Patents by Inventor Manabu Oguma
Manabu Oguma 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: 20240157931Abstract: A travel control device for a hybrid vehicle includes: an acceleration control part for controlling a traveling motor generator or an engine based on a depression amount of an accelerator pedal, and a regenerative control part for controlling the traveling motor generator with a regenerative control intensity set by an operation part. The acceleration control part includes: an EV priority control portion for prioritizing EV traveling over engine traveling. The regenerative control part includes: a restriction portion for restricting or prohibiting regenerative braking; and a forced regeneration portion for performing regenerative braking on a driving wheel and rotationally driving a power generation motor generator by electricity generated in the traveling motor generator to rotationally drive an engine, if the regenerative braking intensity is increased by the operation part in a state where the restriction portion restricts or prohibits the regenerative braking.Type: ApplicationFiled: October 8, 2021Publication date: May 16, 2024Applicant: MITSUBISHI JIDOSHA KOGYO KABUSHIKI KAISHAInventors: Manabu HASEGAWA, Takahiro OGUMA
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Patent number: 11982837Abstract: An object is to improve crosstalk between ports while keeping an interposer circuit small. In an interposer circuit that includes a first surface connected to an optical circuit, a second surface that is connected to a fiber block and is located opposite to the first surface in parallel with the first surface, and a plurality of connection waveguides connected to a plurality of input/output waveguides included in the optical circuit and a plurality of input/output fibers included in the fiber block, the connection waveguides each have a straight shape, and an angle (?) formed between the first surface and each of the connection waveguides is the same as an angle (?) formed between the second surface and each of the connection waveguides.Type: GrantFiled: January 24, 2020Date of Patent: May 14, 2024Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Yuichiro Ikuma, Yusuke Nasu, Manabu Oguma, Takashi Yamada
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Patent number: 11982839Abstract: To provide an optical 90-degree hybrid formed of a silicon waveguide capable of suppressing an optical loss and a phase error, and facilitating electronic packaging and optical packaging. In the optical 90-degree hybrid circuit including two optical branching units facing each other and two optical coupling units facing away from each other, four arm waveguides are arranged including bent waveguides each of which guides an output light of the optical branching unit to the optical coupling unit, and is formed in a curved shape.Type: GrantFiled: April 16, 2020Date of Patent: May 14, 2024Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Makoto Jizodo, Manabu Oguma, Yusuke Nasu, Yuichiro Ikuma
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Patent number: 11973535Abstract: A wavelength monitoring circuit obtains a light output proportional to only an input optical signal, independent of wavelength, by adding a light split circuit to the configuration in the related art, or changing the light split circuit to a light trifurcation circuit. In addition, wavelength monitoring with high accuracy is possible while improving the resistance to noise. The extraction of the light output proportional to only the input optical signal is performed by a light split circuit for input light at the top stage of the wavelength monitoring circuit or a light split circuit for interference in a stage in the middle of the circuit. The changed light split circuit causes the MZI included in the wavelength monitoring circuit to operate in a state of losing the balance of the configuration or the optical signal level, and increases the signal level near the bottom portion of the transmission characteristics.Type: GrantFiled: January 17, 2020Date of Patent: April 30, 2024Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Osamu Moriwaki, Manabu Oguma, Kenya Suzuki, Takashi Go, Yuichiro Ikuma
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Patent number: 11835761Abstract: The invention provides a planar optical waveguide circuit capable of preventing part of the input signal light that has not been combined in the waveguide and propagates as leaked light from interfering with the output signal. A planar optical waveguide circuit having an optical waveguide embedded in a cladding layer includes: a plurality of parallel output optical waveguides configured to emit light from a same end face; a groove having a reflective interface formed at an angle of +45 degrees relative to the output optical waveguides and configured to reflect leaked light propagating in the cladding layer; and a groove having a reflective interface formed at an angle of ?45 degrees, the reflective interface formed at an angle of +45 degrees, the output optical waveguide, and the reflective interface formed at ?45 degrees being arranged repeatedly in that order.Type: GrantFiled: January 8, 2020Date of Patent: December 5, 2023Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Osamu Moriwaki, Kenya Suzuki, Takashi Go, Manabu Oguma, Yuichiro Ikuma
