-
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.
-
4.发明申请公开(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
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：US09733108B2
公开(公告)日：2017-08-15
申请号：US14975252
申请日：2015-12-18
Applicant: NEC Laboratories America, Inc.
Inventor： Neda Cvijetic , Giovanni Milione , Ezra Ip , Ting Wang
CPC classification number: G01D5/34 , G01B11/002 , G01S7/4814 , G01S17/58 , G01S17/66 , G06F3/017 , G06F3/0304
Abstract: A method and system for remote sensing using optical orbital angular momentum (OAM)-based spectroscopy for lateral motion detection. The method includes applying an OAM mode on a light beam to generate an OAM light beam, the OAM light beam having an optical OAM spectrum, applying an OAM optical beam tilt on the OAM light beam to generate a tilted OAM light beam, transmitting the tilted OAM light beam on a remote object, such that the remote object interacts with the tilted OAM light beam, receiving a reflected OAM spectrum associated with the remote object, the reflected OAM spectrum having power values of OAM modes on opposite sides of an OAM launch mode, and displaying lateral motion of the remote object based on the reflected OAM spectrum by comparing the power values.
-
Patent Agency Ranking
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
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：US12135234B2
公开(公告)日：2024-11-05
申请号：US17967812
申请日：2022-10-17
Applicant: NEC Laboratories America, Inc.
Inventor： Ezra Ip , Yue-Kai Huang
IPC: G01H9/00 , G01D5/26 , G01D5/353 , H04L27/227
Abstract: Aspects of the present disclosure directed to frequency drift compensation for coded-DAS systems that use chirped pulses as a probe signal. Our inventive approach estimates timing jitter by correlating the amplitude of the estimated Rayleigh impulse response of every frame with a reference frame, and then re-aligns each frame by the estimated timing jitter. As the amount of timing jitter varies within a frame, every frame is divided into blocks where all samples have similar timing jitter, and perform timing jitter estimation and compensation on a block-by-block, frame-by-frame basis using an overlap-and-save method. Tracking of a slowly changing channel is enabled by allowing the reference frame to be periodically updated.
-
8.发明授权公开(公告)号：US11378443B2
公开(公告)日：2022-07-05
申请号：US16879407
申请日：2020-05-20
Applicant: NEC Laboratories America, Inc.
Inventor： Ezra Ip , Yue-Kai Huang
IPC: H04B10/08 , H04B17/00 , G01H9/00 , H04B10/071 , G01B9/0209
Abstract: Aspects of the present disclosure describe systems, methods and apparatus for improving the performance of Rayleigh-based phase-OTDR with correlation-based diversity combining and bias removal.
-
公开(公告)号：US10404398B2
公开(公告)日：2019-09-03
申请号：US15912781
申请日：2018-03-06
Applicant: NEC LABORATORIES AMERICA, INC.
Inventor： Ezra Ip , Yue-Kai Huang , Shuji Murakami , Philip Ji
Abstract: Aspects of the present disclosure describe systems, methods, and structures for passive optical add/drop multiplexing (POADM) architectures that remove the prior art requirement of an optical amplifier (i.e., repeater-less) at the POADM nodes.
-
公开(公告)号：US10107651B2
公开(公告)日：2018-10-23
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
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.
-
-
-
-
-
-
-
-
-
Search Results
44
records
(took 0.017 seconds)
