EP1144324A2 - Guide d'onde dope au tantale et son procede de fabrication - Google Patents

Guide d'onde dope au tantale et son procede de fabrication

Info

Publication number
EP1144324A2
EP1144324A2 EP99972023A EP99972023A EP1144324A2 EP 1144324 A2 EP1144324 A2 EP 1144324A2 EP 99972023 A EP99972023 A EP 99972023A EP 99972023 A EP99972023 A EP 99972023A EP 1144324 A2 EP1144324 A2 EP 1144324A2
Authority
EP
European Patent Office
Prior art keywords
glass
optical fiber
core
soot blank
soot
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.)
Withdrawn
Application number
EP99972023A
Other languages
German (de)
English (en)
Inventor
Evelyn M. Deliso
Deborah L. Marlatt
Michelle D. Pierson
Christine L. Tennent
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.)
Corning Inc
Original Assignee
Corning 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 Corning Inc filed Critical Corning Inc
Publication of EP1144324A2 publication Critical patent/EP1144324A2/fr
Withdrawn legal-status Critical Current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
    • 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
    • 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]
    • C03B37/01446—Thermal after-treatment of preforms, e.g. dehydrating, consolidating, sintering
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • 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
    • C03B2201/30—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi
    • C03B2201/40—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi doped with transition metals other than rare earth metals, e.g. Zr, Nb, Ta or Zn
    • 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
    • C03B2207/90—Feeding the burner or the burner-heated deposition site with vapour generated from solid glass precursors, i.e. by sublimation
    • 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

