ATE214037T1 - Verfahren zur herstellung einer grossen vorform für einzelmode fasern - Google Patents

Verfahren zur herstellung einer grossen vorform für einzelmode fasern

Info

Publication number
ATE214037T1
ATE214037T1 AT99305360T AT99305360T ATE214037T1 AT E214037 T1 ATE214037 T1 AT E214037T1 AT 99305360 T AT99305360 T AT 99305360T AT 99305360 T AT99305360 T AT 99305360T AT E214037 T1 ATE214037 T1 AT E214037T1
Authority
AT
Austria
Prior art keywords
tube
preform
less
diameter
core
Prior art date
Application number
AT99305360T
Other languages
English (en)
Inventor
Paul Francis Glodis
Charles Francis Gridley
Donald Paul Jablonowski
David Kalish
Kenneth Lee Walker
Original Assignee
Lucent Technologies Inc
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
Application filed by Lucent Technologies Inc filed Critical Lucent Technologies Inc
Application granted granted Critical
Publication of ATE214037T1 publication Critical patent/ATE214037T1/de

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03CCHEMICAL 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
    • C03C3/00Glass compositions
    • C03C3/04Glass compositions containing silica
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01Manufacture of glass fibres or filaments
    • C03B37/012Manufacture of preforms for drawing fibres or filaments
    • C03B37/01205Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
    • C03B37/01211Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments by inserting one or more rods or tubes into a tube
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01Manufacture of glass fibres or filaments
    • C03B37/012Manufacture of preforms for drawing fibres or filaments
    • C03B37/014Manufacture 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]
    • C03B37/018Manufacture 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] by glass deposition on a glass substrate, e.g. by inside-, modified-, plasma-, or plasma modified- chemical vapour deposition [ICVD, MCVD, PCVD, PMCVD], i.e. by thin layer coating on the inside or outside of a glass tube or on a glass rod
    • C03B37/01861Means for changing or stabilising the diameter or form of tubes or rods
    • C03B37/01869Collapsing
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01Manufacture of glass fibres or filaments
    • C03B37/012Manufacture of preforms for drawing fibres or filaments
    • C03B37/014Manufacture 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]
    • C03B37/018Manufacture 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] by glass deposition on a glass substrate, e.g. by inside-, modified-, plasma-, or plasma modified- chemical vapour deposition [ICVD, MCVD, PCVD, PMCVD], i.e. by thin layer coating on the inside or outside of a glass tube or on a glass rod
    • C03B37/01884Means for supporting, rotating and translating tubes or rods being formed, e.g. lathes
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01Manufacture of glass fibres or filaments
    • C03B37/012Manufacture of preforms for drawing fibres or filaments
    • C03B37/014Manufacture 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]
    • C03B37/018Manufacture 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] by glass deposition on a glass substrate, e.g. by inside-, modified-, plasma-, or plasma modified- chemical vapour deposition [ICVD, MCVD, PCVD, PMCVD], i.e. by thin layer coating on the inside or outside of a glass tube or on a glass rod
    • C03B37/01884Means for supporting, rotating and translating tubes or rods being formed, e.g. lathes
    • C03B37/01892Deposition substrates, e.g. tubes, mandrels
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2201/00Type of glass produced
    • C03B2201/02Pure silica glass, e.g. pure fused quartz
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2201/00Type of glass produced
    • C03B2201/02Pure silica glass, e.g. pure fused quartz
    • C03B2201/03Impurity concentration specified
    • C03B2201/04Hydroxyl ion (OH)
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2201/00Type of glass produced
    • C03B2201/06Doped silica-based glasses
    • C03B2201/07Impurity concentration specified
    • C03B2201/075Hydroxyl ion (OH)
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2203/00Fibre product details, e.g. structure, shape
    • C03B2203/10Internal structure or shape details
    • C03B2203/22Radial profile of refractive index, composition or softening point
    • C03B2203/24Single mode [SM or monomode]

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)
  • Inorganic Fibers (AREA)
AT99305360T 1998-07-14 1999-07-06 Verfahren zur herstellung einer grossen vorform für einzelmode fasern ATE214037T1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US09/115,783 US6105396A (en) 1998-07-14 1998-07-14 Method of making a large MCVD single mode fiber preform by varying internal pressure to control preform straightness

Publications (1)

Publication Number Publication Date
ATE214037T1 true ATE214037T1 (de) 2002-03-15

Family

ID=22363362

Family Applications (1)

Application Number Title Priority Date Filing Date
AT99305360T ATE214037T1 (de) 1998-07-14 1999-07-06 Verfahren zur herstellung einer grossen vorform für einzelmode fasern

Country Status (8)

