Patents by Inventor Kyosuke Sone

Kyosuke Sone 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: 20220303038
    Abstract: A transmission device including: a signal power detection circuit that detects signal power of a wavelength-division-multiplexed optical signal to be transmitted to a transmission line into which pumping light is inputted from a Raman amplifier; a variable optical attenuator that attenuates the wavelength-division-multiplexed optical signal; and a control circuit that reduces an attenuation amount of the variable optical attenuator depending on an increase in the signal power.
    Type: Application
    Filed: December 8, 2021
    Publication date: September 22, 2022
    Applicant: FUJITSU LIMITED
    Inventors: XIANG ZHANG, Kyosuke Sone, Tatsuya Tsuzuki
  • Patent number: 10797799
    Abstract: An optical transmission apparatus includes a wavelength variable filter whose transmission light wavelength is variable; a receiver that receives light, the light being sent from another optical transmission apparatus and passing through the wavelength variable filter; a transmitter that sends to the another optical transmission apparatus, a utilization permission request for a second wavelength corresponding to a first wavelength of the light received by the receiver, the transmitter sending the utilization permission request as light of the second wavelength and in a form of a tone signal of a predetermined frequency; and a controller that, when receiving from the another optical transmission apparatus, a utilization permission notification of the second wavelength for a sender of the utilization permission request, configures a wavelength of a main signal to the second wavelength, the main signal being sent from the transmitter to the another optical transmission apparatus.
    Type: Grant
    Filed: October 25, 2018
    Date of Patent: October 6, 2020
    Assignee: FUJITSU LIMITED
    Inventors: Goji Nakagawa, Kyosuke Sone, Yoshio Hirose, Takeshi Hoshida, Setsuo Yoshida
  • Patent number: 10763986
    Abstract: A transmission device includes an interface configured to acquire, from a base band unit having a communication destination that is one of remote radio heads, communication destination information relating to the remote radio head of the communication destination, a receiver configured to receive signals of given wavelength from optical termination devices, and a transmitter configured to transmit a first signal that includes wavelength information indicative of the given wavelength and the communication destination information to optical termination devices, wherein, when the receiver receives, from an optical termination device of the remote radio head of the communication destination from among optical termination devices, a second signal of the given wavelength according to the first signal, the receiver sets, between the receiver and the optical termination device, a relay path that relays communication between the base band unit and the remote radio head of the communication destination.
    Type: Grant
    Filed: August 6, 2019
    Date of Patent: September 1, 2020
    Assignee: FUJITSU LIMITED
    Inventors: Kyosuke Sone, Goji Nakagawa, Yoshio Hirose
  • Patent number: 10567082
    Abstract: An optical terminal device includes: a relay processing circuitry relaying communication between first base stations, respectively connected to optical terminating devices at branch destinations of a transmission path, and a control device controlling the first base stations in accordance with information acquired from a second base station covering a cell overlapping cells of the first base stations; a detecting circuitry detecting a sleep control instruction, issued for one of the first base stations from the control device, from the communication being relayed by the relay processing circuitry; and a control circuitry performing control, via the transmission path, to cause the optical terminating device connected to the one of the first base stations to shift to an operating state or a sleep state, which consumes less power than the operating state, in response to detection of the sleep control instruction, the optical terminating device being one of the optical terminating devices.
    Type: Grant
    Filed: May 9, 2018
    Date of Patent: February 18, 2020
    Assignee: FUJITSU LIMITED
    Inventors: Kyosuke Sone, Goji Nakagawa, Yoshio Hirose
  • Publication number: 20200052807
    Abstract: A transmission device includes an interface configured to acquire, from a base band unit having a communication destination that is one of remote radio heads, communication destination information relating to the remote radio head of the communication destination, a receiver configured to receive signals of given wavelength from optical termination devices, and a transmitter configured to transmit a first signal that includes wavelength information indicative of the given wavelength and the communication destination information to optical termination devices, wherein, when the receiver receives, from an optical termination device of the remote radio head of the communication destination from among optical termination devices, a second signal of the given wavelength according to the first signal, the receiver sets, between the receiver and the optical termination device, a relay path that relays communication between the base band unit and the remote radio head of the communication destination.
