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    METHOD AND APPARATUS FOR PROVIDING A PILOT TONE
    1.
    发明申请
    METHOD AND APPARATUS FOR PROVIDING A PILOT TONE 审中-公开

    公开(公告)号：US20170373748A1

    公开(公告)日：2017-12-28

    申请号：US15200325

    申请日：2016-07-01

    Applicant: Huawei Technologies Co., Ltd.

    Inventor： Zhiping Jiang ,  Tejia Liu ,  Hong Yang ,  Dajiang Jin ,  Minggang Si

    IPC: H04B10/077

    Abstract: The disclosure is directed at a method and system for optical telecommunications performance monitoring via a dual frequency pilot tone. By applying a dual frequency pilot tone, with a first pilot tone frequency selected from a low frequency band and a second pilot tone frequency selected from a high frequency band, either simultaneously or alternatively, to a wavelength channel, one of the pilot tone frequencies may be adaptively selected to improve wavelength channel monitoring. More specifically, stimulated Raman scattering (SRS) caused crosstalk and chromatic dispersion (CD) caused pilot fading which adversely affect performance monitoring of the wavelength channel may be reduced.

    Method and apparatus for providing a pilot tone
    2.
    发明授权
    Method and apparatus for providing a pilot tone 有权

    公开(公告)号：US10432303B2

    公开(公告)日：2019-10-01

    申请号：US15200325

    申请日：2016-07-01

    Applicant: Huawei Technologies Co., Ltd.

    Inventor： Zhiping Jiang ,  Tejia Liu ,  Hong Yang ,  Dajiang Jin ,  Minggang Si

    IPC: H04B10/08 ,  H04B10/077 ,  H04J14/02

    Abstract: The disclosure is directed at a method and system for optical telecommunications performance monitoring via a dual frequency pilot tone. By applying a dual frequency pilot tone, with a first pilot tone frequency selected from a low frequency band and a second pilot tone frequency selected from a high frequency band, either simultaneously or alternatively, to a wavelength channel, one of the pilot tone frequencies may be adaptively selected to improve wavelength channel monitoring. More specifically, stimulated Raman scattering (SRS) caused crosstalk and chromatic dispersion (CD) caused pilot fading which adversely affect performance monitoring of the wavelength channel may be reduced.

    SPUR REMOVAL IN PILOT-TONE OPM
    4.
    发明申请
    SPUR REMOVAL IN PILOT-TONE OPM 审中-公开

    公开(公告)号：US20190074923A1

    公开(公告)日：2019-03-07

    申请号：US15694983

    申请日：2017-09-04

    Applicant: HUAWEI TECHNOLOGIES CO., LTD.

    Inventor： Minggang Si ,  Zhiping Jiang ,  Jianhong Ke ,  Dajiang Jin

    IPC: H04J14/02 ,  H04B10/69

    CPC classification number: H04J14/021 ,  H04B10/69 ,  H04J14/0221 ,  H04J14/0276

    Abstract: Embodiments can provide spurs removal in a pilot-tone spread signal. For achieving this, at least one peak in the pilot-tone spread signal may be found. A predetermined small range of the spectra power around the at least one peak may be removed. In some situations, the removal of the spurs in the pilot-tone spread signal may result in inadvertent removal of a normal part of the pilot-tone spread signal. For addressing this, a power ratio between the spectrum of the pilot-tone spread signal before the removal and after the removal can be calculated. For accounting for the power loss due to the spurs removal, this power ratio can be applied to the pilot-tone spread signal after the removal to obtain a corrected pilot-tone spread signal.

    System and method for pilot data detection using correlation peak tracking
    5.
    发明授权
    System and method for pilot data detection using correlation peak tracking 有权

    公开(公告)号：US10116385B2

    公开(公告)日：2018-10-30

    申请号：US15336130

    申请日：2016-10-27

    Applicant: Huawei Technologies Co., Ltd.

    Inventor： Zhiping Jiang ,  Jianhong Ke ,  Dajiang Jin

    IPC: H04B10/077 ,  H04B10/079 ,  H04L5/00 ,  H04J14/02

    Abstract: During optical performance monitoring in low SNR conditions, the detection of pilot data may be more difficult because the detector may mistake noise for the pilot data signal. Systems and methods are disclosed herein that try to address this problem. In one embodiment, a pilot tone detector processes the received signal to determine a maximum correlation peak, and then performs tracking of the correlation peak over time. Unlike the pilot data signal, noise is typically more transient in nature. Therefore, if a correlation peak does not actually correspond to the pilot data signal, but instead corresponds to noise, then the correlation peak typically disappears over time when tracked. A search for a new correlation peak may then be performed. When a correlation peak is determined that actually corresponds to the pilot data signal, then the correlation peak typically remains when tracked.

    SYSTEM AND METHOD FOR PILOT DATA DETECTION USING CORRELATION PEAK TRACKING
    6.
    发明申请
    SYSTEM AND METHOD FOR PILOT DATA DETECTION USING CORRELATION PEAK TRACKING 审中-公开

    公开(公告)号：US20180102840A1

    公开(公告)日：2018-04-12

    申请号：US15336130

    申请日：2016-10-27

    Applicant: Huawei Technologies Co., Ltd.

    Inventor： Zhiping Jiang ,  Jianhong Ke ,  Dajiang Jin

    IPC: H04B10/079 ,  H04L5/00 ,  H04J14/02

    CPC classification number: H04B10/07953 ,  H04B10/0775 ,  H04J14/02 ,  H04L5/0048

    Abstract: During optical performance monitoring in low SNR conditions, the detection of pilot data may be more difficult because the detector may mistake noise for the pilot data signal. Systems and methods are disclosed herein that try to address this problem. In one embodiment, a pilot tone detector processes the received signal to determine a maximum correlation peak, and then performs tracking of the correlation peak over time. Unlike the pilot data signal, noise is typically more transient in nature. Therefore, if a correlation peak does not actually correspond to the pilot data signal, but instead corresponds to noise, then the correlation peak typically disappears over time when tracked. A search for a new correlation peak may then be performed. When a correlation peak is determined that actually corresponds to the pilot data signal, then the correlation peak typically remains when tracked.

    Spur removal in pilot-tone OPM
    9.
    发明授权
    Spur removal in pilot-tone OPM 有权

    公开(公告)号：US10348438B2

    公开(公告)日：2019-07-09

    申请号：US15694983

    申请日：2017-09-04

    Applicant: HUAWEI TECHNOLOGIES CO., LTD.

    Inventor： Minggang Si ,  Zhiping Jiang ,  Jianhong Ke ,  Dajiang Jin

    IPC: H04B10/00 ,  H04J14/02 ,  H04B10/69

    Abstract: Embodiments can provide spurs removal in a pilot-tone spread signal. For achieving this, at least one peak in the pilot-tone spread signal may be found. A predetermined small range of the spectra power around the at least one peak may be removed. In some situations, the removal of the spurs in the pilot-tone spread signal may result in inadvertent removal of a normal part of the pilot-tone spread signal. For addressing this, a power ratio between the spectrum of the pilot-tone spread signal before the removal and after the removal can be calculated. For accounting for the power loss due to the spurs removal, this power ratio can be applied to the pilot-tone spread signal after the removal to obtain a corrected pilot-tone spread signal.

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