Patents by Inventor Shigeyuki Yanagimachi

Shigeyuki Yanagimachi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20220303039
    Abstract: An optical network management device (100) which assigns a path from a transmitting node to a receiving node in an optical network system including a multi-core optical fiber, includes at least one processor, the processor being configured to carry out: a core extraction process of extracting a core constituting the path; and a path assignment process of selecting, in accordance with an attribute of the path, a wavelength to which the path is to be assigned, the multi-core optical fiber having an optical amplifier attached thereto, the optical amplifier having an amplification gain that is larger in a first wavelength region than in a second wavelength region, the path assignment process including preferentially assigning, to the first wavelength region, the path having a specific attribute.
    Type: Application
    Filed: March 16, 2022
    Publication date: September 22, 2022
    Applicant: NEC Corporation
    Inventor: Shigeyuki YANAGIMACHI
  • Patent number: 11398711
    Abstract: A multicore optical fiber amplifier according to an exemplary aspect of the present invention includes a multicore optical fiber amplification medium including, in a clad, a plurality of cores doped with a rare earth element; signal light introduction means for introducing, into each of the plurality of cores, signal light with a wavelength included in a gain band of the multicore optical fiber amplification medium; excitation light introduction means for introducing, into the clad, excitation light for exciting the multicore optical fiber amplification medium; and control light introduction means for introducing control light into each of the plurality of cores, wherein the control light introduction means introduces the control light into a non-signal core into which the signal light is not being introduced, among the plurality of cores, only when the excitation light is being introduced.
    Type: Grant
    Filed: January 19, 2018
    Date of Patent: July 26, 2022
    Assignee: NEC CORPORATION
    Inventors: Shigeru Nakamura, Emmanuel Le Taillandier De Gabory, Shigeyuki Yanagimachi
  • Patent number: 11374377
    Abstract: It is necessary to reduce the power consumption of a plurality of optical amplifiers when there is a difference in the required pumping power between the plurality of optical amplifiers; therefore, an optical amplifying apparatus according to an exemplary aspect of the invention includes a plurality of optical amplifying means for amplifying a plurality of optical signals, each of the plurality of optical amplifying means including a gain medium; a plurality of laser light generating means for generating a plurality of laser beams; at least one optical coupling means for coupling the plurality of laser beams variably in accordance with a coupling factor and outputting a plurality of excitation light beams, each of the plurality of excitation light beams exciting the gain medium; and controlling means for controlling the coupling factor and an output power of each of the plurality of laser light generating means.
    Type: Grant
    Filed: April 20, 2017
    Date of Patent: June 28, 2022
    Assignee: NEC CORPORATION
    Inventors: Emmanuel Le Taillandier De Gabory, Shigeyuki Yanagimachi, Shigeru Nakamura, Keiichi Matsumoto
  • Publication number: 20220173962
    Abstract: High-speed control of disaggregated network systems is implemented. A control device includes a main memory and an interface. The main memory shares management information contained in memory spaces possessed by a plurality of respective component devices connected and stores the management information as integrated management information. When the management information is to be updated, the interface transmits an update signal for updating the management information to the component devices and receives a response signal to the update signal from the component devices.
    Type: Application
    Filed: February 28, 2020
    Publication date: June 2, 2022
    Applicant: NEC CORPORATION
    Inventors: Shigeyuki YANAGIMACHI, Akio TAJIMA, Kiyo ISHII, Syu NAMIKI
  • Publication number: 20220166179
    Abstract: It is difficult to construct an optical fiber transmission system enabling relay optical amplification using a coupled multi-core optical fiber as an optical transmission path; therefore, an optical amplification device includes first optical spatial layout converting means for converting a spatial layout of a plurality of optical signal beams propagating through each of a plurality of cores, from a coupled state in which optical signal beams interfere between a plurality of cores to a non-coupled state in which optical signal beam interference is reduced between a plurality of cores; optical amplifying means for amplifying, in the non-coupled state, the plurality of optical signal beams with the non-coupled state and generating a plurality of amplified optical signal beams; and second optical spatial layout converting means for converting a spatial layout of the plurality of amplified optical signal beams from the non-coupled state to the coupled state.
    Type: Application
    Filed: April 2, 2020
    Publication date: May 26, 2022
    Applicant: NEC Corporation
    Inventors: Hitoshi TAKESHITA, Keiichi MATSUMOTO, Shigeyuki YANAGIMACHI
  • Patent number: 11329444
    Abstract: To solve the problem that the power consumption of optical amplifiers is not optimized over the life time of an amplifier, the optical amplifier includes a gain medium for amplifying a plurality of optical channels, the gain medium including a plurality of cores through which the plurality of optical channels to propagate respectively and a cladding area surrounding the plurality of cores, a monitor that monitors the temperature of the optical amplifier and producing a monitoring result, a first light source that emits a first light beam to excite the cladding area, a second light source that emits a plurality of second light beams to excite each of the plurality of cores individually, and a controller that controls the first light source and the second light source based on the produced monitoring result.
