Patents by Inventor Mitsuhiro Teshima
Mitsuhiro Teshima 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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Patent number: 10200116Abstract: A multilane transmission device that transmits data frames by using a plurality of lanes, comprising: a data frame allocating unit that allocates data frames based on a transmission destination; a flow group information sequence information adding unit that adds flow group information indicating a flow group corresponding to a transmission source and transmission destinations and sequence information indicating a sequence of the data frames to the data frames allocated based on each transmission destination by the data frame allocating unit; and a lane selecting/outputting unit that transmits the data frames having the respective flow group information and the respective sequence information added thereto by the flow group information sequence information adding unit to the transmission destinations by using one or more lanes corresponding to the respective flow group information.Type: GrantFiled: May 17, 2016Date of Patent: February 5, 2019Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Kei Kitamura, Kenji Hisadome, Mitsuhiro Teshima, Yoshiaki Yamada, Osamu Ishida
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Patent number: 10193566Abstract: An object is to enable erasure correction even at the time of a degeneration operation and reduce the number of necessary parallel media through dynamic setting of degree of redundancy. A parallel data encoding/decoding system performs parallel data transmissions using a plurality of lanes from an encoder to a decoder. The encoder encodes products of elements of an encoding vector M of symbols of each lane and a state vector U indicating validity of the symbols, and transmits the state vector U along with a transmission vector Y obtained through the encoding. The decoder decodes a subset Msub constituted of valid elements of the encoding vector M using a received reception vector Y?, the received state vector U, and an erasure vector E indicating whether each element of the transmission vector has been erased in a transmission/reception section.Type: GrantFiled: September 6, 2013Date of Patent: January 29, 2019Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Yoshiaki Yamada, Mitsuhiro Teshima, Kei Kitamura, Kenji Hisadome
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Patent number: 10122462Abstract: A transport apparatus includes: a client signal transceiving unit which transceives a client signal; a line signal transceiving unit which performs electric-optic conversion on a line signal to be transmitted, transmits an optical line signal, performs optic-electric conversion on a received line signal, and outputs an electrical line signal; and a plurality of signal processing units which perform signal processing on the client signal to generate the line signal to be transmitted and perform signal processing on the electrical line signal to generate the client signal.Type: GrantFiled: November 19, 2014Date of Patent: November 6, 2018Assignee: Nippon Telegraph And Telephone CorporationInventors: Takuya Ohara, Kei Kitamura, Yoshiaki Kisaka, Shigeki Aisawa, Masahiro Suzuki, Etsushi Yamazaki, Tomoyoshi Kataoka, Masahito Tomizawa, Yoshiaki Yamada, Mitsuhiro Teshima, Akira Hirano
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Patent number: 9973270Abstract: It is an object to provide a technique capable of using a single framer as a necessary framer and causing the framer to be shared among a plurality of transmission destinations and priorities when coping with a plurality of transmission destinations or priorities and a change in a bandwidth of a physical lane that is caused by a change in a modulation scheme or a change in the number of wavelengths. A multilane transmission device that allocates client signals based on a transmission destination or a priority, decides the number of virtual lanes necessary for transmission of the client signals allocated based on each transmission destination or each priority, allocates the client signals allocated based on each transmission destination or each priority to the virtual lanes whose number has been decided, and frames the client signals allocated to the virtual lanes as transport frames, multiplexes the virtual lanes into a physical lane, and transmits the framed transport frames by using the physical lane.Type: GrantFiled: February 21, 2013Date of Patent: May 15, 2018Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Kei Kitamura, Kenji Hisadome, Mitsuhiro Teshima, Yoshiaki Yamada, Osamu Ishida
