Patents by Inventor Naohiko Baba
Naohiko Baba 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: 20240096913Abstract: There is provided a solid-state imaging element capable of increasing a channel area of a pixel transistor and reducing a parasitic capacitance of a gate.Type: ApplicationFiled: November 9, 2021Publication date: March 21, 2024Inventors: AKIHIKO KATO, TOSHIHIRO KUROBE, AKIKO HONJO, KOICHI BABA, NAOHIKO KIMIZUKA, YOHEI HIROSE, TOYOTAKA KATAOKA, TAKUYA TOYOFUKU
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Patent number: 10379303Abstract: To provide an optical module and a method for aligning the optical module with which alignment can be easily performed. An optical module includes first optical element sections and a second optical element section optically joined to the first optical element sections. Each first optical element section includes an optical conversion element, a ferrule having a distal end being in contact with and optically joined to the second optical element section, and a first optical system disposed in a position where the ferrule and the optical conversion element are optically adjusted. The second optical element section includes joining sections in contact with and joined to, in joining parts, the distal ends of the ferrules, a wavelength multiplexing optical element optically joined to the optical conversion elements, and second optical systems respectively disposed in positions where the wavelength multiplexing optical elements and the joining parts are optically adjusted.Type: GrantFiled: March 22, 2017Date of Patent: August 13, 2019Assignee: Oclaro Japan, Inc.Inventors: Naohiko Baba, Hiroshi Yamamoto, Tomonao Kikuchi, Yasuhiro Yamada
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Patent number: 10129983Abstract: A base material includes a pair of end regions located on both sides in a first direction, and an intermediate region located between the pair of end regions. The intermediate region includes a pair of side edges on both sides in a second direction orthogonal to the first direction. Both the pair of side edges do not project outward in the second direction from the pair of end regions. At least one of the pair of side edges has a shape recessed inward in the second direction from the pair of end regions. Terminals include end pads and a side pad. The end pads are located in each of the pair of end regions of the base material and arranged in the second direction. The side pad is located at at least one of the pair of side edges of the base material.Type: GrantFiled: January 5, 2018Date of Patent: November 13, 2018Assignee: Oclaro Japan, Inc.Inventors: Yoshikuni Uchida, Naohiko Baba, Hideaki Asakura, Michihide Sasada, Kazuhiro Komatsu
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Publication number: 20180235087Abstract: A base material includes a pair of end regions located on both sides in a first direction, and an intermediate region located between the pair of end regions. The intermediate region includes a pair of side edges on both sides in a second direction orthogonal to the first direction. Both the pair of side edges do not project outward in the second direction from the pair of end regions. At least one of the pair of side edges has a shape recessed inward in the second direction from the pair of end regions. Terminals include end pads and a side pad. The end pads are located in each of the pair of end regions of the base material and arranged in the second direction. The side pad is located at at least one of the pair of side edges of the base material.Type: ApplicationFiled: January 5, 2018Publication date: August 16, 2018Inventors: Yoshikuni UCHIDA, Naohiko BABA, Hideaki ASAKURA, Michihide SASADA, Kazuhiro KOMATSU
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Publication number: 20170276889Abstract: To provide an optical module and a method for aligning the optical module with which alignment can be easily performed. An optical module includes first optical element sections and a second optical element section optically joined to the first optical element sections. Each first optical element section includes an optical conversion element, a ferrule having a distal end being in contact with and optically joined to the second optical element section, and a first optical system disposed in a position where the ferrule and the optical conversion element are optically adjusted. The second optical element section includes joining sections in contact with and joined to, in joining parts, the distal ends of the ferrules, a wavelength multiplexing optical element optically joined to the optical conversion elements, and second optical systems respectively disposed in positions where the wavelength multiplexing optical elements and the joining parts are optically adjusted.Type: ApplicationFiled: March 22, 2017Publication date: September 28, 2017Inventors: Naohiko BABA, Hiroshi YAMAMOTO, Tomonao KIKUCHI, Yasuhiro YAMADA