    Type: Grant
    Filed: September 20, 2016
    Date of Patent: May 10, 2022
    Assignee: NEC CORPORATION
    Inventors: Emmanuel Le Taillandier de Gabory, Shigeru Nakamura, Shigeyuki Yanagimachi, Keiichi Matsumoto
  • Publication number: 20220115830
    Abstract: The present invention provides an optical amplifier and a control method therefor, with which it is possible to stably control an optical amplifier that uses a multicore optical fiber. The optical amplifier uses, in a gain medium, a multicore optical fiber having a plurality of cores, and comprises: an input-light power monitor that monitors the optical power of input light to the plurality of cores of the multicore optical fiber; an output-light power monitor that monitors the optical power of medium-passed output light from the plurality of cores that has passed through the multicore optical fiber; a crosstalk monitor that monitors the amount of inter-core crosstalk among the plurality of cores; and a controller that controls the pump-light power of pump light superimposed on the input light to the plurality of cores on the basis of the monitored optical power of input light, the monitored optical power of output light, and the monitored amount of inter-core crosstalk.
    Type: Application
    Filed: February 19, 2020
    Publication date: April 14, 2022
    Applicant: NEC Corporation
    Inventors: Shigeyuki YANAGIMACHI, Emmanuel LE TAILLANDIER DE GABORY
  • Publication number: 20220045473
    Abstract: The optical amplifier, which amplifies wavelength multiplexed signal light, comprises: a multi-core optical fiber which includes cladding and a first core and a second core disposed in the cladding, and which is doped with rare-earth ions; an excitation light source for supplying excitation light to the cladding of the multi-core optical fiber; and a wavelength demultiplexing means for separating the wavelength bands of the wavelength multiplexed signal light that has propagated through the first core. The signal light of a relatively long wavelength band among a plurality of wavelength bands separated by the wavelength demultiplexing means is caused to propagate through the second core, and is then multiplexed with the signal light of a relatively short wavelength band among the plurality of wavelength bands separated by the wavelength demultiplexing means, and the resultant multiplexed signal light is output.
    Type: Application
    Filed: December 19, 2019
    Publication date: February 10, 2022
    Applicant: NEC Corporation
    Inventors: Keiichi MATSUMOTO, Emmanuel LE TAILLANDIER DE GABORY, Shigeyuki YANAGIMACHI
  • Patent number: 11212027
    Abstract: This optical path setting device comprises: a transmission characteristic calculating means for calculating an inter-endpoint transmission characteristic that is a characteristic for transmission between endpoints of an optical path accommodating traffic in a plurality of optical communication systems; a required wavelength bandwidth determining means for determining a required wavelength bandwidth that is a wavelength bandwidth meeting an arrival performance of the optical path on the basis of the inter-endpoint transmission characteristic; and an accommodating wavelength band determining means for determining, as an accommodating wavelength band for accommodating the optical path, a common wavelength band that is a wavelength band where an optical path having the required wavelength bandwidth can be allocated, and that is common to the plurality of optical communication systems.
    Type: Grant
    Filed: November 29, 2018
    Date of Patent: December 28, 2021
    Assignee: NEC CORPORATION
    Inventors: Shinsuke Fujisawa, Hitoshi Takeshita, Shigeyuki Yanagimachi, Emmanuel Le Taillandier De Gabory
  • Publication number: 20210359485
    Abstract: There is the problem that, in a multicore optical fiber amplifier based on a clad excitation method, it is difficult to suppress the occurrence of an optical surge due to input of signal light into a core with no signal light, without the occurrence of fluctuation in the gain of a core into which signal light is inputted; therefore, a multicore optical fiber amplifier according to an exemplary aspect of the present invention includes a multicore optical fiber amplification medium including, in a clad, a plurality of cores doped with a rare earth element; signal light introduction means for introducing, into each of the plurality of cores, signal light with a wavelength included in a gain band of the multicore optical fiber amplification medium; excitation light introduction means for introducing, into the clad, excitation light for exciting the multicore optical fiber amplification medium; and control light introduction means for introducing control light into each of the plurality of cores, wherein the contr
    Type: Application
    Filed: January 19, 2018
    Publication date: November 18, 2021
    Applicant: NEC Corporation
    Inventors: Shigeru NAKAMURA, Emmanuel LE TAILLANDIER DE GABORY, Shigeyuki YANAGIMACHI
  • Patent number: 11115117
    Abstract: A submarine optical communication system control device (1) according to the present invention includes: a light intensity distribution determination device (2) configured to determine an optimum distribution of signal light intensity of each optical path for each allocated frequency; a light intensity distribution measuring device (3) configured to measure a light intensity distribution of an optical path after transmission through a submarine cable transmission line; an equalization setting calculation unit (4) configured to calculate a gain equalization setting for compensating for the difference between an optimum distribution in the light intensity distribution determination device and a measured distribution in the light intensity distribution measuring device; and a variable gain equalizer (5) configured to compensate for a light intensity distribution of an optical path to the optimum distribution, based on a gain equalization setting in the equalization setting calculation unit.