Definitions

  • the present invention relates generally to optical waveguide glass having a high index of refraction and a method for manufacturing such optical waveguide glass, and more particularly to a method of doping optical waveguide glass with Ta 2 O 5 to produce essentially crystalline free optical waveguide fiber. While the invention is capable of being carried out using a number of soot collection and doping techniques, it is particularly well suited for use in conjunction with the outside vapor deposition (OVD) process, and will be particularly described in that regard.
  • ODD outside vapor deposition
  • optical waveguide fibers include a core surrounded by a cladding material having a refractive index lower than that of the core.
  • Such optical waveguide fibers are generally composed of silica that is selectively doped with a dopant such a germanium.
  • germanium is the principal and most widely used dopant, other dopants such as phosphorous, fluorine, boron and erbium, to name a few, are often used. Germania, however, is most commonly used due to its low melting point and high refractive index in relation to silica.
  • All dopants, including germania have shortcomings that limit their usefulness to certain applications. Accordingly, as technology improves and the requirements for new applications increases, the requirement for new optical waveguide fiber capable of meeting the demands of these applications increases as well. Such needs provide the incentive to consider the application of new dopants and new methods of doping optical waveguide fibers to meet these demands. In addition, competition is continually driving researchers to develop optical waveguide fibers at lower cost. Because germania costs approximately $1 ,000 per kilogram, a less expensive dopant capable of providing a higher index of refraction than germania with less of that alternative dopant would be ideal. One such dopant known to have a high refractive index is tantala.
  • Ta 2 O ⁇ thin films are widely used in thin-film waveguide lenses and anti- reflective coatings for silicon wafer solar cells. Because of the attractiveness of Ta 2 O 5 , thin films for integrated optical devices, many researchers have been active in this area. Thin films for integrated optical devices containing Ta 2 Os are typically fabricated using sputtering techniques and result in measurable losses of about 0.4 dB/cm. In the field of thin-films it is believed that a contributing factor to such high losses is the subsequent heat treatment of thin- films following sputtering. It was found that the heat treatment caused the film to change from amorphous to crystalline.
  • Planar devices have also been fabricated using Ta 2 O 5 .
  • Ta 2 Os-SiO 2 core glass for such devices is laid down using an electron beam vapor deposition technique.
  • the lowest loss observed for such devices has been approximately 0.15 dB/cm or 15,000 dB/km.
  • losses of less than approximately 1 dB/km is the target.
  • a dopant that, in limited quantities, is capable of providing a high core index of refraction to an optical waveguide fiber.
  • a dopant that has good non-linear properties, does not adversely impact the mechanical properties of the optical waveguide fiber in which is resides, and exhibits beneficial amplification characteristics.
  • a method of providing the dopant to an optical waveguide fiber with minimal deviation from present optical fiber manufacturing techniques thus making it economically feasible and desirable.
  • the low cost of tantala compared to germania, as well as tantala's high index of refraction makes it a promising candidate for such a dopant.
  • One aspect of the present invention relates to a method of manufacturing a low loss optical waveguide having a high refractive index core by forming a soot blank which includes Ta 2 O 5 and SiO 2 , consolidating the soot blank to form a cane under conditions suitable to prevent crystallization of the
  • the invention relates to an optical fiber that is manufactured by preparing a soot blank which includes at least Ta 2 O 5 and SiO 2 , consolidating the soot blank to form a cane under conditions suitable to prevent crystallization of the Ta 2 O 5 - SiO 2 containing glass and drawing the cane into an optical fiber.
  • a further aspect of the invention relates to an optical fiber having a high purity glass cladding, and a high refractive index glass core bounded by the cladding.
  • the glass core includes between about 2 to 5 wt% Ta 2 O 5 , so that light attenuation in the optical fiber is less than about 1.8 dB/km at 1550 nm.
  • Yet another aspect of the invention relates to a glass for use in the core of the optical waveguide that includes SiO 2 and, by weight on an oxide basis, between about 2% non-crystallized Ta 2 O 5 , to 5% non-crystallized Ta 2 O 5 after consolidation.
  • the glass and method of the present invention results in a number of advantages over other glasses and methods known in the art.
  • One of the most attractive features of using tantala in the glass for the present invention is its high index of refraction, which is reported to be 2.2 at 632.8 nm. Accordingly, in the glass of the present invention, the same refractive index change can be achieved with a much lower addition of Ta 2 O 5 than can be achieved with GeO 2 .
