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    Optical fiber and method of making the same
    92.
    发明专利
    Optical fiber and method of making the same 未知

    公开(公告)号：AU6549701A

    公开(公告)日：2002-03-07

    申请号：AU6549701

    申请日：2001-08-27

    Applicant: SUMITOMO ELECTRIC INDUSTRIES

    Inventor： NAGAYAMA KATSUYA ,  UCHIYAMA TAKENORI ,  TSUCHIYA ICHIRO ,  ISHIKAWA SHINJI ,  SAITOH TATSUHIKO ,  OHGA YUICHI

    IPC: C03B37/027 ,  C03B37/029 ,  C03B37/15 ,  G02B6/02 ,  G02B6/036 ,  G02B6/16 ,  B29D31/00

    Abstract: An optical fiber preform 2 having a viscosity ratio R eta = eta 0/ eta t of 2.5 or less between the core average viscosity eta 0 and the total average viscosity eta t is prepared, and is drawn by a drawing furnace 11 so as to yield an optical fiber 3, which is then heated to a temperature within a predetermined range so as to be annealed by a heating furnace 21 disposed downstream the drawing furnace 11. Here, upon annealing in the heating furnace 21, the fictive temperature Tf within the optical fiber lowers, thereby reducing the Rayleigh scattering loss. At the same time, the viscosity ratio condition of R eta ≤ 2.5 restrains the stress from being concentrated into the core, thereby lowering the occurrence of structural asymmetry loss and the like . Hence, an optical fiber which can reduce the transmission loss caused by the Rayleigh scattering loss and the like as a whole, and a method of making the same can be obtained.

    OPTICAL FIBER AND METHOD OF MAKING THE SAME
    93.
    发明专利
    OPTICAL FIBER AND METHOD OF MAKING THE SAME 未知

    公开(公告)号：CA2355823A1

    公开(公告)日：2002-02-28

    申请号：CA2355823

    申请日：2001-08-27

    Applicant: SUMITOMO ELECTRIC INDUSTRIES

    Inventor： UCHIYAMA TAKENORI ,  NAGAYAMA KATSUYA ,  TSUCHIYA ICHIRO ,  ISHIKAWA SHINJI ,  OHGA YUICHI ,  SAITOH TATSUHIKO

    IPC: C03B37/027 ,  C03B37/029 ,  C03B37/15 ,  G02B6/02 ,  G02B6/036 ,  G02B6/16

    Abstract: An optical fiber preform 2 having a viscosity ratio R.eta. = .eta.o/.eta.t of 2.5 or less between the core average viscosit y .eta.o and the total average viscosity .eta.t is prepared, and is drawn by a drawing furnace 11 so as to yield an optical fiber 3, which is then heated to a temperature within a predetermined range so as to be annealed by a heating furnace 21 disposed downstream the drawing furnace 11. Here, upon annealing in the heating furnace 21, the fictive temperature Tf within the optical fiber lowers, thereby reducing the Rayleigh scattering loss . At the same time, the viscosity ratio condition of R.eta. .ltoreq.2.5 restrains the stress from being concentrated into the core, thereby lowering the occurrence of structural asymmetry loss and the like . Hence, an optical fiber which can reduce the transmission loss caused by the Rayleigh scattering loss and the like as a whole, and a method of making the same can be obtained.

    Resin coating applicator for an optical fiber
    95.
    发明专利
    Resin coating applicator for an optical fiber 未知

