NL190841C - Werkwijze voor de vervaardiging van voorvormen voor optische vezels uit gedoteerd kwartsglas. - Google Patents

Werkwijze voor de vervaardiging van voorvormen voor optische vezels uit gedoteerd kwartsglas.

Info

Publication number
NL190841C
NL190841C NL8104196A NL8104196A NL190841C NL 190841 C NL190841 C NL 190841C NL 8104196 A NL8104196 A NL 8104196A NL 8104196 A NL8104196 A NL 8104196A NL 190841 C NL190841 C NL 190841C
Authority
NL
Netherlands
Prior art keywords
optical fiber
quartz glass
manufacturing optical
doped quartz
fiber preforms
Prior art date
Application number
NL8104196A
Other languages
English (en)
Other versions
NL8104196A (nl
NL190841B (nl
Original Assignee
Nippon Telegraph & Telephone
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP12655680A external-priority patent/JPS5751144A/ja
Priority claimed from JP12710280A external-priority patent/JPS5756335A/ja
Priority claimed from JP15496180A external-priority patent/JPS5782132A/ja
Priority claimed from JP15496080A external-priority patent/JPS5782131A/ja
Priority claimed from JP16626280A external-priority patent/JPS5792530A/ja
Priority claimed from JP5433481A external-priority patent/JPS5934661B2/ja
Priority claimed from JP5433281A external-priority patent/JPS57170832A/ja
Application filed by Nippon Telegraph & Telephone filed Critical Nippon Telegraph & Telephone
Publication of NL8104196A publication Critical patent/NL8104196A/nl
Publication of NL190841B publication Critical patent/NL190841B/nl
Application granted granted Critical
Publication of NL190841C publication Critical patent/NL190841C/nl

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B19/00—Other methods of shaping glass
    • C03B19/10—Forming beads
    • C03B19/1005—Forming solid beads
    • C03B19/106—Forming solid beads by chemical vapour deposition; by liquid phase reaction
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B19/00—Other methods of shaping glass
    • C03B19/10—Forming beads
    • C03B19/1005—Forming solid beads
    • C03B19/102—Forming solid beads by blowing a gas onto a stream of molten glass or onto particulate materials, e.g. pulverising
    • 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]
    • C03B37/01413—Reactant delivery systems
    • 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]
    • C03B37/01413—Reactant delivery systems
    • C03B37/0142—Reactant deposition burners
    • 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
    • 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
    • C03C13/04—Fibre optics, e.g. core and clad fibre compositions
    • C03C13/045—Silica-containing oxide glass compositions
    • 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
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/06—Glass compositions containing silica with more than 90% silica by weight, e.g. quartz
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2203/00—Fibre product details, e.g. structure, shape
    • C03B2203/10—Internal structure or shape details
    • C03B2203/22—Radial profile of refractive index, composition or softening point
    • C03B2203/24—Single mode [SM or monomode]
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2203/00—Fibre product details, e.g. structure, shape
    • C03B2203/10—Internal structure or shape details
    • C03B2203/22—Radial profile of refractive index, composition or softening point
    • C03B2203/26—Parabolic or graded index [GRIN] core profile
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2207/00—Glass deposition burners
    • C03B2207/04—Multi-nested ports
    • C03B2207/06—Concentric circular ports
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2207/00—Glass deposition burners
    • C03B2207/20—Specific substances in specified ports, e.g. all gas flows specified
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2207/00—Glass deposition burners
    • C03B2207/20—Specific substances in specified ports, e.g. all gas flows specified
    • C03B2207/26—Multiple ports for glass precursor
    • C03B2207/28—Multiple ports for glass precursor for different glass precursors, reactants or modifiers
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2207/00—Glass deposition burners
    • C03B2207/50—Multiple burner arrangements
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2207/00—Glass deposition burners
    • C03B2207/60—Relationship between burner and deposit, e.g. position
    • C03B2207/64—Angle
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2207/00—Glass deposition burners
    • C03B2207/80—Feeding the burner or the burner-heated deposition site
    • C03B2207/85—Feeding the burner or the burner-heated deposition site with vapour generated from liquid glass precursors, e.g. directly by heating the liquid
    • C03B2207/87—Controlling the temperature
    • 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
    • C03C2201/00—Glass compositions
    • C03C2201/06—Doped silica-based glasses
    • C03C2201/30—Doped silica-based glasses containing metals
    • 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
    • C03C2201/00—Glass compositions
    • C03C2201/06—Doped silica-based glasses
    • C03C2201/30—Doped silica-based glasses containing metals
    • C03C2201/40—Doped silica-based glasses containing metals containing transition metals other than rare earth metals, e.g. Zr, Nb, Ta or Zn
    • 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
    • C03C2203/00—Production processes
    • C03C2203/40—Gas-phase processes

