公开(公告)号：US11563300B2

公开(公告)日：2023-01-24

申请号：US16569294

申请日：2019-09-12

申请人： Fujitsu Limited

发明人： Youichi Akasaka ,  Tadashi Ikeuchi

IPC分类号： H01S3/30 ,  H01S3/10

摘要： An optical system for suppressing signal noise on an optical fiber, including an input power signal; a pump laser configured to receive the input power signal; a phase modulator coupled to the pump laser configured to modulate, in response to the input power signal, a phase of the pump laser to increase a stimulated Brillouin scattering (SBS) threshold of the pump laser, wherein the pump laser is further configured to: increase a power at the pump laser to be greater than the SBS threshold; generate a back scattering power based on the power of the pump laser being greater than the increased SBS threshold; and limit an output power signal of the pump laser based on the generated back scattering power.

公开(公告)号：US20220012939A1

公开(公告)日：2022-01-13

申请号：US16927312

申请日：2020-07-13

申请人： Fujitsu Limited

发明人： Nannan Wang ,  Xi Wang ,  Qi Chen ,  Paparao Palacharla ,  Tadashi Ikeuchi

IPC分类号： G06T15/20 ,  G06T17/05 ,  G06K9/00 ,  G06T7/70 ,  G05D1/02

摘要： Systems and methods for provisioning real-time three-dimensional maps, including: at a first processing stage: updating a three-dimensional map of an environment based on received point cloud data; extracting three-dimensional proposals of objects of the environment; projecting the three-dimensional proposals onto a two-dimensional image of the environment; generating two-dimensional proposals of the objects of the environment; at a second processing stage: detecting the objects of the environment from the two-dimensional image of the environment; generating two-dimensional bounding boxes of the objects of the environment; matching the two-dimensional bounding box with a particular two-dimensional proposal of the two-dimensional proposals; and labeling, for each two-dimensional proposal that is matched to a two-dimensional bounding box, the three-dimensional proposal corresponding to the two-dimensional proposal with semantic information associated with the two-dimensional bounding box that is matched to the two-dimensional proposal to update the three-dimensional map.

公开(公告)号：US11063847B2

公开(公告)日：2021-07-13

申请号：US16106097

申请日：2018-08-21

申请人： Fujitsu Limited

发明人： Xi Wang ,  Paparao Palacharla ,  Tadashi Ikeuchi

IPC分类号： G06F15/16 ,  H04L12/26 ,  H04L12/24 ,  H04L29/08

摘要： Systems and methods for mapping service function chains to physical network resources include receiving a service function chain request specifying multiple service functions including a service access point, generating a service graph including service links between consecutive service functions, receiving resource information describing capabilities of physical network resources and a topology of the physical network, generating a resource graph including infra links between pairs of connected physical network resources, creating, dependent on the service graph and the resource graph, multiple solutions for mapping the service functions to the physical network resources, and outputting one or more mapping solutions. Each of generating the service graph, generating the resource graph, and creating the mapping solutions may be performed by one or instances of respective microservices that operate in parallel. The systems may also include respective microservice instances for creating end point mappings, creating infra node mappings, and pruning and ranking mapping solutions.

公开(公告)号：US10601517B1

公开(公告)日：2020-03-24

申请号：US16254012

申请日：2019-01-22

申请人： Fujitsu Limited

发明人： Inwoong Kim ,  Sebastiaan Anne René Goossens ,  Olga I. Vassilieva ,  Tadashi Ikeuchi

IPC分类号： H04B10/04 ,  H04B10/516 ,  H03M13/00 ,  H03M13/27 ,  H04B10/27

摘要： A system and method for probabilistic shaping of an eight-dimensional super-symbol in optical transport networks, including receiving binary data to be transmitted as an optical signal; mapping at least a portion of the binary data to symbols of a M-QAM constellation; generating a first four-dimensional symbol of the M-QAM constellation for a first symbol period, including applying probabilistic shaping to the first four-dimensional symbol; generating a second four-dimensional symbol of the M-QAM constellation for a second symbol period, the second symbol period consecutive to the first symbol period, wherein the first and the second four-dimensional symbols have i) an equal symbol energy and ii) a one-to-one relationship; and time interleaving the first symbol period and the second symbol period to generate an eight-dimensional super-symbol.

公开(公告)号：US10461881B2

公开(公告)日：2019-10-29

申请号：US16154503

申请日：2018-10-08

申请人： Fujitsu Limited

发明人： Inwoong Kim ,  Xi Wang ,  Olga Vassilieva ,  Paparao Palacharla ,  Tadashi Ikeuchi

IPC分类号： H04J14/02

摘要： Systems and methods for identifying a pair of nodes of a plurality of nodes of a virtual optical network (VON); identifying i) an optical route between the pair of nodes and ii) a desired availability of the optical route; determining a probability density function (PDF) of a signal-to-noise ratio (SNR) of a signal of the optical route; determining a SNR threshold such that an integration of the PDF of the SNR of the signal above the SNR threshold corresponds to the desired availability of the optical route; determining a plurality of spectral efficiencies that corresponds to the SNR threshold, each spectral efficiency of the plurality of spectral efficiencies associated with a respective modulation format of a plurality of modulation formats; and identifying a particular modulation format of the plurality of modulation formats that corresponds to a maximum spectral efficiency of the plurality of spectral efficiencies.

