公开(公告)号：US12267105B2

公开(公告)日：2025-04-01

申请号：US18161386

申请日：2023-01-30

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Zhiping Jiang

IPC: H04B10/077 ,  H04L5/00

Abstract: The disclosed systems and methods are for monitoring optical performance in a spatial division multiplexing (SDM) system, comprising: i) extracting, by an optical coupler, at least a portion of a plurality optical signals propagating in different communication lanes of the SDM-based optical communication system, wherein each optical signal of the plurality of optical signals is modulated with a distinguishable pilot tone (PT) signal; ii) combining, by the optical coupler, the extracted portion of the plurality of optical signals, and generate a combined optical signal; iii) extracting, by a pilot tone detector (PTD), PT signals from the combined optical signal; iv) determining, by the PTD, optical signal specific information included in the PT signals; and v) computing, by the PTD, optical power of each optical signal based on the optical signal specific information.

公开(公告)号：US12074772B2

公开(公告)日：2024-08-27

申请号：US17155256

申请日：2021-01-22

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Zhiping Jiang ,  Yuren You ,  Mahdi Hemmati ,  Abbas Javadtalab

IPC: H04L41/147 ,  G06N5/04 ,  G06N20/00 ,  G06Q10/067 ,  H04L41/14 ,  H04L43/55 ,  G06Q10/0637 ,  G06Q10/0639 ,  G06Q40/08

CPC classification number: H04L41/147 ,  G06N5/04 ,  G06N20/00 ,  G06Q10/067 ,  H04L41/145 ,  H04L43/55 ,  G06Q10/06375 ,  G06Q10/0639 ,  G06Q40/08

Abstract: The disclosed systems, structures, and methods are directed to risk assessment of an optical network. A simulation framework includes a risk map engine including a performance prediction engine that generates a simulation of the optical network based at least in part on an input network topology and/or service map. The prediction performance engine runs the simulation to predict, based at least in part on received network telemetry data, direct and indirect impacts on the optical network of a risk factor represented in a what-if scenario. The risk map engine includes a risk assessment engine that determines a risk associated with the risk factor based at least in part on the predicted direct and indirect impacts and on a likelihood of occurrence of the risk factor. The risk assessment engine generates a risk map showing aggregate risks to the optical network from a plurality of risk factors.

公开(公告)号：US11811498B2

公开(公告)日：2023-11-07

申请号：US17319751

申请日：2021-05-13

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Zhiping Jiang ,  Jiachuan Lin

IPC: H04J14/02

CPC classification number: H04J14/0227

Abstract: Aspects of the disclosure provide for methods and systems for feedback control of mode MUX and DEMUX. An aspect of the disclosure provides for a method associated with a mode MUX. The method includes modulating each WDM signal of a first set of WDM signals with a pilot tone of different frequency. The method further includes spatially multiplexing the first set of WDM signals to generate a multi-mode signal. The method further includes detecting the pilot tones from the multi-mode signal. The method further includes tuning the mode MUX based on the detecting. Another aspect of the disclosure provides for a method associated with a mode DEMUX. The method includes spatially demultiplexing a multi-mode signal into a set of WDM signals. The method further incudes detecting pilot tones from the set of WDM signals and tuning the mode DEMUX based on the detecting.

公开(公告)号：US11791925B2

公开(公告)日：2023-10-17

申请号：US17521128

申请日：2021-11-08

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Zhiping Jiang

IPC: H04B10/07 ,  H04J14/02 ,  H04B10/079

CPC classification number: H04J14/0227 ,  H04B10/0795 ,  H04J14/0221

Abstract: There is provided a method, apparatus and system for determining multipath interference (MPI) in optical communications. It is object of embodiments of the present disclosure to provide an effective, low-cost way of detecting or measuring MPI. To effectively detect and measure the MPI, multiple zero-power gaps are inserted into the transmission signal (optical signal) in time domain. In some embodiments, at least some of the zero-power gaps inserted in the main signal do not overlap the zero-power gaps of the reflection of the main signal. Using the zero-power gaps contained the main signal and the reflection (where applicable), power inside and outside the zero-power gaps are determined. Then, the strength of the MPI is determined based on the determined power inside and outside the zero-power gaps.

