USRE30635E - Method of producing internally coated glass tubes for the drawing of fibre optic light conductors - Google Patents

Method of producing internally coated glass tubes for the drawing of fibre optic light conductors Download PDF

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Publication number
USRE30635E
USRE30635E US06/079,847 US7984779A USRE30635E US RE30635 E USRE30635 E US RE30635E US 7984779 A US7984779 A US 7984779A US RE30635 E USRE30635 E US RE30635E
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US
United States
Prior art keywords
tube
iadd
iaddend
gas mixture
internally coated
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
US06/079,847
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English (en)
Inventor
Dieter Kuppers
Hans Lydtin
Ludwig Rehder
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Plasma Optical Fibre BV
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US Philips Corp
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Publication of USRE30635E publication Critical patent/USRE30635E/en
Anticipated expiration legal-status Critical
Assigned to PLASMA OPTICAL FIBRE B.V. reassignment PLASMA OPTICAL FIBRE B.V. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: U.S. PHILIPS CORPORATION
Expired - Lifetime legal-status Critical Current

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    • 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
    • C03B37/01807—Reactant delivery systems, e.g. reactant deposition burners
    • C03B37/01815—Reactant deposition burners or deposition heating means
    • C03B37/01823—Plasma deposition burners or heating means
    • C03B37/0183—Plasma deposition burners or heating means for plasma within a tube substrate

