Continuous prodn. of blank for mfg. optical waveguide fibres - where gas streams contg. silicon halide(s) and dopants are oxidised in furnace to form blank by chemical vapour deposition

The blank has a transverse profile of refractive index (RI), and is drawn continuously out of a furnace, in which the concave top surface (PO) of the blank (PF) is located below a nozzle. The nozzle has an outlets spraying in overlapping gas streams onto the growing surface (PO), where the streams are oxidised and form a deposit on the surface (PO); and either the nozzle and/or the blank are rotated. The pref. appts. contains a nozzle with >3 outlets forming concentric ring deposits on surface (PO), which is inside an outer sheath formed by quartz rings. The gas streams are converted by CVD to oxide mixts. contg. different amts. of SiO2, B2O3, Sb2O3, P2O5, GeO2, so the required RI profile is obtd.

PYROLYTIC PROCESS

OPTICAL FIBER MANUFACTURE

J. Irven-14-11- (Revision) A vapor reaction deposition process is used to form a localized deposit upon the end face of a rod wherein by means of relative movement the position of the localized deposit is scanned over the end face of the rod and at the same time the reaction is progressively changed so as to cause the deposit building up on the end face to have a radially graded refractive index profile. SBG/mmg Date: May 2, 1979 ...

APPARATUS AND METHOD FOR MAKING AN OPTICAL FIBER PREFORM

An apparatus is provided for applying a tensile force along the longitudinal axis of a cane assembly during the deposition of soot thereon to produce an optical fiber preform. Fiber drawn from such a preform exhibits improved core/clad concentricity. The tensile force may be applied at one or both ends of the cane assembly, with application at both ends being preferred. The tensile force may he varied during the deposition of soot. The cane assembly may be annealed prior to beginning the deposition of soot thereon.

METHOD FOR HEATING GLASS BODY

The present invention is directed to a method of heating a glass body which comprises heating a part of the glass body with relative movement of the glass body and a heating source, wherein an inert gas is blown from an inert gas-blowing means onto the surface of the glass body near a heated part of the glass body. This method prevents the redeposition of glass particles and is particularly useful for fine polishing or cleaning, or for heating and stretching a glass preform for an optical fiber.

Process for the production of glass fibre optical waveguides

METHOD FOR MANUFACTURING AN OPTICAL FIBRE

Fiber optical waveguide simply oriented in dispersion and process of making same

Fibra de guia de onda ótica de modo simples orientada em dispersão e processo de fabricação da mesma

Method for manufacturing an article comprising a refractory dielectric body

Method for manufacturing a glass doped with a rare earth element and fiber for optical amplification using the same

An optical fiber for optical amplification, characterized in that a full width at half maximum of gain spectrum is 45 nm or more; and a maximum value of power conversion efficiency is 80% or more. A method for producing a rare earth element-doped glass for use in manufacturing the optical fiber, which comprises a deposition step of depositing fine silica glass particles and a co-dopant (a) to prepare an aggregate of fine silica glass particles doped with the co-dopant (a); and a immersion step of immersing the aggregate of fine silica glass particles prepared in the deposition step in a solution containing the rare earth element and the co-dopant (b) to thereby dope the aggregate of fine silica glass particles with the rare earth element component and the co-dopant (b).

PLASMA DEPOSITION PROCESS FOR PRODUCING AN OPTICAL PREFORM WITH A CLADDING GLASS LAYER OF FLUORINE-DOPED QUARTZ GLASS

In plasma deposition processes for producing an optical preform according to the POD method, a cladding glass layer composed of fluorine-doped quartz glass is produced by means of a plasma torch on a cylindrical substrate body composed of quartz glass, said substrate body rotating about the longitudinal axis thereof. In this case, the plasma torch performs a reversing relative movement between two turning points (A; B) along the substrate body. In order, proceeding therefrom, to achieve a high fluorine doping in conjunction with a dopant distribution that is as uniform as possible axially, the invention proposes that a heat element has a heating effect on the region of one turning point (A; B) when the plasma torch is situated in the region of the other turning point (B; A). 1. A plasma deposition process for producing an optical preform having a cladding glass layer of fluorine-doped quartz glass , said method comprising:{'sub': '2', 'forming SiOparticles with a plasma torch in the presence of fluorine, and'}{'sub': '2', 'depositing said SiOparticles layer by layer on an outer surface of a cylindrical substrate body of quartz glass rotating about a longitudinal axis thereof, and'}{'sub': '2', 'c) vitrifying said SiOparticles so as to form the cladding glass layer,'}the plasma torch and the substrate body being moved relative to each other such that the plasma torch reversingly moves between first and second turning points along the substrate body, andwherein a thermal element thermally acts on an area of the first turning point when the plasma torch is positioned in an area of the second turning point.2. The deposition process according to claim 1 , wherein the thermal element acts less on the area of the first turning point the farther away the plasma torch is from the second turning point.3. The deposition process according to claim 2 , wherein whenever the plasma torch is positioned in the area of the first turning point claim 2 , the thermal element does not ...

OPTICAL DEVICE AND MANUFACTURE

Optical device and preform fabrication

A method of fabricating an optical device having a prescribed refractive index profile, comprises forming a surface with an initial refractive index formation and altering it by directing a laser beam onto the surface, either as it is formed or afterwards, so as to selectively evaporate material from a predetermined part of the surface. The refractive index profile of a growing soot form fabricated by the axial vapor deposition method is altered by evaporating the index modifying dopant from selected portion of the form. In an illustrative embodiment of the invention described, a laser beam (17) is used to "write" the desired pattern on the growing form (10). The technique can be employed to fabricate optical fiber preforms as well as two and three dimensional integrated optical devices and circuits. ...

Method of manufacturing single-mode optical fiber preform

DISPERSION MANAGED OPTICAL WAVEGUIDE

A single-mode optical waveguide fiber designed to limit power penalty due to four wave mixing and a method of making the waveguide is disclosed. Variations in properties, e.g., radius or refractive index, of the waveguide fiber core provide a total dispersion which varies along the length of the waveguide. The algebraic sum of products of length times total dispersion is controlled to a pre-selected value for each waveguide fiber which makes up a system link. Proper choice of total dispersion variation magnitude and sub-length results in a system link wherein a signal travels only short distances in waveguide portions having total dispersion near zero. However, the variation of the total dispersion provides a system link which has a pre-selected dispersive effect on the signal over a selected wavelength range. The dispersive effect on the signal can be chosen to be essentially zero. A number of techniques for fabricating DM fiber are also disclosed.

PLASMA DEPOSITION PROCESS FOR PRODUCING AN OPTICAL PREFORM WITH A CLADDING GLASS LAYER COMPOSED OF FLUORINE-DOPED QUARTZ GLASS

In plasma deposition processes for producing an optical preform according to the POD method, a cladding glass layer composed of fluorine-doped quartz glass is produced by means of a plasma torch on a cylindrical substrate body composed of quartz glass, said substrate body rotating about the longitudinal axis thereof. In this case, the plasma torch performs a reversing relative movement between two turning points (A; B) along the substrate body. In order, proceeding therefrom, to achieve a high fluorine doping in conjunction with a dopant distribution that is as uniform as possible axially, the invention proposes that a heat element has a heating effect on the region of one turning point (A; B) when the plasma torch is situated in the region of the other turning point (B; A).

PRODUCTION OF PERFORMED BASE MATERIAL FOR OPTICAL FIBER

PURPOSE: To diminish a density difference and to decrease foreign matter and bubbles in an OVD method by respectively independently providing a burner for deposition and a burner for controlling the density of the deposited base material and adjusting the density to a prescribed average deposition density. CONSTITUTION: The porous glass base material 4 is deposited on the outer periphery of a glass rod 1 for a core and is sintered to form transparent glass. The burner 2 for deposition of the porous glass and the burner for controlling the density of the deposited base material (for example, oxyhydrogen flame burner 5) are provided respectively independently in this CVD method. The flame 6 of the above-mentioned burner 5 is blown at all times and the density difference of the porous glass base material 4 formed by the deposition of the fine silica glass particles generated from the above-mentioned burner 2 is adjusted. COPYRIGHT: (C)1993,JPO&Japio ...

ОДНОМОДОВЫЙ ВОЛОКОННО-ОПТИЧЕСКИЙ ВОЛНОВОД С УПРАВЛЯЕМОЙ ДИСПЕРСИЕЙ И СПОСОБ ЕГО ИЗГОТОВЛЕНИЯ (ВАРИАНТЫ)

Одномодовый волновод предназначен для уменьшения энергетических потерь из-за четырехволнового смешения. Волновод содержит область стеклянной сердцевины, имеющую профиль распределения показателя преломления и окруженную слоем стеклянной оболочки, который имеет показатель преломления nc меньший, чем по меньшей мере часть профиля распределения показателя преломления указанной области стеклянной сердцевины. Волновод включает множество участков вдоль своей длины и имеет изменяющуюся полную дисперсию, которая в заранее заданном диапазоне длин волн меняет знак от положительной к отрицательной и от отрицательной к положительной от одного участка к другому вдоль длины волновода. Изменяющаяся полная дисперсия включает по меньшей мере первую полную дисперсию Di одного знака на некоторых участках и вторую полную дисперсию Dj противоположного знака на других участках, каждый участок состоит из сегментов ( dli, dlj). Каждый сегмент имеет соответствующую по существу постоянную полную дисперсию (Di, Dj ...

Apparatus and method for making an optical fiber preform

A PREFORM AND METHOD FOR MANUFACTURING SAME

In respect of a method for manufacturing a preform of an optical fiber, the method comprises the steps of forming a porous glass preform by accumulating glass particles, preparing a container made of a quartz glass, which is formed by heating the quartz glass with an electric furnace, providing a dehydration gas and an inert gas to the container, heating the container to which dehydration gas and inert gas is provided and dehydrating and sintering the porous glass preform by inserting the porous glass preform into the container, which is heated.

OPTICAL FIBER FABRICATION PROCESS

PRODUCTION OF PREFORM FOR OPTICAL FIBER

PROBLEM TO BE SOLVED: To provide a method for producing a preform for an optical fiber capable of providing an optical fiber having a slight transmission loss without causing soot cracking. SOLUTION: This method comprises connecting both ends or one end of a core preform composed of a core or a part of the core and a clad to dummy rods 2, carrying out the flame polishing of the surface of the core preform with a burner 3 for flame polishing, then synthesizing a porous clad glass on the outer periphery of the core preform containing the dummy rods 2, forming a composite preform of the core preform and the porous clad glass, heat-treating the composite preform and thereby producing a transparent preform for an optical fiber. In this case, the difference between the outside diameter of the core preform and the outside diameter of the dummy rods 2 connected to the core preform is ≤2 mm. COPYRIGHT: (C)1999,JPO ...