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Publication number: 20170111116Abstract: A transport apparatus includes: a client signal transceiving unit which transceives a client signal; a line signal transceiving unit which performs electric-optic conversion on a line signal to be transmitted, transmits an optical line signal, performs optic-electric conversion on a received line signal, and outputs an electrical line signal; and a plurality of signal processing units which perform signal processing on the client signal to generate the line signal to be transmitted and perform signal processing on the electrical line signal to generate the client signal.Type: ApplicationFiled: November 19, 2014Publication date: April 20, 2017Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Takuya OHARA, Kei KITAMURA, Yoshiaki KISAKA, Shigeki AISAWA, Masahiro SUZUKI, Etsushi YAMAZAKI, Tomoyoshi KATAOKA, Masahito TOMIZAWA, Yoshiaki YAMADA, Mitsuhiro TESHIMA, Akira HIRANO
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Publication number: 20160261339Abstract: A multilane transmission device that transmits data frames by using a plurality of lanes, comprising: a data frame allocating unit that allocates data frames based on a transmission destination; a flow group information sequence information adding unit that adds flow group information indicating a flow group corresponding to a transmission source and transmission destinations and sequence information indicating a sequence of the data frames to the data frames allocated based on each transmission destination by the data frame allocating unit; and a lane selecting/outputting unit that transmits the data frames having the respective flow group information and the respective sequence information added thereto by the flow group information sequence information adding unit to the transmission destinations by using one or more lanes corresponding to the respective flow group information.Type: ApplicationFiled: May 17, 2016Publication date: September 8, 2016Inventors: Kei KITAMURA, Kenji HISADOME, Mitsuhiro TESHIMA, Yoshiaki YAMADA, Osamu ISHIDA
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Publication number: 20160056886Abstract: It is an object to provide a technique capable of using a single framer as a necessary framer and causing the framer to be shared among a plurality of transmission destinations and priorities when coping with a plurality of transmission destinations or priorities and a change in a bandwidth of a physical lane that is caused by a change in a modulation scheme or a change in the number of wavelengths. A multilane transmission device that allocates client signals based on a transmission destination or a priority, decides the number of virtual lanes necessary for transmission of the client signals allocated based on each transmission destination or each priority, allocates the client signals allocated based on each transmission destination or each priority to the virtual lanes whose number has been decided, and frames the client signals allocated to the virtual lanes as transport frames, multiplexes the virtual lanes into a physical lane, and transmits the framed transport frames by using the physical lane.Type: ApplicationFiled: February 21, 2013Publication date: February 25, 2016Inventors: Kei Kitamura, Kenji Hisadome, Mitsuhiro Teshima, Yoshiaki Yamada, Osamu Ishida
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Publication number: 20150229329Abstract: An object is to enable erasure correction even at the time of a degeneration operation and reduce the number of necessary parallel media through dynamic setting of degree of redundancy. A parallel data encoding/decoding system performs parallel data transmissions using a plurality of lanes from an encoder to a decoder. The encoder encodes products of elements of an encoding vector M of symbols of each lane and a state vector U indicating validity of the symbols, and transmits the state vector U along with a transmission vector Y obtained through the encoding. The decoder decodes a subset Msub constituted of valid elements of the encoding vector M using a received reception vector Y?, the received state vector U, and an erasure vector E indicating whether each element of the transmission vector has been erased in a transmission/reception section.Type: ApplicationFiled: September 6, 2013Publication date: August 13, 2015Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Yoshiaki Yamada, Mitsuhiro Teshima, Kei Kitamura, Kenji Hisadome