  • tantala is far less expensive than germania, there is a significant cost savings resulting from the selection of tantala as a dopant.
  • Ta 2 ⁇ 5 -Si ⁇ 2 glass is a function of the high melting point of tantala.
  • Ta 2 Os has a melting point of 1887°C while SiO 2 and GeO 2 have melting points of 1715°C and 1116°C, respectively. Accordingly, the high viscosity of tantala silicate glass makes the glass of the present invention a likely candidate for viscosity matching.
  • tantalum oxide is chemically stable and insoluble in water
  • the thermal expansion of glass containing tantala is lower than that of glass containing germania
  • the method of the present invention essentially eliminates crystallization within the
  • Fig. 1 is a perspective view of an optical fiber manufactured in accordance with the present invention.
  • Fig. 2 is a cross-section view of the optical fiber of Fig. 1 taken through line 2-2 in Fig. 1.
  • Fig. 3 is a cross-section view of a Cl 2 reactor of the present invention.
  • Fig. 4 is a schematic view of a vapor delivery system shown forming a soot blank in accordance with the present invention.
  • Fig. 5 is a schematic view of a first preferred embodiment of a consolidation furnace of the present invention taken in cross-section.
  • Fig. 6 is a schematic view of a second preferred embodiment of a consolidation furnace of the present invention taken in cross-section.
  • Fig. 7 is a photomicrograph of a Ta 2 O 5 doped core glass consolidated at 1450°C in a helium atmosphere.
  • Fig. 8 is a photomicrograph of a Ta 2 O 5 doped core glass consolidated at 1450°C in a helium atmosphere.
  • Fig. 9 is a photomicrograph showing the core-clad interface of Ta 2 O 5 doped glass consolidated at 1450°C in a helium atmosphere.
  • Fig. 10 is a photomicrograph of a Ta 2 O 5 doped core glass consolidated at 1550°C in a helium atmosphere.
  • Fig. 11 is a photomicrograph of a Ta 2 O 5 doped core glass consolidated at 1550°C in a helium atmosphere.
  • Fig. 12 is a photomicrograph of a Ta 2 O 5 doped core glass consolidated at 1550°C in a helium atmosphere.
  • Fig. 13 is a photomicrograph of a Ta 2 O 5 doped core glass consolidated at 1450°C in a vacuum atmosphere.
  • Fig. 14 is a photomicrograph of a Ta 2 Os doped core glass consolidated at 1550°C in a vacuum atmosphere.
  • Fig. 15 is a photomicrograph of a Ta 2 O 5 doped core glass consolidated at 1650°C in a vacuum atmosphere.
  • the present invention expressly contemplates the manufacture of single-mode optical waveguide fibers, multimode optical waveguide fibers, and planar waveguides regardless of any specific description, drawings, or examples set out herein.
  • the present invention can be practiced in conjunction with any of the known optical waveguide processing techniques, including, but not limited to, the outside vapor deposition (OVD) technique, the modified chemical vapor deposition (MCVD) technique, the vertical axial deposition (VAD) technique, the plasma chemical vapor deposition (PCVD) technique, and sol-gel techniques, to name a few.
  • ODD outside vapor deposition
  • MCVD modified chemical vapor deposition
  • VAD vertical axial deposition
  • PCVD plasma chemical vapor deposition
  • sol-gel techniques sol-gel techniques
  • an exemplary embodiment of the optical waveguide of the present invention is shown in Fig. 1 , and is designated generally throughout by reference character 20.
  • the present invention for an optical waveguide fiber 20 includes a high purity glass cladding 22 and a high refractive index glass core 24 bonded by the cladding 22.
  • high purity glass cladding 22 is predominantly silica
  • core 24 includes silica doped with tantala in the desired proportions.
  • light attenuation in optical waveguide fiber 20 is less than 0.25 dB/km at 1550 nm.
  • a preferred embodiment of the method of manufacturing a low-loss optical waveguide having a high refractive index core includes the steps of forming a soot blank which includes Ta 2 O 5 and SiO 2 , consolidating the soot blank to form a cane under conditions suitable to prevent crystallization of the Ta 2 O 5 , and drawing the cane into an optical fiber.
  • the Ta 2 O 5 can be delivered using chemical vapor deposition techniques known in the art or via liquid delivery.
  • the SiO 2 can similarly be delivered using known chemical vapor deposition techniques or liquid delivery.
  • Reactor 26 includes a diffuser 28, a preheat zone 30, and a reaction zone 32. In operation, fragments of tantalum
  • Reactor 26 includes two separate heater coils (not shown) for the for the preheat zone 30 and reaction zone 32. When the heat in the reaction zone is 350°C or greater, a sufficient quantity of TaCI 5 gas is formed in reactor
  • TaCI 5 gas is delivered from vapor delivery system 36 to a burner assembly 38.
  • the TaCI 5 is converted to Ta 2 Os in the burner flame 40 according to the following reaction:
  • TaCIs (g) + 5 O 2 (g) 2 Ta 2 O 5 + 10 Cl 2 (g)
  • Finely divided amorphous Ta 2 Os containing soot 42 is thereafter projected from the flame for capture and further processing.
  • soot 42 is captured on a rotating mandrel 46 to form a soot blank 44.
  • the amount of Ta 2 O 5 captured on soot blank 44 is determined by the number of lateral passes made by burner assembly 38 along the length of soot blank 44, as well as the flow rate of Cl 2 through reactor 26.
