Patents by Inventor Tomoyuki Hino
Tomoyuki Hino 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).
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Publication number: 20210352386Abstract: It is difficult to improve the usage efficiency of an optical communication network due to the passband narrowing effect in a wavelength selection process in an optical communication network using a wavelength division multiplexing system; therefore, an optical network management apparatus according to an exemplary aspect of the present invention includes wavelength selection information generating means for generating wavelength selection information on a wavelength selection process through which an optical path accommodating an information signal goes, with respect to each optical path; and wavelength selection information notifying means for notifying an optical node device through which the optical path goes of the wavelength selection information.Type: ApplicationFiled: July 26, 2021Publication date: November 11, 2021Applicant: NEC CORPORATIONInventors: Hitoshi Takeshita, Shinsuke Fujisawa, Tomoyuki Hino, Akio Tajima
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Patent number: 11143528Abstract: An optical fiber sensor irradiates light pulses into an optical fiber cable and analyses backscattered light thereof. The optical fiber sensor comprises: a determination part that determines a timing at which measurement of an environmental change starts and a timing at which measurement of the environmental change ends, based on the backscattered light; and an occurrence region estimation part that estimates an occurrence region of the environmental change in a longitudinal direction of the optical fiber cable, based on the timing at which measurement of the environmental change starts; the timing at which measurement of the environmental change ends; and a pulse width of the light pulses.Type: GrantFiled: March 26, 2019Date of Patent: October 12, 2021Assignee: NEC CORPORATIONInventors: Tomoyuki Hino, Akihiro Tanaka
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Patent number: 11109123Abstract: It is difficult to improve the usage efficiency of an optical communication network due to the passband narrowing effect in a wavelength selection process in an optical communication network using a wavelength division multiplexing system; therefore, an optical network management apparatus according to an exemplary aspect of the present invention includes wavelength selection information generating means for generating wavelength selection information on a wavelength selection process through which an optical path accommodating an information signal goes, with respect to each optical path; and wavelength selection information notifying means for notifying an optical node device through which the optical path goes of the wavelength selection information.Type: GrantFiled: July 9, 2020Date of Patent: August 31, 2021Assignee: NEC CORPORATIONInventors: Hitoshi Takeshita, Shinsuke Fujisawa, Tomoyuki Hino, Akio Tajima
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Publication number: 20210241615Abstract: A traffic monitoring apparatus includes a distributed acoustic sensor (DAS) for acquiring waterfall data, wherein the waterfall data includes a generation position of a vibration on a roadway adjacent to the DAS, a generation time of the vibration and an amplitude of the vibration. The traffic monitoring apparatus further includes a processor connected to the DAS. The processor is configured to receive the waterfall data from the DAS. The processor is further configured to preprocess the waterfall data. The processor is further configured to separate the preprocessed waterfall data into a plurality of patches, wherein a size of each patch of the plurality of patches is determined based on a parameter of the roadway. The processor is further configured to process each of the plurality of patches to estimate at least one traffic flow property of the roadway.Type: ApplicationFiled: January 30, 2020Publication date: August 5, 2021Inventors: Chaitanya Prasad NARISETTY, Tomoyuki HINO, Akihiro TANAKA
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Publication number: 20210058157Abstract: In a multi-layer network, a control load in the upper layer network increases, and the usage efficiency and the reliability of the entire network decrease; therefore, a multi-layer network system according to an exemplary aspect of the present invention includes a first network manager configured to set a logical path in a first network layer; and a second network manager configured to set a physical path corresponding to the logical path, in a second network layer, wherein the second network manager includes a network information storage configured to store physical network information including physical route information and transmission characteristic information on the second network layer, and the first network manager sets the logical path based on the physical network information.Type: ApplicationFiled: November 6, 2020Publication date: February 25, 2021Applicant: NEC CorporationInventors: Hitoshi TAKESHITA, Shinsuke FUJISAWA, Tomoyuki HINO, Akio TAJIMA