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Patent number: 7164865Abstract: An object of disclosed technology is to control lasing wavelengths so that a wavelength shift does not occurs. Another object is to permit wavelengths of a light source for wavelength division multiplexing optical-fiber communication system to be variable in response to an ITU-TS grid. A means for achieving the objects is as follows: locating an etalon in a light path of diode laser light, which is a parallel plane wave changed by a collimator lens; generating a wavelength error signal from a difference between both of divided pieces of light from transmitted light or reflected light; and locking a wavelength of a diode laser device according to the wavelength error signal.Type: GrantFiled: March 15, 2001Date of Patent: January 16, 2007Assignee: Opnext Japan, Inc.Inventors: Kimio Tatsuno, Tatemi Ido, Yasunori Iwafuji, Hideyuki Kuwano, Naohiko Baba
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Patent number: 7031620Abstract: An optical transmission system includes a current source for outputting a drive current, a semiconductor laser for converting the drive current into a stimulated emission light and producing the same, a drive circuit for converting a transmission data signal into a modulation control signal and outputting the same, an optical modulator for receiving the stimulated emission light and a shading control signal for interrupting light emission and producing and outputting transmission signal light by changing an amount of transmission of the stimulated emission light according to the shading control signal, and a shading element for receiving the transmission signal light and a shading control signal for interrupting light emission and interrupting the transmission of the transmission signal light according to the shading control signal whereby an optical signal having wrong optical wavelength is rapidly prevented.Type: GrantFiled: July 12, 2001Date of Patent: April 18, 2006Assignee: OpNext Japan, Inc.Inventors: Shigeru Tokita, Mitsuo Akashi, Naohiko Baba, Yoichi Honzawa, Hideki Satoh
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Patent number: 6829441Abstract: A driver circuit comprises a first differential-amplifier circuit having a pair of first transistors with emitters thereof connected to each other and a first resistor provided between an emitter connection point of the first transistors and a first power supply. Different electric potentials are applied to the bases of the pair of the first transistors to set a ratio of a current flowing through one of the pair of the first transistors to a current flowing through the other first transistor at about 1/100 or smaller. An amplitude of an output current is controlled by the higher of the electric potentials applied to the base of one of the first transistors.Type: GrantFiled: June 6, 2003Date of Patent: December 7, 2004Assignee: Opnext Japan, Inc.Inventors: Norio Chujo, Yoshihiko Hayashi, Akio Osaki, Naohiko Baba
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Patent number: 6661503Abstract: A method of manufacturing an optic transmission module assures a high reliability for the module by inspecting the character of a low bit error rate (BER) of the module quickly and accurately. The module is employed in an optical communication system (light transmission system) required to cope with information communication systems that are becoming faster and faster in operation and larger and larger in capacity. Also disclosed is a system and a method for inspection of the BER character which uses a rectangular wave pulse as an interference light to calculate a degradation quantity of a signal-to-noise ratio (S/N) on the basis of a simple theory, thereby inspecting the BER character by extrapolating a case in which there is no interference light (S/X=∞ or X=0) with use of a sign error rate theoretical value according to a bit error rate of a light signal measured according to the degradation quantity.Type: GrantFiled: May 12, 2000Date of Patent: December 9, 2003Assignee: Hitachi, Ltd.Inventors: Kazuo Yamaguchi, Takashi Minato, Shinzoo Nishiyama, Atsushi Murata, Naohiko Baba, Tsutomu Yoshiya, Kazumi Kawamoto, Kyouichi Yamamoto, Kazuo Aoyama
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Publication number: 20030198479Abstract: A driver circuit comprises a first differential-amplifier circuit having a pair of first transistors with emitters thereof connected to each other and a first resistor provided between an emitter connection point of the first transistors and a first power supply. Different electric potentials are applied to the bases of the pair of the first transistors to set a ratio of a current flowing through one of the pair of the first transistors to a current flowing through the other first transistor at about 1/100 or smaller. An amplitude of an output current is controlled by the higher of the electric potentials applied to the base of one of the first transistors.Type: ApplicationFiled: June 6, 2003Publication date: October 23, 2003Inventors: Norio Chujo, Yoshihiko Hayashi, Akio Osaki, Naohiko Baba