PREPARATION OF PARENT MATERIAL FOR OPTICAL FIBER

PURPOSE: To prepare the titled parent material having uniform quality in the axial direction at high growing rate by growing a porous parent material by the VAD process while making temp. distribution of the surface at an end of the growth side uniform by heating the neighbourhood of the growth end of the porous parent material with a heater. CONSTITUTION: A quartz glass rod 12 is inserted into a reaction vessel 11 and starting material gas is blown from a flame burner 13 to a foot end to desposit sooty fine glass particles. Said glass rod 12 is pulled upward while being revolved. Sooty fine glass particles deposit to the glass rod in the axial direction, allowing continuous growth of the porous parent material 14 comprising the sooty fine glass particles. At this stage, the neighbourhood of the growth end of the porous parent material 14 is heated with a heater 15. Thus, the temp. distribution near the growth end of the porous parent material 14 is made uniform, and the temp. distribution ...

SURFACE TREATMENT FOR REFRACTORY DIELECTRIC BODY

PURPOSE: To obtain a dielectric body product high in strength and low in loss by bringing a plasma fireball generated by a plasma torch into contact with a produced refractory dielectric body to vaporize a part of components, thereby removing the defect and eccentricity of surface. CONSTITUTION: The refractory dielectric body 20 (e.g. optical fiber preform consisting of silica gel) is produced and rotatably attached onto a lathe 21. The plasma torch 10 is arranged above the lathe 21 to supply an electrically discharging gas source 17 into a mantle 11 to be excited by an RF coil 19 and an RF generator 14 to generate plasma. In addition, electromagnetic energy for maintaining plasma is combined by the torch 10 to generate the plasma fireball 12. Next, this fireball 12 is moved by the introduction of an added gas source 18 and brought into contact with the rotating refractory dielectric body 20 to evaporate remove a part of the component, thereby removing the defect and eccentricity of the ...

СПОСОБ ИЗГОТОВЛЕНИЯ ЗАГОТОВКИ ОПТИЧЕСКОГО ВОЛОКНА

Изобретение относится к способу изготовления заготовки, которую используют для изготовления оптического волокна. На внешнюю периферийную часть исходного материала цилиндрической формы, который снабжен сердцевиной, выполненной из стекла, осуществляют осаждение частиц стекла в радиальном направлении, посредством чего формируют пористый слой, образующий собой пористое вещество, из которого впоследствии формируют оптическое волокно, и осуществляют спекание пористого вещества для изготовления указанной заготовки оптического волокна. Непосредственно перед операцией формирования указанного пористого слоя осуществляют операцию нагрева, при которой осуществляют нагрев поверхности исходного материала. Обеспечено получение заготовки оптического волокна, которая не имеет таких дефектов, как сдвиг и отслоение сердцевины от области оболочки. 1 з.п.ф-лы, 1 табл., 1 ил.

Vorrichtung und Verfahren zum Herstellen eines Rußabscheidungskörpers

Durch die vorliegende Erfindung wird eine Vorrichtung zum Herstellen eines Rußabscheidungskörpers bereitgestellt, mit: einem Hauptbrenner, der Glasmikropartikel auf einer Target-Stange abscheidet, während er sich parallel zu einer Längsrichtung der Target-Stange bewegt, und einem Seitenbrenner, der in einer Bewegungsrichtung des Hauptbrenners außerhalb eines Bewegungsbereichs des Hauptbrenners angeordnet ist und einen Endabschnitt des auf der Target-Stange ausgebildeten Rußabscheidungskörpers befeuert. Der Seitenbrenner weist mehrere Heizbrenner auf, die in der Umfangsrichtung der Target-Stange voneinander beabstandet angeordnet sind. In der vorstehend beschriebenen Herstellungsvorrichtung kann der Hauptbrenner mehrere Abscheidungsbrenner aufweisen, die in der Umfangsrichtung der Target-Stange voneinander beabstandet angeordnet sind.

PLASMAVERFAHREN ZUR HERSTELLUNG EINES DIELEKTRISCHEN STABES

PYROLYTIC PROCESS FOR PRODUCING FUSED SILICON DIOXIDE CYLINDRICAL BODY

VERFARHREN FOR MANUFACTURING A GLASS GATHERING MOLD FOR OPTICAL FIBERS BY SEPARATION FROM THE VAPOR PHASE

PROCESS FOR PRODUCING GLASS PREFORM FOR OPTICAL FIBER

A process for producing a porous glass preform for optical fiber by depositing fine glass particles on an outer surface of a glass material while moving the glass material, including the steps of: preheating a portion of the glass material to clean the portion of the glass material in an apparatus for depositing fine glass particles; and depositing fine glass particles on the portion of the glass material cleaned by the preheating, in the apparatus for depositing fine glass particles.

PREFORM MANUFACTURING METHOD AND PREFORM

PURPOSE: To provide a method for manufacturing a preform having a small content of hydroxyl groups. CONSTITUTION: The method is a manufacturing method for a preform, the base material for an optical fiber. The method comprises a porous glass preform forming step wherein the porous glass preform is formed by depositing fine glass particles, a container preparing step wherein a quartz glass container formed by heating quartz glass with an electric furnace is prepared, a gas introducing step wherein a dehydration reaction gas and an inert gas is introduced into the container, a heating step wherein the container into which the dehydration reaction gas and the inert gas is introduced is heated, and a dehydration sintering step wherein the porous glass preform is dehydrated and sintered by inserting the preform into the heated container. © KIPO & JPO 2004 ...

Apparatus for applying tension to a fiber preform during soot deposition

An apparatus is provided for applying a tensile force along the longitudinal axis of a cane assembly during the deposition of soot thereon to produce an optical fiber preform. Fiber drawn from such a preform exhibits improved core/clad concentricity. The tensile force may be applied at one or both ends of the cane assembly, with application at both ends being preferred. The tensile force may be varied during the deposition of soot. The cane assembly may be annealed prior to beginning the deposition of soot thereon.

PREFORM MANUFACTURING METHOD AND PREFORM

PROBLEM TO BE SOLVED: To provide a method for manufacturing a preform having a small content of hydroxyl groups. SOLUTION: The method is a manufacturing method for a preform, the base material for an optical fiber. The method comprises a porous glass preform forming step wherein the porous glass preform is formed by depositing fine glass particles, a container preparing step wherein a quartz glass container formed by heating quartz glass with an electric furnace is prepared, a gas introducing step wherein a dehydration reaction gas and an inert gas is introduced into the container, a heating step wherein the container into which the dehydration reaction gas and the inert gas is introduced is heated, and a dehydration sintering step wherein the porous glass preform is dehydrated and sintered by inserting the preform into the heated container. COPYRIGHT: (C)2004,JPO ...

Verfahren zur Herstellung eines Gegenstands mit eingeschlossenem feuerfestem dielektrischem Teil

Verfahren zum Erhitzen eines Glaskörpers.

METHOD AND APPARATUSFOR MASS PRODUCING FIBRE OPTIC PREFORMS AND OPTICAL FIBRES

FLUORINE DOPING A SOOT PREFORM

Method of manufacturing single-mode optical fiber preform

OPTICAL FIBRES

METHOD FOR FORMING CONTINUOUS, WITHOUT INTERNAL SUPPORT, OF A HOLLOW CYLINDRICAL BODY OF SOOT, SERVING AS A PREFORM FOR MANUFACTURING OPTICAL FIBER.

TITANIUM-DOPED QUARTZ CRYSTAL RODS

MANUFACTORING PROCESS OF PREFORM AND OPTICAL DEVICE CORRESPONDING

L'INVENTION CONCERNE LA TECHNOLOGIE DES DISPOSITIFS OPTIQUES INTEGRES. ON MODIFIE LE PROFIL D'INDICE DE REFRACTION D'UNE FORME DE SUIE EN CROISSANCE FABRIQUEE PAR DEPOT AXIAL EN PHASE VAPEUR, EN EVAPORANT LE DOPANT DE MODIFICATION D'INDICE DANS UNE PARTIE SELECTIONNEE DE LA FORME. DANS UN EXEMPLE DE MISE EN OEUVRE, ON UTILISE UN FAISCEAU LASER17 POUR "ECRIRE" LE MOTIF DESIRE SUR LA FORME EN CROISSANCE10. APPLICATION A LA FABRICATION DE PREFORMES DE FIBRES OPTIQUES ET DE DISPOSITIFS OPTIQUES INTEGRES BIDIMENSIONNELS ET TRIDIMENSIONNELS. THE INVENTION CONCERNS THE TECHNOLOGY OF INTEGRATED OPTICAL DEVICES. THE REFRACTION INDEX PROFILE OF A GROWING SOOT FORM MANUFACTURED BY STEAM PHASE AXIAL DEPOSIT IS MODIFIED BY EVAPORATING THE INDEX MODIFICATION DOPANT IN A SELECTED PART OF THE FORM. IN AN EXAMPLE OF IMPLEMENTATION, A LASER BEAM 17 IS USED TO "WRITE" THE DESIRED PATTERN ON THE GROWING SHAPE10. APPLICATION TO THE MANUFACTURING OF OPTICAL FIBER PREFORMS AND BIDIMENSIONAL AND THREE-DIMENSIONAL INTEGRATED OPTICAL DEVICES.

Optical fiber fabrication process

Glass tubes which form an integral part of optical fiber preforms from which optical fibers are drawn are fabricated from tubular structures comprising amorphous powdery particles. The tubular structures are heated so as to fuse the particles thereby yielding a transparent tubular glass structure of optical fiber quality. During the fusing step, the structure is substantially constrained against shrinkage in both the radial and longitudinal direction thereby yielding a glass tube with improved dimensional characteristics.

Dispersion managed optical waveguide

Method and apparatus for combustion-enhanced vaporization

PROCESS FOR Continuing education, WITHOUT INTERNAL SUPPORT, Of a HOLLOW CYLINDRICAL SOOT BODY, BEING USED AS PREFORM FOR the MANUFACTURE OF Fiberoptics.