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Publication number: 20210010836Abstract: An optical fiber sensor irradiates light pulses into an optical fiber cable and analyses backscattered light thereof. The optical fiber sensor comprises: a determination part that determines a timing at which measurement of an environmental change starts and a timing at which measurement of the environmental change ends, based on the backscattered light; and an occurrence region estimation part that estimates an occurrence region of the environmental change in a longitudinal direction of the optical fiber cable, based on the timing at which measurement of the environmental change starts; the timing at which measurement of the environmental change ends; and a pulse width of the light pulses.Type: ApplicationFiled: March 26, 2019Publication date: January 14, 2021Applicant: NEC CorporationInventors: Tomoyuki HINO, Akihiro TANAKA
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Patent number: 10848245Abstract: In a multi-layer network, a control load in the upper layer network increases, and the usage efficiency and the reliability of the entire network decrease; therefore, a multi-layer network system according to an exemplary aspect of the present invention includes a first network manager configured to set a logical path in a first network layer; and a second network manager configured to set a physical path corresponding to the logical path, in a second network layer, wherein the second network manager includes a network information storage configured to store physical network information including physical route information and transmission characteristic information on the second network layer, and the first network manager sets the logical path based on the physical network information.Type: GrantFiled: December 15, 2015Date of Patent: November 24, 2020Assignee: NEC CORPORATIONInventors: Hitoshi Takeshita, Shinsuke Fujisawa, Tomoyuki Hino, Akio Tajima
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Publication number: 20200344533Abstract: It is difficult to improve the usage efficiency of an optical communication network due to the passband narrowing effect in a wavelength selection process in an optical communication network using a wavelength division multiplexing system; therefore, an optical network management apparatus according to an exemplary aspect of the present invention includes wavelength selection information generating means for generating wavelength selection information on a wavelength selection process through which an optical path accommodating an information signal goes, with respect to each optical path; and wavelength selection information notifying means for notifying an optical node device through which the optical path goes of the wavelength selection information.Type: ApplicationFiled: July 9, 2020Publication date: October 29, 2020Applicant: NEC CORPORATIONInventors: Hitoshi TAKESHITA, Shinsuke FUJISAWA, Tomoyuki HINO, Akio TAJIMA
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Publication number: 20200313765Abstract: If wavelength defragmentation is performed during the operation of an optical network, an instantaneous interruption of a network arises; consequently, data are lost; therefore, an optical network control method according to an exemplary aspect of the present invention includes monitoring a data volume of a client signal to be transmitted using a plurality of optical subcarriers; and performing synchronously, depending on a variation in the data volume, an optical subcarrier changing process of changing an active optical subcarrier, of the plurality of optical subcarriers, to be used for transmitting the client signal, and a remapping process of remapping the client signal onto an active optical subcarrier after having been changed.Type: ApplicationFiled: June 17, 2020Publication date: October 1, 2020Applicant: NEC CorporationInventors: Tomoyuki HINO, Akio TAJIMA, Hitoshi TAKESHITA, Shinsuke FUJISAWA
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Patent number: 10750259Abstract: It is difficult to improve the usage efficiency of an optical communication network due to the passband narrowing effect in a wavelength selection process in an optical communication network using a wavelength division multiplexing system; therefore, an optical network management apparatus according to an exemplary aspect of the present invention includes wavelength selection information generating means for generating wavelength selection information on a wavelength selection process through which an optical path accommodating an information signal goes, with respect to each optical path; and wavelength selection information notifying means for notifying an optical node device through which the optical path goes of the wavelength selection information.Type: GrantFiled: June 18, 2019Date of Patent: August 18, 2020Assignee: NEC CORPORATIONInventors: Hitoshi Takeshita, Shinsuke Fujisawa, Tomoyuki Hino, Akio Tajima
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Patent number: 10715249Abstract: If wavelength defragmentation is performed during the operation of an optical network, an instantaneous interruption of a network arises; consequently, data are lost; therefore, an optical network control method according to an exemplary aspect of the present invention includes monitoring a data volume of a client signal to be transmitted using a plurality of optical subcarriers; and performing synchronously, depending on a variation in the data volume, an optical subcarrier changing process of changing an active optical subcarrier, of the plurality of optical subcarriers, to be used for transmitting the client signal, and a remapping process of remapping the client signal onto an active optical subcarrier after having been changed.Type: GrantFiled: March 18, 2016Date of Patent: July 14, 2020Assignee: NEC CORPORATIONInventors: Tomoyuki Hino, Akio Tajima, Hitoshi Takeshita, Shinsuke Fujisawa
