Patents by Inventor Makoto Shimaoka
Makoto Shimaoka 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: 6985505Abstract: The present invention provides a highly reliable ridge-waveguide semiconductor laser diode and an optical module. The p-side electrode of the ridge-waveguide laser diode has a first conductor layer region and a second conductor layer region formed on the first conductor layer region. At least one of facets of the second conductor layer region is recessed inward from a reflection facet. Thus, the ridge-waveguide semiconductor laser diode has a structure in which strain which is caused by the electrode stress to be applied on the diode facet is reduced and the saturable absorption does not occur. The ridge-waveguide semiconductor laser diode thus obtained is highly reliable, and the optical module using the same is remarkably high in reliability.Type: GrantFiled: May 17, 2005Date of Patent: January 10, 2006Assignee: Opnext Japan, Inc.Inventors: Etsuko Nomoto, Kouji Nakahara, Shinji Tsuji, Makoto Shimaoka
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Publication number: 20050207463Abstract: The present invention provides a highly reliable ridge-waveguide semiconductor laser diode and an optical module. The p-side electrode of the ridge-waveguide laser diode has a first conductor layer region and a second conductor layer region formed on the first conductor layer region. At least one of facets of the second conductor layer region is recessed inward from a reflection facet. Thus, the ridge-waveguide semiconductor laser diode has a structure in which strain which is caused by the electrode stress to be applied on the diode facet is reduced and the saturable absorption does not occur. The ridge-waveguide semiconductor laser diode thus obtained is highly reliable, and the optical module using the same is remarkably high in reliability.Type: ApplicationFiled: May 17, 2005Publication date: September 22, 2005Inventors: Etsuko Nomoto, Kouji Nakahara, Shinji Tsuji, Makoto Shimaoka
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Patent number: 6931215Abstract: A smaller and higher performance optical transmitter module is provided, which can improve the reliability and which can be manufactured at lower costs and allow for stable laser transmission of an optical semiconductor element. The optical transmitter module which has an optical semiconductor element, an optical fiber optically coupled to the optical semiconductor element, an inline optical isolator provided for the optical fiber, and a package case containing the optical semiconductor element and the optical fiber, includes a substrate member with one end of the optical fiber on the light incident side fixed thereon to be optically coupled to the optical semiconductor element, a thermoelectric cooler with the substrate member joined to the top surface thereof, and a pipe-like support member projecting from the side face of the package case for fixing the optical isolator.Type: GrantFiled: September 1, 2000Date of Patent: August 16, 2005Assignee: Hitachi, Ltd.Inventors: Kazuyuki Fukuda, Hideyuki Kuwano, Yoshitaka Fujiwara, Makoto Shimaoka
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Publication number: 20030165169Abstract: The present invention provides a highly reliable ridge-waveguide semiconductor laser diode and an optical module. The p-side electrode of the ridge-waveguide laser diode has a first conductor layer region and a second conductor layer region formed on the first conductor layer region. At least one of facets of the second conductor layer region is recessed inward from a reflection facet. Thus, the ridge-waveguide semiconductor laser diode has a structure in which strain which is caused by the electrode stress to be applied on the diode facet is reduced and the saturable absorption does not occur. The ridge-waveguide semiconductor laser diode thus obtained is highly reliable, and the optical module using the same is remarkably high in reliability.Type: ApplicationFiled: August 28, 2002Publication date: September 4, 2003Applicant: OpNext Japan, Inc.Inventors: Etsuko Nomoto, Kouji Nakahara, Shinji Tsuji, Makoto Shimaoka
