-
公开(公告)号：US20190234832A1
公开(公告)日：2019-08-01
申请号：US16258588
申请日：2019-01-26
Applicant: NEC Laboratories America, Inc.
Abstract: Aspects of the present disclosure describe a multilayer coding method for physical value measurements in which a multi-pulse pattern is generated through several layers, each of which is encoded with a different cyclic codeword. The total coding gain is the product of the gains of each layer advantageously allowing a long cyclic codeword to be replaced by combining several short cyclic codewords. Of particular advantage, methods according to the present disclosure provide better signal-to-noise characteristics, longer sensing distances and lower computational complexity particularly suitable for high-performance and cost-effective distributed optical fiber sensing (DOFS).
-
62.发明授权公开(公告)号：US10345138B2
公开(公告)日：2019-07-09
申请号：US15385972
申请日：2016-12-21
Applicant: NEC Laboratories America, Inc.
Inventor： Giovanni Milione , Philip Nan Ji , Ezra Ip , Ting Wang
IPC: G01H9/00
Abstract: A system to perform distributed acoustic sensing (DAS) in an environment with acoustic vibrations present includes at least an optical fiber positioned in said environment, wherein the optical fiber comprises N spatial channels and N laser pulses are launched into the N spatial channels of the optical fiber and propagate over a fiber length; and one or more sensors to measure N signals of acoustic vibration amplitude and frequency from each of N spatial channels, wherein the N signals are digitally added for spatial averaging and applied to determine DAS.
-
公开(公告)号：US10291318B2
公开(公告)日：2019-05-14
申请号：US15964790
申请日：2018-04-27
Applicant: NEC Laboratories America, Inc.
Inventor： Ivan Djordjevic , Shaoliang Zhang , Ting Wang
IPC: H04B10/00 , H04B10/112 , H03M13/11 , H04L1/00 , H04L27/36 , H03M13/25 , G02B6/028 , H04B10/11 , H04B10/516 , H04L29/06 , H04J14/00 , H04B10/2581 , H04J14/04
Abstract: Aspects of the present disclosure describe physical layer security in optical communications wherein Bessel modes are employed and significantly outperform conventional schemes with respect to secrecy and advantageously benefit from atmospheric turbulence effects with beam splitting attacks.
-
公开(公告)号：US10205591B2
公开(公告)日：2019-02-12
申请号：US15897944
申请日：2018-02-15
Applicant: NEC Laboratories America, Inc.
Inventor： Ivan Djordjevic , Ting Wang , Shaoliang Zhang
IPC: H04L9/08 , H04B10/70 , H04J14/02 , H01Q3/34 , H01Q21/00 , H04L27/36 , H04L27/38 , H04B7/0413 , H04L27/34 , H04B10/11 , H01Q3/26 , H01Q3/28 , H01Q3/38
Abstract: Systems and methods for orbital angular momentum (OAM)-based multidimensional signaling with multiple-input-multiple-output (MIMO). The wireless communication is achieved using a transmitter including a plurality of orthogonal pulse shapers of a multidimensional modulator, the plurality of orthogonal pulse shapers generating a multidimensional modulated signal by imposing one or more data sequences on corresponding mutually orthogonal filter impulse responses derived from multiple orthogonal basis functions including Slepian sequences. An OAM antenna array including OAM antenna elements is used such that each of the OAM antenna elements includes an azimuthal phase shifter for shifting an azimuthal phase term of a wavefront generated by an antenna element such that the OAM antenna elements impose the multidimensional modulated signal on pre-determined OAM modes of a carrier signal corresponding to the azimuthal phase term.
-
公开(公告)号：US10162245B2
公开(公告)日：2018-12-25
申请号：US15596043
申请日：2017-05-16
Applicant: NEC Laboratories America, Inc.
Inventor： Philip Nan Ji , Ting Wang
Abstract: A sensing system adapted to receive backscattered signal from a sensing fiber includes a first Faraday rotator mirror; a second Faraday rotator mirror; an optical hybrid coupled to the Faraday rotator mirrors, wherein one of the mirrors is coupled with an optical path difference; a 3-port optical circulator coupled to the sensing fiber and the optical hybrid; a first photodetector coupled to the circulator; and three photodetectors coupled to the optical hybrid.
-
Patent Agency Ranking
公开(公告)号：US10113935B2
公开(公告)日：2018-10-30
申请号：US14975062
申请日：2015-12-18
Applicant: NEC Laboratories America, Inc.
