DE69900958D1 - Verfahren zur Herstellung einer grossen Vorform für einzelmode Fasern - Google Patents

Verfahren zur Herstellung einer grossen Vorform für einzelmode Fasern

Info

Publication number
DE69900958D1
DE69900958D1 DE69900958T DE69900958T DE69900958D1 DE 69900958 D1 DE69900958 D1 DE 69900958D1 DE 69900958 T DE69900958 T DE 69900958T DE 69900958 T DE69900958 T DE 69900958T DE 69900958 D1 DE69900958 D1 DE 69900958D1
Authority
DE
Germany
Prior art keywords
tube
preform
less
diameter
core
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
DE69900958T
Other languages
English (en)
Other versions
DE69900958T2 (de
Inventor
Paul Francis Glodis
Charles Francis Gridley
Donald Paul Jablonowski
David Kalish
Kenneth Lee Walker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia of America Corp
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 DE69900958D1 publication Critical patent/DE69900958D1/de
Publication of DE69900958T2 publication Critical patent/DE69900958T2/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
    • C03B37/01211—Manufacture 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
    • 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]
    • C03B37/018—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] 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
    • C03B37/01861—Means for changing or stabilising the diameter or form of tubes or rods
    • C03B37/01869—Collapsing
    • 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]
    • C03B37/018—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] 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
    • C03B37/01884—Means for supporting, rotating and translating tubes or rods being formed, e.g. lathes
    • 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]
    • C03B37/018—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] 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
    • C03B37/01884—Means for supporting, rotating and translating tubes or rods being formed, e.g. lathes
    • C03B37/01892—Deposition substrates, e.g. tubes, mandrels
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2201/00—Type of glass produced
    • C03B2201/02—Pure silica glass, e.g. pure fused quartz
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2201/00—Type of glass produced
    • C03B2201/02—Pure silica glass, e.g. pure fused quartz
    • C03B2201/03—Impurity concentration specified
    • C03B2201/04—Hydroxyl ion (OH)
    • 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
    • C03B2201/07—Impurity concentration specified
    • C03B2201/075—Hydroxyl ion (OH)
    • 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]
DE69900958T 1998-07-14 1999-07-06 Verfahren zur Herstellung einer grossen Vorform für einzelmode Fasern Expired - Lifetime DE69900958T2 (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 (2)

Publication Number Publication Date
DE69900958D1 true DE69900958D1 (de) 2002-04-11
DE69900958T2 DE69900958T2 (de) 2002-11-21

Family

ID=22363362

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69900958T Expired - Lifetime DE69900958T2 (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 (65)

* 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
EP1000908B1 (de) * 1998-10-08 2005-12-28 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
MXPA01010868A (es) * 1999-04-26 2002-05-06 Corning Inc Una fibra optica y un metodo para fabricar una fibra optica con dispersion de modo de baja polarizacion y de baja atenuacion.
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
US20020140942A1 (en) * 2001-02-17 2002-10-03 Fee Michale Sean Acousto-optic monitoring and imaging in a depth sensitive manner
US6760112B2 (en) 2001-02-17 2004-07-06 Lucent Technologies Inc. Grin-fiber lens based optical endoscopes
US6542665B2 (en) * 2001-02-17 2003-04-01 Lucent Technologies Inc. GRIN fiber lenses
US20020150333A1 (en) * 2001-02-17 2002-10-17 Reed William Alfred Fiber devices using grin fiber lenses
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
EP1535091A4 (de) * 2002-09-03 2006-03-01 Lg Cable Ltd Verfahren zur herstellung eines faseroptischen preforms mit letztendlich niedriger pmd durch verbesserung der ovalität
AU2003235321A1 (en) * 2002-11-07 2004-06-07 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
EP1719739B1 (de) * 2004-02-27 2013-06-19 Sumitomo Electric Industries, Ltd. Verfahren und vorrichtung zur herstellung einer vorform für eine optische faser
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
NL2002422C2 (en) * 2009-01-16 2010-07-19 Draka Comteq Bv Method and system to manufacture an optical fibre preform.
NL2002423C2 (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
WO2012084049A1 (en) * 2010-12-23 2012-06-28 Prysmian S.P.A. Method of manufacturing an optical fibre glass preform
US9279935B2 (en) 2010-12-23 2016-03-08 Prysmian S.P.A. Low macrobending loss single-mode optical 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

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 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
TW476738B (en) 2002-02-21
BR9902718A (pt) 2000-03-21
ATE214037T1 (de) 2002-03-15
US6105396A (en) 2000-08-22
KR100327463B1 (ko) 2002-03-07
CN1241542A (zh) 2000-01-19
DE69900958T2 (de) 2002-11-21
EP0972752B1 (de) 2002-03-06
EP0972752A1 (de) 2000-01-19
KR20000011715A (ko) 2000-02-25
CN1101344C (zh) 2003-02-12

Similar Documents

Publication Publication Date Title
DE69900958D1 (de) Verfahren zur Herstellung einer grossen Vorform für einzelmode Fasern
AU723038B2 (en) Optical fiber having low loss at 1385nm and method for making same
EP0381473B1 (de) Polarisationserhaltende optische Faser
EP0182250B1 (de) Verfahren zur Herstellung von Glasvorformen für optische Fasern
US4125388A (en) Method of making optical waveguides
KR900002263B1 (ko) 광파이버용 모재의 제조방법
US4675040A (en) Method for producing glass preform for single mode optical fiber
EP0915064B1 (de) Verfahren zum Herstellen von Vorformen für optische Wellenleiter mit einem Segmentkern
EP0966407A4 (de) Verfahren zum herstellen einer optischen faser mit brechungsindexabsenkung im kernbereich
EP2655274B1 (de) Verfahren zur herstellung einer optischen glasfaservorform
ATE19388T1 (de) Verfahren zur herstellung von lichtleitfasern.
KR20090127300A (ko) 고형화에서의 광섬유 캐인/프리폼 변형의 저감
CA1270680A (en) Low-loss silica optical waveguides
EP2294021A1 (de) Verfahren zur herstellung eines optischen vorformlings
EP0718244B1 (de) Verfahren zur Herstellung von optischen Fasern mit Brechungsindexabsenkung im Kernbereich der Faser
AU670505B2 (en) Optical fiber preform, optical fiber and their manufacturing methods
US5163987A (en) Method for producing glass preform for optical fiber
KR101057173B1 (ko) 광섬유 및 그의 모재의 제조방법
US4952225A (en) Method of making an internally-doped tube of transparent glass, in particular for manufacturing rare-earth-doped optical fibers
EP1870382A1 (de) Verfahren zur Ummantelung einer Glasfaservorform
EP0138511A1 (de) Verfahren zur Herstellung einer beschichteten Einfachpolarisationsfaser
GB2211498A (en) Method of manufacturing a light guide
GB2082568A (en) Lightguide preform fabrication
WO2006083354A2 (en) Low-water optical fiber preform and process for making it
Choi et al. Fabrication and characteristics evaluation of PANDA polarization-maintaining optical fibers with B 2 O 3 SAP's by VAD method

Legal Events

Date Code Title Description
8364 No opposition during term of opposition