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公开(公告)号：CA2116701C
公开(公告)日：2003-12-30
申请号：CA2116701
申请日：1994-03-01
Applicant: SUMITOMO ELECTRIC INDUSTRIES
Inventor： ITO MASUMI , DANZUKA TOSHIO , OHGA YUICHI , HOSHINO SUMIO , TSUCHIYA ICHIRO
IPC: C03B8/04 , C03B20/00 , C03B37/014 , G02B6/00 , C03B37/018 , G02B6/18
Abstract: The present invention relates to an improved process for providing the production of a glass preform for an optical fiber which includes substantially no bubbles therein and also which has a substantially uniform shape. The process for the production of a glass preform which comprises at least silica for an optical fiber is comprised of producing a body comprising a rod on which fine glass particles are deposited, preferably by a vapour phase reaction and heating the body to vitrify the body under a reduced atmosphere or a vacuum so that the glass preform is produced. The process includes a first heating step of degassing the body at a first heating temperature, a second heating step of shrinking the body at a second heating temperature which is higher than the first heating temperature and which is lower than a third heating temperature, and a third heating step of vitrifying the shrunken body at the third temperature which corresponds to a vitrification temperature of the fine glass particles so as to produce the glass preform.
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公开(公告)号：DE69328572T2
公开(公告)日：2001-01-04
申请号：DE69328572
申请日：1993-07-08
Applicant: SUMITOMO ELECTRIC INDUSTRIES
Inventor： HOSHINO SUMIO , DANZUKA TOSHIO , OHGA YUICHI , ITO MASUMI , MUKAI KATSUZO
IPC: C03B37/027 , C03B20/00 , C03B37/012 , C03B37/014 , C03B37/018 , G02B6/00
Abstract: An apparatus for drawing a glass preform for an optical fiber is disclosed.
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公开(公告)号：AU719606B2
公开(公告)日：2000-05-11
申请号：AU2863997
申请日：1997-07-09
Applicant: SUMITOMO ELECTRIC INDUSTRIES
Inventor： SASAOKA EISUKE , ITO MASUMI , NISHIMURA MASAYUKI
Abstract: The present invention relates to an optical fiber grating as an optical component comprising an optical fiber having a core and a cladding, and a grating photowritten in the optical fiber. In particular, in the optical fiber grating in accordance with the present invention, the optical fiber into which the grating periodically changing the refractive index in the waveguide along the advancing direction of light is photowritten has a depressed cladding type refractive index profile. Accordingly, when the configuration of the optical fiber having a depressed cladding type refractive index, employed as the object in which the grating is photowritten, is changed, the stability in characteristics as the optical component or the like can easily be improved.
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公开(公告)号：GB2307908B
公开(公告)日：1999-09-08
申请号：GB9625273
申请日：1996-12-04
Applicant: SUMITOMO ELECTRIC INDUSTRIES
Inventor： ISHIKAWA SHINJI , ITO MASUMI , HOSHINO SUMIO
IPC: C03B37/014
Abstract: In a soot-deposition container, raw material gas and at the tip of a starting glass rod, combustion gas, and carrier gas are supplied to a core-depositing burner and raw material gas, combustion gas, carrier gas, and gas for doping of fluorine are supplied to a cladding-depositing burner, thereby forming porous glass soot comprised of glass soot for core and glass soot for cladding. With growth of soot, the supply amount of the fluorine-doping gas is increased while supply amounts of the other gases are kept constant. Next, dehydration process and transparentizing process of soot are carried out to obtain a glass preform for optical fiber. Fabricated in this way is the glass preform for optical fiber having the silica glass portion doped with low-concentration fluorine with high uniformity in the growth direction.
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公开(公告)号：GB2307907B
公开(公告)日：1999-07-28
申请号：GB9625272
申请日：1996-12-04
Applicant: SUMITOMO ELECTRIC INDUSTRIES
Inventor： HOSHINO SUMIO , OHGA YUICHI , ITO MASUMI , DANZUKA TOSHIO , SAITO TATSUHIKO
IPC: C03B23/047 , C03B37/012 , C03B37/014 , C03B37/025 , C03B37/027 , C03B37/07
Abstract: The present invention relates to a method for precisely elongating a glass preform of an optical fiber body having a desired outer diameter. In this method, a predetermined part of the glass preform is elongated as tensile stress is applied to one end of the glass preform while a predetermined part of the glass preform is heated and softened successively from one end toward the other end of the glass preform. In this elongating operation, while the outer diameter of the softening portion of the glass preform is measured, the tensile stress is adjusted such that the outer diameter of the softening portion coincides with a preset value of the control outer diameter. In particular, this method is characterized in that the preset value of the control outer diameter is changed at least during a predetermined period until termination of elongation or during a predetermined period from the start of elongation.
