Patents by Inventor Kohsuke Nishimura
Kohsuke Nishimura 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: 7196833Abstract: An apparatus for simultaneous OTDM demultiplexing, electrical clock recovery and optical clock generation, and optical clock recovery using a traveling-wave electroabsorption modulator. The apparatus includes a TW-EAM and a PLL coupled thereto. The TW-EAM includes a first, a second, a third, and a fourth. The first port is used for an optical input and the third port is used for optical output. The second port is coupled to an input, and the fourth port is coupled to an output, of the PLL. When the first port receives optical input, the second port produces a photocurrent to be applied to the PLL, and the fourth port receives a recovered clock produced by the PLL, and the third port produces demultiplexed data and an optical clock. Using the same configuration, the apparatus produces a recovered optical clock signal.Type: GrantFiled: August 23, 2005Date of Patent: March 27, 2007Assignees: KDDI R&D Laboratories, Inc., The Regents of the University of CaliforniaInventors: Zhaoyang Hu, Kohsuke Nishimura, Hsu-Feng Chou, Daniel J. Blumenthal, John E. Bowers, Ryo Inohara, Masashi Usami
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Patent number: 7184189Abstract: An apparatus for simultaneous OTDM demultiplexing, electrical clock recovery and optical clock generation, and optical clock recovery using a traveling-wave electroabsorption modulator. The apparatus includes a TW-EAM and a PLL coupled thereto. The TW-EAM includes a first, a second, a third, and a fourth. The first port is used for an optical input and the third port is used for optical output. The second port is coupled to an input, and the fourth port is coupled to an output, of the PLL. When the first port receives optical input, the second port produces a photocurrent to be applied to the PLL, and the fourth port receives a recovered clock produced by the PLL, and the third port produces demultiplexed data and an optical clock. Using the same configuration, the apparatus produces a recovered optical clock signal.Type: GrantFiled: August 23, 2005Date of Patent: February 27, 2007Assignees: KDDI R&D Laboratories, Inc., The Regents of the University of CaliforniaInventors: Zhaoyang Hu, Kohsuke Nishimura, Hsu-Feng Chou, Daniel J. Blumenthal, John E. Bowers, Ryo Inohara, Masashi Usami
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Publication number: 20060056854Abstract: An apparatus for simultaneous OTDM demultiplexing, electrical clock recovery and optical clock generation, and optical clock recovery using a traveling-wave electroabsorption modulator. The apparatus includes a TW-EAM and a PLL coupled thereto. The TW-EAM includes a first, a second, a third, and a fourth. The first port is used for an optical input and the third port is used for optical output. The second port is coupled to an input, and the fourth port is coupled to an output, of the PLL. When the first port receives optical input, the second port produces a photocurrent to be applied to the PLL, and the fourth port receives a recovered clock produced by the PLL, and the third port produces demultiplexed data and an optical clock. Using the same configuration, the apparatus produces a recovered optical clock signal.Type: ApplicationFiled: August 23, 2005Publication date: March 16, 2006Applicants: KDDI R&D Laboratories Inc., The Regents of the University of CaliforniaInventors: Zhaoyang Hu, Kohsuke Nishimura, Hsu-Feng Chou, Daniel Blumenthal, John Bowers, Ryo Inohara, Masashi Usami
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Publication number: 20060056853Abstract: An apparatus for simultaneous OTDM demultiplexing, electrical clock recovery and optical clock generation, and optical clock recovery using a traveling-wave electroabsorption modulator. The apparatus includes a TW-EAM and a PLL coupled thereto. The TW-EAM includes a first, a second, a third, and a fourth. The first port is used for an optical input and the third port is used for optical output. The second port is coupled to an input, and the fourth port is coupled to an output, of the PLL. When the first port receives optical input, the second port produces a photocurrent to be applied to the PLL, and the fourth port receives a recovered clock produced by the PLL, and the third port produces demultiplexed data and an optical clock. Using the same configuration, the apparatus produces a recovered optical clock signal.Type: ApplicationFiled: August 23, 2005Publication date: March 16, 2006Applicants: KDDI R&D Laboratories Inc., The Regents of the University of CaliforniaInventors: Zhaoyang Hu, Kohsuke Nishimura, Hsu-Feng Chou, Daniel Blumenthal, John Bowers, Ryo Inohara, Masashi Usami
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Patent number: 6907152Abstract: A ring resonator comprises a ring waveguide (12) of a first relative refractive index difference having a narrow part (12a), and an optical waveguide (14) of a second relative refractive index difference smaller than the first relative refractive index difference. The optical waveguide is disposed adjacent to the narrow part to optically couple with the narrow part.Type: GrantFiled: July 10, 2003Date of Patent: June 14, 2005Assignee: KDDI CorporationInventors: Hidenori Takahashi, Masashi Usami, Kohsuke Nishimura
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Publication number: 20050018271Abstract: An apparatus for simultaneous OTDM demultiplexing, electrical clock recovery and optical clock generation, and optical clock recovery using a traveling-wave electroabsorption modulator. The apparatus includes a TW-EAM and a PLL coupled thereto. The TW-EAM includes a first, a second, a third, and a fourth. The first port is used for an optical input and the third port is used for optical output. The second port is coupled to an input, and the fourth port is coupled to an output, of the PLL. When the first port receives optical input, the second port produces a photocurrent to be applied to the PLL, and the fourth port receives a recovered clock produced by the PLL, and the third port produces demultiplexed data and an optical clock. Using the same configuration, the apparatus produces a recovered optical clock signal.Type: ApplicationFiled: March 16, 2004Publication date: January 27, 2005Applicants: KDDI R&D Laboratories Inc., The Regents of the University of CaliforniaInventors: Zhaoyang Hu, Kohsuke Nishimura, Hsu-Feng Chou, Daniel Blumenthal, John Bowers, Ryo Inohara, Masashi Usami