  • the consolidation furnaces used for consolidating germania silicate blanks manufactured using OVD techniques typically provide temperatures of between 1000°C and 1450°C. Through experimentation, it has been found that such furnaces do not provide the heat necessary to perform the consolidation step without crystallization in the Ta 2 O 5 -SiO 2 containing glass as required for the present invention. Accordingly, improved consolidation furnaces capable of achieving temperatures in excess of 1450°C are needed for the present invention.
  • the preferred embodiments of such consolidation furnaces are shown schematically in Figs. 5 and 6.
  • Fig. 5 depicts a first preferred embodiment of the consolidation step of the method of manufacturing a low loss optical waveguide having a high refractory index core.
  • Soot blank 44 is held within consolidation furnace 48 where it is exposed to a gas 50.
  • Gases such as, but not limited to, chlorine, helium, and oxygen, or combinations thereof, are delivered into consolidation furnace 48 to form the atmosphere 52 therein.
  • the preferred gas, helium is flowed across soot blank 44 while temperatures within consolidation furnace 48 are preferably elevated to 1600°C or greater. These conditions are maintained within consolidation furnace 48 until the Ta 2 O 5 -SiO 2 core glass temperatures are maintained at 1600°C or higher for a suitable time to sinter and vitrify the glass.
  • the resulting cane is drawn into an optical fiber. It is anticipated that an optical fiber manufactured from a SiO 2 soot blank containing 2 to 5 wt% Ta 2 Os, and heat treated to a temperature of 1600°C or higher in a flowing helium atmosphere will have an attenuation of less than about 0.25 dB/km at 1550 nm. In a preferred embodiment, the temperature range is approximately 1600°C to 1700°C.
  • Fig. 6 depicts a second preferred embodiment of consolidation furnace 48 shown supporting soot blank 44. In this embodiment of the present invention, soot blank 44 is heated within a vacuum atmosphere.
  • vacuum atmosphere means an atmosphere less than atmospheric pressure.
  • a pump 56 or other pressure- reducing device removes the air from within consolidation furnace 48, thereby decreasing the pressure therein.
  • soot blank 44 can be heat treated at temperatures lower than 1600°C to sinter and vitrify soot blank 44.
  • soot blank 44 is heated to a temperature between 1500°C and 1600°C in a vacuum atmosphere so that the Ta 2 O 5 -Si ⁇ 2 core glass temperatures reach between 1500°C and 1600°C for a sufficient time to result in clear glass which is substantially free of crystals.
  • the vacuum atmosphere 54 within consolidation furnace 48 exhibits a pressure of less than about 10 "4 torr.
  • the resulting cane is drawn into an optical fiber.
  • An optical fiber manufactured from a soot blank 44 containing SiO 2 and about 2 to 5 wt% Ta O 5 , and heat treated at temperatures ranging between 1500°C and 1600°C in a vacuum atmosphere having a pressure of less then 10 "4 torr is expected to exhibit attenuation of less than about 0.25 dB/km at 1550 nm.
  • a significant advantage of the method of the present invention is the crystalline free consolidation of Ta 2 O 5 containing soot blanks.
  • the following examples illustrate the effectiveness of the method of the present invention.
  • a core blank was made by depositing 100 passes of Ta 2 ⁇ 5 -Si ⁇ 2 at an analyzed chemical wt% of 5.55 Ta 2 ⁇ s, followed by 177 passes of SiO 2 .
  • the resulting soot preform specimen was cut into cross-sectional slices approximately 25 millimeters long and approximately 50 to 60 millimeters in diameter. Samples were then fired at a temperature of 1450°C in flowing helium as shown in Figs. 7-9.
  • the scanning electron micrographs (SEMs) of the core material (Figs. 7 and 8) and the core material below the core-clad interface (Fig. 9) show that crystallization is prevalent in the Ta 2 ⁇ 5 -Si ⁇ 2 containing glass. As shown clearly in the fiber section 60 of FIG.
  • the silica cladding 62 is easily distinguished from the Ta 2 O 5 -SiO 2 containing core 64 as the cladding 62 has consolidated to a clear, amorphous glass.
  • a core-clad interface region 66 is clearly visible between the cladding 62 and core 64.
  • single-mode step index optical fibers were drawn from other core blanks prepared in a manner substantially similar to that described above with respect to examples 1 - 4.
  • the % ⁇ , and attenuation for fibers containing different amounts of Ta 2 O 5 by weight percent are shown below in Table 1.
  • the consolidation furnace used to heat treat the fibers listed in Table I were standard furnaces commonly used to consolidate GeO 2 -SiO 2 optical fiber preforms. Accordingly, the maximum temperature available for consolidation was 1450°C. Thus, the maximum temperature of 1450°C was used to consolidate each of the core blanks listed in Table I above. The lowest loss attained was for the core blank having 2.9 wt% Ta 2 O 5 . At 1550 nm the attenuation was 1.73 dB/km.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geochemistry & Mineralogy (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Optics & Photonics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Thermal Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Glass Compositions (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)
  • Glass Melting And Manufacturing (AREA)