Definitions

  • the invention relates to a method for producing internally coated glass tubes, consisting of a core and a jacket of glasses which have a mutually different refractive index, by means of a reactive deposition of the coating from a gas mixture which is passed through the tube and which is brought to reaction in the tube.
  • the tubes produced in this manner are heated to a temperature which is suitable for drawing and thereafter drawn to such an extent that the diameter is reduced until the coating is brought to coincidence and a light conductor of the required diameter is obtained.
  • Light conductors consist of a light-conducting core which is embedded in a jacket of a lower refractive index.
  • the core may, for example, consist of quartz glass which has been doped with a few percent of a metal oxide which increases the refractive index and the jacket of undoped quartz glass.
  • the tube may consist of non-doped quartz glass.
  • a uniform relative motion in .Iadd.an .Iaddend.axial direction may be caused between the tube and a high frequency pulse which envelopes the tube .[.a.]..Iadd..
  • a .Iaddend.uniform distribution of the deposit is enhanced by the fact that the tube is rotated during the coating procedure.
  • this object is realized by means of a method which is characterized in that in the tube a non-isothermal plasma zone is produced for the activation of the reactive deposition while a relative motion is caused between the tube and the equipment which produces the plasma, and a temperature zone in which the tube is heated to such a temperature that the deposited coatings are stress-free is superimposed on the plasma zone and that deposition takes place at a pressure of between 1 and 100 Torr.
  • non-isothermal plasma is understood to mean a zone in which the kinetic energy of the gas particles is small compared with the energy of the excited electronic states.
  • dissociated and ionised particles are available, which are favourable for the reaction and promote it.
  • the method according to the invention also enables the direct reactive deposition on a quartz wire or quartz rod which is arranged inside the tube.
  • deposition rates of from 2500 ⁇ m/hour can be attained.
  • the method according to the invention makes it .[.therefore.]. possible .Iadd.therefore, .Iaddend.to obtain in an economic way a uniform deposition over long tube lengths.
  • a heating up of the tube (temperature zone) of greater length is superimposed on the plasma zone.
  • the temperature shall then not be chosen that high that a homogeneous gas reaction could take place, but it must at least be chosen that high that the deposited coatings are stress-free.
  • Heating of the tube to a temperature of between 800° C. and 1200° C., for example in the GeCl 4 /oxygen system, does not or to only a small extent affect the deposition rate.
  • the consistency of the deposited coating is favourably influenced on the one hand because, at the chosen temperatures the mobility of the deposited matter is still sufficient to obtain a stress-free coat and on the other hand because the embedding of gaseous reaction products is avoided.
  • the plasma may be produced in any way, known in the art, for example by the inductive or capacitive coupling of a high frequency field or in a microwave resonator.
  • FIG. 1 is a diagrammatic representation of a device for performing the method according to the invention
  • FIG. 2 shows the attenuation of a fibre optic light conductor drawn from a tube produced according to the invention.
  • a tube 1, for example made of quartz is moved to a heating device 2, for example an electric heating coil in the direction indicated by arrows.
  • the heating device 2 is enveloped by a resonator 3 by means of which a plasma 4 can be produced in the gas mixture passed through the quartz tube 1.
  • a coating 5 is directly formed on the inner wall of the tube 1.
  • the deposition of non-doped SiO 2 The deposition of non-doped SiO 2 .
  • the mixture consisted of 7 volume % SiCl 4 and 93 volume % oxygen.
  • the pressure in tube 1 was 12 Torr.
  • the wall temperature was kept at 1000° C.
  • the tube 1 was passed at a speed of 0.17 cm per minute through the device, formed by heating device 2 having a length of 500 mm and resonator 3 having a length of 30 mm, while a plasma 4 was produced by a 2.45 GHz generator.
  • a mixture of 0.4 volume % AlCl 3 , 4 volume % SiCl 4 and .Badd.95.6 volume % oxygen was passed through the quartz tube at a throughput of 42 scm 3 per minute (length and diameter as in Example I).
  • the pressure in the tube 1 was 15 Torr.
  • the wall temperature of the tube 1 was kept at 950° C.
  • a plasma 4 as in Example I was produced. (Power 180 W, frequency 2.45 GHz).
  • the reaction efficiency was approximately 100%.
  • the tube was passed through the device 2-3 at a speed of 60 cm per minute while the resonator 3 was moved forward and backward along the tube 1.
  • a homogeneous, adhering coat 5 was obtained.
  • the total thickness of the coating was 150 ⁇ m.
  • FIG. 2 shows the total attenuation in dB per km as a function of the wavelength in micrometer of a fiber optic light conductor which was obtained by drawing at 1900° C. of an internally coated tube according to Example II.
  • the core diameter was 25 ⁇ m and the fiber diameter was 100 ⁇ m.
  • the difference in the refractive indexes were approximately 5 o/oo.
  • a coating profile which has a certain refractive index in proportion to the doping can be obtained as shown above at a progressive change of the doping share.
  • a suitable profile is chosen the tube forms in an ideal manner a basic product for the production of monomode, multimode and self-focussing fiber optics.
  • Dopant-forming compounds which may be used in the method according to the invention are, for example, GeCl 4 , TiCl 4 , and AlCl 3 which oxidize to form the dopants GeO 2 , TiO 2 , and Al 2 O 3 , respectively.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Plasma & Fusion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)
US06/079,847 1974-09-14 1979-09-28 Method of producing internally coated glass tubes for the drawing of fibre optic light conductors Expired - Lifetime USRE30635E (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2444100A DE2444100C3 (de) 1974-09-14 1974-09-14 Verfahren zur Herstellung von innenbeschichteten Glasrohren zum Ziehen von Lichtleitfasern
DE2444100 1974-09-14

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
US61057075A Continuation 1974-09-14 1975-09-05
US05/852,068 Reissue US4145456A (en) 1974-09-14 1977-11-16 Method of producing internally coated glass tubes for the drawing of fibre optic light conductors

Publications (1)

Publication Number Publication Date
USRE30635E true USRE30635E (en) 1981-06-02

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US06/079,847 Expired - Lifetime USRE30635E (en) 1974-09-14 1979-09-28 Method of producing internally coated glass tubes for the drawing of fibre optic light conductors

Country Status (5)

Country Link
US (1) USRE30635E (enrdf_load_stackoverflow)
JP (1) JPS5651138B2 (enrdf_load_stackoverflow)
DE (1) DE2444100C3 (enrdf_load_stackoverflow)
FR (1) FR2284572A1 (enrdf_load_stackoverflow)
GB (1) GB1519994A (enrdf_load_stackoverflow)