Abstract: A method and system are provided. The method includes converting, using a spatial mode converter, an input signal into a plurality of spatial modes and performing polarization multiplexing and mode multiplexing, using a polarization multiplexer and a mode multiplexer, respectively, on the input signal. The method further includes injecting the input signal into a fiber optic medium. The method additionally includes applying, using at least one spatial filter in each of a forward and a backward direction within the fiber optic medium, the plurality of spatial modes within the fiber optic medium to transmit the input signal and perform distributed fault sensing on the input signal simultaneously.
-
公开(公告)号：US20180234139A1
公开(公告)日：2018-08-16
申请号：US15897944
申请日：2018-02-15
Applicant: NEC Laboratories America, Inc.
Inventor： Ivan Djordjevic , Ting Wang , Shaoliang Zhang
IPC: H04B7/0413 , H04L27/38 , H04L27/36 , H04L27/34
CPC classification number: H04B7/0413 , H01Q3/26 , H01Q3/28 , H01Q3/34 , H01Q3/38 , H01Q21/00 , H04B10/11 , H04B10/505 , H04B10/516 , H04B10/70 , H04J14/0227 , H04J14/0298 , H04J14/04 , H04L9/0852 , H04L27/3477 , H04L27/36 , H04L27/362 , H04L27/38
Abstract: Systems and methods for orbital angular momentum (OAM)-based multidimensional signaling with multiple-input-multiple-output (MIMO). The wireless communication is achieved using a transmitter including a plurality of orthogonal pulse shapers of a multidimensional modulator, the plurality of orthogonal pulse shapers generating a multidimensional modulated signal by imposing one or more data sequences on corresponding mutually orthogonal filter impulse responses derived from multiple orthogonal basis functions including Slepian sequences. An OAM antenna array including OAM antenna elements is used such that each of the OAM antenna elements includes an azimuthal phase shifter for shifting an azimuthal phase term of a wavefront generated by an antenna element such that the OAM antenna elements impose the multidimensional modulated signal on pre-determined OAM modes of a carrier signal corresponding to the azimuthal phase term.
-
68.发明授权公开(公告)号：US09866346B2
公开(公告)日：2018-01-09
申请号：US15279399
申请日：2016-09-28
Applicant: NEC Laboratories America, Inc.
Inventor： Philip Nan Ji , Ting Wang , Ryuji Aida
CPC classification number: H04J14/0212 , H04J14/0201 , H04J14/021 , H04J14/0297 , H04Q11/0005 , H04Q2011/0015 , H04Q2011/0058
Abstract: Aspects of the present disclosure describe systems, structures and methods providing fully reconfigurable optical add-drop multiplexing (ROADM) that provide redundancy protection against any two (2) simultaneous wavelength selective switch (WSS) failures with only four 2×1 WSS structures for both Eastbound and Westbound traffic, while not requiring bidirectional operation of the WSS structures.
-
69.发明申请公开(公告)号：US20170350734A1
公开(公告)日：2017-12-07
申请号：US15596043
申请日：2017-05-16
Applicant: NEC Laboratories America, Inc.
Inventor： Philip Nan Ji , Ting Wang
CPC classification number: G02F1/335 , G01D5/35306 , G01D5/35358 , G02F1/125
Abstract: A sensing system adapted to receive backscattered signal from a sensing fiber includes a first Faraday rotator mirror; a second Faraday rotator mirror; an optical hybrid coupled to the Faraday rotator mirrors, wherein one of the mirrors is coupled with an optical path difference; a 3-port optical circulator coupled to the sensing fiber and the optical hybrid; a first photodetector coupled to the circulator; and three photodetectors coupled to the optical hybrid.
-
公开(公告)号：US09813786B2
公开(公告)日：2017-11-07
申请号：US14607075
申请日：2015-01-28
Applicant: NEC Laboratories America, Inc.
Inventor： Neda Cvijetic , Akihiro Tanaka , Ting Wang
IPC: H04Q11/00 , H04J14/02 , H04L12/931 , H04L12/24 , H04L12/26
CPC classification number: H04Q11/0005 , H04J14/0256 , H04J14/0284 , H04L41/12 , H04L43/0811 , H04L49/00 , H04Q11/0062 , H04Q11/0067
Abstract: A method includes providing run-time optical 5G mobile fronthaul MFH topology re-configurability through software-defined control of both optical circuit switches and electrical packet switches readily accommodating unpredictable traffic patterns and low latency optical by-pass based device-to-device connectivity. The providing includes employing an optical any-to-any switch for wavelength-tunable and fixed-wavelength optical transceivers.
-
-
-
-
-
-
-
-
-
Search Results
273
records
(took 0.027 seconds)