    Type: Application
    Filed: August 6, 2019
    Publication date: February 13, 2020
    Applicant: FUJITSU LIMITED
    Inventors: Kyosuke Sone, GOJI NAKAGAWA, Yoshio Hirose
  • Publication number: 20190165865
    Abstract: An optical transmission apparatus includes a wavelength variable filter whose transmission light wavelength is variable; a receiver that receives light, the light being sent from another optical transmission apparatus and passing through the wavelength variable filter; a transmitter that sends to the another optical transmission apparatus, a utilization permission request for a second wavelength corresponding to a first wavelength of the light received by the receiver, the transmitter sending the utilization permission request as light of the second wavelength and in a form of a tone signal of a predetermined frequency; and a controller that, when receiving from the another optical transmission apparatus, a utilization permission notification of the second wavelength for a sender of the utilization permission request, configures a wavelength of a main signal to the second wavelength, the main signal being sent from the transmitter to the another optical transmission apparatus.
    Type: Application
    Filed: October 25, 2018
    Publication date: May 30, 2019
    Applicant: FUJITSU LIMITED
    Inventors: GOJI NAKAGAWA, Kyosuke Sone, Yoshio Hirose, Takeshi Hoshida, Setsuo Yoshida
  • Patent number: 10261350
    Abstract: An optical transmitting apparatus includes a variable optical attenuator of a magneto-optical effect type disposed by spatial coupling between a light source and an optical fiber, the variable optical attenuator configured to attenuate light output from the light source and coupled to the optical fiber, according to an input driving voltage; a generator configured to generate the driving voltage of the variable optical attenuator based on information to be superimposed on the light by the variable optical attenuator, the generator inputting the generated driving voltage into the variable optical attenuator; and a controller configured to control a bias of the driving voltage generated by the generator, the controller controlling an amplitude of the driving voltage generated by the generator, based on data according to characteristics between the driving voltage and an attenuation amount of the light by the variable optical attenuator.
    Type: Grant
    Filed: November 6, 2017
    Date of Patent: April 16, 2019
    Assignee: FUJITSU LIMITED
    Inventors: Goji Nakagawa, Yoshio Hirose, Kyosuke Sone
  • Patent number: 10230463
    Abstract: A transmitter generates a frequency-modulated CW light so as to transmit it to a path. A receiver receives the CW light that has passed through passband filters included in the path. The receiver includes a processor. The processor measures an optical power of the received CW light every time a center frequency of the CW light is changed and transmitted by the transmitter. The processor calculates transmission characteristics of the CW light that has passed through the passband filters, on the basis of an average value of the optical power that corresponds to a center frequency of the CW light and on the basis of an amplitude component that indicates an amount of change in the optical power, the average value and the amplitude component being obtained as a result of the measurement.
    Type: Grant
    Filed: August 3, 2016
    Date of Patent: March 12, 2019
    Assignee: FUJITSU LIMITED
    Inventors: Guoxiu Huang, Yasuhiko Aoki, Shoichiro Oda, Zhenning Tao, Setsuo Yoshida, Kyosuke Sone
  • Patent number: 10200132
    Abstract: An optical communication system includes an optical transmitter, a plurality of optical receivers, and a splitter that splits light transmitted by the optical transmitter to the plurality of optical receivers. The optical transmitter includes a variable-wavelength light source capable of transmitting light of a first wavelength and light of a third wavelength between the first wavelength and a second wavelength. A first optical receiver of the plurality of optical receivers includes a first optical filter having a first transmission band including the first and third wavelengths, and a first receiving unit that receives light having passed through the first optical filter. A second optical receiver of the plurality of optical receivers includes a second optical filter having a second transmission band including the second and third wavelengths, and a second receiving unit that receives light having passed through the second optical filter.
    Type: Grant
    Filed: February 28, 2017
    Date of Patent: February 5, 2019
    Assignee: FUJITSU LIMITED
    Inventors: Kyosuke Sone, Yasuhiko Aoki, Goji Nakagawa
  • Patent number: 10187172
    Abstract: A processor of an optical transport apparatus is configured to transport an optical multiplexed signal between the optical transport apparatus and a counterpart apparatus by using a plurality of communication units; transmit an arbitrary optical wavelength from the optical multiplexed signal passing through ports by using a wavelength selective switch that has the ports respectively connected to the communication units; control a radio unit in the counterpart apparatus so as to change a frequency of the radio signal in the specified optical wavelength; and change a transmission band of the port through which the optical wavelength passes, according to a change of the frequency of the radio signal. The processor is configured to control an optical transmission unit of the counterpart apparatus so as to change a center wavelength of an optical wavelength passing through the port to a center wavelength of the changed transmission band of the port.