Cited By (47)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4384038A (en) 1980-11-25 1983-05-17 U.S. Philips Corporation Method of producing integrated optical waveguide circuits and circuits obtained by this method
US4405655A (en) 1981-05-01 1983-09-20 U.S. Philips Corporation Method and arrangement for internally coating a tube by reactive deposition from a gas mixture activated by a plasma
US4422915A (en) 1979-09-04 1983-12-27 Battelle Memorial Institute Preparation of colored polymeric film-like coating
US4468413A (en) 1982-02-15 1984-08-28 U.S. Philips Corporation Method of manufacturing fluorine-doped optical fibers
EP0117009A1 (de) 1983-02-22 1984-08-29 Koninklijke Philips Electronics N.V. Verfahren zum Herstellen einer massiven Vorform zum Ziehen optischer Fasern
EP0129291A1 (en) * 1983-06-15 1984-12-27 Koninklijke Philips Electronics N.V. Method of and device for manufacturing optical fibres
US4536640A (en) 1981-07-14 1985-08-20 The Standard Oil Company (Ohio) High pressure, non-logical thermal equilibrium arc plasma generating apparatus for deposition of coatings upon substrates
FR2584101A1 (fr) * 1985-06-26 1987-01-02 Comp Generale Electricite Dispositif pour fabriquer un composant optique a gradient d'indice de refraction
EP0132011A3 (en) * 1983-07-16 1987-08-19 Philips Patentverwaltung Gmbh Process for producing fibre light guides
US4741747A (en) 1984-12-12 1988-05-03 U.S. Philips Corporation Method of fabricating optical fibers
EP0270157A1 (de) * 1986-11-17 1988-06-08 Koninklijke Philips Electronics N.V. Vorrichtung zum Anbringen von Glasschichten auf der Innenseite eines Rohres
US4761170A (en) 1985-06-20 1988-08-02 Polaroid Corporation Method for employing plasma in dehydration and consolidation of preforms
DE3720029A1 (de) * 1987-06-16 1988-12-29 Philips Patentverwaltung Verfahren zur herstellung von lichtleitfasern
US4871383A (en) 1987-06-16 1989-10-03 U.S. Philips Corp. Method of manufacturing optical fibres
EP0295745A3 (en) * 1987-06-16 1989-11-29 Philips Patentverwaltung Gmbh Method for making optical fibers
US5188648A (en) * 1985-07-20 1993-02-23 U.S. Philips Corp. Method of manufacturing optical fibres
US6138478A (en) 1992-09-21 2000-10-31 Ceramoptec Industries, Inc. Method of forming an optical fiber preform using an E020 plasma field configuration
NL1018951C2 (nl) * 2001-09-13 2003-03-14 Draka Fibre Technology Bv Werkwijze voor het vervaardigen van een staafvormig vormdeel alsmede een werkwijze voor het uit een dergelijk staafvormig vormdeel vervaardigen van optische vezels.
US6574994B2 (en) * 2001-06-18 2003-06-10 Corning Incorporated Method of manufacturing multi-segmented optical fiber and preform
US20030118305A1 (en) * 2001-02-17 2003-06-26 Reed William Alfred Grin fiber lenses
US20040115377A1 (en) * 2002-06-11 2004-06-17 Ronghua Wei Tubular structures with coated interior surfaces
US6764714B2 (en) 2002-06-11 2004-07-20 Southwest Research Institute Method for depositing coatings on the interior surfaces of tubular walls