公开(公告)号：US11539431B1

公开(公告)日：2022-12-27

申请号：US17577488

申请日：2022-01-18

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Zhiping Jiang ,  Junho Chang ,  Choloong Hahn

IPC: H04B10/079

Abstract: The disclosed systems and methods for optical filter fault localization. The optical filter fault localization is based on: i) determining an accumulated noise density at frequencies where ASE noise is filtered out by a faulty optical filter in an optical signal; ii) comparing the accumulated noise density with predicted accumulated noise densities, the predicted accumulated noise densities representing noises predicted from a plurality of optical filters to a receiver; and iii) determining, based on the comparison of the accumulated noise density and the predicted accumulated noise densities, a location of the faulty optical filter.

公开(公告)号：US11271646B1

公开(公告)日：2022-03-08

申请号：US17126991

申请日：2020-12-18

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Zhiping Jiang

IPC: H04J14/02 ,  H04B10/079 ,  H04B10/61 ,  H04B10/25

Abstract: The disclosed systems and methods are directed to monitor optical performance comprising receiving optical channel signals, wherein the optical channel signals are superimposed with pilot tone (PT) signals, operating a local oscillator (LO) including a tunable laser in a coarse scanning mode and a fine scanning mode and generate different LO signals in accordance with the mode in which the LO is being operated, combining the optical channel signals with at least one LO signal generated by the LO and generating a combined optical signal, detecting and converting the combined optical signal into an electrical signal, amplifying the electrical signal, converting the amplified electrical signal into a digital signal, processing the digital signal and extracting channel specific information included in the PT signals, computing channel power based on the channel specific information, and maintaining a management table.

公开(公告)号：US11050487B2

公开(公告)日：2021-06-29

申请号：US16927245

申请日：2020-07-13

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Zhiping Jiang ,  Xuefeng Tang ,  Haitao Sun

IPC: H04B10/079 ,  H04B10/572 ,  H04J14/02 ,  H04B10/50

Abstract: The disclosed systems, apparatuses and methods are directed to controlling a difference between a first center frequency of a first optical subcarrier and a second center frequency of a second optical subcarrier of an optical super-channel signal in an optical network. The method comprises modulating the first optical subcarrier at a first optical side component frequency with a first side modulation frequency and modulating the second optical subcarrier at a second optical side component frequency with a second side modulation frequency. The method further comprises detecting a radio-frequency (RF) power at a modulated beat frequency tone in the modified optical signal.

公开(公告)号：US10469163B2

公开(公告)日：2019-11-05

申请号：US16013124

申请日：2018-06-20

Applicant: Huawei Technologies Co., Ltd.

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

IPC: H04B10/077 ,  H04B10/516 ,  H04B10/69 ,  H04J14/02

Abstract: A system monitors optical performance of an optical link within an optical network. The system includes an optical transmitter having an expanded-spectrum pilot-tone modulator for modulating an expanded-spectrum pilot tone onto a high-speed data signal to generate an expanded-spectrum optical signal and an optical receiver for receiving the expanded-spectrum optical signal and for detecting and decoding the expanded-spectrum pilot tone to enable monitoring of the optical performance of the optical link.

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.

公开(公告)号：US20190109667A1

公开(公告)日：2019-04-11

申请号：US15995175

申请日：2018-06-01

Applicant: Huawei Technologies Co., Ltd.

Inventor： Zhiping Jiang ,  Xuefeng Tang ,  Zhuhong Zhang

IPC: H04J14/02 ,  H04B10/54

Abstract: An embodiment method includes multiplexing light emitted by the plurality of optical transmitters to provide a multiplexed optical signal; propagating the multiplexed optical signal through an optical interleaver from a first port thereof to a combined port thereof and back to a second port thereof; and detecting an optical signal at the second port of the optical interleaver.