METHOD FOR MANUFACTURING AN OPTICAL FIBRE

A method for manufacturing a glass core rod and a cladding layer clothing the glass core rod applied successively or continuously by using a carbon dioxide gas laser. A refractory mandrel is heated by means of carbon dioxide gas laser irradiation and a mixed gas of oxygen and pure silicon tetrachloride vapor and a dopant compound vapor is ejected to the refractory mandrel so as to deposit silicon oxide and oxide of the dopant compound on the mandrel and to form a glass core by fusing it. Further heating is applied by irradiation by the carbon dioxide laser beam on the glass core and a mixed gas oxygen and pure silicon tetrachloride vapor and a dopant compound vapor or of oxygen gas and pure silicon tetrachloride vapor to deposit silicon oxide and oxide of the dopant compound or silicon oxide on the glass core to form a cladding layer of fused silica or fused silica containing the dopant. The preform thus formed by the glass core and the cladding is heated above the softening temperature of the preform so as to spin to form an optical fibre. The method uses laser beam heating which results in less degree of contaminating impurity and water content which might cause absorption and scattering of light also to manufacture an optical fiber having less variation at the boundary of the glass core and the cladding layer.

PROCEDE DE FABRICATION DE PREFORME ET DISPOSITIF OPTIQUE CORRESPONDANT

L'INVENTION CONCERNE LA TECHNOLOGIE DES DISPOSITIFS OPTIQUES INTEGRES. ON MODIFIE LE PROFIL D'INDICE DE REFRACTION D'UNE FORME DE SUIE EN CROISSANCE FABRIQUEE PAR DEPOT AXIAL EN PHASE VAPEUR, EN EVAPORANT LE DOPANT DE MODIFICATION D'INDICE DANS UNE PARTIE SELECTIONNEE DE LA FORME. DANS UN EXEMPLE DE MISE EN OEUVRE, ON UTILISE UN FAISCEAU LASER17 POUR "ECRIRE" LE MOTIF DESIRE SUR LA FORME EN CROISSANCE10. APPLICATION A LA FABRICATION DE PREFORMES DE FIBRES OPTIQUES ET DE DISPOSITIFS OPTIQUES INTEGRES BIDIMENSIONNELS ET TRIDIMENSIONNELS.

VERFAHREN ZUR HERSTELLUNG VON GLASFASER-LICHTWELLENLEITERN

Process for producing glass preform for optical fiber

Plasma process for the production of a dielectric rod

A plasma process for the production of a dielectric rod 6 from gaseous starting materials, causes the rod 6 to grow in the axial direction by deposition on its end face. This is effected by conducting microwave energy via the rod 6 to its end face, this energy maintaining a gaseous discharge 7 at the end face. The starting material flows into this gaseous discharge as a gaseous jet by means of a concentric nozzle system 8.

Method and apparatus for modifying the transverse cross section of a body

The transverse cross section of a body is modified by the steps of: a) determining the extent to which the body has material in excess of a desired shape at a plurality of points, b) exposing the body to a local heat source having a temperature sufficiently high to remove material from the surface of the body, and c) moving the surface of the body in relation to the source at a speed which decreases in regions where the body has material in excess of the desired shape so as to remove more material from such regions than from other regions. In a preferred embodiment, the body is an optical fiber preform, the local heat source is the fireball of a plasma torch, and the body is moved relative to the torch by rotating the preform at a controllable angular velocity while the torch is translated along the length of the preform.

PRODUCTION OF OPTICAL FIBER

PURPOSE: To prevent entry of OH and enable high-speed etching, by subjecting the central member to specific flame polishing before a step for depositing fine glass powder onto the central member of glass. CONSTITUTION: For example, a central member 10 consisting of pure quartz glass rod, etc., to be a core when formed into an optical fiber is rotated to generate a plasma flame 12 with a plasma torch 14 having a high-frequency coil 16 for generating the plasma flame and a sealing gas 22 (an etching gas, such as SF6, as necessary, may be discharged from 1-2 of nozzles 20) consisting of an inert gas, such as N2, is simultaneously led from the many (e.g., 12) nozzles 20 arranged at a regular interval around the torch 14 is led to the plasma flame 12 and made to flow so as to wrap a high-temperature part 11 of the central member 10 heated with the plasma flame 12 and cut off the part from the outside air. Thereby, the high-temperature part is subjected to flame polishing. The torch and nozzles ...

Verfahren zum Erhitzen eines Glaskörpers.

METHOD FOR HEATING GLASS BODY

PROCESS FOR PRODUCING GLASS PREFORM FOR OPTICAL FIBER

A process for producing a porous glass preform for optical fiber by depositing fine glass particles on an outer surface of a glass material while moving the glass material, including the steps of: preheating a portion of the glass material to clean the portion of the glass material in an apparatus for depositing fine glass particles; and depositing fine glass particles on the portion of the glass material cleaned by the preheating, in the apparatus for depositing fine glass particles.

MANUFACTORING PROCESS OF PREFORM AND OPTICAL DEVICE CORRESPONDING

PROCEDE POUR LA FORMATION CONTINUE, SANS SUPPORT INTERNE, D'UN CORPS CYLINDRIQUE CREUX EN SUIE, SERVANT DE PREFORME POUR LA FABRICATION DE FIBRES OPTIQUES.

LE CORPS EN SUIE8 EST COMPOSE ESSENTIELLEMENT DE DIOXYDE DE SILICIUM. IL EST FORME DEBOUT, AU MOYEN D'AU MOINS UN BRULEUR D'HYDROLYSE1 POUR LA PRODUCTION DE SUIE. AU DEBUT DE LA FORMATION, LA SUIE EST DEPOSEE SUR UN CORPS AUXILIAIRE2, LEQUEL EST TOURNE PAR RAPPORT AU BRULEUR1 PENDANT LA FORMATION. L'ORIFICE DU BRULEUR DE FORMATION1 EST MAINTENU APPROXIMATIVEMENT AU MILIEU AU-DESSUS DE LA SECTION DROITE PREDETERMINEE DE L'EXTREMITE LIBRE - QUI CROIT VERS LE HAUT - DE LA PAROI CYLINDRIQUE8. ON EMPECHE LA PENETRATION DE SUIE DANS LA CAVITE AXIALE9 DU CYLINDRE AU MOYEN D'UN COURANT GAZEUX DIRIGE, PRODUIT NOTAMMENT PAR UN BRULEUR AUXILIAIRE10.

Apparatus for applying tension to a fiber preform during soot deposition

An apparatus is provided for applying a tensile force along the longitudinal axis of a cane assembly during the deposition of soot thereon to produce an optical fiber preform. Fiber drawn from such a preform exhibits improved core/clad concentricity. The tensile force may be applied at one or both ends of the cane assembly, with application at both ends being preferred. The tensile force may be varied during the deposition of soot. The cane assembly may be annealed prior to beginning the deposition of soot thereon.

APPARATUS AND METHOD FOR PRODUCING POROUS GLASS PREFORM

PROBLEM TO BE SOLVED: To provide an apparatus for producing porous glass perform, capable of preventing abrupt change in GeO2 concentration in cross section diameter direction of porous glass perform and simply and surely obtaining porous glass preform having desired characteristics. SOLUTION: This apparatus 1 for producing porous glass perform is equipped with a burner 12 for jetting flame F12 containing glass fine particles produced by feeding glass rod in which glass fine particles are deposited, a raw material gas containing SiCl4 and GeCl4 and fuel gas to the outer periphery of glass rod 4, a supporting member 14 for holding and rotating the glass rod 4, a burner-moving part 17 for relatively reciprocating the glass rod 4 and the burner 12 and a burner 13 jetting a flame F13 not containing GeO2 to the outer periphery of the glass rod 4 and arranged at the position at which flames F12 and F13 interfere. COPYRIGHT: (C)2001,JPO ...

ACCUMULATING METHOD FOR OXIDE POWDER FOR OPTICAL FIBER

PURPOSE: To accumulate oxide powder for an optical fiber with high efficiency in a high yield by using two heat sources; heating a powder adhering surface with one source; and utilizing the other source in diffusion control of the powder. CONSTITUTION: By use of heater 6 the inside of reactor 1 is heated to a temp. from the temp. of a flame for spraying starting material to the volatilization temp. of a dopant, and the starting material contg. glass components, the dopant, etc. and the oxyhydrogen flame adjusted to the reaction temp. of the material are sprayed from burner 5 upon powder adhering surface 4 of rotating rod 3 to adhesion-accumulate flame-hydrolyzed porous oxide powder A. Thus, the accumulation of powder A can be accelerated while preventing the dopant from vaporizing. COPYRIGHT: (C)1980,JPO&Japio ...

Verfahren zum Herstellen einer Vorform mittels einer Vorrichtung zur thermischen Behandlung

VERFARHREN ZUM HERSTELLEN EINER GLASVORFORM FÜR OPTISCHE FASERN DURCH ABSCHEIDUNG AUS DER DAMPFPHASE

Verfahren zur Herstellung einer Vorform aus Glas

OPTICAL DEVICE AND PREFORM FABRICATION

PLASMA DEPOSITION PROCESS FOR PRODUCING AN OPTICAL PREFORM WITH A CLADDING GLASS LAYER COMPOSED OF FLUORINE-DOPED QUARTZ GLASS

In plasma deposition processes for producing an optical preform according to the POD method, a cladding glass layer composed of fluorine-doped quartz glass is produced by means of a plasma torch on a cylindrical substrate body composed of quartz glass, said substrate body rotating about the longitudinal axis thereof. In this case, the plasma torch performs a reversing relative movement between two turning points (A; B) along the substrate body. In order, proceeding therefrom, to achieve a high fluorine doping in conjunction with a dopant distribution that is as uniform as possible axially, the invention proposes that a heat element has a heating effect on the region of one turning point (A; B) when the plasma torch is situated in the region of the other turning point (B; A).

PRODUCTION OF OPTICAL FIBER PREFORM DOPED WITH RARE EARTH ELEMENT

PURPOSE: To inhibit the crystallization and deposition of a rare earth element and to obtain an optical fiber preform doped with the rare earth element at high concn. by rotating a core glass rod doped with the rare earth element in the axial direction, etching the surface of the rod by a specified method, depositing fine glass particles on the etched surface and carrying out sintering. CONSTITUTION: A core glass rod 1 doped with a rare earth element is rotated in the axial direction, an etching gas is fed into a plasma jet flame 3 generated with a plasma torch 2 and this torch 2 is traversed plural times along the longitudinal direction of the rod 1 to etch the surface of the rod 1. At the time of the final traverse, the etching rate is reduced. Fine glass particles for a clad are then deposited on the etched surface of the rod 1 and sintered to obtain an optical fiber preform doped with the rare earth element. COPYRIGHT: (C)1991,JPO&Japio ...

Dispersionsgesteuerter optischer Wellenleiter

PYROLYTIC PROCESS FOR PRODUCING FUSED SILICON DIOXIDE CYLINDRICAL BODY

Disclosed is a method for the axial building up, in a vertical arrangement, of a hollow cylindrical soot body having no internal support and consisting substantially of silicon dioxide by means of at least one flame hydrolysis build-up burner serving for the soot production. In this method the soot is deposited at the beginning of the build-up onto an auxiliary body, and during the build-up the build-up burner and the growing soot body are rotated relative to one another, and the burner is at the same time held at an unvarying distance from the growing end of the hollow cylinder and centrally above the predetermined cross section of the upwardly growing end of the cylinder wall. The penetration of soot into the interior of the cylinder is prevented by means of a directed gas stream.

