公开(公告)号：US20190334616A1

公开(公告)日：2019-10-31

申请号：US16504262

申请日：2019-07-06

Applicant: HUAWEI TECHNOLOGIES CO., LTD

Inventor： Jian ZHONG ,  Zhiping Jiang ,  Rui He

IPC: H04B10/077 ,  H04B10/27 ,  G01M11/00

Abstract: The application provides a method for measuring a dispersion coefficient of an optical fiber. A network device sends a first optical supervisory channel (OSC) measurement signal and a second OSC measurement signal, where wavelengths of the first OSC measurement signal and the second OSC measurement signal are different. The network device receives the returned first OSC measurement signal and second OSC measurement signal, where the first OSC measurement signal and the second OSC measurement signal are transmitted through a first optical fiber and a second optical fiber to return to the network device, and the first optical fiber and the second optical fiber are a to-be-tested optical fiber. The network device determines a delay difference between the received first OSC measurement signal and second OSC measurement signal. The network device determines a dispersion coefficient of the to-be-tested optical fiber based on the delay difference.

公开(公告)号：US10256901B2

公开(公告)日：2019-04-09

申请号：US15665351

申请日：2017-07-31

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Zhiping Jiang ,  Xuefeng Tang

IPC: H04B17/00 ,  H04B10/079

Abstract: A system for monitoring optical signal-to-noise ratio (OSNR) is provided. In some specific examples, the system may use a pilot tone power of a signal modulated with pilot tone to derive the pure signal power and the variance of the whole electric field to derive the total power (pure signal power plus amplified spontaneous emission (ASE) power of the signal). The ASE power can be obtained by subtracting the pure signal power from the total power (ASE+pure signal). Once the ASE power and the pure signal power are known, the OSNR can be calculated.

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.

公开(公告)号：US20180328709A1

公开(公告)日：2018-11-15

申请号：US15590168

申请日：2017-05-09

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Zhiping Jiang

IPC: G01B9/02 ,  G06F17/15 ,  G01D5/247 ,  H04B10/079 ,  G01B11/00

Abstract: In some examples, an apparatus receives a first measurement of a plurality of wavelength channels obtained at a first location of an optical medium, and a second measurement of the plurality of wavelength channels obtained at a second location of the optical medium. The apparatus computes a value relating to dispersion in the optical medium by correlating the first measurement and the second measurement.

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.

公开(公告)号：US09363583B2

公开(公告)日：2016-06-07

申请号：US14142392

申请日：2013-12-27

Applicant: Huawei Technologies Co., Ltd.

Inventor： Zhiping Jiang ,  Jian Zhong

IPC: H04B10/2537 ,  H04Q11/00 ,  H04J14/02

CPC classification number: H04Q11/0005 ,  H04B10/2537 ,  H04J14/0212 ,  H04J14/0221 ,  H04J14/0224 ,  H04J14/0272 ,  H04Q11/0066 ,  H04Q2011/0049 ,  H04Q2011/0083

Abstract: System, apparatus, and method embodiments are provided for suppressing the stimulated Raman scattering (SRS) crosstalk in multiple wavelength channel signals propagating in fiber links, such as in WDM/DWDM or other optical communications systems. The SRS is reduced or suppressed by separating the channels into two sets of different channels, such as even and odd channels, and then performing subtraction of signal amplitudes between the two sets of channels. The channels are separated by an interleaver into the two sets. Alternatively, a wavelength selective switch (WSS) is used to separate the channels into the two sets on which the subtraction of signal amplitudes is then performed. In an embodiment, the signals are low frequency modulation signals used for channel monitoring for optical communications systems.

Abstract translation: 提供了系统，装置和方法实施例，用于抑制在诸如WDM / DWDM或其他光通信系统中的光纤链路中传播的多个波长信道信号中受激拉曼散射（SRS）串扰。 通过将信道分离成两组不同的信道，例如偶数和奇数信道，然后在两组信道之间执行信号幅度的减法来减小或抑制SRS。 通道由交织器分成两组。 或者，使用波长选择开关（WSS）将信道分离成在其中执行信号幅度减法的两组中。 在一个实施例中，信号是用于光通信系统的信道监测的低频调制信号。