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Patent number: 10542335Abstract: In the elastic optical network, there has been the problem that processing steps increase that are required to re-optimize client signals to be concentrated; therefore, an optical network controller according to an exemplary aspect of the present invention includes reallocation detection means for monitoring an operation status of at least one of an optical communication channel and an optical node device that constitute an optical network, and determining, based on the operation status, whether or not to reallocate a client signal accommodated in an optical path set in the optical network; design-candidate exclusion means for designating, as a design exclusion object, at least one of the optical communication channel and the optical node device that are associated with an optical path targeted for reallocation that accommodates the client signal that the reallocation detection means has determined to reallocate; optical path design means for determining an alternative route for the optical path targeted forType: GrantFiled: February 8, 2017Date of Patent: January 21, 2020Assignee: NEC CORPORATIONInventors: Shinsuke Fujisawa, Akio Tajima, Hitoshi Takeshita, Tomoyuki Hino
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Patent number: 10447419Abstract: In an optical network based on a dense wavelength division multiplexing system using a flexible frequency grid, it is difficult to improve the usage efficiency of an optical frequency band owing to the occurrence of fragmentation of the optical frequency band; therefore, an optical network controller according to an exemplary aspect of the present invention includes an optical frequency region setting means for dividing an optical frequency band used in an optical network based on a dense wavelength division multiplexing system using a flexible frequency grid, and setting a plurality of optical frequency regions; and an optical path setting means for setting optical paths having a common attribute in at least one of the plurality of optical frequency regions.Type: GrantFiled: April 15, 2015Date of Patent: October 15, 2019Assignee: NEC CORPORATIONInventors: Hitoshi Takeshita, Shinsuke Fujisawa, Tomoyuki Hino, Akio Tajima
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Publication number: 20190306597Abstract: It is difficult to improve the usage efficiency of an optical communication network due to the passband narrowing effect in a wavelength selection process in an optical communication network using a wavelength division multiplexing system; therefore, an optical network management apparatus according to an exemplary aspect of the present invention includes wavelength selection information generating means for generating wavelength selection information on a wavelength selection process through which an optical path accommodating an information signal goes, with respect to each optical path; and wavelength selection information notifying means for notifying an optical node device through which the optical path goes of the wavelength selection information.Type: ApplicationFiled: June 18, 2019Publication date: October 3, 2019Applicant: NEC CORPORATIONInventors: Hitoshi TAKESHITA, Shinsuke Fujisawa, Tomoyuki Hino, Akio Tajima
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Patent number: 10382135Abstract: In an optical network based on a dense wavelength division multiplexing system using a flexible frequency grid, it is difficult to improve the usage efficiency of an optical frequency band owing to the occurrence of fragmentation of the optical frequency band; therefore, an optical network controller according to an exemplary aspect of the present invention includes an optical frequency region setting means for setting a plurality of optical frequency regions in an optical frequency band used in an optical network based on a dense wavelength division multiplexing system using a flexible frequency grid; an optical path setting means for setting optical paths having a common attribute in at least one of the plurality of optical frequency regions; and an optical frequency region control means for changing an optical frequency width of the optical frequency region, and instructing the optical frequency region setting means to reconfigure, as the plurality of optical frequency regions, a plurality of optical frequType: GrantFiled: April 15, 2015Date of Patent: August 13, 2019Assignee: NEC CORPORATIONInventors: Hitoshi Takeshita, Shinsuke Fujisawa, Tomoyuki Hino, Akio Tajima