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Patent number: 6332720Abstract: When an optical system is housed in a plastic case, an optical connection in the system might be changed by a deformation of the case due to heat and thermal resistance might be increased. It is important that the case has not only a function of housing the elements of the optical system, but also a function of ensuring that light is stably produced in the optical system, which, is the most important function of the case. Therefore, the deformation of the case due to a change in temperature is prevented by a frame inserted into the opening portion of the case and further by mounting the case on an external aluminum substrate. That is, stability in the optical connection is improved by improving the structure of the case and by mounting an case on the external substrate. Further, an increase in the thermal resistance is prevented in the same way by provision of the frame and the external aluminum substrate.Type: GrantFiled: September 16, 1999Date of Patent: December 25, 2001Assignee: Hitachi, Ltd.Inventors: Makoto Shimaoka, Tadaaki Ishikawa, Kazuyuki Fukuda, Katsumi Kuroguchi
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Patent number: 5675685Abstract: An optical semiconductor array module comprising an optical semiconductor array device constituted by a plurality of semiconductor laser diode, light-emitting diode elements or a plurality of semiconductor photo diode elements, an electronic device for driving and controlling the optical semiconductor array device, a cube-shaped package case for housing the optical semiconductor array device and the electronic device therein, an optical fiber array optically coupled to the optical semiconductor array device, a supporting member for holding and fixing the optical fiber array to one surface of the cube-shaped package case, and a terminal portion having a plurality of pins for electrically connecting an external circuit board to the electronic device.Type: GrantFiled: June 19, 1996Date of Patent: October 7, 1997Assignee: Hitachi Ltd.Inventors: Kazuyuki Fukuda, Makoto Shimaoka, Satoshi Kaneko, Kazuhiro Ito, Shinzo Nishiyama, Shigefumi Kito, Atsushi Takai, Atsushi Miura, Koichiro Tonehira
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Patent number: 5671316Abstract: A connecting structure of an optical fiber to an optical waveguide includes a circular cylindrical holder having a bore with a circular cross-section communicating one end thereof to the other. The protecting layer removal end of the optical fiber is inserted into the bore. An end plane of the protecting layer removal end and a side plane of the holder are co-planar to be connected to an end surface of an optical waveguide.Type: GrantFiled: February 14, 1996Date of Patent: September 23, 1997Assignee: Hitachi Cable, Ltd.Inventors: Toshiya Yuhara, Hisao Iitsuka, Kazuyuki Fukuda, Makoto Shimaoka, Tetsuo Kumazawa
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Patent number: 5195155Abstract: An optical coupling apparatus including a light emitting diode, a lens, an optical isolator and an optical fiber disposed on a common optical axis is improved in the optical coupling efficiency. The individual optical elements are roughly adjusted in the respective positions and fixed, and then a precise and fine adjustment is effectuated by plastically deforming a portion of a holder for supporting the lens or the optical isolator and/or by adjusting inclination of the holder. The holder imparted with the fine adjustment capability can be implemented as a lens holder.Type: GrantFiled: May 21, 1990Date of Patent: March 16, 1993Assignee: Hitachi, Ltd.Inventors: Makoto Shimaoka, Tetsuo Kumazawa, Yasutoshi Yagiu, Atsushi Sasayama
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Patent number: 5046798Abstract: A collimated-beam generating device using a semiconductor laser includes a two-lens system in which light converged by a first lens is converted into a collimated beam by a second lens, whereby a distance between the semiconductor laser and the first lens is made large, assembly of the device is made easy, and a collimated beam having a small beam diameter can be produced.Type: GrantFiled: August 1, 1989Date of Patent: September 10, 1991Assignee: Hitachi, Ltd.Inventors: Yasutoshi Yagiu, Tetsuo Kumazawa, Makoto Shimaoka, Kunio Aiki
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Patent number: 4880290Abstract: An optical fiber apparatus having an optical fiber jacket guide for receiving and guiding an optical fiber therethrough to enable proper optical coupling with an optical component of an opto-electronic package device. An optical fiber core extends through the jacket guide and has a coating material coated thereon and extending within at least a part of the jacket guide. At least a part of the coating material within the jacket guide has an irregular peripheral surface and adhesive within the jacket guide bonds at least the coating material and the jacket guide.Type: GrantFiled: September 21, 1987Date of Patent: November 14, 1989Assignee: Hitachi, Ltd.Inventors: Tetsuo Kumazawa, Makoto Shimaoka, Kazuyuki Fukuda, Eiichi Adachi