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    System and method for pilot tone modulation by data bias
    12.
    发明授权
    System and method for pilot tone modulation by data bias 有权
    通过数据偏差进行导频调制的系统和方法

    公开(公告)号：US09270370B2

    公开(公告)日：2016-02-23

    申请号：US14167359

    申请日：2014-01-29

    Applicant: Huawei Technologies Co., Ltd.

    Inventor： Zhiping Jiang ,  Jian Zhong

    IPC: H04B10/079 ,  H04B10/54 ,  H04B10/60 ,  H04J14/02 ,  H04Q11/00

    CPC classification number: H04B10/07955 ,  H04B10/0775 ,  H04B10/541 ,  H04B10/60 ,  H04B2210/075 ,  H04J14/0227 ,  H04Q11/0066 ,  H04Q2011/0083

    Abstract: Embodiments are provided for applying pilot tone modulations to optical signals by introducing bias bits to data frames carried on the optical signals. Since the modulation is done by modifying data, the modulation depth is accurate, and there is no need for calibration or feedback control, which can improve power monitoring accuracy and simplify implementation. In an embodiment, a transmitter determines a period of a pilot tone modulation for tracking or identifying an optical channel. The transmitter inserts a sequence of bias bits, periodically according to the determined period, in a plurality of frames comprising original data bits. The amplitudes of the optical signals carrying the frames are modulated at a higher frequency than the pilot tone modulation. The optical signals are then transmitted including the bias bits within the frames.

    Abstract translation: 提供了通过将偏移位引入到光学信号上承载的数据帧来将导频音调制应用于光信号的实施例。 由于调制是通过修改数据完成的，所以调制深度是准确的，不需要校准或反馈控制，这可以提高功率监控精度并简化实现。 在实施例中，发射机确定用于跟踪或识别光信道的导频音调制的周期。 发射机在包括原始数据比特的多个帧中根据所确定的周期周期性地插入一系列偏置比特。 承载帧的光信号的幅度以比导频音调制更高的频率进行调制。 然后发送光信号，包括帧内的偏置位。

    METHOD AND DEVICE FOR MONITORING IMPAIRMENT, COHERENT RECEIVER AND NETWORK APPARATUS
    13.
    发明申请
    METHOD AND DEVICE FOR MONITORING IMPAIRMENT, COHERENT RECEIVER AND NETWORK APPARATUS 有权

    公开(公告)号：US20250132828A1

    公开(公告)日：2025-04-24

    申请号：US18492905

    申请日：2023-10-24

    Applicant: Huawei Technologies Co., Ltd.

    Inventor： Zhiping Jiang ,  Choloong Hahn ,  Junho Chang

    IPC: H04B10/079

    Abstract: A method for monitoring impairment includes: receiving a first received waveform sent by the coherent receiver; obtaining a second received waveform including a first sub-waveform and a second sub-waveform with a relative first delay therebetween according to the first received waveform; obtaining a template at a predetermined location on the fiber link according to the second received waveform, wherein the template is used for representing a nonlinear noise by a first sub-signal waveform and a second sub-signal waveform at the predetermined location that are respectively obtained from the first sub-waveform and the second sub-waveform and have the first delay therebetween; obtaining a correlation between the second received waveform and the template; changing a value of the first delay to obtain values of the correlation corresponding to different values of the first delay; and outputting a value of the first delay corresponding to a maximum value of the correlation as impairment estimation.

    METHOD AND DEVICE FOR MONITORING GENERALIZED OPTICAL SIGNAL-TO-NOISE RATIO, COHERENT RECEIVER AND NETWORK APPARATUS
    14.
    发明申请
    METHOD AND DEVICE FOR MONITORING GENERALIZED OPTICAL SIGNAL-TO-NOISE RATIO, COHERENT RECEIVER AND NETWORK APPARATUS 有权

    公开(公告)号：US20250088283A1

    公开(公告)日：2025-03-13

    申请号：US18464825

    申请日：2023-09-11

    Applicant: Huawei Technologies Co., Ltd.