    公开(公告)号：AU723483B2

    公开(公告)日：2000-08-31

    申请号：AU5392998

    申请日：1998-02-13

    Applicant: SUMITOMO ELECTRIC INDUSTRIES

    Inventor： TSUCHIYA ICHIRO ,  OKUNO KAORU ,  MIYAKI HIDEO ,  OISHI KAZUMASA

    IPC: G02B6/44 ,  C03C25/12 ,  C03C25/18 ,  D06B1/08 ,  C03B37/083 ,  B05B1/24 ,  B05D1/00 ,  B05C9/00 ,  B05D7/20

    Abstract: In a resin coating applicator, a holder (14) is fixed on a base (15) fitted to a drawing machine, and in the holder (14), hot water can be circulated from an inlet (18). The inner circumferential surface of the holder (14) is formed into a tapered shape so that the outer circumferential surface of a cup-like member (14) of a cartridge type coating sub-assembly (1) is fitted to the holder (14). The respective outer circumferential surfaces of a nipple (2) and a coating die (3) are cylindrical so as to be fitted to the inner circumferential surfaces of an inner cylindrical member (6), and they are positioned by a step portion. Further, they are pressed from the upper and lower sides by the bottom portion of the cup-like member (4) and a lid member (5). The lid member (5) is fastened to the cup-like member (4) integrally by a thread.

    96.
    发明专利
    未知

    公开(公告)号：DE69604974T2

    公开(公告)日：2000-04-13

    申请号：DE69604974

    申请日：1996-07-04

    Applicant: SUMITOMO ELECTRIC INDUSTRIES

    Inventor： TSUCHIYA ICHIRO ,  KOBAYASHI KOHEI ,  OHTA HIROAKI ,  KUWAHARA KAZUYA ,  TSUNEISHI KATSUYUKI ,  MIYAKI HIDEO ,  MATSUDA YASUO

    IPC: G02B6/00 ,  C03B37/027 ,  C03B37/029 ,  H05B3/14 ,  H05B3/44 ,  H05B3/62 ,  F27D11/02

    Abstract: There is provided an optical fiber drawing furnace capable of drawing an optical fiber (20) having small non-circularity, which drawing furnace includes a muffle tube (13), in which an optical fiber preform (15) is supplied, a heater (18) surrounding the muffle tube (13), a plurality of electrode connecting portion (22-25) extending from the heater (18), a plurality of electrodes (29, 30) connected to electrode connecting portions (22-25), and in conjunction therewith to an electric power source (33), and unifying means for unifying the temperature distribution along the circumferential direction. Also, there is provided an optical fiber drawing furnace capable of drawing an optical fiber (20) having small non-circularity, which drawing furnace includes an inner heater (41) surrounding a muffle tube (13), a pair of inner electrode connecting portions (43) extending from the inner heater (41), arranging in opposition to each other across the inner heater (41) and connecting to a power source (39) via a pair of electrodes (44), an outer heater (42) surrounding the inner heater (41), and a pair of outer electrode connecting portions (45) extended from the outer heater (42) and arranged in opposition to each other across the outer heater (42) in a direction perpendicular to opposing direction of the pair of inner electrode connecting portions (43), the outer electrode connecting portions (45) being connected to the power source (39) via a pair of electrodes (46).

    Optical fiber drawing furnace
    97.
    发明专利
    Optical fiber drawing furnace 未知

    公开(公告)号：AU718301B2

    公开(公告)日：2000-04-13

    申请号：AU5834196

    申请日：1996-07-04

    Applicant: SUMITOMO ELECTRIC INDUSTRIES

    Inventor： TSUCHIYA ICHIRO ,  KOBAYASHI KOHEI ,  OHTA HIROAKI ,  KUWAHARA KAZUYA ,  TSUNEISHI KATSUYUKI ,  MIYAKI HIDEO ,  MATSUDA YASUO