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Patent number: 6606177Abstract: A driver circuit comprises a first differential-amplifier circuit having a pair of first transistors with emitters thereof connected to each other and a first resistor provided between an emitter connection point of the first transistors and a first power supply. Different electric potentials are applied to the bases of the pair of the first transistors to set a ratio of a current flowing through one of the pair of the first transistors to a current flowing through the other first transistor at about {fraction (1/100)} or smaller. An amplitude of an output current is controlled by the higher of the electric potentials applied to the base of one of the first transistors.Type: GrantFiled: September 9, 1999Date of Patent: August 12, 2003Assignee: Hitachi, Ltd.Inventors: Norio Chujo, Yoshihiko Hayashi, Akio Osaki, Naohiko Baba
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Patent number: 6501583Abstract: Two sets of a high speed differential amplifier and a low speed differential amplifier are prepared, and frequency response speeds of these high speed/low speed differential amplifiers are different from each other. Both an oscillating frequency and a frequency modulation sensitivity of a ring oscillator type voltage-controlled oscillator circuit can be separately set by adding two outputs of these differential amplifiers to each other and by varying the selection ratio of these high speed/low speed differential amplifiers in a linear manner. Thus, the setting ranges for the oscillating frequency and the frequency modulation sensitivity are enlarged. At this time, since a summation of currents flowing through the high speed/low speed differential amplifiers is continuously made constant, the oscillating frequency depending characteristic of the output amplitude of the VCO circuit can be canceled.Type: GrantFiled: October 14, 1999Date of Patent: December 31, 2002Assignee: OpNext Japan, Inc.Inventors: Mitsuo Akashi, Hiroki Irie, Yasuhiro Yamada, Akihiro Hayami, Naohiko Baba, Tomonao Kikuchi
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Publication number: 20020061035Abstract: An optical transmission system includes a current source for outputting a drive current, a semiconductor laser for converting the drive current into a stimulated emission light and producing the same, a drive circuit for converting a transmission data signal into a modulation control signal and outputting the same, an optical modulator for receiving the stimulated emission light and a shading control signal for interrupting light emission and producing and outputting transmission signal light by changing an amount of transmission of the stimulated emission light according to the shading control signal, and a shading element for receiving the transmission signal light and a shading control signal for interrupting light emission and interrupting the transmission of the transmission signal light according to the shading control signal whereby an optical signal having wrong optical wavelength is rapidly prevented.Type: ApplicationFiled: July 12, 2001Publication date: May 23, 2002Applicant: Hitachi,Ltd.Inventors: Shigeru Tokita, Mitsuo Akashi, Naohiko Baba, Yoichi Honzawa, Hideki Satoh
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Publication number: 20020051270Abstract: An object of disclosed technology is to control lasing wavelengths so that a wavelength shift does not occurs. Another object is to permit wavelengths of a light source for wavelength division multiplexing optical-fiber communication system to be variable in response to an ITU-TS grid. A means for achieving the objects is as follows: locating an etalon in a light path of diode laser light, which is a parallel plane wave changed by a collimator lens; generating a wavelength error signal from a difference between both of divided pieces of light from transmitted light or reflected light; and locking a wavelength of a diode laser device according to the wavelength error signal.Type: ApplicationFiled: March 15, 2001Publication date: May 2, 2002Inventors: Kimio Tatsuno, Tatemi Ido, Yasunori Iwafuji, Hideyuki Kuwano, Naohiko Baba
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Patent number: 6229832Abstract: An optical transmitter includes a plurality of optical wavelength stability control apparatuses, each of which is capable of compensating for a wavelength drift by varying a laser diode drive current. Each of the optical wavelength stability control apparatuses detects a laser diode drive current, which is controlled by an auto power control circuit, by using a laser diode drive current detector. The laser diode drive current is normalized by a laser diode drive current increase/decrease normalization unit. A laser diode temperature control target value is generated at a compensated reference voltage generator, in response to the normalized laser diode drive current, to control a current value applied to a thermoelectric cooler so that an output value of a temperature monitor circuit approaches a predetermined laser diode temperature control target value.Type: GrantFiled: November 10, 1998Date of Patent: May 8, 2001Assignee: Hitachi, Ltd.Inventors: Naohiko Baba, Hideyuki Serizawa, Akihiro Hayami, Tadashi Hatano, Yasuhiro Yamada, Norio Chujo