WO2006075448A1 - 光ファイバ母材及びその製造方法 - Google Patents
光ファイバ母材及びその製造方法 Download PDFInfo
- Publication number
- WO2006075448A1 WO2006075448A1 PCT/JP2005/021232 JP2005021232W WO2006075448A1 WO 2006075448 A1 WO2006075448 A1 WO 2006075448A1 JP 2005021232 W JP2005021232 W JP 2005021232W WO 2006075448 A1 WO2006075448 A1 WO 2006075448A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- optical fiber
- fiber preform
- target
- rod
- dummy
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C13/00—Fibre or filament compositions
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
- C03B37/01486—Means for supporting, rotating or translating the preforms being formed, e.g. lathes
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2201/00—Type of glass produced
- C03B2201/06—Doped silica-based glasses
- C03B2201/08—Doped silica-based glasses doped with boron or fluorine or other refractive index decreasing dopant
- C03B2201/12—Doped silica-based glasses doped with boron or fluorine or other refractive index decreasing dopant doped with fluorine
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
Definitions
- the present invention relates to an optical fiber preform and a method for manufacturing the same. More specifically, the present invention relates to an optical fiber preform formed by depositing glass fine particles on a quartz glass rod to form a porous preform and forming a transparent glass, and a method for producing the same.
- a soot is produced by causing a relative reciprocating motion of a parner or a starting member along a rotating starting member, and depositing and depositing glass particles generated in the Parna flame on the starting member.
- an external method in which this is dewatered and sintered in an electric furnace to form a transparent glass (OVD method) is widely used because it can mass-produce large-diameter optical fiber preforms.
- a starting member for depositing soot a member in which a dummy rod (support member) is connected to both ends of a quartz glass rod (hereinafter referred to as a target) serving as a core is used.
- the synthesized soot 1 is suspended from the gripping mechanism 2 via the dummy rod 3 and passed through the heating zone of the heater 4 using, for example, a device as shown in FIG. As a result, sintering and transparent vitrification are performed.
- Reference numeral 5 denotes a target.
- soot Since soot has a low bulk density, it shrinks greatly in the radial and axial directions during sintering and transparent vitrification. The ends of the soot are conical and shrink during the synthesis and subsequent sintering.
- optical fiber preforms manufactured by various methods have been adjusted in refractive index distribution by adding various dopants.
- germanium or fluorine can be used as a dopant.
- the optical fiber preform used for the production of fluorine-doped fiber contains fluorine. Sintering and transparent vitrification are performed in a gas atmosphere, and the cladding layer is doped with fluorine. Fluorine doping must be performed uniformly in the cladding layer. If the soot has a high bulk density, it will be difficult to perform the doping uniformly.
- the bulk density is preferably 0.5 g / cm 3 or less.
- the soot contracts at the interface with the target, that is, an axial misalignment occurs, and the interface between the soot and the target immediately forms a spiral and streak along the axial direction. Bubbles (hereinafter, simply referred to as spiral bubbles) are likely to occur.
- Patent Document 1 discloses: (a) a dummy rod 3 provided with a convex portion 6, (b) a dummy rod 3 provided with a concave portion 7, and (c) a diameter of the dummy rod 3 (D)
- a dummy rod 3 provided with a convex portion 6
- a dummy rod 3 provided with a concave portion 7
- a diameter of the dummy rod 3 D
- Patent Document 1 JP-A-6-48757
- the concave / convex machining on the dummy rod 3 of (a) and (b) above adds a machining cost and increases the cost.
- (C) The method of providing a diameter difference between the dummy rod 3 and the target 5 has a small effect of suppressing axial contraction if the diameter difference is small, and suppresses the generation of spiral bubbles generated at the interface with the target 5. The effect to do is small.
- the diameter difference is large, defective products occur frequently when the soot density is low during deposition, but it is effective in suppressing the generation of spiral bubbles.
- the present invention has been made in view of the above problems, and an object of the present invention is to provide a fiber preform that suppresses the generation of spiral bubbles due to axial misalignment at the interface and a method for manufacturing the same. .
- a dummy rod is connected to the end of a target formed by a quartz glass rod as an optical fiber preform by depositing glass particles.
- a connecting step for forming a rod a processing step for processing a dummy rod to form a taper portion where the diameter of the dummy rod becomes thinner as the distance from the target is reduced, and a dummy after the processing step
- an optical fiber preform manufacturing method including a deposition process in which glass fine particles are deposited so as to cover the large diameter side of the tapered portion at the outer peripheral portion of the attached glass rod.
- the inclination angle of the tapered portion is preferably 2 to 50 °.
- the glass fine particles contract in a state where they are anchored to the tapered portion, so that the occurrence of axial deviation is suppressed.
- the taper angle of the taper portion exceeds ⁇ force 0 ° because cracks are likely to occur in the soot.
- the taper angle ⁇ is less than 2 °, no significant effect can be obtained.
- the length of the tapered portion is preferably 3 to 50 mm.
- the said effect can be exhibited effectively, without causing the raise of manufacturing cost.
- the length of the taper portion exceeds 50 mm, the amount of processing necessary to form an effective taper angle increases, resulting in a decrease in productivity.