Country Link
US (1) US6105396A (de)
EP (1) EP0972752B1 (de)
KR (1) KR100327463B1 (de)
CN (1) CN1101344C (de)
AT (1) ATE214037T1 (de)
BR (1) BR9902718A (de)
DE (1) DE69900958T2 (de)
TW (1) TW476738B (de)

Families Citing this family (66)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2780165B1 (fr) * 1998-06-17 2003-06-13 Fort Fibres Optiques Rech Tech Fibre optique munie d'un revetement de protection et procede de fabrication de cette fibre
DE69929152T2 (de) * 1998-10-08 2006-08-24 Heraeus Tenevo Gmbh Verfahren zum Herstellen einer Vorform aus Quarzglas für optische Fasern und das dafür verwendete Quarzglasrohr
WO2000026150A1 (fr) * 1998-10-29 2000-05-11 Sumitomo Electric Industries, Ltd. Procede de production de preforme et de fibre optique
KR100306381B1 (ko) * 1998-12-10 2001-11-30 윤종용 증착튜브의응축및클로징을위한광섬유모재제조장치및그방법
DE60032363T2 (de) * 1999-04-26 2007-09-27 Corning Incorporated Optische faser mit niedrigen polarisationsmodendispersion sowie dämpfung und ihre herstelungsverfahren
US6210487B1 (en) * 1999-08-26 2001-04-03 Lucent Technologies Inc. Disposable seal system with integral buffer
US6430967B1 (en) * 1999-10-26 2002-08-13 Fitel Usa Corp. Pressure monitoring system using disposable seals
KR100350222B1 (ko) * 2000-03-02 2002-08-27 엘지전선 주식회사 인이 첨가되지 않은 싱글모드광섬유 제조방법과 그에사용되는 외경제어시스템
KR100374352B1 (ko) * 2000-03-23 2003-03-04 삼성전자주식회사 광섬유 모재 제조공정에서 압력 제어 시스템 및 방법
DE10025176A1 (de) * 2000-05-24 2001-12-06 Heraeus Quarzglas Verfahren für die Herstellung einer optischen Faser und Vorform für eine optische Faser
US6502427B1 (en) * 2000-10-31 2003-01-07 Alcatel Method and apparatus for controlling an outside diameter of a preform bait tube during a glass layer deposition process
US6701753B2 (en) * 2001-02-11 2004-03-09 Fitel Usa Corp. Method and apparatus for making improved optical fiber preforms and optical fiber therefrom
US20020150333A1 (en) * 2001-02-17 2002-10-17 Reed William Alfred Fiber devices using grin fiber lenses
US6542665B2 (en) 2001-02-17 2003-04-01 Lucent Technologies Inc. GRIN fiber lenses
US6760112B2 (en) 2001-02-17 2004-07-06 Lucent Technologies Inc. Grin-fiber lens based optical endoscopes
US20020140942A1 (en) * 2001-02-17 2002-10-03 Fee Michale Sean Acousto-optic monitoring and imaging in a depth sensitive manner
KR20020073748A (ko) * 2001-03-16 2002-09-28 (주)옵토네스트 수정된 화학기상증착법에 의한 광섬유모재 제조방법 및이를 이용하여 제조된 비선형광섬유
US6705123B2 (en) 2001-03-30 2004-03-16 Corning Incorporated Making a photosensitive fiber with collapse of a MCVD tube that is in a small positive pressure atmosphere
FR2823198B1 (fr) 2001-04-09 2003-07-04 Cit Alcatel Procede de fabrication de preformes a grande capacite par mcvd
EP1260841B1 (de) * 2001-05-19 2007-07-11 Lucent Technologies Inc. Linsen aus Brechungsindexgradientfaser
NL1018239C2 (nl) * 2001-06-08 2002-12-10 Draka Fibre Technology Bv Optische vezel en werkwijze voor het vervaardigen van een optische vezel.
US6574994B2 (en) * 2001-06-18 2003-06-10 Corning Incorporated Method of manufacturing multi-segmented optical fiber and preform
KR100383627B1 (ko) * 2001-06-23 2003-05-14 삼성전자주식회사 변형화학 기상증착법을 이용한 광섬유 모재 제조장치에서자동 석영관 레벨링장치
KR100420175B1 (ko) * 2001-09-08 2004-03-02 엘지전선 주식회사 광섬유모재와 그 제조방법
US20030061990A1 (en) * 2001-10-03 2003-04-03 Alcatel CVD diameter control with particle separation
KR100423230B1 (ko) * 2001-10-19 2004-03-18 엘지전선 주식회사 석영관의 불순물을 제거하는 방법 및 장치
KR100692652B1 (ko) * 2001-11-05 2007-03-13 엘에스전선 주식회사 광섬유 프리폼 제조방법
US6798515B1 (en) 2001-11-29 2004-09-28 Cognex Technology And Investment Corporation Method for calculating a scale relationship for an imaging system
US7162073B1 (en) 2001-11-30 2007-01-09 Cognex Technology And Investment Corporation Methods and apparatuses for detecting classifying and measuring spot defects in an image of an object
JP2003183042A (ja) * 2001-12-14 2003-07-03 Shin Etsu Chem Co Ltd 光ファイバ用母材の製造方法及びその製造方法で製造した光ファイバ用母材
US6636298B1 (en) 2001-12-18 2003-10-21 Cognex Technology And Investment Corporation Method and apparatus for focusing an optical inspection system
