公开(公告)号：US08798480B2

公开(公告)日：2014-08-05

申请号：US13646465

申请日：2012-10-05

Applicant: NEC Laboratories America, Inc.

Inventor： Yue-Kai Huang ,  Ezra Ip ,  Dayou Qian

IPC: H04B10/04 ,  H04B10/54

CPC classification number: H04B10/541

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US11566937B2

公开(公告)日：2023-01-31

申请号：US16879505

申请日：2020-05-20

Applicant: NEC Laboratories America, Inc.

Inventor： Ezra Ip ,  Yue-Kai Huang ,  Junqiang Hu ,  Shuji Murakami

IPC: G01H9/00 ,  G01B9/02015 ,  G01B9/02 ,  G01D5/353 ,  G01V1/18

Abstract: Aspects of the present disclosure describe Rayleigh fading mitigation via short pulse coherent distributed acoustic sensing with multi-location beating-term combination. In illustrative configurations, systems, methods, and structures according to the present disclosure employ a two stage modulation arrangement providing short interrogator pulses resulting in a greater number of sensing data points and reduced effective sectional length. The increased number of data points are used to mitigate Rayleigh fading via a spatial combining process, multi-location-beating combining (MLBC) which uses weighted complex-valued DAS beating results from neighboring locations and aligns phase signals of each of the locations, before combining them to produce a final DAS phase measurement. Since Rayleigh scattering is a random statistic, the MLBC process allows capture of different statics from neighboring locations with correlated vibration/acoustic signal. The combined DAS results minimize a total Rayleigh fade, in both dynamic fading and static fading scenarios.

公开(公告)号：US10887009B2

公开(公告)日：2021-01-05

申请号：US16596582

申请日：2019-10-08

Applicant: NEC Laboratories America, Inc.

Inventor： Yue-Kai Huang ,  Shaoliang Zhang ,  Ezra Ip ,  Jiakai Yu

IPC: G06N3/08 ,  G06N3/04 ,  H04L27/34 ,  H04B10/07 ,  H04B10/079

Abstract: 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.

公开(公告)号：US10741992B2

公开(公告)日：2020-08-11

申请号：US15724755

申请日：2017-10-04

Applicant: NEC Laboratories America, Inc.

Inventor： Ezra Ip ,  Yue-Kai Huang ,  Fatih Yaman ,  Shaoliang Zhang

IPC: H01S3/23 ,  H01S3/094 ,  H04B10/291 ,  H04B10/293 ,  H01S3/067 ,  H01S3/16 ,  H01S3/30

Abstract: An unrepeatered transmission system includes a receiver coupled to a receive span; a transmitter coupled to the receive span; and a plurality of cascaded amplifiers in the receive span with dedicated fiber cores to supply one or more optical pumps from the receiver to each amplifier, wherein the plurality of cascaded amplifiers increase system reach by increasing the length of a back span in an unrepeatered link.

公开(公告)号：US20180136016A1

公开(公告)日：2018-05-17

申请号：US15811061

申请日：2017-11-13

Applicant: NEC Laboratories America, Inc.

Inventor： Fatih Yaman ,  Shaoliang Zhang ,  Ezra Ip ,  Yue-Kai Huang ,  Giovanni Milione

IPC: G01D5/353 ,  G01M11/00

CPC classification number: G01D5/35364 ,  G01M11/3118 ,  G01M11/3145 ,  G01M11/3154

Abstract: Methods and systems for Brillouin optical time-domain reflectometry include optically filtering out non-Brillouin signals reflected from a fiber. Brillouin signals reflected from the fiber are coupled with a local oscillator to produce a Brillouin shift signals. The Brillouin shift signals are converted to an electrical domain using a photodetector. The electrical Brillouin shift signals are converted to a digital domain using a low-speed analog-to-digital converter that has a sampling rate below a Nyquist rate sufficient to fully resolve the electrical Brillouin shift signals.

公开(公告)号：US20180103374A1

公开(公告)日：2018-04-12

申请号：US15694209

申请日：2017-09-01

Applicant: NEC Laboratories America, Inc.

Inventor： Yue-Kai Huang ,  Yechi Ma

IPC: H04W12/06 ,  H04L9/32

CPC classification number: H04W12/06 ,  G09C1/00 ,  H04L9/3278 ,  H04L63/0876 ,  H04L2209/805 ,  H04W12/00504 ,  H04W88/08

Abstract: A computer-implemented method for authenticating an access point attempting to access a wireless network is presented. The computer-implemented method includes receiving an authentication challenge from the access point, analyzing the authentication challenge at a wireless node by using an optical chaos generation module having an optical section and a radio frequency (RF) section to facilitate reproducibility, unpredictability, and unclonability of challenge-response pairs, and transmitting an authentication response to the access point.