    Type: Grant
    Filed: March 27, 2018
    Date of Patent: September 7, 2021
    Assignee: NEC CORPORATION
    Inventors: Shinsuke Fujisawa, Hitoshi Takeshita, Shigeyuki Yanagimachi, Emmanuel Le Taillandier De Gabory
  • Publication number: 20210258205
    Abstract: In order to quickly estimate an abnormal transponder at low cost, a network monitoring device acquires, when sensing a failure occurrence channel, route information of the failure occurrence channel. The network monitoring device generates an adjacent channel table in which an adjacent channel being close in wavelength to the failure occurrence channel is extracted, then generates an interference channel table in which an interference channel sharing a common route with the failure occurrence channel among the adjacent channels is extracted, and then performs weighting on the interference channel, based on closeness of wavelength to the failure occurrence channel, and generates an influence channel table in which a weight is given to the interference channel. The network monitoring device estimates, based on the influence channel table, a channel with a large weight to be a channel having a possibility of exerting a negative influence on the failure occurrence channel.
    Type: Application
    Filed: February 11, 2021
    Publication date: August 19, 2021
    Applicant: NEC Corporation
    Inventor: Shigeyuki YANAGIMACHI
  • Publication number: 20210194218
    Abstract: It is necessary to reduce the power consumption of a plurality of optical amplifiers when there is a difference in the required pumping power between the plurality of optical amplifiers; therefore, an optical amplifying apparatus according to an exemplary aspect of the invention includes a plurality of optical amplifying means for amplifying a plurality of optical signals, each of the plurality of optical amplifying means including a gain medium; a plurality of laser light generating means for generating a plurality of laser beams; at least one optical coupling means for coupling the plurality of laser beams variably in accordance with a coupling factor and outputting a plurality of excitation light beams, each of the plurality of excitation light beams exciting the gain medium; and controlling means for controlling the coupling factor and an output power of each of the plurality of laser light generating means.
    Type: Application
    Filed: April 20, 2017
    Publication date: June 24, 2021
    Applicant: NEC CORPORATION
    Inventors: Emmanuel LE TAILLANDIER DE GABORY, Shigeyuki YANAGIMACHI, Shigeru NAKAMURA, Keiichi MATSUMOTO
  • Publication number: 20210013965
    Abstract: A submarine optical communication system control device (1) according to the present invention includes: a light intensity distribution determination device (2) configured to determine an optimum distribution of signal light intensity of each optical path for each allocated frequency; a light intensity distribution measuring device (3) configured to measure a light intensity distribution of an optical path after transmission through a submarine cable transmission line; an equalization setting calculation unit (4) configured to calculate a gain equalization setting for compensating for the difference between an optimum distribution in the light intensity distribution determination device and a measured distribution in the light intensity distribution measuring device; and a variable gain equalizer (5) configured to compensate for a light intensity distribution of an optical path to the optimum distribution, based on a gain equalization setting in the equalization setting calculation unit.
    Type: Application
    Filed: March 27, 2018
    Publication date: January 14, 2021
    Applicant: NEC CORPORATION
    Inventors: Shinsuke FUJISAWA, Hitoshi TAKESHITA, Shigeyuki YANAGIMACHI, Emmanuel LE TAILLANDIER DE GABORY
  • Publication number: 20200412079
    Abstract: Provided are a low-cost and low power-consumption optical fiber amplifier, an optical fiber amplifier control method, and a transmission system. The optical fiber amplifier comprises: an optical fiber to which pumping light is supplied and which amplifies an optical signal, the optical fiber including a plurality of cores in a cladding; a light source which outputs the pumping light; a combining means which supplies the pumping light from the light source to the cladding of the optical fiber and causes the pumping light to be combined with the optical signal; a collect means which collects, without collecting the signal light, pumping light among the supplied pumping light that has not been absorbed by the optical fiber; a monitor means which monitors residual pumping light that has passed through the optical fiber and collected by the collect means; and a control means which controls the state of the pumping light.