    Type: Grant
    Filed: February 13, 2017
    Date of Patent: January 22, 2019
    Assignee: FUJITSU LIMITED
    Inventors: Goji Nakagawa, Yasuhiko Aoki, Kyosuke Sone
  • Publication number: 20180359032
    Abstract: An optical terminal device includes: a relay processing circuitry relaying communication between first base stations, respectively connected to optical terminating devices at branch destinations of a transmission path, and a control device controlling the first base stations in accordance with information acquired from a second base station covering a cell overlapping cells of the first base stations; a detecting circuitry detecting a sleep control instruction, issued for one of the first base stations from the control device, from the communication being relayed by the relay processing circuitry; and a control circuitry performing control, via the transmission path, to cause the optical terminating device connected to the one of the first base stations to shift to an operating state or a sleep state, which consumes less power than the operating state, in response to detection of the sleep control instruction, the optical terminating device being one of the optical terminating devices.
    Type: Application
    Filed: May 9, 2018
    Publication date: December 13, 2018
    Applicant: FUJITSU LIMITED
    Inventors: Kyosuke SONE, GOJI NAKAGAWA, Yoshio Hirose
  • Publication number: 20180180909
    Abstract: An optical transmitting apparatus includes a variable optical attenuator of a magneto-optical effect type disposed by spatial coupling between a light source and an optical fiber, the variable optical attenuator configured to attenuate light output from the light source and coupled to the optical fiber, according to an input driving voltage; a generator configured to generate the driving voltage of the variable optical attenuator based on information to be superimposed on the light by the variable optical attenuator, the generator inputting the generated driving voltage into the variable optical attenuator; and a controller configured to control a bias of the driving voltage generated by the generator, the controller controlling an amplitude of the driving voltage generated by the generator, based on data according to characteristics between the driving voltage and an attenuation amount of the light by the variable optical attenuator.
    Type: Application
    Filed: November 6, 2017
    Publication date: June 28, 2018
    Applicant: FUJITSU LIMITED
    Inventors: Goji NAKAGAWA, Yoshio HIROSE, Kyosuke SONE
  • Patent number: 9847837
    Abstract: An optical line termination includes a detection circuit configured to detect a sleep request from a control apparatus to base stations; a determination circuit configured to determine, when the detection circuit detects the sleep request, whether processing of turning the base stations of requestees by the sleep request into a sleep state in accordance with the sleep request is approvable or not, based on a shortage bandwidth within a passive optical network in a different one of the base stations having a predetermined relationship with the requested base station; and a control circuit configured to discard the sleep request when the determination circuit determines that the processing is not approvable, or transfer the sleep request to the base station of the different requestee when the determination circuit determines that the processing is approval.
    Type: Grant
    Filed: December 2, 2016
    Date of Patent: December 19, 2017
    Assignee: FUJITSU LIMITED
    Inventors: Kyosuke Sone, Yasuhiko Aoki
  • Patent number: 9838148
    Abstract: An optical receiver includes: a tunable filter configured to partially transmit a wavelength-multiplexed optical-signal including a first optical-signal having a first wavelength, a second optical-signal having a second wavelength, and a third optical-signal having a third wavelength, with a frequency-modulated signal superimposed on each of the first to third optical-signals; a photo detector configured to detect an optical-power of the wavelength-multiplexed optical-signal transmitted through the tunable filter; and a superimposed signal detector configured to detect the frequency-modulated signal superimposed on the first optical-signal, based on an amplitude-modulated signal according to a variation in the optical-power on a first filter setting where both of the first optical-signal and the second optical-signal transmit through the tunable filter, and an amplitude-modulated signal according to a variation in the optical-power on a second filter setting where both of the first optical-signal and the thir
    Type: Grant
    Filed: April 11, 2016
    Date of Patent: December 5, 2017
    Assignee: FUJITSU LIMITED
    Inventors: Goji Nakagawa, Tomohiro Yamauchi, Guoxiu Huang, Setsuo Yoshida, Shoichiro Oda, Kyosuke Sone, Yasuhiko Aoki
  • Publication number: 20170279556
    Abstract: A processor of an optical transport apparatus is configured to transport an optical multiplexed signal between the optical transport apparatus and a counterpart apparatus by using a plurality of communication units; transmit an arbitrary optical wavelength from the optical multiplexed signal passing through ports by using a wavelength selective switch that has the ports respectively connected to the communication units; control a radio unit in the counterpart apparatus so as to change a frequency of the radio signal in the specified optical wavelength; and change a transmission band of the port through which the optical wavelength passes, according to a change of the frequency of the radio signal. The processor is configured to control an optical transmission unit of the counterpart apparatus so as to change a center wavelength of an optical wavelength passing through the port to a center wavelength of the changed transmission band of the port.