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)
  • Glass Melting And Manufacturing (AREA)
  • Glass Compositions (AREA)
NL8104196A 1980-09-11 1981-09-10 Werkwijze voor de vervaardiging van voorvormen voor optische vezels uit gedoteerd kwartsglas. NL190841C (nl)

Applications Claiming Priority (14)

Application Number Priority Date Filing Date Title
JP12655680A JPS5751144A (en) 1980-09-11 1980-09-11 Preparation of doped silica glas
JP12655680 1980-09-11
JP12710280A JPS5756335A (en) 1980-09-16 1980-09-16 Manufacture of doped silica glass
JP12710280 1980-09-16
JP15496180 1980-11-04
JP15496080 1980-11-04
JP15496180A JPS5782132A (en) 1980-11-04 1980-11-04 Preparation of doped silica glass
JP15496080A JPS5782131A (en) 1980-11-04 1980-11-04 Preparation of doped silica glass
JP16626280 1980-11-26
JP16626280A JPS5792530A (en) 1980-11-26 1980-11-26 Preparation of doped silica glass
JP5433481 1981-04-13
JP5433281 1981-04-13
JP5433481A JPS5934661B2 (ja) 1981-04-13 1981-04-13 ド−プトシリカガラスの製造方法
JP5433281A JPS57170832A (en) 1981-04-13 1981-04-13 Manufacture of base material for optical fiber

Publications (3)

Publication Number Publication Date
NL8104196A NL8104196A (nl) 1982-04-01
NL190841B NL190841B (nl) 1994-04-18
NL190841C true NL190841C (nl) 1994-09-16

Family

ID=27564845

Family Applications (1)

Application Number Title Priority Date Filing Date
NL8104196A NL190841C (nl) 1980-09-11 1981-09-10 Werkwijze voor de vervaardiging van voorvormen voor optische vezels uit gedoteerd kwartsglas.

Country Status (6)

Country Link
US (1) US4414012A (nl)
CA (1) CA1188895A (nl)
FR (1) FR2489808B1 (nl)
GB (1) GB2083806B (nl)
IT (1) IT1139603B (nl)
NL (1) NL190841C (nl)