    Inventor： Zhiping Jiang ,  Choloong Hahn ,  Junho Chang

    IPC: H04B10/58 ,  H04B10/2543 ,  H04B10/61

    Abstract: A method for monitoring generalized optical signal-to-noise ratio (gOSNR) is provided, which is applied to monitoring of an optical signal received by a coherent receiver through a fiber link. The method includes: obtaining a first received waveform; obtaining a signal part of the first received waveform; obtaining a noise part of the first received waveform according to the signal part and the first received waveform; obtaining a first correlation between the noise part and a first template at a predetermined location on the fiber link, the first correlation indicating a signal power at the predetermined location; obtaining a second correlation between the noise part and a second template at the predetermined location on the fiber link, the second correlation indicating a signal power and noise power at the predetermined location; and obtaining gOSNR at the predetermined location according to the first correlation and the second correlation.

    Method and apparatus for evaluating nonlinear impairment of an optical fiber link
    16.
    发明授权
    Method and apparatus for evaluating nonlinear impairment of an optical fiber link 有权

    公开(公告)号：US11190272B1

    公开(公告)日：2021-11-30

    申请号：US17127305

    申请日：2020-12-18

    Applicant: HUAWEI TECHNOLOGIES CO., LTD.

    Inventor： Zhiping Jiang

    IPC: H04B10/079 ,  H04B10/2537

    Abstract: There is provided a method and apparatus for evaluating nonlinear impairment of an optical fiber link. The method includes partitioning a natural span of the optical fiber link into multiple sub-spans, each of the multiple sub-spans determined based on chromatic dispersion (CD) equivalence; The method further includes for each of the multiple sub-spans, acquiring sub-span function parameters and a sub-span input power indicative of input power at a particular sub-span, the sub-span function parameters including noise variance and correlations between the particular sub-span and others of the multiple sub-spans. The method additionally includes determining the nonlinear impairment of the optical fiber link based on the sub-span input power and the sub-span function parameters acquired for each of the multiple sub-spans.

    Method and apparatus for object detection system
    17.
    发明授权
    Method and apparatus for object detection system 有权

    公开(公告)号：US11061113B2

    公开(公告)日：2021-07-13

    申请号：US17037844

    申请日：2020-09-30

    Applicant: HUAWEI TECHNOLOGIES CO., LTD.

    Inventor： Ali Ahmed Ali Massoud ,  Zhiping Jiang ,  Hongbiao Gao

    IPC: G01S7/41 ,  G01S13/04 ,  G01S13/524 ,  G01S7/292

    Abstract: The disclosed systems, structures, and methods are directed to an object detection system, employing a receiver configured to receive a signal reflected from an object, an analog-to-digital converter (ADC) configured to convert the received signal into a digital signal, a pre-processor configured to improve a signal-to-noise (SNR) of the digital signal and to generate a pre-processed signal corresponding to the digital signal, a parameter extractor configured to calculate a number of reference cells M and a multiplication factor K0, and a Constant False Alarm Rate (CFAR) processor configured to analyze a cell-under-test (CUT) and M reference cells in accordance with the number of reference cells M and the multiplication factor K0 to detect the presence of the object.

    SYSTEM AND METHOD FOR PILOT DATA DETECTION USING CORRELATION PEAK TRACKING
    18.
    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.

    Apparatus and method for OTDR transmitter noise compensation
    20.
    发明授权
    Apparatus and method for OTDR transmitter noise compensation 有权

    公开(公告)号：US09712232B2

    公开(公告)日：2017-07-18

    申请号：US14872484

    申请日：2015-10-01

    Applicant: Huawei Technologies Co., Ltd.

    Inventor： Zhiping Jiang ,  Demin Yao ,  Xiaodong Luo ,  Yansui Huang

    IPC: H04B10/071 ,  G01M11/00 ,  H04B10/077

    CPC classification number: H04B10/0775 ,  G01M11/00 ,  G01M11/3118 ,  H04B10/071

    Abstract: An optical device with integrated Optical Time Domain Reflectometer (OTDR) functionality and method for the same is provided. The optical device includes a transmitter and an Optical Time Domain Reflectometer (OTDR) module, The transmitter is configured to generate an Optical Time Domain Reflectometer (OTDR)-modulated optical supervisory channel (OSC) signal by applying an OTDR modulation to an optical supervisory channel (OSC) signal using an OTDR signal and to transmit the OTDR-modulated OSC signal. The OTDR module is configured to generate the OTDR signal, to monitor a returned light signal, to determine transmitter noise compensation information, and to generate OTDR trace information using transmitter noise compensation information and the monitored returned light signal.

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