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Publication number: 20230341768Abstract: An optical device manufacturing method and an optical device manufacturing apparatus using local etching are characterized in that in a wafer process of manufacturing a waveguide type optical device including a light-propagating core and a cladding, a nozzle which locally performs etching processing is used for movement, and a slanted end surface at an arbitrary angle, an end surface having a curved shape, or a core having a varying film thickness is formed in an arbitrary position on the wafer. A slanted end surface is formed at an optical waveguide end using local etching, for example, a 45° reflective mirror, a light-condensing nonplanar reflective mirror, or a film thickness controlled core is implemented, and high-efficiency optical connection is realized.Type: ApplicationFiled: February 2, 2021Publication date: October 26, 2023Inventors: Yoshinori Hibino, Mikihiro Kurosawa, Manabu Oguma, Masahiro Yanagisawa, Tomoyuki Yamada
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Patent number: 11656405Abstract: Provided is an optical wavelength multi/demultiplexing circuit with a high rectangular transmission loss spectrum that is able to secure loss flatness of a transmission band, maintain/reduce a guard bandwidth of wavelength channel spacing, and broaden a transmission bandwidth. The circuit uses a multimode waveguide for a connecting part between a field modulation device and an AWG. The field modulation device is constituted by a common input waveguide, an optical branching unit, optical delay lines, a multiplex interference unit, and a mode converter/multiplexer.Type: GrantFiled: August 1, 2019Date of Patent: May 23, 2023Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Manabu Oguma, Osamu Moriwaki, Kenya Suzuki
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Patent number: 11493776Abstract: A polarization multiplex optical transmitter circuit can provide compensation for the transmission PDL while reducing decrease in transmission power. The polarization multiplex optical transmitter circuit includes a beam divider circuit configured to divide light outputted from a light source, optical phase shifters provided in at least one of two waveguides connected to output terminals of the beam divider circuit, a light wave synthesizer circuit connected to the two waveguides, first and second optical transmitters coupled to two output terminals of the light wave synthesizer circuit, a polarization multiplexer configured to synthesize two output polarized waves from the first and second optical transmitters, and a polarization rotator provided between the first and second optical transmitters and the polarization multiplexer and coupled to at least one of the first and second optical transmitters.Type: GrantFiled: December 24, 2019Date of Patent: November 8, 2022Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Yusuke Nasu, Manabu Oguma, Shogo Yamanaka, Makoto Jizodo
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Publication number: 20220269001Abstract: Provided is an optical wavelength multi/demultiplexing circuit with a high rectangular transmission loss spectrum that is able to secure loss flatness of a transmission band, maintain/reduce a guard bandwidth of wavelength channel spacing, and broaden a transmission bandwidth. The circuit uses a multimode waveguide for a connecting part between a field modulation device and an AWG. The field modulation device is constituted by a common input waveguide, an optical branching unit, optical delay lines, a multiplex interference unit, and a mode converter/multiplexer.Type: ApplicationFiled: August 1, 2019Publication date: August 25, 2022Inventors: Manabu Oguma, Osamu Moriwaki, Kenya Suzuki
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Publication number: 20220171127Abstract: To provide an optical 90-degree hybrid formed of a silicon waveguide capable of suppressing an optical loss and a phase error, and facilitating electronic packaging and optical packaging. In the optical 90-degree hybrid circuit including two optical branching units facing each other and two optical coupling units facing away from each other, four arm waveguides are arranged including bent waveguides each of which guides an output light of the optical branching unit to the optical coupling unit, and is formed in a curved shape.Type: ApplicationFiled: April 16, 2020Publication date: June 2, 2022Inventors: Makoto Jizodo, Manabu Oguma, Yusuke Nasu, Yuichiro Ikuma