公开(公告)号：US10396899B1

公开(公告)日：2019-08-27

申请号：US16107141

申请日：2018-08-21

申请人： Fujitsu Limited

发明人： Inwoong Kim ,  Olga I. Vassilieva ,  Paparao Palacharla ,  Tadashi Ikeuchi

IPC分类号： H04B10/04 ,  H04B10/54

摘要： Systems and methods for constellation shaping of M-QAM modulation formats in optical transport networks may receive binary data to be transmitted as an optical signal and partition symbols of an M-QAM constellation in the complex plane into two non-overlapping subsets of symbols, The systems and methods may include assigning respective probabilities to each symbol in the first subset of symbols dependent on a target probability distribution for the first subset, mapping at least a portion of the received binary data to the symbols in the first subset, including generating a respective codeword for each symbol in the first subset, in a first symbol period, providing data representing the respective codewords mapped to the symbols in the first subset to an optical modulator for transmission, and refraining from providing any data representing codewords mapped to the symbols in the second subset to the optical modulator until a second symbol period.

公开(公告)号：US10389473B1

公开(公告)日：2019-08-20

申请号：US15964297

申请日：2018-04-27

申请人： Fujitsu Limited

发明人： Olga I. Vassilieva ,  Inwoong Kim ,  Tadashi Ikeuchi

IPC分类号： H04B10/25 ,  H04J14/02 ,  H04Q11/00 ,  H04B10/516

摘要： A disclosed method for extending reach in an adaptive optical network may include selecting, for an optical channel having a given target distance and a given maximum data rate, the modulation format having the highest spectral efficiency among modulation formats supported in the adaptive optical network that are suitable for optical channels having the given target distance and the given maximum data rate, determining a symbol rate for the optical channel dependent on characteristics of transmission media for the optical channel, determining a number of subcarriers for the optical channel corresponding to the determined symbol rate, and activating subcarrier multiplexing (SCM) for the optical channel. Activating SCM may include configuring transponders to transmit or receive the traffic in the optical channel using the selected modulation format and the determined number of subcarriers. The method may be implemented by a network management system of the optical network.

公开(公告)号：US10355779B2

公开(公告)日：2019-07-16

申请号：US15714420

申请日：2017-09-25

申请人： Fujitsu Limited

发明人： Inwoong Kim ,  Xi Wang ,  Martin Bouda ,  Olga Vassilieva ,  Qiong Zhang ,  Paparao Palacharla ,  Tadashi Ikeuchi

IPC分类号： H04J14/02 ,  H04B10/077 ,  H04B10/079 ,  H04Q11/00

摘要： A method for VON service with guaranteed availability may use probability density functions (PDF) of Q-factor to determine availability of physical links assigned to a virtual link in the VON. Then, a VON mapping may be performed based on the determined availabilities, among other factors.

公开(公告)号：US20190051159A1

公开(公告)日：2019-02-14

申请号：US15988151

申请日：2018-05-24

申请人： Fujitsu Limited

发明人： Nannan Wang ,  Xi Wang ,  Qiong Zhang ,  Paparao Palacharla ,  Tadashi Ikeuchi

IPC分类号： G08G1/01 ,  B60W30/18 ,  G05D1/00 ,  H04W4/46

摘要： Systems and methods for traffic congestion avoidance may use cooperative autonomous driving based on vehicle-to-vehicle communication to resolve deadlock conditions. The method may include automatically detecting, by a given autonomous vehicle, that the given vehicle is deadlocked, initiating, by the given vehicle, formation of a coordination group including the given vehicle, a front vehicle traveling in the same driving lane as the given vehicle, and an assistant autonomous vehicle traveling in a lane adjacent to the lane in which the given vehicle and the front vehicle are traveling, and sending, by the given vehicle using vehicle-to-vehicle communication, a cooperative driving task request to initiate actions by the autonomous vehicles in the coordination group to resolve the deadlock condition. The actions may include modifying a driving plan of an autonomous vehicle in the coordination group and initiating a speed negotiation with an autonomous vehicle in the coordination group.

公开(公告)号：US20180359047A1

公开(公告)日：2018-12-13

申请号：US15620407

申请日：2017-06-12

申请人： Fujitsu Limited

发明人： Olga Vassilieva ,  Inwoong Kim ,  Tadashi Ikeuchi

IPC分类号： H04J14/02 ,  H04B10/50 ,  H04L27/00 ,  H04B10/079 ,  H04Q11/00

CPC分类号： H04J14/0298 ,  H04B10/07953 ,  H04B10/505 ,  H04B10/5057 ,  H04J14/0224 ,  H04L27/0012 ,  H04Q11/0066 ,  H04Q2011/0083

摘要： Methods and systems for reach extension of multi-carrier channels using unequal subcarrier spacing may decrease FWM by grouping the subcarriers into groups of 2 subcarriers, and apply a secondary, unequal spacing between the groups. In this manner, nonlinear interactions may be reduced and the transmission reach of a multi-carrier channel may be extended.