US7052736B2 (en) 2002-06-11 2006-05-30 Southwest Research Institute Method for depositing coatings on the interior surfaces of tubular structures
US20070003197A1 (en) * 2002-04-10 2007-01-04 Pieter Matthijsse Method and device for manufacturing optical preforms, as well as the optical fibres obtained therewith
US20070127878A1 (en) * 2005-11-10 2007-06-07 Draka Comteq B.V. Single mode optical fiber
US20070280615A1 (en) * 2006-04-10 2007-12-06 Draka Comteq B.V. Single-mode Optical Fiber
US20080138021A1 (en) * 2006-07-04 2008-06-12 Draka Comteq B.V. Fluorine-Doped Optical Fiber
US20080274300A1 (en) * 2007-05-01 2008-11-06 Mattheus Jacobus Nicolaas Van Stralen Apparatus for carrying out plasma chemical vapour deposition and method of manufacturing an optical preform
WO2009062131A1 (en) 2007-11-09 2009-05-14 Draka Comteq, B.V. Microbend- resistant optical fiber
US20090148613A1 (en) * 2007-12-10 2009-06-11 Furukawa Electric North America, Inc. Method of fabricating optical fiber using an isothermal, low pressure plasma deposition technique
US20090279836A1 (en) * 2008-05-06 2009-11-12 Draka Comteq B.V. Bend-Insensitive Single-Mode Optical Fiber
US20100092139A1 (en) * 2007-11-09 2010-04-15 Draka Comteq, B.V. Reduced-Diameter, Easy-Access Loose Tube Cable
US20100092140A1 (en) * 2007-11-09 2010-04-15 Draka Comteq, B.V. Optical-Fiber Loose Tube Cables
US20100092138A1 (en) * 2007-11-09 2010-04-15 Draka Comteq, B.V. ADSS Cables with High-Performance Optical Fiber
US20100119202A1 (en) * 2008-11-07 2010-05-13 Draka Comteq, B.V. Reduced-Diameter Optical Fiber
US20100135624A1 (en) * 2007-11-09 2010-06-03 Draka Comteq, B.V. Reduced-Size Flat Drop Cable
US20100135625A1 (en) * 2007-11-09 2010-06-03 Draka Comteq, B.V. Reduced-Diameter Ribbon Cables with High-Performance Optical Fiber
US20100135623A1 (en) * 2007-11-09 2010-06-03 Draka Comteq, B.V. Single-Fiber Drop Cables for MDU Deployments
US20110069932A1 (en) * 2007-11-09 2011-03-24 Draka Comteq, B.V. High-Fiber-Density Optical-Fiber Cable
US20110308461A1 (en) * 2004-06-22 2011-12-22 Walton Scott G Electron Beam Enhanced Nitriding System (EBENS)
EP2527893A1 (en) 2011-05-27 2012-11-28 Draka Comteq BV Single mode optical fiber
EP2533082A1 (en) 2011-06-09 2012-12-12 Draka Comteq BV Single mode optical fiber
EP2541292A1 (en) 2011-07-01 2013-01-02 Draka Comteq BV Multimode optical fibre
WO2015092464A1 (en) 2013-12-20 2015-06-25 Draka Comteq Bv Single mode fibre with a trapezoid core, showing reduced losses
US9405062B2 (en) 2011-04-27 2016-08-02 Draka Comteq B.V. High-bandwidth, radiation-resistant multimode optical fiber
WO2019122943A1 (en) 2017-12-21 2019-06-27 Draka Comteq France Bending-loss insensitve single mode fibre, with a shallow trench, and corresponding optical system
US10767264B2 (en) 2016-04-10 2020-09-08 Draka Comteq B.V. Method and an apparatus for performing a plasma chemical vapour deposition process and a method