Abstract

La présente invention porte sur des guides d'onde optiques à faible perte dopés au tantale et sur leurs procédés de fabrication. Une suie de SiO2 est dopée au Ta2O5 de façon à obtenir une ébauche qui est consolidée dans des conditions appropriées pour prévenir la cristallisation dans les guides d'onde contenant Ta2O5-SiO2. La tige obtenue est alors étirée sous forme d'une fibre optique ou recouverte d'une gaine et ensuite étirée sous forme d'une fibre optique. La consolidation à haute température sous atmosphère gazeuse ou à vide est utilisée pour fritter et vitrifier l'ébauche avant l'étirage afin de produire une fibre optique de guide d'onde à faible perte.
EP99972023A 1998-12-30 1999-12-09 Guide d'onde dope au tantale et son procede de fabrication Withdrawn EP1144324A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US11436998P 1998-12-30 1998-12-30
US114369P 1998-12-30
PCT/US1999/029225 WO2000039039A2 (fr) 1998-12-30 1999-12-09 Guide d'onde dope au tantale et son procede de fabrication

Publications (1)

Publication Number Publication Date
EP1144324A2 true EP1144324A2 (fr) 2001-10-17

Family

ID=22354805

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99972023A Withdrawn EP1144324A2 (fr) 1998-12-30 1999-12-09 Guide d'onde dope au tantale et son procede de fabrication

Country Status (7)

Country Link
EP (1) EP1144324A2 (fr)
JP (1) JP2002533295A (fr)
CN (1) CN1332703A (fr)
AU (1) AU3996700A (fr)
CA (1) CA2357777A1 (fr)
TW (1) TW421724B (fr)
WO (1) WO2000039039A2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004049996A1 (de) * 2004-10-14 2006-04-20 Merck Patent Gmbh Aufdampfmaterial zur Herstellung hochbrechender Schichten
US7095941B2 (en) 2004-10-27 2006-08-22 Schott Corporation Fused optical fiber optical device system
CN106125449B (zh) * 2016-06-30 2021-04-06 派尼尔科技（天津）有限公司 一种具有铒掺杂氧化钽脊形结构的波导放大器制备方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4251251A (en) * 1979-05-31 1981-02-17 Corning Glass Works Method of making optical devices
WO1998000739A1 (fr) * 1996-07-01 1998-01-08 Corning Incorporated Fibre optique a chemisage dope au tantale

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3659915A (en) * 1970-05-11 1972-05-02 Corning Glass Works Fused silica optical waveguide
US3806570A (en) * 1972-03-30 1974-04-23 Corning Glass Works Method for producing high quality fused silica
US3785722A (en) * 1972-06-20 1974-01-15 Corning Glass Works USE OF SiO{11 -NB{11 O{11 {11 AND/OR Ta{11 O{11 {11 GLASSES AS ULTRAVIOLET FILTERS
FR2333628A1 (fr) * 1975-12-01 1977-07-01 Vergnon Pierre Procede et equipement pour la production de preformes de fibres optiques
JPS59227741A (ja) * 1983-06-10 1984-12-21 Hitachi Ltd 耐放射線光フアイバ
JPS59227740A (ja) * 1983-06-10 1984-12-21 Hitachi Ltd 光フアイバ母材ガラスおよびその製造方法
US4666247A (en) * 1985-02-08 1987-05-19 American Telephone And Telegraph Company, At&T Bell Laboratories Multiconstituent optical fiber

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4251251A (en) * 1979-05-31 1981-02-17 Corning Glass Works Method of making optical devices
WO1998000739A1 (fr) * 1996-07-01 1998-01-08 Corning Incorporated Fibre optique a chemisage dope au tantale

Also Published As

Publication number Publication date
TW421724B (en) 2001-02-11
JP2002533295A (ja) 2002-10-08
WO2000039039A3 (fr) 2000-11-09
AU3996700A (en) 2000-07-31
WO2000039039A2 (fr) 2000-07-06
CA2357777A1 (fr) 2000-07-06
CN1332703A (zh) 2002-01-23

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Effective date: 20040701