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Publication number: 20220120965Abstract: An object is to improve crosstalk between ports while keeping an interposer circuit small. In an interposer circuit that includes a first surface connected to an optical circuit, a second surface that is connected to a fiber block and is located opposite to the first surface in parallel with the first surface, and a plurality of connection waveguides connected to a plurality of input/output waveguides included in the optical circuit and a plurality of input/output fibers included in the fiber block, the connection waveguides each have a straight shape, and an angle (?) formed between the first surface and each of the connection waveguides is the same as an angle (?) formed between the second surface and each of the connection waveguides.Type: ApplicationFiled: January 24, 2020Publication date: April 21, 2022Inventors: Yuichiro Ikuma, Yusuke Nasu, Manabu Oguma, Takashi Yamada
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Publication number: 20220091329Abstract: The invention provides a planar optical waveguide circuit capable of preventing part of the input signal light that has not been combined in the waveguide and propagates as leaked light from interfering with the output signal. A planar optical waveguide circuit having an optical waveguide embedded in a cladding layer includes: a plurality of parallel output optical waveguides configured to emit light from a same end face; a groove having a reflective interface formed at an angle of +45 degrees relative to the output optical waveguides and configured to reflect leaked light propagating in the cladding layer; and a groove having a reflective interface formed at an angle of ?45 degrees, the reflective interface formed at an angle of +45 degrees, the output optical waveguide, and the reflective interface formed at ?45 degrees being arranged repeatedly in that order.Type: ApplicationFiled: January 8, 2020Publication date: March 24, 2022Inventors: Osamu Moriwaki, Kenya Suzuki, Takashi Go, Manabu Oguma, Yuichiro Ikuma
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Publication number: 20220086538Abstract: A wavelength monitoring apparatus includes a wavelength monitoring circuit. The wavelength monitoring circuit includes: a split circuit that splits an input optical signal into two; an optical delay circuit that applies a delay time difference to the two split optical signals; and a two-input two-output optical multiplexer/demultiplexer circuit that outputs a result of applying multiplexing interference to the optical signals to which the delay time difference has been applied. The wavelength monitoring apparatus further includes photoelectric conversion elements that perform photoelectric conversions on the two optical signals output from the wavelength monitoring circuit so as to output electrical signals.Type: ApplicationFiled: January 8, 2020Publication date: March 17, 2022Inventors: Osamu Moriwaki, Takashi Saida, Kenya Suzuki, Takashi Go, Manabu Oguma, Yuichiro Ikuma
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Publication number: 20220066227Abstract: A polarization multiplex optical transmitter circuit can provide compensation for the transmission PDL while reducing decrease in transmission power. The polarization multiplex optical transmitter circuit includes a beam divider circuit configured to divide light outputted from a light source, optical phase shifters provided in at least one of two waveguides connected to output terminals of the beam divider circuit, a light wave synthesizer circuit connected to the two waveguides, first and second optical transmitters coupled to two output terminals of the light wave synthesizer circuit, a polarization multiplexer configured to synthesize two output polarized waves from the first and second optical transmitters, and a polarization rotator provided between the first and second optical transmitters and the polarization multiplexer and coupled to at least one of the first and second optical transmitters.Type: ApplicationFiled: December 24, 2019Publication date: March 3, 2022Inventors: Yusuke Nasu, Manabu Oguma, Shogo Yamanaka, Makoto Jizodo
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Publication number: 20220011508Abstract: A wavelength monitoring circuit obtains a light output proportional to only an input optical signal, independent of wavelength, by adding a light split circuit to the configuration in the related art, or changing the light split circuit to a light trifurcation circuit. In addition, wavelength monitoring with high accuracy is possible while improving the resistance to noise. The extraction of the light output proportional to only the input optical signal is performed by a light split circuit for input light at the top stage of the wavelength monitoring circuit or a light split circuit for interference in a stage in the middle of the circuit. The changed light split circuit causes the MZI included in the wavelength monitoring circuit to operate in a state of losing the balance of the configuration or the optical signal level, and increases the signal level near the bottom portion of the transmission characteristics.Type: ApplicationFiled: January 17, 2020Publication date: January 13, 2022Inventors: Osamu Moriwaki, Manabu Oguma, Kenya Suzuki, Takashi Go, Yuichiro Ikuma