METHOD FOR MANUFACTURING AN OPTICAL FIBRE

... 1498907 Optical fibres NIPPON TELEGRAPH & TELEPHONE PUBLIC CORP 17 April 1975 [24 April 1974 30 April 1974] 15927/75 Heading C1M A method of manufacturing optical fibres comprises (a) forming a glass core rod 48 by heating rotatable and movable refractory mandrel 44 at 1600-1800‹ C. by irradiation with CO 2 laser beam 42; ejecting a gaseous mixture 47 of oxygen, the vapour of an oxidizable silicon compound and the vapour of a compound oxidizable to form a dopant oxide for SiO 2 , towards heated mandrel 44, so as to deposit SiO 2 and the dopant oxide thereon; and fusing the deposited oxides; (b) forming a glass cladding layer 55 on said core rod 48 by heating the rod surface at 1600-1800‹ C. by irradiation with CO 2 laser beam 51; ejecting a gaseous mixture 54 comprising oxygen and the vapour of an oxidizable silicon compound towards the surface of core rod 48, so as to deposit SiO 2 thereon; and fusing the deposited oxide; and (c) heating the core/cladding assembly to above the cladding ...

OPTICAL FIBRE MANUFACTURE

Dispersion managed optical waveguide

OPTICAL FIBER MANUFACTURE

METHOD AND DEVICE FOR FABRICATING POROUS OPTICAL FIBER PREFORM, WHICH CARRY OUT ALL STEPS IN DEPOSITION FURNACE TO OBTAIN SINTER

PURPOSE: Provided are a method and a device for fabricating a porous optical fiber preform, which carry out all the steps in a deposition furnace of the device to obtain sinter, save fabrication time of an optical fiber preform and increase production. CONSTITUTION: The porous optical fiber preform is fabricated by the steps of: fixing both ends of the many soot rods(129) to the rotating discs(102) wherein the soot rods(129) are placed around the rotating discs(102) at a certain interval and each of which is installed at the upper and lower ends of a deposition furnace(101); supplying gas-phase raw materials to the deposition furnace(101) with rotating the rotating discs(102) centering around a rotating axis(121) extended in the longitudinal direction of the soot rods(129); completing deposition of raw materials on the soot rods(129) to form silica soot, prior to removing the soot rods(129) from the silica soots; and sintering the detached silica soots. © KIPO 2006 ...

Preform and manufacturing method thereof

A method for manufacturing the base material of fibers (perform) is provided to produce a perform with little OH radical. The method is provided with following steps: depositing glass particle to form porous glass base material; preparing container that is formed by heating quartz glass with electrical oven; heating the container that is filled with dehydration reaction gas and inert gas; and inserting a porous glass base material into the heated container to dehydrate and sinter the porous glass base material.

Manufacturing method for optical fiber preform

An object of this manufacturing method for an optical fiber preform is to provide an optical fiber preform which has no defects such as shearing and stripping between the core and the cladding region. The above object can be achieved by providing the manufacturing method for optical fiber preform, involving depositing glass particles in the radial direction on an outer peripheral portion of a cylindrical starting material provided with glass material which forms a core, thereby forming a porous layer to form an optical fiber precursor porous material, and sintering the porous material to manufacture an optical fiber preform, wherein a heating step for heating the surface of the starting material is provided adjacently before a step for forming the porous layer.

PRODUCTION OF PREFORM FOR OPTICAL FIBER

PROBLEM TO BE SOLVED: To prevent crack formation in a preform for an optical fiber during its production or in the following process. SOLUTION: This is a method for producing a preform 4 for an optical fiber by ejecting a glass raw material from an accumulation burner 31, producing glass fine particles by flame hydrolysis and blowing them on a starting member 2 to accumulate. In the method, heating burners 32a, 32b are placed adjacently to the accumulation burner 31. These burners heat the accumulated areas 42 of the glass fine particles during the accumulation of the glass fine particles at a temperature the same as or higher than that of the accumulated area 41 which is heated by the accumulation burner 31 in terms of surface temperature. COPYRIGHT: (C)1997,JPO ...

PRODUCTION OF OPTICAL FIBER PREFORM

PURPOSE:To prevent the deflection of the axial center and to produce the title preform free of defects by blowing a gaseous chemical etchant onto a glass rod with the lower part mechanically supported to remove cracks, and then depositing fine glass particles on the rod. CONSTITUTION:The glass rod 1 with the upper end supported by a rotary chuck 2 connected to a lifting shaft is allowed to vertically pierce a reaction vessel 3 provided with a cleaning chamber 6 at the lower part, and a mechanical supporting means for preventing the whirling of the glass rod 1 is provided below the chamber 6. The glass rod 1 is rotated through the chuck 2 and lifted up, a gaseous chemical etchant (e.g., SF6) is blown from a nozzle 7 onto the glass rod 1 in the chamber 6 to clean the surface, the rod 1 is then introduced into the vessel 3, a synthesis gas is supplied from a burner 4, the fine glass particles synthesized in an oxyhydrogen flame are deposited on the surface of the glass rod 1, and a porous ...

PLASMA TORCH AND PRODUCTION OF GLASS BASE MATERIAL FOR OPTICAL FIBER BY USING SAID PLASMA TORCH

PURPOSE: To facilitate the start of the electric discharge of plasma and to decrease the high-frequency power for sustaining the plasma by preheating a gas for generating the plasma on the upper stream side of a plasma torch formed by disposing a high-frequency induction coil to the outside of a quartz glass tube. CONSTITUTION: The high-frequency induction coil 5 is concentrically disposed to the outside of the quartz glass tube 7 and the gas for generating the plasma is fed from a supply hole 7a into the tube to generate a plasma flame 6 from an aperture end 7b. Oxyhydrogen burners 8 are provided to the upper stream side of the quartz glass tube 7 of the above-mentioned plasma torch 1A to preheat the above-mentioned gas for generating the plasma. The easy start of the discharge of the plasma at a low voltage is thereby permitted and the high-frequency power for sustaining the stable plasma is decreased, by which the size of an oscillator is reduced and the equipment is simplified. A heat ...

OPTICAL FIBRE MANUFACTURE

In order to produce an optical waveguide (46) having a gradient profile of the refractive index from a preform (43), glass material is precipitated continuously from a chemical vapour-phase reaction, first on a rotating baseplate and subsequently on the front face of the preform (43) being formed, where the precipitation is carried out by a burner nozzle (jet, head) (40), through which the reactants are fed in gas form. The feeding of the reactants and the movement of the nozzle transversely to the rotating front face of the preform are controlled in such a way that the desired gradient profile of the refractive index is obtained. The front face is kept at a constant distance from the burner by moving the preform away depending on the deposition rate of the glass material onto the front face. The end of the preform opposite to the front face is re-heated during this operation in order to draw the optical waveguide (46) from this end; the process thus involves continuous production of the waveguide. <IMAGE>

TITANIUM-DOPED QUARTZ CRYSTAL RODS

... 1389112 Silicon dioxide filaments SIEMENS AG 21 Sept 1972 [29 Nov 1971] 43708/72 Heading C1A A titanium doped quartz crystal rod is produced by passage of a gas mixture, from which silicon dioxide and titanium dioxide can be deposited by decomposition of the gas mixture by heating, over an electrically heated filament of pure silicon upon which the SiO 2 and TiO 2 is deposited. The composition of the gas mixture which comprises silicon and titanium alcoholates or silicon and titanium tetrachlorides may be varied during the course of the process to produce a predetermined refractive index profile. From the titanium doped quartz rod so produced, optical fibres can be drawn in an oxidizing atmosphere to convert the inner silicon filament core into SiO 2 .

Photoconductor having radially decreasing refractive index - formed on heated rotating glass rod using heat decomposing gases

At least 2 co-axial gas-streams of gaseous cpds. having different compsn. are directed onto front surface of a glass-rod, heated to a high temp. by at least one heat-source. The glass rod is moved along its longitudinal axis in accordance with growth rate of a layer of photoconductor material forming through decompsn. of gaseous cpds. Glass-rod movement is such that the distance between the front surface and the gas supply pipe outlet orifices remains constant. Used as transmitting media in wide-band optical signalling. Refractive index profile is formed in one step.

OPTICAL FIBRE MANUFACTURE

Method of making optical fibers

An optical fiber having optical characteristics that vary along its length is made by assembling a plurality of cylindrical glass or soot tablets into or along a glass tablet alignment device, then fused into monolithic assembly. If desired, additional glass may be applied to the assembly before or after the fusing step. A vacuum is preferably applied during the fusing step. Each tablet preferably contains a core region, and it optionally contains a layer of cladding glass. Adjacent tablets are capable of forming optical fiber sections having different optical properties. Prior to consolidating the glass particles, chlorine preferably flows through or around the tablets and alignment device. The resultant draw blank can be drawn into a low loss optical fiber having short transition regions between adjacent areas of fiber. This method is particularly useful for making dispersion managed single-mode optical fibers.

MANUFACUTRE OF OPTICAL FIBER PREFORM

PURPOSE: To enable the manufacture of a long optical fiber preform having wide transmission range independent to its outer diameter, by applying a porous glass layer and a glass layer successively to the outer circumference of a target, and removing the porous glass and the target therefrom. CONSTITUTION: The glass lathe 5 is reciprocated on the bed 6 along the direction of the arrow B, and the target 1 of the glass lathe 5 is rotated. The outer circumference of the target 1 is firepolished with oxygen plasma flame of the plasma torch 4. SiCl4 is supplied from the raw material gas inlet pipe 7 with oxygen gas carrier, and a porous glass layer 2 having a thickness of about 1mm is applied to the surface of the target 1. Thereafter, a glass layer 3 having an outer diameter of about 15mm is applied to the porous glass layer 2 by supplying SiF4 through the pipe 7 at a rate controlled according to the outer diameter of the formed preform measured by the monitor 8 while keeping the flow rate of ...