    Type: Application
    Filed: March 6, 2019
    Publication date: December 31, 2020
    Applicant: NEC Corporation
    Inventors: Keiichi MATSUMOTO, Emmanuel Le Taillandier DE GABORY, Shigeyuki YANAGIMACHI
  • Publication number: 20200374607
    Abstract: This optical path setting device comprises: a transmission characteristic calculating means for calculating an inter-endpoint transmission characteristic that is a characteristic for transmission between endpoints of an optical path accommodating traffic in a plurality of optical communication systems; a required wavelength bandwidth determining means for determining a required wavelength bandwidth that is a wavelength bandwidth meeting an arrival performance of the optical path on the basis of the inter-endpoint transmission characteristic; and an accommodating wavelength band determining means for determining, as an accommodating wavelength band for accommodating the optical path, a common wavelength band that is a wavelength band where an optical path having the required wavelength bandwidth can be allocated, and that is common to the plurality of optical communication systems.
    Type: Application
    Filed: November 29, 2018
    Publication date: November 26, 2020
    Applicant: NEC CORPORATION
    Inventors: Shinsuke FUJISAWA, Hitoshi TAKESHITA, Shigeyuki YANAGIMACHI, Emmanuel LE TAILLANDIER DE GABORY
  • Publication number: 20200045388
    Abstract: Provided are an optical communication device and an optical communication system capable of preventing the costs of equipment from increasing for an optical communication network constructed including devices provided by different vendors or devices of different generations.
    Type: Application
    Filed: March 30, 2018
    Publication date: February 6, 2020
    Applicants: National Institute of Advanced Industrial Science and Technology, NEC CORPORATION
    Inventors: Kiyo ISHII, Shu NAMIKI, Shigeyuki YANAGIMACHI, Hitoshi TAKESHITA, Akio TAJIMA
  • Publication number: 20190221987
    Abstract: To solve the problem that the power consumption of optical amplifiers is not optimized over the life time of an amplifier, the optical amplifier includes a gain medium for amplifying a plurality of optical channels, the gain medium including a plurality of cores through which the plurality of optical channels to propagate respectively and a cladding area surrounding the plurality of cores, a monitor that monitors the temperature of the optical amplifier and producing a monitoring result, a first light source that emits a first light beam to excite the cladding area, a second light source that emits a plurality of second light beams to excite each of the plurality of cores individually, and a controller that controls the first light source and the second light source based on the produced monitoring result.
    Type: Application
    Filed: September 20, 2016
    Publication date: July 18, 2019
    Applicant: NEC Corporation
    Inventors: Emmanuel LE TAILLANDIER DE GABORY, Shigeru NAKAMURA, Shigeyuki YANAGIMACHI, Keiichi MATSUMOTO
  • Patent number: 8352655
    Abstract: A packet communication device autonomously selects an appropriate operation mode according to a connection environment to an external device before a service of the device is started. When the device is connected to the external buses, connection interface units notify an external device discrimination unit of connection of the device. The external device discrimination unit issues a polling packet to the connected device, discriminates the connected external device on the basis of the response packet, and notifies an operation mode switching unit. The operation mode switching unit selects an operation mode conforming to a connection environment of the packet communication device to the external device and switches the operation mode of the device to the mode.
    Type: Grant
    Filed: January 14, 2008
    Date of Patent: January 8, 2013
    Assignee: NEC Corporation
    Inventors: Jun Suzuki, Youichi Hidaka, Junichi Higuchi, Shigeyuki Yanagimachi, Takashi Yoshikawa
  • Patent number: 8172467
    Abstract: An optical backplane connector with a board removable (being possible to insert and remove) therein in the direction perpendicular to the backplane plate surface is arranged on a backplane having optical transmission paths. The optical backplane connector accommodates a photoelectric conversion module in such a manner the incident and exit light are perpendicular to the backplane and a transparent board with a photoelectric conversion element mounted thereon is perpendicular to the board and parallel to the backplane. The conduction between the electric contacts of the photoelectric conversion module and the inner electric contacts of the optical backplane connector is held by mechanical contact. At the end portion of the optical transmission path on the backplane, an optical connector having a 45? mirror and guide pins is mounted. The positioning operation is achieved by fitting the guide pins of the optical connector with the guide holes of the photoelectric conversion module.
    Type: Grant
    Filed: April 21, 2006
    Date of Patent: May 8, 2012
    Assignee: NEC Corporation
    Inventors: Junichi Sasaki, Kazuhiko Kurata, Takashi Yoshikawa, Shigeyuki Yanagimachi