Families Citing this family (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4474593A (en) * 1982-04-26 1984-10-02 At&T Technologies Inc. Method of fabricating a lightguide fiber
DE3217965A1 (de) * 1982-05-13 1983-11-17 Standard Elektrik Lorenz Ag, 7000 Stuttgart Verfahren zur herstellung von glasfaser-lichtwellenleitern
US4443239A (en) * 1982-05-20 1984-04-17 International Telephone And Telegraph Corporation Fabrication of optical waveguides using slurry deposition
CA1218270A (en) * 1982-07-26 1987-02-24 Herman M. Presby Method of fabricating optical fiber preforms
DE3240355C1 (de) * 1982-11-02 1983-11-17 Heraeus Quarzschmelze Gmbh, 6450 Hanau Verfahren zur Herstellung eines laenglichen Glaskoerpers mit inhomogener Brechungsindexverteilung
DE3302745A1 (de) * 1983-01-27 1984-08-02 Wacker-Chemitronic Gesellschaft für Elektronik-Grundstoffe mbH, 8263 Burghausen Verfahren zur herstellung von gegenstaenden aus hochreinem synthetischem quarzglas
DE3304552A1 (de) * 1983-02-10 1984-08-16 Standard Elektrik Lorenz Ag, 7000 Stuttgart Verfahren zur herstellung von lichtwellenleitern
DE3304721A1 (de) * 1983-02-11 1984-08-16 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Verfahren zur herstellung einer vorform fuer lichtwellenleiter
DE3327484A1 (de) * 1983-07-29 1985-02-14 Siemens AG, 1000 Berlin und 8000 München Verfahren zur herstellung von glas durch abscheidung aus der gasphase
US4563276A (en) * 1983-12-16 1986-01-07 At&T Bell Laboratories Chromatographic apparatus and process
DE3474657D1 (en) * 1984-01-31 1988-11-24 Nippon Telegraph & Telephone Method of fabricating optical fiber preforms
EP0360479B1 (en) * 1988-09-21 1992-02-26 AT&T Corp. Method of producing a glass body
US5043002A (en) * 1990-08-16 1991-08-27 Corning Incorporated Method of making fused silica by decomposing siloxanes
US5151117A (en) * 1991-06-14 1992-09-29 Corning Incorporated Solution doping of porous preforms
JP2588447B2 (ja) * 1991-06-29 1997-03-05 信越石英株式会社 エキシマレーザー用石英ガラス部材の製造方法
DE19648025A1 (de) * 1996-11-20 1998-05-28 Deutsche Telekom Ag Immersionsflüssigkeiten und -gele für optische Stecker und mechanische Spleiße von Lichtwellenleitern sowie Verfahren zu deren Herstellung
US6535679B2 (en) * 1997-01-16 2003-03-18 Sumitomo Electric Industries, Ltd. Optical fiber and method of manufacturing the same
FR2762836B1 (fr) * 1997-05-02 1999-07-23 Alsthom Cge Alcatel Procede et appareil de fabrication de preformes de fibre de verre
AU741032B2 (en) * 1997-07-15 2001-11-22 Corning Incorporated Decreased h2 sensitivity in optical fiber
US6044664A (en) * 1997-09-29 2000-04-04 Nikon Corporation Synthetic silica glass manufacturing apparatus
US7280219B1 (en) 1997-10-28 2007-10-09 Rockwell Automation Technologies, Inc. System for monitoring sealing wear
US6111643A (en) * 1997-10-28 2000-08-29 Reliance Electric Industrial Company Apparatus, system and method for determining wear of an article
US6580511B1 (en) * 1997-10-28 2003-06-17 Reliance Electric Technologies, Llc System for monitoring sealing wear
DE19937861C2 (de) * 1999-08-13 2003-03-20 Heraeus Quarzglas Verfahren für die Herstellung dichter Quarzglas-Körnung
EP1218300A1 (en) * 1999-09-03 2002-07-03 Bular, LLC Apparatus for making a glass preform by flame hydrolysis
US6386373B1 (en) * 2000-03-10 2002-05-14 Alcatel Process for making silica powder and use of such powder in the manufacture of an optical fiber preform
EP1195360A1 (de) * 2000-09-01 2002-04-10 Degussa AG Verfahren zur Herstellung von SiO2-TiO2-Gläsern mit geringem thermischen Ausdehnungskoeffizient
EP1184350B1 (de) * 2000-09-01 2006-05-17 Degussa AG Verfahren zur Herstellung von SiO2-TiO2-Gläsern mit geringem thermischen Ausdehnungskoeffizient
US20030104209A1 (en) * 2001-11-30 2003-06-05 Bellman Robert A. Precursor and method of growing doped glass films
US20030226377A1 (en) * 2002-03-05 2003-12-11 Barrett W. Tim Method of making silica-titania extreme ultraviolet elements
JP2003335541A (ja) * 2002-03-13 2003-11-25 Fujikura Ltd 多孔質母材の製造方法
JP2004284886A (ja) * 2003-03-24 2004-10-14 Shin Etsu Chem Co Ltd 合成石英ガラス製造用バーナー
US20110100061A1 (en) * 2009-10-30 2011-05-05 James Fleming Formation of microstructured fiber preforms using porous glass deposition
JP5476982B2 (ja) * 2009-12-25 2014-04-23 信越化学工業株式会社 チタニアドープ石英ガラスの選定方法
DE102012000418A1 (de) 2011-12-23 2013-06-27 J-Plasma Gmbh Verfahren zum Herstellen von Stablinsen und Vorrichtung hierfür
DE102012100233B4 (de) * 2012-01-12 2014-05-15 Schott Ag Hochtransmittive Gläser mit hoher Solarisationsbeständigkeit, ihre Verwendung und Verfahren zu ihrer Herstellung
JP6006185B2 (ja) * 2012-09-24 2016-10-12 信越化学工業株式会社 光ファイバ用多孔質ガラス堆積体の製造方法
CN103224240B (zh) * 2013-04-15 2015-03-04 清华大学 一种四氯化硅气相水解合成纳米级二氧化硅的方法
DE102014111781B4 (de) * 2013-08-19 2022-08-11 Korea Atomic Energy Research Institute Verfahren zur elektrochemischen Herstellung einer Silizium-Schicht
WO2017078859A1 (en) * 2015-11-04 2017-05-11 Unimin Corporation Purified quartz powder modified for cladding optic fiber cable
CN105837025B (zh) * 2016-04-21 2018-12-11 烽火通信科技股份有限公司 高效制备掺杂光纤预制棒的方法及掺杂光纤预制棒
US10745804B2 (en) * 2017-01-31 2020-08-18 Ofs Fitel, Llc Parallel slit torch for making optical fiber preform
CN116217067B (zh) * 2023-02-17 2023-12-19 长飞光纤光缆股份有限公司 一种石英玻璃圆柱体的沉积系统及方法