公开(公告)号：US09866928B2

公开(公告)日：2018-01-09

申请号：US14934078

申请日：2015-11-05

Applicant: NEC Laboratories America, Inc.

Inventor： Yue-Kai Huang ,  Shaoliang Zhang ,  Fatih Yaman ,  Ting Wang

IPC: H04B10/61 ,  H04B10/516 ,  H04Q11/00 ,  H04J14/02

CPC classification number: H04Q11/0001 ,  H04B10/516 ,  H04B10/613 ,  H04B10/616 ,  H04B10/6166 ,  H04J14/0298

Abstract: Systems and methods are disclosed for data communication by performing RF sub-band multiplexing and demultiplexing by cascading a radio-frequency (RF) mixing module and optical dual-polarized (DP) QPSK modulator forhybrid RF/optical IQ modulation; and performing intra-transceiver optical superchannel switching through the RF sub-band multiplexing.

公开(公告)号：US20170214463A1

公开(公告)日：2017-07-27

申请号：US15385944

申请日：2016-12-21

Applicant: NEC Laboratories America, Inc.

Inventor： Giovanni Milione ,  Philip Nan Ji ,  Ezra Ip ,  Shaoliang Zhang ,  Yue-Kai Huang ,  Ting Wang

IPC: H04B10/25 ,  H04J14/06 ,  H04B10/2581 ,  H04B10/40 ,  H04B7/04 ,  H04J14/02 ,  H04L5/14

CPC classification number: H04B10/2503 ,  H04B7/0413 ,  H04B10/2581 ,  H04B10/40 ,  H04J14/02 ,  H04J14/06 ,  H04L5/14

Abstract: Systems and methods for optical communication are disclosed that include communicating data using one or more transceiver pairs coupled to a spatial-multiplexer (S-MUX); performing bi-directional transmissions over an elliptical core optical fiber to a spatial-demultiplexer (S-DEMUX) using spatial modes to communicate data in either direction between two transceiver pairs with low crosstalk and without optical circulators or wavelength-division multiplexing (WDM); and communicating data from the S-DEMUX with g one or more transceiver pairs.

公开(公告)号：US09654249B2

公开(公告)日：2017-05-16

申请号：US14846348

申请日：2015-09-04

Applicant: NEC Laboratories America, Inc.

Inventor： Yue-Kai Huang ,  Shaoliang Zhang ,  Fatih Yaman

IPC: H04B10/04 ,  H04J14/06 ,  H04B10/61 ,  H04B10/29

CPC classification number: H04J14/06 ,  H04B10/29 ,  H04B10/61

Abstract: A method of wavelength conversion without polarization tracking is provided. A system is also provided that converts an input signal into an output signal of a different wavelength that contains all of the amplitude, phase, and polarization information of the original signal. The method includes separating, using a polarization-diversity optical mixer, an input optical signal of a first wavelength into a plurality of electrical signals containing amplitudes and phases while maintaining the polarization information of the input signal, converting each of the amplitudes and phases into individual photo-currents using a photo-diode, converting each of the output photo-currents into voltages using an amplifier, modulating the multitude of voltages to a second wavelength using a modulator, where the separated electrical signals are up-converted to generate an output optical signal that maintains the same amplitude, phase, and polarization information as was contained in the input signal.

公开(公告)号：US20150215048A1

公开(公告)日：2015-07-30

申请号：US14607067

申请日：2015-01-27

Applicant: NEC Laboratories America, Inc.

Inventor： Shaoliang Zhang ,  Fatih Yaman ,  Yue-Kai Huang

IPC: H04B10/564 ,  H04B10/54 ,  H04B10/079

CPC classification number: H04B10/50575 ,  H04B10/5561 ,  H04B10/588

Abstract: An automatic bias control tracking for all modulation formats in an optical modulator includes monitoring the average output optical power using a low-speed photodetector to adjust the modulator bias. Two-level DC dithering signals are applied to two DC ports individually in time to isolate the impact of the other port while adjusting the current DC bias, thus improving the accuracy and efficiency. The power monitoring of low-frequency RF power is utilized to find a quad-point, where the in-phase and quadrature are orthogonal with each other. The total output power is used as a rule when adjusting the phase bias.

Abstract translation: 用于光调制器中的所有调制格式的自动偏置控制跟踪包括使用低速光电检测器来监测平均输出光功率以调整调制器偏压。 两级DC抖动信号及时分别应用于两个DC端口，以隔离其他端口的影响，同时调整电流直流偏置，从而提高精度和效率。 利用低频RF功率的功率监控来找到四点，其中同相和正交相互正交。 在调整相位偏置时，总输出功率通常被使用。