Families Citing this family (16)

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JPS51119237A (en) * 1975-04-11 1976-10-19 Sumitomo Electric Ind Ltd Manufacturing method of glass fiber for optical communication
JPS599490B2 (ja) * 1975-04-16 1984-03-02 日本電信電話株式会社 光学的繊維の製造方法
DE2642949C3 (de) * 1976-09-24 1980-11-20 Philips Patentverwaltung Gmbh, 2000 Hamburg Verfahren zur Herstellung von innenbeschichteten Glasrohren zum Ziehen von Lichtleitfasern
CA1080562A (en) * 1977-02-10 1980-07-01 Frederick D. King Method of and apparatus for manufacturing an optical fibre with plasma activated deposition in a tube
GB1603949A (en) * 1978-05-30 1981-12-02 Standard Telephones Cables Ltd Plasma deposit
DE2950446A1 (en) * 1978-08-18 1980-12-04 Western Electric Co The fabrication of optical fibers utilizing thermophoretic deposition of glass precursor particulates
DE2929166A1 (de) * 1979-07-19 1981-01-29 Philips Patentverwaltung Verfahren zur herstellung von lichtleitfasern
DE3027450C2 (de) * 1980-07-19 1982-06-03 Standard Elektrik Lorenz Ag, 7000 Stuttgart Verfahren zur Innenbeschichtung eines Glas-Substratrohres für die Herstellung eines Glasfaser-Lichtleiters
NL8103648A (nl) * 1981-08-03 1983-03-01 Philips Nv Werkwijze voor de vervaardiging van voorvormen voor het trekken van optische vezels en voorvormen volgens deze werkwijze verkregen en inrichting voor het continu vervaardigen van optische vezels.
NL8201453A (nl) * 1982-04-06 1983-11-01 Philips Nv Werkwijze voor de vervaardiging van optische vezels.
DE3222189A1 (de) * 1982-06-12 1984-01-26 Hans Dr.Rer.Nat. 5370 Kall Beerwald Plasmaverfahren zur innenbeschichtung von rohren mit dielektrischem material
DE3330910A1 (de) * 1983-08-27 1985-03-07 Philips Patentverwaltung Gmbh, 2000 Hamburg Verfahren zum herstellen eines reaktionsgefaesses fuer kristallzuchtzwecke
US4718929A (en) * 1983-10-21 1988-01-12 Corning Glass Works Vapor phase method for making metal halide glasses
GB8414878D0 (en) * 1984-06-11 1984-07-18 Gen Electric Co Plc Integrated optical waveguides
DE3626276A1 (de) * 1986-08-02 1988-02-18 Rheydt Kabelwerk Ag Verfahren zur herstellung von vorformen fuer lichtleitfasern
DE4203369C2 (de) * 1992-02-06 1994-08-11 Ceramoptec Gmbh Verfahren und Vorrichtung zur Herstellung von Vorformen für Lichtwellenleiter