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3859073A (en) * 1973-10-19 1975-01-07 Corning Glass Works Method of producing glass by flame hydrolysis
US3864113A (en) * 1973-10-19 1975-02-04 Corning Glass Works Method of Producing Glass by Flame Hydrolysis
US4217027A (en) * 1974-02-22 1980-08-12 Bell Telephone Laboratories, Incorporated Optical fiber fabrication and resulting product
DE2546162B1 (de) * 1975-10-15 1976-09-23 Jenaer Glaswerk Schott & Gen Lichtleitfaser mit Brechungsindexgradient zur Nachrichtenuebertragung
JPS52121341A (en) * 1976-04-06 1977-10-12 Nippon Telegr & Teleph Corp <Ntt> Production of optical fiber base materials and production apparatus fo r the same
JPS54103058A (en) * 1978-01-31 1979-08-14 Nippon Telegr & Teleph Corp <Ntt> Production of anhydride glass material for optical fibers
US4263031A (en) * 1978-06-12 1981-04-21 Corning Glass Works Method of producing glass optical filaments
FR2446264A1 (fr) * 1979-01-10 1980-08-08 Quartz & Silice Procede de preparation d'une preforme pour guide d'onde optique
JPS55144430A (en) * 1979-04-24 1980-11-11 Nippon Telegr & Teleph Corp <Ntt> Manufacture of base material for light transmission fiber
JPS55144429A (en) * 1979-04-24 1980-11-11 Nippon Telegr & Teleph Corp <Ntt> Quartz glass for light transmission fiber and its manufacture
US4345928A (en) * 1979-10-09 1982-08-24 Nippon Telegraph & Telephone Public Corporation Fabrication method of single-mode optical fiber preforms

Also Published As

Publication number Publication date
FR2489808B1 (nl) 1985-01-11
FR2489808A1 (nl) 1982-03-12
GB2083806B (en) 1984-08-08
NL8104196A (nl) 1982-04-01
GB2083806A (en) 1982-03-31
IT1139603B (it) 1986-09-24
US4414012A (en) 1983-11-08
IT8123880A0 (it) 1981-09-10
CA1188895A (en) 1985-06-18
NL190841B (nl) 1994-04-18

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