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Patent number: 10375460Abstract: It is difficult to improve the usage efficiency of an optical communication network due to the passband narrowing effect in a wavelength selection process in an optical communication network using a wavelength division multiplexing system; therefore, an optical network management apparatus according to an exemplary aspect of the present invention includes wavelength selection information generating means for generating wavelength selection information on a wavelength selection process through which an optical path accommodating an information signal goes, with respect to each optical path; and wavelength selection information notifying means for notifying an optical node device through which the optical path goes of the wavelength selection information.Type: GrantFiled: February 20, 2017Date of Patent: August 6, 2019Assignee: NEC CORPORATIONInventors: Hitoshi Takeshita, Shinsuke Fujisawa, Tomoyuki Hino, Akio Tajima
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Patent number: 10230487Abstract: It is made possible to accommodate a plurality of services and transmit each of the accommodated services to a corresponding transmission device. An optical transmitter according to an exemplary aspect of the present invention includes sub-carrier adjusting means for outputting sub-carriers to a plurality of output ports according to a control signal; encoding processing means for mapping client data on a plurality of output lanes according to the control signal; a plurality of modulation means for modulating the sub-carriers inputted through the output ports by client data inputted through the output lanes and outputting modulated signals; and control means for generating and outputting the control signal based on transmission information.Type: GrantFiled: March 11, 2015Date of Patent: March 12, 2019Assignee: NEC CORPORATIONInventors: Tomoyuki Hino, Shinsuke Fujisawa, Hitoshi Takeshita, Akio Tajima
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Patent number: 10231035Abstract: In an optical network by a highly dense wavelength division multiplexing system using a flexible frequency grid, it is difficult to improve the optical bandwidth utilization efficiency in the optical network as a whole with improving the fault tolerance, therefore, an optical network controller according to an exemplary aspect of the present invention includes an optical path setting means for selecting a plurality of optical node pairs composed of two optical nodes from among a plurality of optical nodes composing the optical network by a highly dense wavelength division multiplexing system using a flexible frequency grid, and setting, between each of the plurality of optical node pairs, a plurality of optical paths including a first optical path and a second optical path each of which links the optical node pair through various routes; and an optical band setting means for setting respective optical bands based on optical path length and transmission capacity so that an amount of optical bandwidths of the fType: GrantFiled: September 1, 2014Date of Patent: March 12, 2019Assignee: NEC CORPORATIONInventors: Hitoshi Takeshita, Tomoyuki Hino, Akio Tajima
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Patent number: 10211923Abstract: In an optical network system based on a wavelength division multiplexing system using a flexible frequency grid, with the diversification of optical modulation methods, the management burden on an optical network management device increases, and its control becomes complicated; therefore, an optical network system according to an exemplary aspect of the present invention includes an optical network management device configured to receive a traffic demand, design an optical path capable of accommodating the traffic demand, and create optical path design information of a design result; and an optical node device configured to be used for creating the optical path, wherein the optical node device calculates an allocable bandwidth from the optical path design information and optical node device information on a configuration of the optical node device, and the allocable bandwidth is an optical frequency bandwidth of a generable optical path that the optical node device is capable of generating, and the optical neType: GrantFiled: November 11, 2015Date of Patent: February 19, 2019Assignee: NEC CorporationInventors: Hitoshi Takeshita, Tomoyuki Hino, Shinsuke Fujisawa, Akio Tajima
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Publication number: 20190037288Abstract: In the elastic optical network, there has been the problem that processing steps increase that are required to re-optimize client signals to be concentrated; therefore, an optical network controller according to an exemplary aspect of the present invention includes reallocation detection means for monitoring an operation status of at least one of an optical communication channel and an optical node device that constitute an optical network, and determining, based on the operation status, whether or not to reallocate a client signal accommodated in an optical path set in the optical network; design-candidate exclusion means for designating, as a design exclusion object, at least one of the optical communication channel and the optical node device that are associated with an optical path targeted for reallocation that accommodates the client signal that the reallocation detection means has determined to reallocate; optical path design means for determining an alternative route for the optical path targeted forType: ApplicationFiled: February 8, 2017Publication date: January 31, 2019Applicant: NEC CORPORATIONInventors: Shinsuke FUJISAWA, Akio TAJIMA, Hitoshi TAKESHITA, Tomoyuki HINO