DISTRIBUTED MANAGEMENT SINGLE MODE LIGHT WAVEGUIDE FIBER AND ITS MANUFACTURE

PROBLEM TO BE SOLVED: To provide a single mode light waveguide fiber designed to restrict a power penalty due to four optics mixtures and a manufacturing method of that waveguide. SOLUTION: A characteristic change such as radius (diameter 83, 84) or refractive index, for example, of a waveguide fiber core gives all divergence along the length of a waveguide. An algebraic summation of multiples of the length and all divergence is controlled to a pre-selected value toward each waveguide constituting a system link. When the size and the small length part of the change of all divergence is properly selected, a system link with which a signal advances by a short distance in a waveguide part having all divergence close to zero is obtained. However, the change of all divergence gives the system link generating a distributed effect pre-selected for the signals in the wavelength range pre-selected. The distributed effect against the signals can be selected to be substantially zero. A veriety of ...

OPTICAL DEVICE AND PREFORM FABRICATION

Process for producing glass preform for optical fiber

MANUFACTURING OPTICAL FIBRE

OPTICAL FIBER PREFORM HAVING LARGE SIZE SOOT POROUS BODY AND ITS METHOD OF PREPARATION

A method for producing an optical fiber preform having a large size soot porous body is provided wherein opposite ends of the rod are heated by heating means to achieve a predetermined temperature which is increased in a controlled manner in a stepwise mode or a gradual mode or a non-linear mode by varying flow rate and/or ratio of oxyhydrogen gases to heating means to achieve a particular temperature and soot porous body of desired diameter. In one embodiment, the predetermined temperature is increased to achieve a particular temperature and an intermediate diameter of soot porous body, wherein the particular temperature is optionally maintained till a soot porous body of a desired diameter is produced which is subjected to sintering process to produce the optical fiber preform having a large size soot porous body.

Method for manufacturing a glass doped with a rare earth element and fiber for optical amplification using the same

An optical fiber for optical amplification, characterized in that a full width at half maximum of gain spectrum is 45 nm or more; and a maximum value of power conversion efficiency is 80% or more. A method for producing a rare earth element-doped glass for use in manufacturing the optical fiber, which comprises a deposition step of depositing fine silica glass particles and a co-dopant (a) to prepare an aggregate of fine silica glass particles doped with the co-dopant (a); and a immersion step of immersing the aggregate of fine silica glass particles prepared in the deposition step in a solution containing the rare earth element and the co-dopant (b) to thereby dope the aggregate of fine silica glass particles with the rare earth element component and the co-dopant (b).

Apparatus and process for automatic control of the production of optical fiber

Apparatus and process for automatic control of the production of optical fiber are disclosed. The process comprises continuously depositing and sintering borosilicate glass particles on a fused silica rod or a graded index rod in such a manner that the glass exhibits a uniform, radially increasing concentration of boron. The appropriate boron oxide/silica concentration ratio in the glass particles is controlled by the time of deposit and the weight and diameter of the rod, which are continuously monitored. The concentration of boron oxide and silica in the particulate is likewise continuously monitored to insure that the correct portion of boron oxide/silica is deposited. The apparatus for conducting the process, includes means for continuously monitoring the weight and diameter of the rod and the boron oxide content of the glass particles and means for automatically regulating the equipment used to produce the optical fiber in response to readings from the monitoring means.

PRODUCTION OF BASE MATERIAL FOR OPTICAL FIBER

PURPOSE: To reduce a transitional part and a transitional time in the early stage when a porous glass base material for an optical fiber is manufactured by a VAD method, by heating a starting member with a heat source other than a burner for synthesizing fine glass particles before depositing fine glass particles on the starting member. CONSTITUTION: When a porous glass base material for an optical fiber is produced by a VAD method, the surface of a starting member 2 is heated to about 1,200°C with an oxyhydrogen burner 6 which is not used as a burner 1 for synthesizing fine glass particles. Starting materials for glass are then fed to the burner 1 to start the deposition of fine glass particles 4, and at the same time, the oxyhydrogen burner 6 is moved backward. The starting member 2 is required to have ≥20mm outside diameter. COPYRIGHT: (C)1985,JPO&Japio ...

Porous glass base material thermal insulating member and sintering method

In order to prevent thermal deformation of a thermal insulating board and scattering of radiant heat when sintering porous glass base material, provided is a thermal insulating member is arranged on a dummy rod above a porous glass base material, which is formed by depositing glass fine particles on the outside of a starting member formed by connecting the dummy rod to at least one end of a core rod, when heating the porous glass base material to achieve sintering. The thermal insulating member comprises a cylindrical insulating cylinder; an insulating upper board connected to a top end of the insulating cylinder; an insulating lower board connected to a bottom end of the insulating cylinder; and a thermal deformation preventing member that prevents thermal deformation of at least one of the insulating cylinder, the insulating upper board, and the insulating lower board.

GLASS BASE MATERIAL HANGING MECHANISM

Provided is a glass base material hanging mechanism that, when hanging a starting member or a glass base material, can tightly (solidly) connect the hanging shaft tube and the hanging component and can vertically align the hanging component and the center of the glass base material. 1. A glass base material hanging mechanism that is used in an optical fiber glass base material manufacturing apparatus or an optical fiber drawing apparatus , the glass base material hanging mechanism comprising:a hanging shaft tube that is for hanging a starting member or glass base material and that has a horizontal hole formed in a side portion thereof passing through a central axis thereof; anda hanging component that is positioned above the starting member or glass base material and that has a horizontal hole with an inclined flat surface, whereinthe flat surface is formed in a top surface of the horizontal hole in a manner to be inclined relative to a horizontal plane in a cross-sectional plane orthogonal to a direction in which the horizontal hole extends,the hanging component is inserted into the hanging shaft tube, andboth of the horizontal holes are aligned and a hanging pin is inserted through the horizontal holes to connect the hanging shaft tube and the hanging component.2. The glass base material hanging mechanism according to claim 1 , whereinthe hanging pin is a cylindrical pillar having a flat surface formed in a portion of a side surface thereof, andthe flat surface of the hanging pin is connected to and in contact with the flat surface of the horizontal hole of the hanging component.3. The glass base material hanging mechanism according to claim 1 , whereinthe horizontal hole of the hanging component is a round hole, andthe inclined flat surface in the horizontal hole is formed by inserting into the round hole a cylindrical pillar having a portion of its side surface formed as a flat surface.4. The glass base material hanging mechanism according to claim 1 , whereinan ...

MANUFACTURING APPARATUS AND MANUFACTURING METHOD FOR OPTICAL FIBER POROUS PREFORM

A manufacturing apparatus for an optical fiber porous preform includes a reaction chamber configured to accommodate a starting material; at least one main burner provided in the reaction chamber, the at least one main burner being configured to be supplied with a gas containing at least a source gas and a flammable gas, such that particulates are to be generated from reaction of the source gas and the flammable gas and deposited on the starting material; at least one auxiliary burner configured to be directed toward an end portion of the starting material on which the particulates are to be deposited; and an airflow guide provided such that at least part of the airflow guide is located across the at least one auxiliary burner from the starting material. 1. A manufacturing apparatus for an optical fiber porous preform , the manufacturing apparatus comprising:a reaction chamber configured to accommodate a starting material;at least one main burner provided in the reaction chamber, the at least one main burner being configured to be supplied with a gas containing at least a source gas and a flammable gas, such that particulates are to be generated from reaction of the source gas and the flammable gas and deposited on the starting material;at least one auxiliary burner configured to be directed toward an end portion of the starting material on which the particulates are to be deposited; andan airflow guide provided such that at least part of the airflow guide is located across the at least one auxiliary burner from the starting material.2. The manufacturing apparatus for an optical fiber porous preform according to claim 1 , wherein the airflow guide has an opening on a flame emission side claim 1 , the opening allowing the auxiliary burner to emit flame claim 1 , whereas the airflow guide covers a side of the auxiliary burner claim 1 , the side being opposite to the flame emission side claim 1 , and lateral sides as viewed from the flame emission side.3. The ...

Soot deposition body manufacturing apparatus and manufacturing method

Provided is a manufacturing apparatus for manufacturing a soot deposition body, including a main burner that deposits glass microparticles on a target rod while moving parallel to a longitudinal direction of the target rod; and a side burner that is positioned outside of a movement range of the main burner in a movement direction of the main burner, and fires an end portion of the soot deposition body formed on the target rod. The side burner includes a plurality of heating burners arranged distanced from each other in a circumferential direction of the target rod. In the manufacturing apparatus described above, the main burner may include a plurality of deposition burners that are arranged distanced from each other in the circumferential direction of the target rod.

Method for manufacturing optical fiber preform

Provided is a method for manufacturing an optical fiber preform includes supporting at least one end of an optical fiber preform with a gripping portion; and heating the optical fiber preform while rotating it to process the optical fiber preform, wherein the optical fiber preform is gripped by the gripping portion via a buffer material comprising the gripping portion; wherein the buffer material includes a surface side member in contact with the optical fiber preform, and a surface side member in contact with the gripping portion; wherein a composition of the surface side member in contact with the optical fiber preform and the surface side member in contact with the gripping portion are different; and the surface side member in contact with the optical fiber preform does not contain any of Ca, Mg, Al, K, Na, Mg, or Ba.

FABRICATION METHOD AND FABRICATION APPARATUS FOR POROUS GLASS BASE MATERIAL FOR OPTICAL FIBER

According to a fabrication method for fabricating a porous glass base material for optical fiber, the orientation of a clad forming burner used to form the outermost layer of a clad-corresponding portion is changed further upward while glass fine particles are deposited during the period between a first timing and a second timing. At the first timing, the outer diameter of the porous glass base material for optical fiber has not reached a target outer diameter. The second timing is later than the first timing, and either a timing at which the outer diameter of the porous glass base material for optical fiber reaches the target outer diameter for the first time, or a timing prior to this timing. 1. A fabrication apparatus for fabricating a porous glass base material for optical fiber , comprising:a reaction vessel configured to house therein a hanging seed rod;a core forming burner configured to deposit glass fine particles onto the seed rod to form a core-corresponding portion that is to be formed into a core of optical fiber;a clad forming burner configured to deposit glass fine particles that are to be formed into a clad of the optical fiber, onto the core-corresponding portion to form at least an outermost layer of a clad-corresponding portion that is to be formed into the clad of the optical fiber;a driver configured to change an orientation of the clad forming burner; anda controller configured to control the driver to, while glass fine particles are deposited, change a gradient of the clad forming burner used to form at least the outermost layer of the clad-corresponding portion toward a predetermined gradient relative to the porous glass base material for optical fiber from a downward gradient compared with the predetermined gradient.2. The fabrication apparatus for fabricating a porous glass base material for optical fiber as set forth in claim 1 , whereinthe orientation of the clad forming burner is changed by rotating the clad forming burner around a ...

