Patents by Inventor Shinjiro Hagihara

Shinjiro Hagihara 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).

  • Publication number: 20100111486
    Abstract: The present invention relates to a dispersion compensating module having a configuration that can effectively suppress high-speed fluctuations in the polarization state of light even when being imparted with impact or vibration. In the dispersion compensating module, a dispersion compensating optical fiber is fixed while being wound around the barrel of a bobbin, and the bobbin is fixed in the inside of a housing via a buffer that absorbs impact or vibration. The bobbin corresponds to a holder holding the dispersion compensating optical fiber fixed in a state of coil. The housing corresponds to a struct fixing the holder. The buffer fills a space between the housing and the bobbin on which the dispersion compensating optical fiber is coiled.
    Type: Application
    Filed: November 3, 2009
    Publication date: May 6, 2010
    Applicant: Sumitomo Electric Industries, Ltd.
    Inventors: Tetsuya HAYASHI, Eisuke SASAOKA, Kazuya KUWAHARA, Takashi SASAKI, Yasushi KOYANO, Fumiyoshi OHKUBO, Shinjiro HAGIHARA
  • Publication number: 20080166088
    Abstract: A dispersion compensating fiber module having a dispersion compensating function has a fiber arranging portion including a plurality of fiber housing portions (housing) which are concentrically disposed and accommodate a dispersion compensating fiber, and a fiber connecting portion connecting the dispersion compensating fibers accommodated in three fiber housing portions.
    Type: Application
    Filed: January 4, 2008
    Publication date: July 10, 2008
    Inventor: Shinjiro Hagihara
  • Patent number: 6731847
    Abstract: The present invention relates to an optical fiber having a large positive dispersion in a wavelength band of 1.55 &mgr;m in order to compensate for a negative dispersion inherent in an NZ-DSF in the wavelength band of 1.55 &mgr;m. This optical fiber comprises a depressed cladding structure constituted by a core region; an inner cladding, provided on the outer periphery of the core region, having a lower refractive index; and an outer cladding having a higher refractive index. In this optical fiber, the relative refractive index difference of the core region with respect to the outer cladding is 0.30% or more but 0.50% or less, and the relative refractive index difference of the inner cladding with respect to the outer cladding is −0.50% or more but −0.02% or less. Also, the optical fiber has a dispersion greater than 18 ps/nm/km at a wavelength of 1.55 &mgr;m, and an effective area of 70 &mgr;m2 or more at the wavelength of 1.55 &mgr;m.
    Type: Grant
    Filed: April 25, 2000
    Date of Patent: May 4, 2004
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Takatoshi Kato, Kazuhiro Okamoto, Mitsuomi Hada, Shinjiro Hagihara, Morio Watanabe, Kohei Kobayashi
  • Patent number: 6614976
    Abstract: The present invention relates to an optical fiber having a large positive dispersion in a wavelength band of 1.55 &mgr;m in order to compensate for a negative dispersion inherent in an NZ-DSF in the wavelength band of 1.55 &mgr;m. This optical fiber comprises a depressed cladding structure constituted by a core region; an inner cladding, disposed at the outer periphery of the core region, having a lower refractive index; and an outer cladding having a higher refractive index. In this optical fiber, the relative refractive index difference of the core region with respect to the outer cladding is at least 0.30% but not greater than 0.50%, and the relative refractive index difference of the inner cladding with respect to the outer cladding is at least −0.50% but not greater than −0.02%. Also, the optical fiber has a dispersion greater than 18 ps/nm/km at a wavelength of 1.55 &mgr;m, and an effective cross-sectional area Aeff of at least 70 &mgr;m2 at the wavelength of 1.55 &mgr;m.
    Type: Grant
    Filed: January 7, 2002
    Date of Patent: September 2, 2003
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Takatoshi Kato, Kazuhiro Okamoto, Mitsuomi Hada, Shinjiro Hagihara, Morio Watanabe, Kohei Kobayashi
  • Publication number: 20020106172
    Abstract: The present invention relates to an optical fiber having a large positive dispersion in a wavelength band of 1.55 &mgr;m in order to compensate for a negative dispersion inherent in an NZ-DSF in the wavelength band of 1.55 &mgr;m. This optical fiber comprises a depressed cladding structure constituted by a core region; an inner cladding, disposed at the outer periphery of the core region, having a lower refractive index; and an outer cladding having a higher refractive index. In this optical fiber, the relative refractive index difference of the core region with respect to the outer cladding is at least 0.30% but not greater than 0.50%, and the relative refractive index difference of the inner cladding with respect to the outer cladding is at least −0.50% but not greater than −0.02%. Also, the optical fiber has a dispersion greater than 18 ps/nm/km at a wavelength of 1.55 &mgr;m, and an effective cross-sectional area Aeff of at least 70 &mgr;m2 at the wavelength of 1.55 &mgr;m.
    Type: Application
    Filed: January 7, 2002
    Publication date: August 8, 2002
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Takatoshi Kato, Kazuhiro Okamoto, Mitsuomi Hada, Shinjiro Hagihara, Morio Watanabe, Kohei Kobayashi
  • Patent number: 6337942
    Abstract: The present invention relates to an optical fiber having a large positive dispersion in a wavelength band of 1.55 &mgr;m in order to compensate for a negative dispersion inherent in an NZ-DSF in the wavelength band of 1.55 &mgr;m. This optical fiber comprises a depressed cladding structure constituted by a core region; an inner cladding, disposed at the outer periphery of the core region, having a lower refractive index; and an outer cladding having a higher refractive index. In this optical fiber, the relative refractive index difference of the core region with respect to the outer cladding is at least 0.30% but not greater than 0.50%, and the relative refractive index difference of the inner cladding with respect to the outer cladding is at least −0.50% but not greater than −0.02%. Also, the optical fiber has a dispersion greater than 18 ps/nm/km at a wavelength of 1.55 &mgr;m, and an effective cross-sectional area Aeff of at least 70 &mgr;m2 at the wavelength of 1.55 &mgr;m.
    Type: Grant
    Filed: November 17, 1999
    Date of Patent: January 8, 2002
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Takatoshi Kato, Kazuhiro Okamoto, Mitsuomi Hada, Shinjiro Hagihara, Morio Watanabe, Kohei Kobayashi