US7221805B1 (en) 2001-12-21 2007-05-22 Cognex Technology And Investment Corporation Method for generating a focused image of an object
US6983065B1 (en) 2001-12-28 2006-01-03 Cognex Technology And Investment Corporation Method for extracting features from an image using oriented filters
US6941016B1 (en) 2001-12-31 2005-09-06 Cognex Technology And Investment Method for finding contours in an image of an object
GB0201492D0 (en) * 2002-01-23 2002-03-13 Blazephotonics Ltd A method and apparatus relating to optical fibres
US6769275B2 (en) 2002-03-15 2004-08-03 Fibercore, Inc. Method for making optical fiber preform using simultaneous inside and outside deposition
NL1020781C2 (nl) 2002-06-06 2003-12-09 Draka Fibre Technology Bv Werkwijze voor het vervaardigen van een massieve voorvorm.
DE10225773B4 (de) * 2002-06-10 2005-03-31 Heraeus Tenevo Ag Jacketrohr aus synthetisch hergestelltem Quarzglas
AU2003228119A1 (en) * 2002-09-03 2004-03-29 Lg Cable Ltd. Method for making optical fiber preform having ultimately low pmd through improvement of ovality
WO2004041737A1 (en) * 2002-11-07 2004-05-21 Ls Cable Ltd. Method for manufacturing an optical fiber preform by mcvd
US20040144133A1 (en) * 2003-01-23 2004-07-29 Fletcher Joseph Patrick Methods for joining glass preforms in optical fiber manufacturing
US20040159124A1 (en) * 2003-02-14 2004-08-19 Atkins Robert M. Optical fiber manufacture
JP2004307280A (ja) * 2003-04-08 2004-11-04 Shin Etsu Chem Co Ltd Oh基による吸収を減少した光ファイバ用ガラス母材及びその製造方法
CN1226211C (zh) * 2003-06-27 2005-11-09 长飞光纤光缆有限公司 一种低水峰单模光纤的制造方法
US7793612B2 (en) * 2003-08-01 2010-09-14 Silica Tech, Llc Ring plasma jet method and apparatus for making an optical fiber preform
FR2863606B1 (fr) * 2003-12-15 2007-06-01 Cit Alcatel Procede de realisation d'une preforme a fibre optique, preforme a fibre optique et fibre optique associees
CN1922114B (zh) * 2004-02-27 2010-04-21 住友电气工业株式会社 制造光纤预制件的方法及设备
JP2005263557A (ja) * 2004-03-18 2005-09-29 Shin Etsu Chem Co Ltd 多孔質ガラス母材の焼結方法及び焼結装置
DE102004014345B4 (de) * 2004-03-22 2007-09-20 Heraeus Tenevo Gmbh Verfahren zur Herstellung eines optischen Bauteils
DE102005034594B4 (de) * 2005-07-20 2008-09-25 J-Fiber Gmbh Verfahren zur Herstellung von Glasfaserpreformen mit einem großen Kerndurchmesser
US20070062223A1 (en) * 2006-10-16 2007-03-22 Sterlite Optical Technologies Ltd Optical fiber having reduced polarization mode dispersion (PMD) and method for producing the same
NL1034059C2 (nl) * 2007-06-29 2008-12-30 Draka Comteq Bv Werkwijze voor het vervaardigen van een voorvorm voor optische vezels onder toepassing van een dampdepositieproces.
US8252387B2 (en) * 2007-12-10 2012-08-28 Ofs Fitel, Llc Method of fabricating optical fiber using an isothermal, low pressure plasma deposition technique
NL2002423C2 (en) * 2009-01-16 2010-07-19 Draka Comteq Bv Method and system to manufacture an optical fibre preform.
NL2002422C2 (en) * 2009-01-16 2010-07-19 Draka Comteq Bv Method and system to manufacture an optical fibre preform.
JP5603024B2 (ja) * 2009-01-20 2014-10-08 古河電気工業株式会社 光ファイバ母材の製造方法
US20110100061A1 (en) 2009-10-30 2011-05-05 James Fleming Formation of microstructured fiber preforms using porous glass deposition
US9279935B2 (en) 2010-12-23 2016-03-08 Prysmian S.P.A. Low macrobending loss single-mode optical fibre
DK2655274T3 (da) * 2010-12-23 2017-11-27 Prysmian Spa Fremgangsmåde til fremstilling af en præform af glas til optiske fibre
JP2013032241A (ja) * 2011-08-01 2013-02-14 Sumitomo Electric Ind Ltd 光ファイバ母材製造方法
JP5916551B2 (ja) * 2011-09-30 2016-05-11 株式会社フジクラ 光ファイバ用母材の製造方法、及び、光ファイバの製造方法
JP5486573B2 (ja) * 2011-09-30 2014-05-07 株式会社フジクラ 光ファイバ用母材の製造方法、及び、光ファイバの製造方法
NL2015161B1 (en) * 2015-07-13 2017-02-01 Draka Comteq Bv A method for preparing a primary preform by etching and collapsing a deposited tube.
JP6687464B2 (ja) * 2016-05-24 2020-04-22 株式会社ミツトヨ 測定装置及び軸物ワーク支持機構
US11213912B2 (en) * 2018-06-25 2022-01-04 Bwxt Nuclear Operations Group, Inc. Methods and systems for monitoring a temperature of a component during a welding operation
CN113670228B (zh) * 2021-09-27 2025-03-28 江苏亨通光导新材料有限公司 一种光纤预制棒弯曲度的立式检测方法及其专用检测装置