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Patent number: 9407371Abstract: A multiplexer/demultiplexer that functions as an extremely small AWG optical filter in order to prepare a miniaturized and low-cost transceiver module necessary to realize a high speed transceiver for Ethernet (registered trademark). An optical multiplexer/demultiplexer includes: at least one input waveguide, a first slab waveguide, an arrayed waveguide group, a second slab waveguide, and at least one output waveguide. Each of the waveguides of the arrayed waveguide group has: a first bent part of which a waveguide extending direction changes 180 degrees or more; and a second bent part of which a waveguide extending direction changes 180 degrees or more in a direction opposite to a direction of the change of the first bent part.Type: GrantFiled: September 13, 2013Date of Patent: August 2, 2016Assignee: Nippon Telegraph and Telephone CorporationInventors: Manabu Oguma, Ikuo Ogawa, Yoshiyuki Doi, Masayuki Itoh, Hiroshi Takahashi
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Patent number: 9306670Abstract: The present invention relates to an optical coupling/splitting device that realizes the splitting of a down-signal and the coupling of up-signals by the same optical device, and reduces coupling losses of the up-signal. An optical coupling/splitting device in the present invention comprises an optical coupling/splitting means for coupling a plurality of up-signals in a multi-mode for output and splitting a down-signal in a single mode for output, and a two-way optical propagation means for propagating the up-signal that is output from the optical coupling/splitting means in a multi-mode for output and propagate the down-signal in a single mode to be output to the optical coupling/splitting means.Type: GrantFiled: September 27, 2012Date of Patent: April 5, 2016Assignee: Nippon Telegraph and Telephone CorporationInventors: Masamichi Fujiwara, Kenichi Suzuki, Naoto Yoshimoto, Manabu Oguma, Toshio Watanabe, Hiroshi Takahashi, Hiromasa Tanobe, Tsutomu Kitoh
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Publication number: 20150229400Abstract: A multiplexer/demultiplexer that functions as an extremely small AWG optical filter in order to prepare a miniaturized and low-cost transceiver module necessary to realize a high speed transceiver for Ethernet (registered trademark). An optical multiplexer/demultiplexer includes: at least one input waveguide, a first slab waveguide, an arrayed waveguide group, a second slab waveguide, and at least one output waveguide. Each of the waveguides of the arrayed waveguide group has: a first bent part of which a waveguide extending direction changes 180 degrees or more; and a second bent part of which a waveguide extending direction changes 180 degrees or more in a direction opposite to a direction of the change of the first bent part.Type: ApplicationFiled: September 13, 2013Publication date: August 13, 2015Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Manabu Oguma, Ikuo Ogawa, Yoshiyuki Doi, Masayuki Itoh, Hiroshi Takahashi
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Publication number: 20140186040Abstract: The present invention relates to an optical coupling/splitting device that realizes the splitting of a down-signal and the coupling of up-signals by the same optical device, and reduces coupling losses of the up-signal. An optical coupling/splitting device in the present invention comprises an optical coupling/splitting means for coupling a plurality of up-signals in a multi-mode for output and splitting a down-signal in a single mode for output, and a two-way optical propagation means for propagating the up-signal that is output from the optical coupling/splitting means in a multi-mode for output and propagate the down-signal in a single mode to be output to the optical coupling/splitting means.Type: ApplicationFiled: September 27, 2012Publication date: July 3, 2014Inventors: Masamichi Fujiwara, Kenichi Suzuki, Naoto Yoshimoto, Manabu Oguma, Toshio Watanabe, Hiroshi Takahashi, Hiromasa Tanobe, Tsutomu Kitoh
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Patent number: 8737779Abstract: An optical wavelength multi/demultiplexer having transmission characteristics with a higher rectangular degree than a conventional one includes an AWG and two-stage lattice circuit. An example of a two-stage lattice circuit according to the present invention includes an input waveguide, a third optical coupler, a third and fourth arm waveguides, a second optical coupler, a first and second arm waveguides, a first optical coupler, and output waveguides. The optical path length differences between the third and fourth arm waveguides and between the first and second arm waveguides are designed to be ?L. The path passing the third and first arm waveguides differs by 2·?L in optical length from that the fourth and second arm waveguides. The paths passing the third and second arm waveguides and passing the fourth and first arm waveguides differ by ?L from that passing the fourth and second arm waveguides.Type: GrantFiled: August 25, 2010Date of Patent: May 27, 2014Assignee: Nippon Telegraph and Telephone CorporationInventors: Tsutomu Kitoh, Shin Kamei, Toshikazu Hashimoto, Yohei Sakamaki, Hiroshi Takahashi, Manabu Oguma