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Patent Agency Ranking
公开(公告)号：DE69410704D1
公开(公告)日：1998-07-09
申请号：DE69410704
申请日：1994-06-17
Applicant: SUMITOMO ELECTRIC INDUSTRIES
Inventor： ITO MASUMI , HOSHINO SUMIO , DANZUKA TOSHIO
IPC: C03B37/014
Abstract: A method of manufacturing an optical fiber in which the deviation of a cutoff wavelength from a design value can be minimized. It is found that, upon diameter reduction of a porous core glass body by heat treatment, when the diameter reduction ratio is set to a value larger than 0.90, a "spike" in the refractive index distribution curve of a core can be prevented, and the deviation of the cutoff wavelength from the design value can be minimized. Therefore, there is provided a method comprising the first step of depositing fine SiO2 particles and fine GeO2 particles, which are produced by a core formation burner (31), to grow a porous core glass body (21) from a distal end of a rotating starting rod (16) in an axial direction, the second step of performing diameter reduction by heating the grown porous core glass body by heating means (33) while growing the porous core glass body, and the third step of depositing fine SiO2 particles produced by a cladding formation burner (32) to form a porous cladding glass layer on an outer surface of the diameter-reduced porous core glass body while performing growing and diameter reduction of the porous core glass body, wherein an outer diameter of the porous core glass body after the second step of performing diameter reduction is larger than 0.90 times an outer diameter before diameter reduction.
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公开(公告)号：DE69219677D1
公开(公告)日：1997-06-19
申请号：DE69219677
申请日：1992-06-24
Applicant: SUMITOMO ELECTRIC INDUSTRIES
Inventor： ITO MASUMI , HOSHINO SUMIO , ISHIKAWA SHINJI
IPC: C03B37/012 , C03B37/018 , C03C13/04 , C03B37/016
Abstract: A glass preform for an optical fiber containing a dopant in a core portion at a high concentration is produced by providing a glass tube, forming a coating film of a sol-gel solution containing a dopant compound on an inner wall of the glass tube, and vitrifying and collapsing the glass tube having the coating of the sol-gel solution while flowing a mixture of chlorine and oxygen through the glass tube to obtain a glass preform.
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公开(公告)号：AU7405496A
公开(公告)日：1997-06-12
申请号：AU7405496
申请日：1996-11-28
Applicant: SUMITOMO ELECTRIC INDUSTRIES
Inventor： HOSHINO SUMIO , OHGA YUICHI , ITO MASUMI , DANZUKA TOSHIO , SAITO TATSUHIKO
IPC: C03B23/047 , C03B37/012 , C03B37/014 , C03B37/025
Abstract: The present invention relates to a method for precisely elongating a glass preform of an optical fiber body having a desired outer diameter. In this method, a predetermined part of the glass preform is elongated as tensile stress is applied to one end of the glass preform while a predetermined part of the glass preform is heated and softened successively from one end toward the other end of the glass preform. In this elongating operation, while the outer diameter of the softening portion of the glass preform is measured, the tensile stress is adjusted such that the outer diameter of the softening portion coincides with a preset value of the control outer diameter. In particular, this method is characterized in that the preset value of the control outer diameter is changed at least during a predetermined period until termination of elongation or during a predetermined period from the start of elongation.
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公开(公告)号：GB2307908A
公开(公告)日：1997-06-11
申请号：GB9625273
申请日：1996-12-04
Applicant: SUMITOMO ELECTRIC INDUSTRIES
Inventor： ISHIKAWA SHINJI , ITO MASUMI , HOSHINO SUMIO
IPC: C03B37/014
Abstract: In a sinter-deposition container (400), raw material gas (SiC* litres *4 ), combustion gas (H 2 ,O 2 ) and a carrier gas are supplied to a core-depositing burner (510) and raw material gas (SiC* litres *4 ), combustion gas (H 2 ,O 2 ) carrier gas, and gas (CF 4 ) for doping of fluorine are supplied to a cladding-depositing burner (520), thereby forming porous glass sinter comprised of glass sinter (100) for the core and glass sinter (200) for the cladding. With growth of sinter, the supplied amount of the fluorine-doping gas (CF 4 ) is increased while supplied amounts of the other gases are kept constant. Next, a dehydration or consolidation process and transparentizing process are carried out on the sintered body to obtain a glass preform for an optical fibre. Fabricated in this way a glass preform for an optical fibre has its cladding portion doped with a low-concentration of fluorine with a high uniformity in the growth direction.
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公开(公告)号：AU7183196A
公开(公告)日：1997-05-29
申请号：AU7183196
申请日：1996-11-19
Inventor： INOUE AKIRA , IWASHIMA TORU , ITO MASUMI , MIYAJIMA YOSHIAKI , FURUKAWA SHIN-ICHI
Abstract: The optical connector according to the present invention comprises, at least, an optical filter (12) with a waveguide structure (11) having a grating (126) with a predetermined reflection wavelength and a plug attached to a tip (121) of the optical filter (12). The grating is disposed at a tip portion (121) of the optical filter (12) and accommodated in the plug attached to the tip portion of the optical filter (12). Further, the optical connector has various light-blocking structures for preventing unnecessary light from traveling a filter region (122) of the optical filter (12) including the grating.
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