Family Cites Families (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4217027A (en) * 1974-02-22 1980-08-12 Bell Telephone Laboratories, Incorporated Optical fiber fabrication and resulting product
US4339173A (en) * 1975-09-08 1982-07-13 Corning Glass Works Optical waveguide containing P2 O5 and GeO2
JPS5792536A (en) * 1980-11-29 1982-06-09 Dainichi Nippon Cables Ltd Preparation of parent material of optical glass fiber
IT1155119B (it) * 1982-03-05 1987-01-21 Cselt Centro Studi Lab Telecom Procedimento e dispositivo per la produzione di preforme per fibre ottiche
US4477273A (en) * 1982-06-15 1984-10-16 At&T Technologies, Inc. Method of and apparatus for straightening and configuring a preform tube from which lightguide fiber is drawn
US4596589A (en) * 1984-02-09 1986-06-24 Perry Gregory A Method for producing a single mode fiber preform
US4632684A (en) * 1984-07-31 1986-12-30 Itt Corporation Method of and apparatus for making optical preforms from tubular bodies
JPH0665613B2 (ja) * 1985-09-06 1994-08-24 三菱電線工業株式会社 石英ガラス管
US4820322A (en) * 1986-04-28 1989-04-11 American Telephone And Telegraph Company At&T Bell Laboratories Method of and apparatus for overcladding a glass rod
JPS63256545A (ja) * 1987-04-14 1988-10-24 Sumitomo Electric Ind Ltd 光フアイバ用母材の製造方法
GB2208114A (en) * 1987-07-01 1989-03-01 Pirelli General Plc Optical fibre preforms
DE3731604A1 (de) * 1987-09-19 1989-03-30 Philips Patentverwaltung Verfahren zur herstellung einer monomode-lichtleitfaser
DE3921086A1 (de) * 1989-06-28 1991-01-03 Kabelmetal Electro Gmbh Verfahren zur herstellung von lichtwellenleitern mit aufschmelzen eines ueberwurfrohres auf eine roh-vorform
US5044724A (en) * 1989-12-22 1991-09-03 At&T Bell Laboratories Method of producing optical fiber, and fiber produced by the method
US5000771A (en) * 1989-12-29 1991-03-19 At&T Bell Laboratories Method for manufacturing an article comprising a refractory dielectric body
US5059230A (en) * 1990-01-22 1991-10-22 At&T Bell Laboratories Fabrication of doped filament optical fibers
JPH04270132A (ja) * 1991-02-25 1992-09-25 Sumitomo Electric Ind Ltd 光ファイバ用ガラス母材の製造方法
DE69420818T2 (de) * 1993-11-29 2000-05-25 At & T Corp., New York Verfahren zum Herstellen von Vorformen für optische Fasern
KR0162604B1 (ko) * 1994-10-07 1999-04-15 김광호 광 섬유 모재 제조 방법
US6131415A (en) * 1997-06-20 2000-10-17 Lucent Technologies Inc. Method of making a fiber having low loss at 1385 nm by cladding a VAD preform with a D/d<7.5

Also Published As

Publication number Publication date
KR100327463B1 (ko) 2002-03-07
BR9902718A (pt) 2000-03-21
KR20000011715A (ko) 2000-02-25
EP0972752B1 (de) 2002-03-06
DE69900958T2 (de) 2002-11-21
CN1241542A (zh) 2000-01-19
CN1101344C (zh) 2003-02-12
EP0972752A1 (de) 2000-01-19
US6105396A (en) 2000-08-22
DE69900958D1 (de) 2002-04-11
TW476738B (en) 2002-02-21

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