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Patent number: 9054894Abstract: The present invention provides a signal block sequence processing method. According to the method, signal block headers (Bch, Bdh) are deleted from each sequence of signal blocks (B) each composed of the signal block header indicating whether a signal block payload is a control block payload (Bc?) containing a control code is contained or a data block payload (Bd?) containing data is contained. The resultant signal blocks are formed into one group (G). Each control block payload in the group is provided with position determination information indicating the position of the control block payload in the group. The signal block payloads are rearranged in accordance with a signal block payload rearrangement rule. The rearranged signal block payloads are contained in a super-block payload (Sc), to which a super-block header (Shc) indicative of containment of control block payloads is added. The resultant super-block (S) is output.Type: GrantFiled: July 4, 2008Date of Patent: June 9, 2015Assignee: Nippon Telegraph and Telephone CorporationInventors: Shoukei Kobayashi, Mitsuhiro Teshima, Takehito Yamamoto, Osamu Ishida, Yoshiaki Kisaka
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Publication number: 20110013690Abstract: The present invention provides a signal block sequence processing method. According to the method, signal block headers (Bch, Bdh) are deleted from each sequence of signal blocks (B) each composed of the signal block header indicating whether a signal block payload is a control block payload (Bc?) containing a control code is contained or a data block payload (Bd?) containing data is contained. The resultant signal blocks are formed into one group (G). Each control block payload in the group is provided with position determination information indicating the position of the control block payload in the group. The signal block payloads are rearranged in accordance with a signal block payload rearrangement rule. The rearranged signal block payloads are contained in a super-block payload (Sc), to which a super-block header (Shc) indicative of containment of control block payloads is added. The resultant super-block (S) is output.Type: ApplicationFiled: July 4, 2008Publication date: January 20, 2011Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Shoukei Kobayashi, Mitsuhiro Teshima, Takehito Yamanoto, Osamu Ishida, Yoshiaki Kisaka
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Patent number: 7555215Abstract: A dual structure for a multiplexing section extended to an OSU is obtained without adding a dynamic function, such as an optical switch, to a W-MULDEM. The W-MULDEM of an optical wavelength division multiplexing access system divides, among ports corresponding to the individual ONUs, downstream optical signals having wavelengths ?d1 to ?dn, which are received along a current-use optical fiber, or downstream optical signals having wavelengths ?d1+?? to ?dn+??, which are received along a redundant optical fiber. The W-MULDEM also multiplexes, for the port that corresponds to the current-use optical fiber or the redundant optical fiber, upstream optical signals having wavelengths ?u1 to ?un or wavelengths ?u1+?? to ?un+??, which are received along optical fibers corresponding to the ONUs. A wavelength difference between the downstream optical signal and the upstream optical signal that are consonant with each ONU is defined as an integer times the FSR of an AWG.Type: GrantFiled: May 28, 2004Date of Patent: June 30, 2009Assignee: Nippon Telegraph and Telephone CorporationInventors: Hirotaka Nakamura, Junichi Kani, Hiroo Suzuki, Mitsuhiro Teshima, Ukyo Yamaguchi, Hidetaka Onishi, Katsumi Iwatsuki
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Patent number: 7206510Abstract: A first optical fiber transmission path is used to transmit continuous-wave light for upstream signal light from the center node to each of the remote nodes, while a second optical fiber transmission path is used to transmit downstream signal light from the center node to each remote node and to transmit upstream signal light (obtained by modulating continuous-wave light) from each remote node to the center node. In this network, specific wavelength bandwidths are allocated to each remote node for the continuous-wave lights (for upstream signal lights) and the downstream signal lights, and the wavelength bandwidths for the continuous-wave lights (for upstream signal lights) and the downstream signal lights are alternately set.Type: GrantFiled: October 8, 2002Date of Patent: April 17, 2007Assignee: Nippon Telegraph and Telephone CorporationInventors: Hiroo Suzuki, Masamichi Fujiwara, Mitsuhiro Teshima, Koji Akimoto, Shingo Kawai, Jun-ichi Kani, Noboru Takachio, Katsumi Iwatsuki