Production Method of Quartz Glass

A method of manufacturing quartz glass includes depositing soot generated by flame hydrolysis of a raw material gas to a starting member, while the starting member is raised and rotated, to form a soot deposition member that includes an effective portion having a substantially constant outer diameter, the effective portion to become a material of a glass product, an upper ineffective portion formed at an upper end of the effective portion, and a lower ineffective portion formed at a lower end of the effective portion, each of the ineffective portions having an outer diameter changing in a tapering form, wherein the depositing includes forming the lower ineffective portion while decreasing a peripheral speed of a surface of the starting member to a predetermined final peripheral speed in a ratio of 1.3 m/minute or below per second during a period after the effective portion is formed. 1. (canceled)2. (canceled)3. A manufacturing method of manufacturing quartz glass , said method comprising:depositing soot generated by flame hydrolysis of a raw material gas to a starting member, while the starting member is raised and rotated, to form a soot deposition member that includes (i) an effective portion having a substantially constant outer diameter, the effective portion to become a material of a glass product, (ii) an upper ineffective portion formed at an upper end of the effective portion, and (iii) a lower ineffective portion formed at a lower end of the effective portion, each of the ineffective portions having an outer diameter changing in a tapering form,wherein said depositing comprises forming the lower ineffective portion while decreasing a peripheral speed of a surface of the starting member to a predetermined final peripheral speed in a ratio of 1.3 m/minute or below per second during a period after the effective portion is formed and until the starting member and the soot deposition member stop rotating.4. The manufacturing method as set forth in claim 3 , ...

METHOD OF MAKING AN OPTICAL FIBER PREFORM AND HANDLE FOR USE IN MAKING OF OPTICAL FIBER PREFORM

A method for forming an optical fiber preform is provided. The method includes inserting a glass core cane into a glass sleeve such that the glass sleeve surrounds a portion of the glass core cane and such that there is a gap between the glass sleeve and the portion of the glass core cane surrounded by the glass sleeve. The method further includes depositing silica soot onto at least a portion of the glass core cane and at least a portion of the glass sleeve to form a silica soot preform, and flowing gas through the gap during processing of the silica soot preform. 1. A method for forming an optical fiber preform , the method comprising:inserting a glass core cane into a glass sleeve such that the glass sleeve surrounds a portion of the glass core cane and such that there is a gap between the glass sleeve and the portion of the glass core surrounded by the glass sleeve;depositing silica soot onto at least a portion of the glass core cane and at least a portion of the glass sleeve to form a silica soot preform; andflowing gas through the gap during processing of the silica soot preform.2. The method of claim 1 , further comprising inserting a removable insert in the gap between the glass sleeve and the portion of the glass core cane surrounded by the glass sleeve.3. The method of claim 2 , wherein the removable insert comprises a porous silica soot material.4. The method of claim 1 , further comprising welding a portion of the glass sleeve to a portion of the glass core cane.5. The method of claim 1 , further comprising attaching a glass handle to an end of the glass core cane.6. The method of claim 1 , wherein processing of the silica soot preform comprises sintering the silica soot preform in a furnace to form a consolidated glass preform.7. The method of claim 6 , wherein sintering the silica soot preform comprises raising the temperature of the furnace to a sintering temperature at a rate of greater than about 15° C. per minute.8. The method of claim 7 , wherein ...

SYSTEM AND METHOD FOR POSITIONING AN OPTICAL PREFORM IN A FURNACE

A system for positioning an optical preform in a furnace is provided that includes an upper muffle and a downfeed handle assembly with a tube defining a first end and a second end, the second end extending into the upper muffle. A handle is disposed within the tube. A second end of the handle extends into the upper muffle and a seal assembly is positioned around both the tube and the handle. The first end of the handle extends through the seal assembly and a drive assembly is coupled with the downfeed handle. 1. A method for positioning an optical preform in a furnace , comprising:providing a chuck interface movably coupled with a drive assembly;positioning the chuck interface within a seal assembly;coupling a handle within the chuck interface, an optical fiber preform positioned on an opposite end of the handle from the chuck interface;positioning the handle within a tube;positioning the optical fiber preform within a furnace; andmoving the handle at least one of laterally and rotationally within the tube such that the optical fiber preform is moved at least one of laterally and rotationally within the furnace.2. The method of claim 1 , wherein the handle extends through the seal assembly.3. The method of claim 2 , wherein the handle moves laterally within the tube and the lateral movement of the handle is independent of the tube.4. The method of claim 3 , wherein the handle moves rotationally within the tube and the rotational movement of the handle is independent of the tube.5. The method of claim 1 , wherein the handle and the tube are configured to move vertically together.6. The method of claim 1 , wherein the chuck interface is coupled to a face seal within the seal assembly.7. A system for positioning an optical preform in a furnace claim 1 , comprising: a tube defining a first end and a second end;', 'a handle disposed within and extending through the tube; and', 'a seal assembly extending around both the handle and the tube, the handle extending through ...

USING SILICON TETRAFLOURIDE DURING POWDER-IN-TUBE (PIT) PROCESS

The embodiments disclosed herein seek to ameliorate the high costs associated with the use of ultra-pure silica by using a lower-cost starting material and purifying the lower-cost starting material to an acceptable level of purity during the preform manufacturing process. In one embodiment, instead of using fully densified silica crystals, the disclosed process uses porous silica grains that have a substantially monodisperse size distribution as the starting materials for a powder-in-tube preform manufacturing process and utilize silicon tetrafloride doping to promote silica dehydration. 1. A powder-in-tube perform manufacturing process , comprising:sealing a bottom of a thin-walled silica tube;inserting a core rod into the silica tube, the inserted core rod being substantially centered within the silica tube;filling the silica tube with mesoporous silica grains, the mesoporous silica grains being substantially monodisperse in size;{'b': '800', 'removing impurities by heating the mesoporous silica grains to a temperature that is less than approximately degrees Celsius (° C.);'}{'sub': '4', 'adding silicon tetrafluoride gas (SiF) to the purified mesoporous silica grains;'}{'sub': '4', 'heating the purified mesoporous silica grains in the presence of the SiFgas at a temperature of greater than approximately 1000° C., which results in dehydration of the purified mesoporous silica and fluorine doping of silica;'}{'sub': '4', 'sintering the purified mesoporous silica grains in the presence of SiF; and'}consolidating the silica tube.2. The process of claim 1 , wherein heating the mesoporous silica grains in the presence of the SiFgas results in a depressurization of the silica tube.3. The process of claim 1 , the SiFgas being added to the silica tube to create a about 0.5 atmospheres of pressure of SiFgas within the silica tube.4. A preform manufacturing process claim 1 , comprising:filling a silica tube with substantially homogeneous mesoporous silica grains;{'sub': '4 ...

Manufacturing method of optical fiber preform

A manufacturing method of an optical fiber preform used to produce an optical fiber includes: etching a surface of a core preform that forms a core of the optical fiber with a plasma flame in a chamber; obtaining a porous preform by depositing glass particles on an etched surface of the core preform to form an outside vapor-deposited layer that forms a cladding of the optical fiber in a state where the core preform is put into the chamber; and heating and sintering the porous preform. When obtaining the porous preform, the outside vapor-deposited layer is formed by repeatedly performing the deposition of the glass particles multiple times through supply of source material gas. In a first deposition among the multiple times of deposition of the glass particles, a flow rate of the source material gas is less than or equal to 50% of a stable value.

Enhanced Particle Deposition System and Method

A deposition system for depositing a chemical vapor onto a workpiece is disclosed, including a deposition chamber having a plurality of components for performing chemical vapor deposition on the workpiece. The workpiece is held by a lathe that rotates the workpiece relative to chemical burners that deposit silica soot on the workpiece. The deposition system has a gas panel for regulating the flow of gases and vapors into the deposition chamber, and a computer for controlling operation of the gas panel and the components in the deposition chamber. Multiple sets of chemical burners are disposed longitudinally along the length of the workpiece. Each set of burners is separated from other sets, such that each set of burners deposit silica particles onto generally different portions of a workpiece. The respective portions include an overlap segment in which one or more burners from one burner set will deposit silica particles on the same portion of the workpiece as one or more burners from another set. 121-. (canceled)22. A deposition system for depositing silica particles onto a workpiece comprising:a first set of chemical deposition burners for depositing silica particles onto a first portion of the workpiece, the first set of burners having a first burner and second burner;a second set of chemical deposition burners for depositing silica particles onto a second portion of the workpiece, the second set of burners having a third burner and a fourth burner; anda lathe for holding the workpiece and for rotating the workpiece relative to the first set of burners and second set of burners;wherein the first and second portions of the workpiece overlap each other at an overlap segment onto which one burner from each set substantially deposits silica particles, andwherein the longest distance between deposition burners within any set is less than the shortest distance between burners in different sets.23. The deposition system of claim 22 , the first and second chemical ...

Suspending device for optical fibre preforms

An optical fibre preform suspending device for vertically holding an optical fibre preform by a preform handle comprising a handle enlarged-width portion is provided. The preform suspending device having a substantially cylindrical shape and comprising a housing portion having a receiving space with a front top opening and a front bottom opening and a supporting surface between the front top opening and the front bottom opening. The preform suspending device also comprises a supporting member placed on the supporting surface, for holding the handle enlarged-width portion. The supporting member is radially independent from the housing portion.

Enhanced Particle Deposition System and Method

A deposition system for depositing a chemical vapor onto a workpiece is disclosed, including a deposition chamber having a plurality of components for performing chemical vapor deposition on the workpiece. The workpiece is held by a lathe that rotates the workpiece relative to chemical burners that deposit silica soot on the workpiece. The deposition system has a gas panel for regulating the flow of gases and vapors into the deposition chamber, and a computer for controlling operation of the gas panel and the components in the deposition chamber. Multiple sets of chemical burners are disposed longitudinally along the length of the workpiece. Each set of burners is separated from other sets, such that each set of burners deposit silica particles onto generally different portions of a workpiece. The respective portions include an overlap segment in which one or more burners from one burner set will deposit silica particles on the same portion of the workpiece as one or more burners from another set. 121-. (canceled)22. A method of manufacturing optical fiber comprising the steps of:obtaining a start rod;depositing fused silica on the start rod to produce an optical fiber preform; depositing silica on a first portion of the start rod using a first pair of burners separated from each other by a distance of about d,', 'depositing silica on a second portion of the start rod using a second pair of burners separated from each other by a distance of about d,', 'wherein the first and second portions overlap each other and the overlap has a width of about d, and', 'wherein the first pair of burners is separated from the and second pair of burners are separated by a distance T, where T is greater than three times d., 'wherein the depositing step comprises steps of23. The method of claim 22 , further comprising the steps of sintering the optical fiber preform and drawing the optical fiber preform into optical fiber.24. The method of claim 23 , further comprising the step of ...