    Type: Application
    Filed: February 13, 2017
    Publication date: September 28, 2017
    Applicant: FUJITSU LIMITED
    Inventors: Goji NAKAGAWA, Yasuhiko AOKI, Kyosuke SONE
  • Publication number: 20170279538
    Abstract: An optical communication system includes an optical transmitter, a plurality of optical receivers, and a splitter that splits light transmitted by the optical transmitter to the plurality of optical receivers. The optical transmitter includes a variable-wavelength light source capable of transmitting light of a first wavelength and light of a third wavelength between the first wavelength and a second wavelength. A first optical receiver of the plurality of optical receivers includes a first optical filter having a first transmission band including the first and third wavelengths, and a first receiving unit that receives light having passed through the first optical filter. A second optical receiver of the plurality of optical receivers includes a second optical filter having a second transmission band including the second and third wavelengths, and a second receiving unit that receives light having passed through the second optical filter.
    Type: Application
    Filed: February 28, 2017
    Publication date: September 28, 2017
    Applicant: FUJITSU LIMITED
    Inventors: Kyosuke Sone, Yasuhiko Aoki, GOJI NAKAGAWA
  • Patent number: 9705629
    Abstract: A transmitting device coupled to a first route and a second route as communication paths on a first ring network and coupled to a third route as a communication path on a second ring network, the transmitting device includes: a first branching unit configured to branch and output signal light input from the first route to a first terminating unit and a second output unit that outputs signal light to the second route; a second branching unit configured to branch and output signal light input from the second route to a second terminating unit, a first output unit that outputs signal light to the first route, and a third output unit that outputs signal light to the third route; and a third branching unit configured to branch and output signal light input from the third route to a third terminating unit that terminates signal light and the second output unit.
    Type: Grant
    Filed: February 1, 2016
    Date of Patent: July 11, 2017
    Assignee: FUJITSU LIMITED
    Inventors: Kyosuke Sone, Yasuhiko Aoki
  • Patent number: 9705604
    Abstract: A communication device that receives received signal light from another communication device, the communication device includes: a receiver configured to receive signal light output from an optical filter that outputs signal light of a given wavelength included the received signal light; and a transmitter configured to transmit, to the another communication device, a control signal for controlling a wavelength of laser light for use in generation of the signal light of the given wavelength, wherein the receiver is configured to detect power of the signal light output from the optical filter; and the transmitter is configured to set, when the signal light is not successfully received in the receiver, the control signal so as to cause the another communication device to control the wavelength of the laser light, based on the power.
    Type: Grant
    Filed: March 25, 2016
    Date of Patent: July 11, 2017
    Assignee: Fujitsu Limited
    Inventors: Kyosuke Sone, Setsuo Yoshida, Goji Nakagawa, Shoichiro Oda, Yasuhiko Aoki
  • Patent number: 9698929
    Abstract: An optical receiver receives a wavelength multiplexed optical signal including wavelength channels. A superimposition signal is superimposed by frequency modulation on each of the wavelength channels. The optical receiver includes: an optical filter that filters the wavelength multiplexed optical signal; a filter controller that controls a wavelength of a transmission band of the optical filter; a photo detector that generates an intensity signal representing a change in the intensity of an output light of the optical filter; an signal detector that detects, according to the intensity signal, a superimposition signal superimposed on a specified wavelength channel. The filter controller controls the wavelength of the transmission band so that the amplitude of the intensity signal is larger, and then controls the wavelength of the transmission band so that the number of errors in the superimposition signal detected by the signal detector is reduced.
    Type: Grant
    Filed: February 24, 2016
    Date of Patent: July 4, 2017
    Assignee: FUJITSU LIMITED
    Inventors: Setsuo Yoshida, Goji Nakagawa, Tomohiro Yamauchi, Kyosuke Sone
  • Publication number: 20170187459
    Abstract: An optical line termination includes a detection circuit configured to detect a sleep request from a control apparatus to base stations; a determination circuit configured to determine, when the detection circuit detects the sleep request, whether processing of turning the base stations of requestees by the sleep request into a sleep state in accordance with the sleep request is approvable or not, based on a shortage bandwidth within a passive optical network in a different one of the base stations having a predetermined relationship with the requested base station; and a control circuit configured to discard the sleep request when the determination circuit determines that the processing is not approvable, or transfer the sleep request to the base station of the different requestee when the determination circuit determines that the processing is approval.
    Type: Application
    Filed: December 2, 2016
    Publication date: June 29, 2017
    Applicant: FUJITSU LIMITED
    Inventors: Kyosuke SONE, Yasuhiko Aoki