Patents by Inventor Osamu Kasuu

Osamu Kasuu 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).

  • Patent number: 7486862
    Abstract: A core rod is inserted into a cladding pipe, moisture in a space between the core rod and the cladding pipe is removed, and an optical fiber is drawn while the space is connected to a dry-gas atmosphere and/or being decompressed and while the core rod and the cladding pipe are being unified with each other. Alternatively, the core rod is inserted into the cladding pipe, and an optical fiber is drawn from one end while moisture on the surface of the core rod and the internal surface of the cladding pipe is being removed. Accordingly, a high quality optical fiber is manufactured with good productivity.
    Type: Grant
    Filed: May 18, 2004
    Date of Patent: February 3, 2009
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Yuichi Ohga, Masashi Onishi, Osamu Kasuu, Shuichiro Kato, Toru Adachi, Takashi Sasaki, Masaaki Hirano
  • Publication number: 20080107385
    Abstract: A core rod is inserted into a cladding pipe, moisture in a space between the core rod and the cladding pipe is removed, and an optical fiber is drawn while the space is connected to a dry-gas atmosphere and/or being decompressed and while the core rod and the cladding pipe are being unified with each other. Alternatively, the core rod is inserted into the cladding pipe, and an optical fiber is drawn from one end while moisture on the surface of the core rod and the internal surface of the cladding pipe is being removed. Accordingly, a high quality optical fiber is manufactured with good productivity.
    Type: Application
    Filed: May 18, 2004
    Publication date: May 8, 2008
    Inventors: Yuichi Ohga, Masashi Onishi, Osamu Kasuu, Shuichiro Kato, Toru Adachi, Takashi Sasaki, Masaaki Hirano
  • Patent number: 6886998
    Abstract: An object is to provide an optical fiber fusion splicing method in which splice loss can be reduced, and also to provide an arc-heating unit used for heating the fusion spliced part of an optical fiber. The method comprises a process of fusion-splicing together the end faces of two optical fibers and a process of continuously heating the fusion spliced part by arc while moving one pair of electrodes provided opposite to each other across the fusion spliced part. The arc heating process is performed with the operation for decreasing arc temperature.
    Type: Grant
    Filed: May 21, 2002
    Date of Patent: May 3, 2005
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Osamu Kasuu, Motonori Nakamura, Tomomi Sano, Tomomi Moriya, Shinji Kayou
  • Patent number: 6854293
    Abstract: A method of fusion-splicing optical fibers having different mode field diameters or small mode field diameters is provided, which method is advantageous in that the splicing loss is smaller. The method comprises a fusion splicing process in which fusion splicing is performed by butting end faces of two optical fibers together and a heat treatment process in which the fusion spliced part of the optical fibers and the vicinity thereof are heated. The heat treatment process is performed by moving an arc heating unit in a direction other than the Y-axis direction (a direction perpendicular to the Z-axis direction and the opposing direction of arc electrodes) and Z-axis direction (the axial direction of the optical fiber), via the fusion spliced part in a Y-Z plane formed by the Y-axis direction and Z-axis direction.
    Type: Grant
    Filed: February 11, 2002
    Date of Patent: February 15, 2005
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Osamu Kasuu, Motonori Nakamura, Tomomi Sano, Tomomi Moriya, Shinji Kayou
  • Patent number: 6705772
    Abstract: An optical fiber splicing method capable of fully reducing the splice loss at room temperature is provided. In the optical fiber splicing method in accordance with the present invention, respective end faces of optical fibers are fused together in a splicing step (S101). In a condition setting step (S102), a set value &agr;0 is set. Thereafter, a heating step (S103), a measuring step (S104), and a termination determining step (S105) are carried out repeatedly. In the heating step, a region including the fusion-spliced point is heated under a predetermined heating condition. In the measuring step, splice loss is measured. In the termination determining step, the splice loss &agr;n measured in the measuring step and the set value &agr;0 set in the condition setting step are compared with each other in terms of magnitude.
    Type: Grant
    Filed: June 5, 2002
    Date of Patent: March 16, 2004
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Motonori Nakamura, Osamu Kasuu, Daisuke Yokota, Yuichi Ohga
  • Publication number: 20040028372
    Abstract: An optical fiber is immersed in a liquid having a low viscosity of not more than 1 Pa·s at 20° C., so that the liquid can permeate into gaps between turns of the optical fiber, and stresses, caused by a result of contact between the turns of the optical fiber, are eliminated, and in this state transmission characteristics of the optical fiber are measured.