- the length of the tapered portion was shorter than 3 mm, no significant effect was exhibited.
- the effective portion that becomes the target product becomes relatively short, which increases the cost.
- the bulk density of the soot is 0.
- the optical fiber preform can be a fluorine-doped optical fiber preform.
- an optical fiber having a low refractive index and a high radiation resistance can be manufactured.
- an optical fiber preform manufactured by the above manufacturing method.
- an optical fiber can be manufactured with a high yield by using an inexpensive and high-quality optical fiber preform.
- this optical fiber preform can dope the additive material uniformly, the productivity of optical fibers having excellent optical characteristics is improved.
- the optical fiber preform can be a fluorine-doped optical fiber preform.
- an optical fiber having a low refractive index and a high radiation resistance can be manufactured.
- the above configuration can suppress the generation of spiral bubbles at the interface with the target, and can greatly contribute to the reduction of the manufacturing cost.
- An excellent effect is obtained, such as obtaining an optical fiber preform.
- FIG. 1 is a schematic explanatory view showing an outline of an apparatus for converting soot into transparent glass.
- FIG. 2 is a schematic diagram illustrating the shape of a dummy rod or target according to the prior art.
- FIG. 3 is a graph showing a preferred shape of the tapered portion.
- FIG. 4 is a schematic view illustrating the shape of a tapered portion according to the present invention.
- the present invention defines the shape of the end portion of the dummy rod connected to the target, thereby providing a tag. Specifically, the generation of spiral bubbles at the interface with one get is suppressed. Specifically, the diameter of the dummy rod on the chucking side when making transparent glass is made smaller than the target diameter, and the dummy rod and the target A tapered portion is formed at the connecting portion to the substrate, and glass fine particles are deposited on the target so as to cover the tapered portion, thereby forming a soot.
- each target with a diameter of 40, 30, and 20 mm and a dummy rod with a diameter of 16 mm are prepared, one end of the target is tapered, and the length of the tapered portion is in the range of 1 to LOOmm.
- the inclination angle (taper angle) was varied in the range of 1 to 85 °.
- the processed target was welded to the dummy rod on the tapered portion side, and soot was deposited on the target so as to cover the tapered portion.
- the misalignment at the interface was examined by the presence or absence of spiral bubbles. As a result, no axis deviation was observed in the area surrounded by the broken line shown in FIG.
- the bulk density of the soot obtained was in the range of 0.21 to 0.25 g / cm 3 and varied among lots, but this was due to the difference in target diameter.
- the taper angle ⁇ of the target 5 exceeds the taper angle ⁇ force of 0 °, and the effect is not obtained if the soot cracks immediately or less than 2 °. It was set to ⁇ 50 ° (see Figure 4).
- soot deposition is not performed so as to cover the tapered portion! /, And the effect of preventing the shaft misalignment is reduced. Therefore, it is necessary to deposit soot so as to cover the entire tapered portion.
- the length c of the tapered portion 10 exceeds 50 mm, it takes time for processing, and a desired effect cannot be obtained and an unnecessary portion becomes longer. Furthermore, when the target side is formed by processing, the effective portion that becomes the target product is relatively shortened and the cost is increased. For this reason, the length c of the tapered portion 10 is set to 3 to 50 mm.
- the soot density is preferably low.
- low-density soot is weak in soot baking to the target, and during sintering, shrinkage in the longitudinal direction becomes dominant and misalignment tends to occur.
- the present invention enables uniform fluorine doping by setting the soot bulk density to 0.5 g / cm 3 or less, and the dummy rod connected to the target has a taper angle of 2 to 50 degrees.
- the shrinkage in the longitudinal direction is suppressed to prevent axial misalignment and the generation of spiral bubbles is suppressed. Is.
- a target with a diameter of 20 mm and a dummy rod with a diameter of 16 mm were prepared.
- one end of the target was processed to form several types of tapered portions having different shape specifications.
- the target was welded to the dummy rod on the taper portion side, and then the deposition process was performed to provide the optical fiber preforms of Examples 1 to 5 and Comparative Examples 1 and 2.