Glass body manufacturing apparatus, glass body manufacturing method, soot conveying mechanism, and soot heating mechanism

A glass body manufacturing apparatus includes: a first heating furnace including a furnace core tube accommodating the soot and a first heater, to supply a dehydration gas into the furnace core tube and heat the soot at a first treatment temperature lower than a softening point of the porous portion by the first heater; a second heating furnace including a structural body accommodating the soot and a second heater, to heat the soot at a second treatment temperature equal to or higher than the softening point by the second heater; and a conveyance container, connectable to each of the first and second heating furnaces while keeping airtightness with respect to the atmosphere, to accommodate and hold the soot, and convey the soot between the first and second heating furnaces.

METHOD OF MANUFACTURING PREFORMS FOR OPTICAL FIBRES HAVING LOW WATER PEAK

A method of manufacturing at least one optical fibre preform comprising: providing a plurality of partially porous intermediate preforms, each partially porous intermediate preform having a longitudinal axis and comprising a respective soot intermediate clad layer formed around a respective glass core rod comprising a central core region of radius a and an inner clad region of radius b to define a first core-to-clad ratio a/b; consolidating the formed soot intermediate clad layers to form a respective plurality of intermediate glass preforms, each of the plurality of intermediate glass preforms comprising an intermediate clad region having an external radius c to define a second core-to-clad ratio a/c of from 0.20 to 0.30, and overcladding at least one intermediate glass preform by forming an overclad region surrounding the intermediate clad region to form an optical fibre glass preform, wherein consolidating comprises exposing the plurality of intermediate preforms to a consolidation hot zone of a single furnace body while rotating each of the intermediate preforms about its respective longitudinal axis.

수트 모재의 제조 장치

본 발명에 따른 수트 모재의 제조 장치는 화염 가수분해에 의해 생성된 수트를 상기 수트 모재에 증착하기 위한 적어도 하나 이상의 토치와, 액상의 유리 원료 물질 또는 굴절률 제어 물질을 끓는 점 이상으로 가열하여 기화시켜서 파이프를 통해 상기 토치에 제공하기 위한 기화기와, 적정 온도로 가열된 액상 유리 원료 물질 또는 굴절률 제어 물질을 이송 가스로 기화시켜서 파이프를 통해서 해당 토치에 제공하기 위한 버블러를 포함한다. 화염 가수 분해, 광섬유 모재, 기상 축 증착

Method and apparatus for production of glass preform for optical fiber

내용없음 No content

Production of deposited glass soot

(57)【要約】本公報は電子出願前の出願データであるた め要約のデータは記録されません。

Method and apparatus for producing optical fiber preform

Optical fiber preform base material manufacturing equipment

Method and apparatus for manufacturing optical fiber preform

Patent JPH0525818B2

Production of parent material for optical fiber

(57)【要約】本公報は電子出願前の出願データであるた め要約のデータは記録されません。

Manufacturing method of single mode optical fiber base material

본 발명은 싱글모드광파이버용 모재의 제조방법에 관한 것으로서, 코어재가 GeO 2 를 함유한 SiO 2 로 이루어지고, 클래드재가 고순도의 SiO 2 로 이루어진 유리모재의 제조에서 컷오프파장의 설계치로부터의 어긋남이 적은 광파이버를 제조하는 방법을 제공하는 것을 목적으로 하며, 그 구성에 있어서, 코어용 다공질유리체를 가열에 의해 직경축소할 때에, 그 직경축소율을 0.90을 초과하는 값으로 하면, 코어의 굴절율분포곡성에 있어서의 「스파이크」를 억제할 수 있고, 또한, 컷오프파장의 설계치로부터의 어긋남을 작게 억제할 수 있는 것이 판명되었다. 따라서, 코어형성용 버너에 의해 생성된 SiO 2 미립자 및 GeO 2 미립자를 퇴적해서 회전하는 출발막대의 선단으로부터 축방향으로 코어용 다공질유리체를 성장시키는 제1의 스텝과 코어용 다공질유리체를 성장시키면서, 성장후의 코어용 다공질유리체를 가열수단에 의해서 가열하므로서 직경축소시키는 제2의 스텝과, 코어용 다공질유리체의 성장 및 직경축소를 행하면서, 클래드형성용 버너에 의해 생성된 SiO 2 미립자를 퇴적해서 직경축소후의 코어용 다공질유리체의 외주에 클래드용 다공질유리층을 형성하는 제3의 스텝을 구비하고, 제2의 스텝에 의한 직경축소후의 코어용 다공질유리체의 외경이, 직경축소전의 외경의 0.90배를 초과하고 있는 것을 특징으로 한 것이다.

Preparation of parent body for elliptic core

Production of optical fiber retaining polarizing surface

Method for vapour deposition on an elongated substrate

Device and method for chemical deposition on an elongated member of vitreous material in which a rotating gripping member causes a first end portion of the elongated member to rotate. The second end portion of the elongated member is borne by a pair of supporting members which are axially spaced apart (L 1 ) and are capable of permitting angular rotational movement and axial sliding of the second end portion. Each supporting member also applies a radial constraint preventing the second end portion from moving away from the axis of rotation, thus forcing the second portion and the elongated member to lie with a longitudinal axis coaxial with the axis of rotation. Any curvature of the elongated member is corrected and recovered in this way.

Quartz glass article and method for forming a quartz glass optical component

석영 유리 광학 소자의 제조 방법이 제공된다. 방법은 코어 막대 유리 및 클래딩 유리로 만들어진 실린더형 석영 유리 본체를 제공하는 단계를 포함한다. 석영 유리 본체는 제1 외경을 갖는 스퀘어 커트 제1 말단을 갖는다. 방법은 제1 말단 및 제1 외경의 50% 내지 110%인 제2 외경을 갖는 대향하는 스퀘어 커트 제2 말단을 갖는 유리 핸들을 제공하는 단계; 유리 핸들의 스퀘어 커트 말단을 석영 유리 본체의 것에 부착하는 단계; 및 유리 핸들을 사용하여 석영 유리 본체를 인선로를 통해 인도하는 단계를 추가로 포함한다. 실린더형 석영 유리 본체와 유리 핸들의 인터페이스에 근접한 클래드-대-코어 비의 왜곡률은 5% 미만이다. A method of manufacturing a quartz glass optical element is provided. The method includes providing a cylindrical quartz glass body made of core rod glass and cladding glass. The quartz glass body has a square cut first end having a first outer diameter. The method comprising: providing a glass handle having a first end and an opposing square cut second end having a second outer diameter of 50% to 110% of the first outer diameter; Attaching a square cut end of the glass handle to the quartz glass body; And guiding the quartz glass body through the wire line using a glass handle. The distortion of the clad-to-core ratio close to the interface between the cylindrical quartz glass body and the glass handle is less than 5%.

Production method and device of optical fiber parent material

VAD법에 의한 광섬유 모재(2)의 제조 방법에 있어서, 수트 코어의 선단 위치(3)를 이산적인 값으로 검출하는 검출 공정과, 검출한 선단 위치(3)의 값을 미리 정해진 시간으로 평균화하는 평균화 공정과, 평균화된 선단 위치(3)의 값이 일정하게 되도록 수트 코어의 제조 조건을 조정하는 조정 공정을 포함하며, 조정 공정에 있어서, 평균화된 선단 위치(3)의 값과, 미리 이산적으로 검출될 수 있는 이웃하는 2개의 값 사이에 설정한 목표 위치의 값과의 차가 0으로 되도록 제조 조건을 순차로 조정한다. 광섬유 모재, 수트 코어, 클래드, VAD, 선단 위치

Apparatus for mass producing fiber optic preforms and optic fibers

A large plurality of fiber optic preforms are manufactured by chemically vapor depositing the fiber optic glass constituents on the exterior surface of electrically heatable mandrels. A corresponding plurality of mandrels are located relative to a common source of materials for chemical vapor deposition thereon. A substantial savings in materials cost, manufacturing time and greater uniformity between the individual preforms is thereby accomplished.

Directing glass forming constituents against a lateral surface parallel to the axis of rotation of a starting member to form a monolithic blank for an optical waveguide

A hydrolyzing flame technique is used to build up glass soots of at least two different compositions upon a rotating starting member. The process is repeated until the soots define at least one helically-oriented body of soot of one composition completely enveloped by a soot of a second composition. The soot-covered starting member is then subjected to heat to fuse it whereupon the soots are fused into compositions exhibiting different indices of refraction. The member can then be drawn into a elongate structure comprising an optical waveguide extending helically through the body of the structure.

METHOD FOR CLOTHING OPTICAL PREFORMS WITH GLASS.

Methods of making optical waveguides and waveguides made thereby

Low attenuation, low dispersion of optical waveguides are provided by a process initiating with axial deposition of a high velocity core soot stream impinging on a target at a high angle of incidence relative to the axis of rotation of the target. A core cylinder is built up axially by relative movement between the soot stream and target during deposition, the movement being non-constant in order to maintain a substantially constant diameter with a constant deposition rate. A cladding layer is then built up by deposition of soot radially on the core. Subsequent drying and sintering provides a vitreous preform which may be drawn directly into optical waveguides. Alternatively, the sintered product may be drawn down to smaller rods, which then are covered with further deposited soot cladding to a desired final thickness, and after further drying and sintering may be drawn to optical waveguides.

Process for the production of quartz glass bodies

Method and apparatus for producing quartz glass pipes

According to known methods for producing a synthetic quartz glass pipe, a porous SiO2 blank is formed by deposition of SiO2 particles on the cylinder jacket surface of a mandrel rotating about its longitudinal axis, after which the mandrel is removed and the blank sintered. The aim of the invention is to provide, on the basis of the above, an economical method for the production of quartz glass pipes which simplifies the use of economical, cylindrical mandrels. To facilitate the removal of the mandrel (22),he invention provides for a face end (25) of the blank (6) to be fixed in a recess (11) having a passage (15) and a fixed counter support (13) made of a deformable mass, and for said end to be aligned in such a way that the mandrel (22) extends through the passage (15). The mandrel (22) is subjected to a tensile or pushing force which acts in the direction of the longitudinal axis (23) of the mandrel and by means of which the end (25) of the blank (6) is pressed against the counter support (13). Said force is increased continuously util the mandrel (22) detaches from the blank (6). The invention also relates to a suitable device for removing mandrels from blanks, which comprises a holding device (11; 17) for fixing and aligning the blank (6). Said device has a recess (11) for receiving one of the ends (25) of the blank (6). The recess is provided with a counter support (13) made of a deformable mass and has a passage (15) through which the mandrel (22) is able to pass. The device also comprises a pulling or pushing device (5) which engages the mandrel (22) and acts in the direction of the longitudinal axis (23) of same. By means of said device the end (25) of the blank (6) connected to the mandrel (22) can be moved against the counter support (13).

