利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

23 条记录 (耗时 0.015 秒)

    OPTICAL NETWORK PERFORMANCE EVALUATION USING A HYBRID NEURAL NETWORK
    3.
    发明申请
    OPTICAL NETWORK PERFORMANCE EVALUATION USING A HYBRID NEURAL NETWORK 有权

    公开(公告)号：US20210111794A1

    公开(公告)日：2021-04-15

    申请号：US17106143

    申请日：2020-11-29

    申请人： NEC Laboratories America, Inc.

    发明人： Yue-Kai HUANG ,  Shaoliang ZHANG ,  Ezra IP ,  Jiakai YU

    IPC分类号： H04B10/079 ,  G06N3/04

    摘要： Aspects of the present disclosure describe systems, methods. and structures in which a hybrid neural network combining a CNN and several ANNs are shown useful for predicting G-ONSR for Ps-256QAM raw data in deployed SSMF metro networks with 0.27 dB RMSE. As demonstrated, the CNN classifier is trained with 80.96% testing accuracy to identify channel shaping factor. Several ANN regression models are trained to estimate G-OSNR with 0.2 dB for channels with various constellation shaping. Further aspects include the tuning of existing optical networks and the characterization of retrofit/upgraded optical networks to estimate capacity—both aspects employing our inventive hybrid neural network methodology.

    HIGH-SPEED OPTICAL 8-QAM MODULATION BY CASCADING DUAL-DRIVE MACH-ZEHNDER MODULATOR WITH I/Q MODULATOR
    4.
    发明申请
    HIGH-SPEED OPTICAL 8-QAM MODULATION BY CASCADING DUAL-DRIVE MACH-ZEHNDER MODULATOR WITH I/Q MODULATOR 有权
    具有I / Q调制器的双驱动MACH-ZEHNDER调制器的高速光学8-QAM调制

    公开(公告)号：US20130089340A1

    公开(公告)日：2013-04-11

    申请号：US13646465

    申请日：2012-10-05

    申请人： NEC LABORATORIES AMERICA, INC.

    发明人： Yue-Kai HUANG ,  Ezra IP ,  Dayou QIAN

    IPC分类号： H04B10/04

    CPC分类号： H04B10/541

    摘要： Structures and methods of generating 8-QAM signals through the effect of a cascaded I/Q modulator and Mach-Zhender modulator. The 8-QAM signals are generated by applying one binary sequence to the dual-drive Mach-Zehnder modulator (MZM) and two binary sequences to the I/Q modulator. Operationally, the I/Q modulator generates QPSK constellation(s), while the dual drive MZM either maintains the QPSK constellation at an out ring, or attenuates its amplitude to the inner ring and rotates its phase by π/4 phase depending on the binary data it was driven by.

    摘要翻译： 通过级联I / Q调制器和Mach-Zhender调制器的影响产生8-QAM信号的结构和方法。 通过将一个二进制序列应用于双驱动马赫 - 曾德调制器（MZM）并将两个二进制序列应用于I / Q调制器来生成8-QAM信号。 在操作上，I / Q调制器产生QPSK星座，而双驱动MZM或者将QPSK星座维持在外环，或者将其振幅衰减到内环，并且根据其中的相位旋转其相位 二进制数据由它驱动。

    DISTRIBUTED FIBER OPTIC SENSING ENABLED SELF-COHERENT DETECTION FOR DATA CENTERS
    5.
    发明申请
    DISTRIBUTED FIBER OPTIC SENSING ENABLED SELF-COHERENT DETECTION FOR DATA CENTERS 有权

    公开(公告)号：US20230119927A1

    公开(公告)日：2023-04-20

    申请号：US17966856

    申请日：2022-10-16

    申请人： NEC Laboratories America, Inc.

    发明人： Yue-Kai HUANG ,  Ezra IP

    IPC分类号： G01H9/00 ,  H04B10/2537 ,  H04B10/61

    摘要： Aspects of the present disclosure describe distributed fiber optic sensing (DFOS) systems, methods, and structures that advantageously sense/monitor intra-data center operations using self-coherent detection. Advantageously, sensing signal(s) and data signal(s) are optically multiplexed such that the sensing signal(s) are generated and detected using the same optoelectronic components as data generation and detection while requiring only minimal changes to transponder arrangements and no additional bandwidth to digital-to-analog converters (DAC) or analog-to-digital converters (ADC).

    DISTRIBUTED ACOUSTIC SENSING USING DYNAMIC RANGE SUPPRESSION
    8.
    发明申请
    DISTRIBUTED ACOUSTIC SENSING USING DYNAMIC RANGE SUPPRESSION 有权

    公开(公告)号：US20210356776A1

    公开(公告)日：2021-11-18

    申请号：US17316621

    申请日：2021-05-10

    申请人： NEC Laboratories America, Inc.

    发明人： Ezra IP ,  Yue-Kai HUANG ,  Philip JI ,  Shuji MURAKAMI

    IPC分类号： G02F1/125 ,  G01H9/00

    摘要： Aspects of the present disclosure describe improved distributed acoustic sensing using dynamic range suppression of optical time domain reflectometry either by using a feedback loop comprising optical and electrical elements or using a nonlinear element in the electrical domain after coherent detection. When using a feedback loop, the amplitude of the periodic waveform of coherent OTDR can be inverted. This allows optical pre-compensation of the received optical signal before coherent detection with the goal of minimizing amplitude dynamic range. Alternatively, a nonlinear element in the electrical domain can reduce amplitude dynamic range before sampling by analog-to-digital converters (ADC).

    COMPLEX AND PHASE DOMAIN VIBRATION STRENGTH ESTIMATION FOR COHERENT DISTRIBUTED ACOUSTIC SENSING
    9.
    发明申请
    COMPLEX AND PHASE DOMAIN VIBRATION STRENGTH ESTIMATION FOR COHERENT DISTRIBUTED ACOUSTIC SENSING 有权

    公开(公告)号：US20210356317A1

    公开(公告)日：2021-11-18

    申请号：US17317863

    申请日：2021-05-11

    申请人： NEC Laboratories America, Inc.

    发明人： Ezra IP ,  Junqiang HU ,  Yue-Kai HUANG

    IPC分类号： G01H9/00 ,  G01D5/353

    摘要： Aspects of the present disclosure describe a coherent distributed acoustic sensing (DAS) method employing a combined complex and phase domain vibration strength estimation are employed to produce a distributed acoustic sensing output signal exhibiting mitigated Rayleigh fading effect. Operationally, a phase-domain estimator is regulated by a complex-domain estimator that provides Rayleigh fading information associated with each DAS fiber segment, which in turn is used to determine if/how a phase-domain estimator is affected by fading. In the occurrence of severe fading, the complex-domain estimator is used to produce an indication of vibration strength, wherein noise occurring in that estimator is not amplified as would be in the phase-domain estimator.