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Patent number: 7155127Abstract: Cost-reduction in an optical communication unit is achieved by using spectrum-sliced modulated broadband light for transmitting upstream signals, instead of using laser light. An optical communication system includes at least one pair of optical communication units that each has a bi-directional network interface in which physical bit rates of transmission signals and reception signals are identical, an optical transmitter, and an optical receiver, and that performs bi-directional transmissions via at least one optical fiber. One optical communication unit includes a physical bit rate down-converter that lowers the physical bit rate of transmission signals from the bi-directional network interface and outputs to the optical transmitter, and the other optical communication unit includes a physical bit rate up-converter that raises the physical bit rate of signals received by the optical receiver and outputs to the bi-directional network interface.Type: GrantFiled: August 14, 2002Date of Patent: December 26, 2006Assignee: Nippon Telegraph and Telephone CorporationInventors: Koji Akimoto, Jun-ichi Kani, Mitsuhiro Teshima, Katsumi Iwatsuki, Masaki Fukui
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Patent number: 7127168Abstract: Multi-wavelength light having a frequency band equal to or greater than the FSR of an AWG is demultiplexed into individual wavelength channels, and power level deviations between wavelength channels are suppressed. An optical demultiplexer includes a wavelength-group demultiplexer that demultiplexes multi-wavelength light into wavelength groups formed from wavelength channels, and channel demultiplexers that demultiplex each wavelength group into wavelength channels light. An optical multiplexer includes channel multiplexers that multiplex modulated signal light of each wavelength channel for each wavelength group, and a wavelength-group multiplexer that multiplexes, for each wavelength group, WDM signal light output from the channel multiplexers. The FSR of the wavelength-group multiplexer/demultiplexer is set to be equal to or greater than the frequency band of the multi-wavelength light.Type: GrantFiled: June 5, 2002Date of Patent: October 24, 2006Assignee: Nippon Telegraph and Telephone CorporationInventors: Jun-ichi Kani, Katsuhiro Araya, Noboru Takachio, Koji Akimoto, Mitsuhiro Teshima, Masamichi Fujiwara, Hiroo Suzuki, Shingo Kawai, Katsumi Iwatsuki
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Patent number: 7106970Abstract: To generate light with the degree of polarization zeroed and the spread of an optical spectrum suppressed even with temporal overlapping between optical pulses each of which is polarized orthogonally to the succeeding pulse, a polarization scrambler includes an optical pulse generator that generates optical pulses with an intensity waveform repetition period T/2 and an electrical field repetition period T in which the same intensity waveform is repeated every repetition period T/2 and in which phase is inverted every repetition period T/2, and an orthogonal polarization delay unit which receives each of the optical pulses, separates the optical pulse into two optical pulses with orthogonal states of polarization, and relatively shifts the temporal position of one of the two optical pulses from that of the other optical pulse by (2n?1)T/4 (n is a natural number) to generate light in which each pulse is polarized orthogonally to a succeeding pulse.Type: GrantFiled: May 20, 2005Date of Patent: September 12, 2006Assignee: Nippon Telegraph and Telephone CorporationInventors: Masamichi Fujiwara, Mitsuhiro Teshima, Noboru Takachio, Katsumi Iwatsuki
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Patent number: 7076166Abstract: This invention discloses an optical burst transmission system in which an optical generator generates Type 1 lightwaves having different wavelengths corresponding to transmission lines and having undergone intensity modulation with obtained data; a broad spectrum optical generator generates, by incorporating Type 2 lightwaves, a Type 3 lightwave using a fewer light emitting devices than the number of the Type 1 lightwaves, each Type 2 lightwaves having a corresponding wavelength apart from Type 1 lightwave's wavelength with an FSR interval and having undergone the intensity modulation with clock signals; an optical multiplexer multiplexes the Type 1 and Type 3 lightwaves to output the combination to each transmission line; and an optical routing unit extracts, from the combination, pairs of one Type 1 lightwave and one Type 2 lightwave having the corresponding wavelength, and guides pairs to each transmission line corresponding to the Type 1 lightwave's wavelength in each pair.Type: GrantFiled: August 5, 2002Date of Patent: July 11, 2006Assignees: Matsushita Electric Industrial Co., Ltd., Nippon Telegraph and Telephone CorporationInventors: Masaru Fuse, Toru Shiozaki, Yoshikazu Ishii, Hiroaki Asano, Kuniaki Utsumi, Katsumi Iwatsuki, Hitoshi Uematsu, Shigeru Kuwano, Mitsuhiro Teshima
