calibration step serves to characterize the relative difference in optical power response of the multiple power meters. This relative difference can then be used to correct the optical loss measurement so as to eliminate its effect.

    Noise-free measurement of the spectral shape of a modulated signal using spectral correlation
    7.
    发明授权
    Noise-free measurement of the spectral shape of a modulated signal using spectral correlation 有权

    公开(公告)号：US10727940B2

    公开(公告)日：2020-07-28

    申请号：US16445992

    申请日：2019-06-19

    Applicant: EXFO Inc.

    Inventor： Normand Cyr ,  Gang He ,  Bernard Ruchet

    IPC: H04B10/00 ,  H04B10/079

    Abstract: Method and systems for characterizing an optical signal propagating along a communication link are disclosed. The signal includes a data-carrying signal contribution, modulated at a symbol frequency, and a noise contribution. The method includes measuring an optical power spectrum of the signal, which includes a data-carrying signal spectrum component and a noise spectrum component. The method also includes determining a measured spectral correlation function within pairs of spectral components of the signal as a function of center frequency of the pairs, the spectral components in each pair being spectrally separated from each other by the symbol frequency. The method further includes obtaining a solution for the data-carrying signal spectrum component based on the measured optical power spectrum, such that a calculated spectral correlation function based on the solution matches the measured spectral correlation function. In some embodiments, the spectral correlation function is measured as a low-frequency beatnote amplitude function.

    Signal deformation measurement on polarization-multiplexed signals
    8.
    发明授权
    Signal deformation measurement on polarization-multiplexed signals 有权
    偏振复用信号的信号变形测量

    公开(公告)号：US09596027B2

    公开(公告)日：2017-03-14

    申请号：US14268144

    申请日：2014-05-02

    Applicant: EXFO Inc.

    Inventor： Gang He ,  Daniel Gariepy ,  Mats Skold

    IPC: H04B10/079 ,  H04J14/06

    CPC classification number: H04B10/07953 ,  H04J14/06

    Abstract: There is provided a method and an apparatus for determining quality parameters on a polarization-multiplexed optical signal based on an analysis of the power spectral density of the Signal-Under-Test (SUT). The method is predicated upon knowledge of the spectral shape of the signal in the absence of significant noise or spectral deformation. This knowledge is provided by a reference optical spectrum trace. Based on this knowledge and under the assumption that ASE noise level is approximately constant in wavelength over a given spectral range, the spectral deformation of the signal contribution of the SUT may be estimated using a comparison of the spectral variations of the optical spectrum trace of the SUT with that of the reference optical spectrum trace.

    Abstract translation: 提供了一种基于对测试信号（SUT）的功率谱密度的分析来确定偏振复用光信号质量参数的方法和装置。 该方法基于在没有显着噪声或光谱变形的情况下对信号的光谱形状的了解。 该知识由参考光谱轨迹提供。 基于这一知识，并假设ASE噪声水平在给定光谱范围内的波长近似恒定，则SUT的信号贡献的光谱变形可以使用光谱轨迹的光谱变化的比较来估计 SUT与参考光谱图谱相同。

    Optical-fiber device for one-cord reference optical power loss measurement
    9.
    发明授权
    Optical-fiber device for one-cord reference optical power loss measurement 有权

    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.

    In-band noise and/or spectral deformation measurement on polarization-multiplexed signals
    10.
    发明授权
    In-band noise and/or spectral deformation measurement on polarization-multiplexed signals 有权

    公开(公告)号：US10128975B2

    公开(公告)日：2018-11-13

    申请号：US14931983

    申请日：2015-11-04

    Applicant: EXFO INC.

    Inventor： Gang He ,  Daniel Gariepy

    IPC: H04J14/06 ,  H04B10/079 ,  H04B10/077

    Abstract: There is provided a method to discriminate NLE-induced signal deformation from ASE-noise on polarization multiplexed signals, in order to measure the OSNR under NLE conditions and/or characterize the NLE-induced signal deformation. In accordance with one aspect, the method is based on the acquisition of optical spectrum traces when the (data-carrying) optical communication signal is partially or completely extinguished (ASE-noise only), as well as with a live optical communication signal. Comparing traces acquired with different conditions and/or at different dates allows discrimination of the signal contribution, the ASE-noise contribution and the NLE-induced deformations on the SUT.

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