- the soot deposition conditions on the target were the same, and the glass fine particles were deposited so as to cover the tapered portion. Next, it was made into a transparent glass in a fluorine mixed gas atmosphere.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05807087A EP1847514A4 (en) | 2005-01-13 | 2005-11-18 | LIGHT FIBER BASIC MATERIAL AND MANUFACTURING METHOD THEREFOR |
CN2005800490743A CN101142146B (zh) | 2005-01-13 | 2005-11-18 | 光纤母材及其制造方法 |
US11/826,218 US20080176091A1 (en) | 2005-01-13 | 2007-07-13 | Optical fiber base material and manufacturing method therefore |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005006421A JP2006193370A (ja) | 2005-01-13 | 2005-01-13 | 光ファイバ母材及びその製造方法 |
JP2005-006421 | 2006-01-13 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/826,218 Continuation US20080176091A1 (en) | 2005-01-13 | 2007-07-13 | Optical fiber base material and manufacturing method therefore |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006075448A1 true WO2006075448A1 (ja) | 2006-07-20 |
Family
ID=36677481
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/021232 WO2006075448A1 (ja) | 2005-01-13 | 2005-11-18 | 光ファイバ母材及びその製造方法 |
Country Status (7)
Country | Link |
---|---|
US (1) | US20080176091A1 (ja) |
EP (1) | EP1847514A4 (ja) |
JP (1) | JP2006193370A (ja) |
KR (1) | KR20070094656A (ja) |
CN (1) | CN101142146B (ja) |
TW (1) | TW200628416A (ja) |
WO (1) | WO2006075448A1 (ja) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5380018B2 (ja) * | 2008-09-03 | 2014-01-08 | 株式会社フジクラ | 光ファイバ母材の製造方法 |
CN113072290B (zh) * | 2021-04-01 | 2022-05-06 | 长飞光纤光缆股份有限公司 | 一种纯石英玻璃中空圆柱体的制造方法 |
JP7250850B2 (ja) * | 2021-07-01 | 2023-04-03 | 信越化学工業株式会社 | 光ファイバ用ガラス母材、及び光ファイバ用ガラス母材の製造方法 |
KR102419565B1 (ko) * | 2021-12-23 | 2022-07-11 | 비씨엔씨 주식회사 | 반도체용 실린더형 합성 쿼츠 제조기술 |
KR102419537B1 (ko) * | 2021-12-23 | 2022-07-11 | 비씨엔씨 주식회사 | 사이드 버너를 이용한 실린더형 합성 쿼츠 제조방법 |
KR102419554B1 (ko) * | 2021-12-23 | 2022-07-11 | 비씨엔씨 주식회사 | 반도체용 실린더형 합성 쿼츠 제조를 위한 맨드릴 구성 및 제조방법 |
KR102419547B1 (ko) * | 2021-12-23 | 2022-07-11 | 비씨엔씨 주식회사 | 반도체용 실린더형 합성 쿼츠 제조를 위한 맨드릴 구성 |
KR102452282B1 (ko) * | 2021-12-23 | 2022-10-06 | 비씨엔씨 주식회사 | 맨드릴 형상 변경을 통한 반도체용 실린더형 합성 쿼츠 제조방법 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08188436A (ja) * | 1994-12-29 | 1996-07-23 | Fujikura Ltd | 光ファイバ母材の製造方法 |
JP2001335339A (ja) * | 2000-05-24 | 2001-12-04 | Sumitomo Electric Ind Ltd | 光ファイバ母材の製造方法 |
JP2001335338A (ja) * | 2000-05-26 | 2001-12-04 | Sumitomo Electric Ind Ltd | 光ファイバの製造方法 |
JP2003146687A (ja) * | 2001-11-13 | 2003-05-21 | Furukawa Electric Co Ltd:The | 光ファイバ母材の製造方法 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4586943A (en) * | 1983-10-20 | 1986-05-06 | Sumitomo Electric Industries, Ltd. | Method for the production of glass preform for optical fibers |
JPS63159233A (ja) * | 1986-12-23 | 1988-07-02 | Hitachi Cable Ltd | 光フアイバ母材製造用出発材 |
JP2004115301A (ja) * | 2002-09-25 | 2004-04-15 | Sumitomo Electric Ind Ltd | 光ファイバ用ガラス母材の製造方法 |
-
2005
- 2005-01-13 JP JP2005006421A patent/JP2006193370A/ja active Pending
- 2005-11-18 CN CN2005800490743A patent/CN101142146B/zh active Active
- 2005-11-18 WO PCT/JP2005/021232 patent/WO2006075448A1/ja active Application Filing
- 2005-11-18 EP EP05807087A patent/EP1847514A4/en not_active Withdrawn
- 2005-11-18 KR KR1020077018308A patent/KR20070094656A/ko not_active Application Discontinuation
- 2005-11-29 TW TW094141849A patent/TW200628416A/zh unknown
-
2007
- 2007-07-13 US US11/826,218 patent/US20080176091A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08188436A (ja) * | 1994-12-29 | 1996-07-23 | Fujikura Ltd | 光ファイバ母材の製造方法 |
JP2001335339A (ja) * | 2000-05-24 | 2001-12-04 | Sumitomo Electric Ind Ltd | 光ファイバ母材の製造方法 |
JP2001335338A (ja) * | 2000-05-26 | 2001-12-04 | Sumitomo Electric Ind Ltd | 光ファイバの製造方法 |
JP2003146687A (ja) * | 2001-11-13 | 2003-05-21 | Furukawa Electric Co Ltd:The | 光ファイバ母材の製造方法 |
Non-Patent Citations (1)
Title |
---|
See also references of EP1847514A4 * |
Also Published As
Publication number | Publication date |
---|---|
TW200628416A (en) | 2006-08-16 |
EP1847514A1 (en) | 2007-10-24 |
US20080176091A1 (en) | 2008-07-24 |
CN101142146B (zh) | 2011-04-13 |
KR20070094656A (ko) | 2007-09-20 |
CN101142146A (zh) | 2008-03-12 |
EP1847514A4 (en) | 2011-07-06 |
JP2006193370A (ja) | 2006-07-27 |
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