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Patent number: 7068412Abstract: With respect to the relative intensity noise (RIN) for inputs to an optical modulator or the signal-to-noise ratio (SNR) for outputs therefrom, the optical modulator modulating coherent lights of different wavelengths obtained by slicing a spectrum of the multi-wavelength light, the shape of a spectrum of a multi-wavelength light is controlled so that predetermined RIN and SNR can be obtained in accordance with transmission system parameters (the type and distance of optical fibers, the number of repeaters), thus enabling design meeting a performance specification for a conventional transmission section using semiconductor lasers.Type: GrantFiled: April 16, 2004Date of Patent: June 27, 2006Assignee: Nippon Telegraph and Telephone Corp.Inventors: Masamichi Fujiwara, Katsuhiro Araya, Mitsuhiro Teshima, Junichi Kani, Kenichi Suzuki
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Patent number: 7031614Abstract: To generate light with the degree of polarization zeroed and the spread of an optical spectrum suppressed even with temporal overlapping between optical pulses each of which is polarized orthogonally to the succeeding pulse, a polarization scrambler includes an optical pulse generator that generates optical pulses with an intensity waveform repetition T/2 and an electrical field repetition period T in which the same intensity waveform is repeated every repetition period T/2 and in which phase is inverted every repetition period T/2, and an orthogonal polarization delay unit which receives each of the optical pulses, separates the optical pulse into two optical pulses with orthogonal states of polarization, and relatively shifts the temporal position of one of the two optical pulses from that of the other optical pulse by (2n?1)T/4 (n is a natural number) to generate light in which each pulse is polarized orthogonally to a succeeding pulse.Type: GrantFiled: May 19, 2005Date of Patent: April 18, 2006Assignee: Nippon Telegraph and Telephone CorporationInventors: Masamichi Fujiwara, Mitsuhiro Teshima, Noboru Takachio, Katsumi Iwatsuki
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Publication number: 20060062576Abstract: A dual structure for a multiplexing section extended to an OSU is obtained without adding a dynamic function, such as an optical switch, to a W-MULDEM. The W-MULDEM of an optical wavelength division multiplexing access system divides, among ports corresponding to the individual ONUs, downstream optical signals having wavelengths ?d1 to ?dn, which are received along a current-use optical fiber, or downstream optical signals having wavelengths ?d1+?? to ?dn+??, which are received along a redundant optical fiber. The W-MULDEM also multiplexes, for the port that corresponds to the current-use optical fiber or the redundant optical fiber, upstream optical signals having wavelengths ?u1 to ?un or wavelengths ?u1+?? to ?un+??, which are received along optical fibers corresponding to the ONUs. A wavelength difference between the downstream optical signal and the upstream optical signal that are consonant with each ONU is defined as an integer times the FSR of an AWG.Type: ApplicationFiled: May 28, 2004Publication date: March 23, 2006Inventors: Hirotaka Nakamura, Junichi Kani, Hiroo Suzuki, Mitsuhiro Teshima, Ukyo Yamaguchi, Hidetaka Onishi, Katsumi Iwatsuki
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Patent number: 6959152Abstract: To generate light with the degree of polarization zeroed and the spread of an optical spectrum suppressed even with temporal overlapping between optical pulses each of which is polarized orthogonally to the succeeding pulse, a polarization scrambler includes an optical pulse generator that generates optical pulses with an intensity waveform repetition period T/2 and an electrical field repetition period T in which the same intensity waveform is repeated every repetition period T/2 and in which phase is inverted every repetition period T/2, and an orthogonal polarization delay unit which receives each of the optical pulses, separates the optical pulse into two optical pulses with orthogonal states of polarization, and relatively shifts the temporal position of one of the two optical pulses from that of the other optical pulse by (2n?1)T/4 (n is a natural number) to generate light in which each pulse is polarized orthogonally to a succeeding pulse.Type: GrantFiled: February 20, 2003Date of Patent: October 25, 2005Assignee: Nippon Telegraph and Telephone CorporationInventors: Masamichi Fujiwara, Mitsuhiro Teshima, Noboru Takachio, Katsumi Iwatsuki