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Cited By (92)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4422915A (en) 1979-09-04 1983-12-27 Battelle Memorial Institute Preparation of colored polymeric film-like coating
US4384038A (en) 1980-11-25 1983-05-17 U.S. Philips Corporation Method of producing integrated optical waveguide circuits and circuits obtained by this method
US4405655A (en) 1981-05-01 1983-09-20 U.S. Philips Corporation Method and arrangement for internally coating a tube by reactive deposition from a gas mixture activated by a plasma
US4536640A (en) 1981-07-14 1985-08-20 The Standard Oil Company (Ohio) High pressure, non-logical thermal equilibrium arc plasma generating apparatus for deposition of coatings upon substrates
US4468413A (en) 1982-02-15 1984-08-28 U.S. Philips Corporation Method of manufacturing fluorine-doped optical fibers
EP0117009A1 (de) 1983-02-22 1984-08-29 Koninklijke Philips Electronics N.V. Verfahren zum Herstellen einer massiven Vorform zum Ziehen optischer Fasern
EP0129291A1 (en) * 1983-06-15 1984-12-27 Koninklijke Philips Electronics N.V. Method of and device for manufacturing optical fibres
US4966614A (en) * 1983-06-15 1990-10-30 U.S. Philips Corp. Method of and device for manufacturing optical fibers
EP0132011A3 (en) * 1983-07-16 1987-08-19 Philips Patentverwaltung Gmbh Process for producing fibre light guides
US4741747A (en) 1984-12-12 1988-05-03 U.S. Philips Corporation Method of fabricating optical fibers
US4761170A (en) 1985-06-20 1988-08-02 Polaroid Corporation Method for employing plasma in dehydration and consolidation of preforms
FR2584101A1 (fr) * 1985-06-26 1987-01-02 Comp Generale Electricite Dispositif pour fabriquer un composant optique a gradient d'indice de refraction
US5188648A (en) * 1985-07-20 1993-02-23 U.S. Philips Corp. Method of manufacturing optical fibres
EP0270157A1 (de) * 1986-11-17 1988-06-08 Koninklijke Philips Electronics N.V. Vorrichtung zum Anbringen von Glasschichten auf der Innenseite eines Rohres
DE3720029A1 (de) * 1987-06-16 1988-12-29 Philips Patentverwaltung Verfahren zur herstellung von lichtleitfasern
US4871383A (en) 1987-06-16 1989-10-03 U.S. Philips Corp. Method of manufacturing optical fibres
EP0295745A3 (en) * 1987-06-16 1989-11-29 Philips Patentverwaltung Gmbh Method for making optical fibers
US5133794A (en) * 1987-06-16 1992-07-28 U.S. Philips Corp. Method of manufacturing optical fibres
US6138478A (en) 1992-09-21 2000-10-31 Ceramoptec Industries, Inc. Method of forming an optical fiber preform using an E020 plasma field configuration
US6802190B2 (en) * 2001-02-17 2004-10-12 Lucent Technologies Inc. Method of fabricating a GRIN fiber
US20030118305A1 (en) * 2001-02-17 2003-06-26 Reed William Alfred Grin fiber lenses
US6574994B2 (en) * 2001-06-18 2003-06-10 Corning Incorporated Method of manufacturing multi-segmented optical fiber and preform
US7092611B2 (en) 2001-09-13 2006-08-15 Draka Fibre Technology B.V. Method for manufacturing a bar-shaped preform as well as a method for manufacturing optical fibres from such a bar-shaped preform
NL1018951C2 (nl) * 2001-09-13 2003-03-14 Draka Fibre Technology Bv Werkwijze voor het vervaardigen van een staafvormig vormdeel alsmede een werkwijze voor het uit een dergelijk staafvormig vormdeel vervaardigen van optische vezels.
US7734135B2 (en) 2002-04-10 2010-06-08 Draka Comteq B.V. Method and device for manufacturing optical preforms, as well as the optical fibres obtained therewith
US20070003197A1 (en) * 2002-04-10 2007-01-04 Pieter Matthijsse Method and device for manufacturing optical preforms, as well as the optical fibres obtained therewith
US20040115377A1 (en) * 2002-06-11 2004-06-17 Ronghua Wei Tubular structures with coated interior surfaces
US6764714B2 (en) 2002-06-11 2004-07-20 Southwest Research Institute Method for depositing coatings on the interior surfaces of tubular walls
US7052736B2 (en) 2002-06-11 2006-05-30 Southwest Research Institute Method for depositing coatings on the interior surfaces of tubular structures
US7351480B2 (en) 2002-06-11 2008-04-01 Southwest Research Institute Tubular structures with coated interior surfaces
US20110308461A1 (en) * 2004-06-22 2011-12-22 Walton Scott G Electron Beam Enhanced Nitriding System (EBENS)
US8837889B2 (en) 2005-11-10 2014-09-16 Draka Comteq, B.V. Single mode optical fiber
US7995889B2 (en) 2005-11-10 2011-08-09 Draka Comteq, B.V. Single mode optical fiber
US20070127878A1 (en) * 2005-11-10 2007-06-07 Draka Comteq B.V. Single mode optical fiber
US20100067859A1 (en) * 2005-11-10 2010-03-18 Draka Comteq B.V. Single Mode Optical Fiber
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Also Published As

Publication number Publication date
FR2284572A1 (fr) 1976-04-09
JPS5651138B2 (enrdf_load_stackoverflow) 1981-12-03
JPS5154446A (enrdf_load_stackoverflow) 1976-05-13
GB1519994A (en) 1978-08-02
FR2284572B1 (enrdf_load_stackoverflow) 1979-04-13
DE2444100B2 (de) 1978-08-10
DE2444100A1 (de) 1976-03-25
DE2444100C3 (de) 1979-04-12

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