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Publication number: 20040040646Abstract: A ring resonator comprises a ring waveguide (12) of a first relative refractive index difference having a narrow part (12a), and an optical waveguide (14) of a second relative refractive index difference smaller than the first relative refractive index difference. The optical waveguide is disposed adjacent to the narrow part to optically couple with the narrow part.Type: ApplicationFiled: July 10, 2003Publication date: March 4, 2004Inventors: Hidenori Takahashi, Masashi Usami, Kohsuke Nishimura
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Patent number: 6403391Abstract: At least a one conductivity type nanostructure PS layer whose thickness is controlled, and the opposite conductivity type nanostructure PS layer and a one conductivity type mesostructure PS layer arranged in contact with both these sides are comprised. Since the one conductivity type nanostructure PS layer is formed by anodizing the non-degenerate n-type crystalline silicon layer whose thickness is established in advance, the thickness which can provides a maximum luminescence efficiency can be obtained correctly. Then a semiconductor light emitting device whose luminescence efficiency is improved without increasing an unnecessary series resistance is provided. An inexpensive semiconductor light emitting device having a large light emitting area can be provided, since silicon wafer having a large diameter can be employed as the material for light emission.Type: GrantFiled: January 11, 2000Date of Patent: June 11, 2002Assignee: Kokusai Denshin Denwa Kabushiki-KaishaInventors: Kohsuke Nishimura, Yasuyuki Nagao
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Patent number: 6037612Abstract: At least a one conductivity type nanostructure PS layer whose thickness is controlled, and the opposite conductivity type nanostructure PS layer and a one conductivity type mesostructure PS layer arranged in contact with both these sides are comprised. Since the one conductivity type nanostructure PS layer is formed by anodizing the non-degenerate n-type crystalline silicon layer whose thickness is established in advance, the thickness which can provides a maximum luminescence efficiency can be obtained correctly. Then a semiconductor light emitting device whose luminescence efficiency is improved without increasing an unnecessary series resistance is provided.Type: GrantFiled: September 9, 1998Date of Patent: March 14, 2000Assignee: Kokusai Denshin Denwa Kabushiki KaishaInventors: Kohsuke Nishimura, Yasuyuki Nagao
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Patent number: 5450813Abstract: Nitrogen-doped group II-VI compound semiconductor thin film manufacturing method and apparatus which are applicable to an MOVPE process. The group II-VI compound semiconductor thin film manufacturing method according to the present invention is characterized by the use of osmium as a catalyst to activate nitrogen molecules. The growth device according to the present invention has a construction wherein a nitrogen gas introducing pipe for blowing a nitrogen gas against a semiconductor substrate is disposed in a reaction chamber for growing the group II-VI compound semiconductor thin film by the MOVPE process and the osmium is disposed between the semiconductor substrate and the nitrogen gas introducing pipe.Type: GrantFiled: March 3, 1994Date of Patent: September 19, 1995Assignee: Kokusain Denshin Denwa Kabushiki KaishaInventors: Kohsuke Nishimura, Yasuyuki Nagao, Kazuo Sakai
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Patent number: 5423284Abstract: A method which permits the growth of high-quality crystals of n-type II-VI compound semiconductors containing sulfur, by suppressing the reaction of a group III or VII element as a dopant with a group II material at low temperature. A raw material gas containing an organometallic material of the group III or organic material of the group VII is premixed with a raw material gas containing organic sulfur material, then the premixture is mixed with a raw material gas containing an organometallic material of the group II, and the mixture is used to grow a crystal of an n-type II-VI compound semiconductor on a semiconductor substrate by a metal organic vapor phase epitaxial growth method.Type: GrantFiled: March 14, 1994Date of Patent: June 13, 1995Assignee: Kokusai Denshin Denwa Kabushiki KaishaInventors: Kohsuke Nishimura, Kazuo Sakai, Yasuyuki Nagao
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Patent number: 5010376Abstract: A light emitting semiconductor device which emits blue and/or green light has an active layer and a pair of clad layers which sandwich the active layer (3), deposited on a substrate (1). The substrate (1) is made of GaAs, InP, GaAsP or Ge. Said active layer (3) and said clad layers (2, 4) are made of II-VI group compound semiconductor which is lattice-matched with the substrate at both room temperature and growing temperature, for instance 500.degree. C. Said II-VI group compound semiconductor has the same linear thermal expansion coefficient as that of the substrate. The linear thermal expansion coefficient of the II-IV group compound semiconductor is adjusted by additive of Cd, Mg or Hg.Type: GrantFiled: July 31, 1990Date of Patent: April 23, 1991Assignee: Kokusai Denshin Denwa Co., Ltd.Inventors: Kohsuke Nishimura, Kazuo Sakai
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Patent number: 4992837Abstract: A light emitting semiconductor device which emits blue and/or green light has an active layer and a pair of clad layers which sandwich the active layer, and which are deposited on a semiconductor substrate. The substrate is made of one of GaAs, GaP, InP, Si, Ge, ZnSe and mixed crystals of GaAsP. The active layer is made of at least one of II-VI group compound semiconductor, I-III-VI.sub.2 group compound semiconductor, and II-IV-V.sub.2 group compound semiconductor. The clad layer is made of II-transition metal-VI group compound semiconductor, which is lattice-matched to the active layer.Type: GrantFiled: November 7, 1989Date of Patent: February 12, 1991Assignee: Kokusai Denshin Denwa Co., Ltd.Inventors: Kazuo Sakai, Yukitoshi Kushiro, Kohsuke Nishimura