    IPC: G02B6/00 ,  C03B37/027 ,  C03B37/029 ,  H05B3/14 ,  H05B3/44

    Abstract: There is provided an optical fiber drawing furnace capable of drawing an optical fiber (20) having small non-circularity, which drawing furnace includes a muffle tube (13), in which an optical fiber preform (15) is supplied, a heater (18) surrounding the muffle tube (13), a plurality of electrode connecting portion (22-25) extending from the heater (18), a plurality of electrodes (29, 30) connected to electrode connecting portions (22-25), and in conjunction therewith to an electric power source (33), and unifying means for unifying the temperature distribution along the circumferential direction. Also, there is provided an optical fiber drawing furnace capable of drawing an optical fiber (20) having small non-circularity, which drawing furnace includes an inner heater (41) surrounding a muffle tube (13), a pair of inner electrode connecting portions (43) extending from the inner heater (41), arranging in opposition to each other across the inner heater (41) and connecting to a power source (39) via a pair of electrodes (44), an outer heater (42) surrounding the inner heater (41), and a pair of outer electrode connecting portions (45) extended from the outer heater (42) and arranged in opposition to each other across the outer heater (42) in a direction perpendicular to opposing direction of the pair of inner electrode connecting portions (43), the outer electrode connecting portions (45) being connected to the power source (39) via a pair of electrodes (46).

    Resin coating applicator for an optical fiber
    98.
    发明专利
    Resin coating applicator for an optical fiber 未知

    公开(公告)号：AU5392998A

    公开(公告)日：1998-08-20

    申请号：AU5392998

    申请日：1998-02-13

    Applicant: SUMITOMO ELECTRIC INDUSTRIES

    Inventor： TSUCHIYA ICHIRO ,  OKUNO KAORU ,  MIYAKI HIDEO ,  OISHI KAZUMASA

    IPC: G02B6/44 ,  C03C25/12 ,  C03C25/18 ,  D06B1/08 ,  C03B37/083 ,  B05B1/24 ,  B05D1/00 ,  B05C9/00 ,  B05D7/20

    Abstract: In a resin coating applicator, a holder (14) is fixed on a base (15) fitted to a drawing machine, and in the holder (14), hot water can be circulated from an inlet (18). The inner circumferential surface of the holder (14) is formed into a tapered shape so that the outer circumferential surface of a cup-like member (14) of a cartridge type coating sub-assembly (1) is fitted to the holder (14). The respective outer circumferential surfaces of a nipple (2) and a coating die (3) are cylindrical so as to be fitted to the inner circumferential surfaces of an inner cylindrical member (6), and they are positioned by a step portion. Further, they are pressed from the upper and lower sides by the bottom portion of the cup-like member (4) and a lid member (5). The lid member (5) is fastened to the cup-like member (4) integrally by a thread.

    Method and apparatus for coating optical fiber
    99.
    发明专利
    Method and apparatus for coating optical fiber 未知

    公开(公告)号：AU7145696A

    公开(公告)日：1997-04-28

    申请号：AU7145696

    申请日：1996-10-04

    Applicant: SUMITOMO ELECTRIC INDUSTRIES

    Inventor： OKUNO KAORU ,  INOUE AKIRA ,  OISHI KAZUMASA ,  KOBAYASHI KOHEI ,  TSUCHIYA ICHIRO

    IPC: C03C25/18 ,  C03C25/02

    Abstract: PCT No. PCT/JP96/02889 Sec. 371 Date Jun. 6, 1997 Sec. 102(e) Date Jun. 6, 1997 PCT Filed Oct. 4, 1996 PCT Pub. No. WO97/12841 PCT Pub. Date Apr. 10, 1997The present invention relates to an optical fiber coating method and an apparatus therefor which can form high quality coating layer on an optical fiber (12) by preventing non-concentricity of a coating resin (14) applied on the optical fiber (12) and admixing of bubble. The optical fiber coating apparatus according to the present invention includes at least one pair of an illumination light introducing window (39) and an optical fiber monitoring window (40) formed facing each other with the resin pool between in a side wall portion of a die holder (17), opposing a resin pool (27), a light source (41) opposing to the illumination light introducing window (39) and projecting an illumination light toward the center portion of the resin pool (27), an image pick-up device (42) opposing the optical fiber monitoring window (40) for monitoring at least a contact portion between the optical fiber (12) and the coating resin (14) and in the vicinity thereof, and coating condition modifying means for modifying a coating condition of the coating resin (14) with respect to the optical fiber (12) on the basis of the result of observation of the image pick-up device (42).

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