    Type: Application
    Filed: March 14, 2003
    Publication date: February 12, 2004
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD
    Inventors: Katsuya Nagayama, Osamu Kasuu, Tatsuo Saitoh
  • Patent number: 6666591
    Abstract: Methods for connecting two optical fibers having different mode field diameters ((MFD) with low connection loss is proposed. One method comprises steps of preparing the third fiber (Fiber 3), a short length and MFD being smaller than that of the first fiber (Fiber 1) and larger than that of the second (Fiber 2), connecting the Fiber 1 to 3, connecting Fiber 2 to 3, and increasing MFD of Fiber 3 near the part connected or to be connected to Fiber 1, or MFD of Fiber 2 near the part connected or to be connected to Fiber 3 by heating the corresponding part. The other method comprises steps of preparing a short length Fiber 3 having smaller MFD than that of Fiber 1, increasing MFD of Fiber 3 near the part to be connected to Fiber 1 by heating the corresponding part, and then connecting Fiber 1 to 3, and 3 to 2 in that order.
    Type: Grant
    Filed: August 28, 2001
    Date of Patent: December 23, 2003
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Eisuke Sasaoka, Motonori Nakamura, Osamu Kasuu
  • Publication number: 20020181904
    Abstract: An optical fiber splicing method capable of fully reducing the splice loss at room temperature is provided. In the optical fiber splicing method in accordance with the present invention, respective end faces of optical fibers are fused together in a splicing step (S101). In a condition setting step (S102), a set value &agr;0 is set. Thereafter, a heating step (S103), a measuring step (S104), and a termination determining step (S105) are carried out repeatedly. In the heating step, a region including the fusion-spliced point is heated under a predetermined heating condition. In the measuring step, splice loss is measured. In the termination determining step, the splice loss &agr;n measured in the measuring step and the set value &agr;0 set in the condition setting step are compared with each other in terms of magnitude.
    Type: Application
    Filed: June 5, 2002
    Publication date: December 5, 2002
    Applicant: Sumitomo Electric Industries, Ltd.
    Inventors: Motonori Nakamura, Osamu Kasuu, Daisuke Yokota, Yuichi Ohga
  • Publication number: 20020176673
    Abstract: An object is to provide an optical fiber fusion splicing method in which splice loss can be reduced, and also to provide an arc-heating unit used for heating the fusion spliced part of an optical fiber. The method comprises a process of fusion-splicing together the end faces of two optical fibers and a process of continuously heating the fusion spliced part by arc while moving one pair of electrodes provided opposite to each other across the fusion spliced part. The arc heating process is performed with the operation for decreasing arc temperature.
    Type: Application
    Filed: May 21, 2002
    Publication date: November 28, 2002
    Applicant: Sumitomo Electric Industries, Ltd.
    Inventors: Osamu Kasuu, Motonori Nakamura, Tomomi Sano, Tomomi Moriya, Shinji Kayou
  • Publication number: 20020157424
    Abstract: A method of fusion-splicing optical fibers having different mode field diameters or small mode field diameters is provided, which method is advantageous in that the splicing loss is smaller. The method comprises a fusion splicing process in which fusion splicing is performed by butting end faces of two optical fibers together and a heat treatment process in which the fusion spliced part of the optical fibers and the vicinity thereof are heated. The heat treatment process is performed by moving an arc heating unit in a direction other than the Y-axis direction (a direction perpendicular to the Z-axis direction and the opposing direction of arc electrodes) and Z-axis direction (the axial direction of the optical fiber), via the fusion spliced part in a Y-Z plane formed by the Y-axis direction and Z-axis direction.
    Type: Application
    Filed: February 11, 2002
    Publication date: October 31, 2002
    Applicant: Sumitomo Electric Industries, Ltd.
    Inventors: Osamu Kasuu, Motonori Nakamura, Tomomi Sano, Tomomi Moriya, Shinji Kayou
  • Publication number: 20020057877
    Abstract: Methods for connecting two optical fibers having different mode field diameters ((MFD) with low connection loss is proposed. One method comprises steps of preparing the third fiber (Fiber 3), a short length and MFD being smaller than that of the first fiber (Fiber 1) and larger than that of the second (Fiber 2), connecting the Fiber 1 to 3, connecting Fiber 2 to 3, and increasing MFD of Fiber 3 near the part connected or to be connected to Fiber 1, or MFD of Fiber 2 near the part connected or to be connected to Fiber 3 by heating the corresponding part. The other method comprises steps of preparing a short length Fiber 3 having smaller MFD than that of Fiber 1, increasing MFD of Fiber 3 near the part to be connected to Fiber 1 by heating the corresponding part, and then connecting Fiber 1 to 3, and 3 to 2 in that order.
    Type: Application
    Filed: August 28, 2001
    Publication date: May 16, 2002
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD
    Inventors: Eisuke Sasaoka, Motonori Nakamura, Osamu Kasuu