Process for producing a hollow cylinder from quartz glass

Verfahren zur Herstellung eines Hohlzylinders aus Quarzglas, umfassend ein Abscheiden von SiO 2 -Partikeln auf einem länglichen, um seine Längsachse rotierenden Träger unter Bildung eines porösen, hohlzylindrischen Rohlings, und Verglasen des in vertikaler Ausrichtung in einem Ofen hängenden Rohlings unter Einsatz einer Aufhängung, die an einer im oberen Bereich der Innenbohrung des Rohlings vorgesehenen Verengung angreift, dadurch gekennzeichnet, dass die Verengung (6b) durch Formung der Innenbohrung (7) beim Abscheiden der SiO 2 -Partikel erzeugt wird, und dass beim Verglasen ein Hohlzylinder mit werkzeugfrei geformter, zylindrischer Bohrung erzeugt wird, indem zum Verglasen eine Aufhängung (8; 9; 10) von oben (11) in die Innenbohrung (7) hineinragt, die die Verengung (6b) untergreift. A method for producing a hollow cylinder made of quartz glass, comprising depositing SiO 2 particles on an elongate support rotating about its longitudinal axis to form a porous, hollow cylindrical blank, and vitrifying the blank hanging in a vertical orientation in an oven using a suspension engages in a constriction provided in the upper region of the inner bore of the blank, characterized in that the constriction (6b) is produced by shaping the inner bore (7) when the SiO 2 particles are separated, and in that a hollow cylinder with a tool-free, cylindrical shape is produced during the glazing Bore is produced by a suspension (8; 9; 10) protruding from above (11) into the inner bore (7) for glazing, which engages under the constriction (6b).

Hot substrate deposition of fused silica

Fused silica injected or created by pyrolysis of SiCl 4 are introduced in a powder state into a vacuum chamber. Pluralities of jet streams of fused silica are directed towards a plurality of heated substrates. The particles attach on the substrates and form shaped bodies of fused silica called preforms. For uniformity the substrates are rotated. Dopant is be added in order to alter the index of refraction of the fused silica. Prepared soot preforms are vitrified in situ. Particles are heated, surface softened and agglomerated in mass and are collected in a heated crucible and are softened and flowed through a heated lower throat. The material is processed into quartz plates and rods for wafer processing and optical windows.

Process and apparatus for production of silica grain having desired properties and their fiber optic and semiconductor application

Silica grain of desired properties and size is created in a vacuum chamber. Fine silica powder is injected in the chamber or silica powder is formed in situ by combusting precursors. A plasma is formed centrally in the chamber to soften the silica powders so that they stick together and form larger grains of desired size. The grains are collected, doped, fused and flowed into tubes or rods. A puller pulls the tube or rod through a chamber seal into a lower connected vacuum chamber. The tube or rod is converted to rods and fibers or plates and bars in the connected chamber. Fused silica in a crucible tray is subjected to ultrasound or other oscillations for outgassing. Gases are removed by closely positioned vacuum ports.

Hot substrate deposition fiber optic preforms and preform components process and apparatus

Fused silica created by pyrolysis of SiCl 4 are introduced in a powder state into a vacuum chamber. Pluralities of jet streams of fused silica are directed towards a plurality of heated substrates. The particles attach on the substrates and form shaped bodies of fused silica called preforms. For uniformity the substrates are rotated. Dopant is be added in order to alter the index of refraction of the fused silica. Prepared soot preforms are vitrified in situ. The material is processed into quartz tubes for fiber optics and other applications, quartz rods for fused silica wafers for semiconductors and various optical applications and quartz plates for wafer processing and optical windows.

Method for producing an optical blank from synthetic quartz glass

Die Erfindung betrifft ein Verfahren zur Herstellung eines optischen Rohlings aus synthetischem Quarzglas durch Verglasen und Umformen eines porösen, eine Längsachse (L) aufweisenden, zylinderförmigen SiO 2 Sootkörpers (1) in einer eine Schmelzform (23) mit Bodenplatte (24) aufweisenden Erhitzungszone (21), umfassend folgende Verfahrensschritte: (a) Verglasen des SiO2-Sootkörpers (1) in der Erhitzungszone (21) bei einer Verglasungstemperatur unter Bildung eines vollständig verglasten, transparenten Quarzglaskörpers (6), und anschließend (b) Umformen des verglasten Quarzglaskörpers (6) durch Erweichen in der Schmelzform (23) bei einer Erweichungstemperatur unter Bildung einer viskosen Quarzglasmasse (7), welche das Volumen der Schmelzform (23) ganz oder teilweise ausfüllt, und (c) Abkühlen der Quarzglasmasse (7) und Entnahme aus der Schmelzform (23) unter Bildung des optischen Rohlings. Um vollzylindrische Rohlinge aus synthetischem Quarzglas mit reproduzierbar guter Qualität, hoher Reinheit und homogenen, rotations-symmetrischen Eigenschaftsprofilen zu erhalten wird erfindungsgemäß vorgeschlagen, dass beim Verglasen gemäß Verfahrensschritt (a) ein vollzylindrischer Quarzglaskörper (6) gebildet wird, und dass beim Umformen in der Schmelzform (23) gemäß Verfahrensschritt (b) der vollzylindrische Quarzglaskörper (6) durch gesteuertes Zuführen mit einem Zentrierungsmittel der Bodenplatte (24) in Kontakt gebracht wird. The invention relates to a method for producing an optical blank of synthetic quartz glass by vitrification and forming of a porous, cylindrical SiO 2 soot body (1) having a longitudinal axis (L) in a heating zone (21) having a melt mold (23) with bottom plate (24) ), comprising the following method steps: (a) vitrifying the SiO 2 soot body (1) in the heating zone (21) at a vitrification temperature to form a fully vitrified, transparent quartz glass body (6), and then (b) reforming the vitreous silica glass body (6) by softening in the melt mold (23) at a ...

METHOD OF MANUFACTURING A PREFORM FOR OPTICAL FIBERS

Production of soot form glass rod for optical transmission

Method for producing quartz glass body

Porous glass base material manufacturing equipment for optical fiber

안정되게 고품질의 광파이버용 다공질 글래스모재(프리폼)를 제조가능한 광파이버용 다공질 글래스모재 제조장치로서, VAD법으로, 타겟봉(4)에 다공질 글래스미립자를 퇴적시켜 광파이버용 글래스미립자퇴적체(6)를 성장시킬 때, 척(26)으로 회동이 자유롭게 지지하는 것만으로 타겟봉(4)을 상승시키지 않고, 수트체(soot body)(2)의 선단을 레이저(36)와 수광기(受光器)(38)로 검출하여, 코어버너(20)와 클래드버너(22)를 하강시키고 있다. 선단위치검출장치와 버너를 동기(同期)시켜 하강시키면서 다공질 글래스 하측에 퇴적성장시킨다.

Method for manufacturing quartz glass body

(57)【要約】 本発明は、細長い多孔質母材を形成し、その縦軸線を中心に回転する円筒状の支持体の円筒形外表面にＳｉＯ 2 粒子を堆積させることにより石英ガラス体を製造する方法に関する。ＳｉＯ 2 粒子は、支持体の縦軸線に平行に存在する少なくとも１つの列に配置された複数個の堆積用バーナで形成され、バーナ列は、それらの運動方向が反転される転向点間で往復運動形式で、予め設定された移動速度で移動する。得られた母材は、焼結される。本発明によれば、形成過程において母材の表面温度の基礎値は、１０５０℃と１３５０℃との間に維持され、母材の平均周速度は８ｍ／分と１５ｍ／分との間に維持され、且つバーナ列の平均並進速度は３００ｍｍ／分と８００ｍｍ／分との間に維持される。

Manufacture of optical glass base material

(57)【要約】本公報は電子出願前の出願データであるた め要約のデータは記録されません。

Quartz glass article and method for forming a quartz glass optical component

석영 유리 광학 소자의 제조 방법이 제공된다. 방법은 코어 막대 유리 및 클래딩 유리로 만들어진 실린더형 석영 유리 본체를 제공하는 단계를 포함한다. 석영 유리 본체는 제1 외경을 갖는 스퀘어 커트 제1 말단을 갖는다. 방법은 제1 말단 및 제1 외경의 50% 내지 110%인 제2 외경을 갖는 대향하는 스퀘어 커트 제2 말단을 갖는 유리 핸들을 제공하는 단계; 유리 핸들의 스퀘어 커트 말단을 석영 유리 본체의 것에 부착하는 단계; 및 유리 핸들을 사용하여 석영 유리 본체를 인선로를 통해 인도하는 단계를 추가로 포함한다. 실린더형 석영 유리 본체와 유리 핸들의 인터페이스에 근접한 클래드-대-코어 비의 왜곡률은 5% 미만이다.

Base material for optical fiber and method for production thereof and method for production of optical fiber

적어도 2개의 코어 모재(70)를 융착에 의해 결합하여 1개의 코어 모재로 하는 공정과, 코어 모재(70)의 양단에 한 벌의 더미용 유리 로드(61, 62)를 융착하여 출발재 유리 로드로 하는 공정과, 화염 가수분해 반응에 의해 생성된 유리 미립자를 출발재 유리 로드의 외주에 퇴적시켜 다공질 모재(80)로 하는 공정과, 다공질 모재(80)를 소결에 의해 투명 유리화해 코어부 및 클래드부를 포함하는 광섬유용 모재(310)로 하는 공정을 포함하는 광섬유용 모재의 제조 방법과 이에 의해 제조된 광섬유용 모재에 관한 것이다. 코어 모재, 융착, 화염 가수분해, 다공질 모재, 소결

Method for producing an optical fibre telecommunications cable with reduced polarization mode dispersion

An optical cable (1) for telecommunications comprises an optical core (2) and a plurality of protecting and reinforcing elements or layers (7, 11 and 13) placed around the optical core, the optical core (2) comprising, in turn, a central reinforcing element (4), a polymer layer (5), a plurality of optical fibres (3) incorporated in the polymer layer (5) and a thin sheath (6) which covers the polymer layer (5), the optical fibres having an alternating spin about their own axes with a maximum value of at least 4 twists per metre, and comprising a core (12) having a mean ellipticity in the range from 0.25 to 0.55, in such a way that the effects of birefringence of the fibres caused by the cabling process are significantly reduced.

Method and apparatus for drawing a class ingot

A method for drawing a glass ingot into a rod having a given outer diameter is described. The method is characterized in that when the glass ingot is fed into a heating zone at a final tapered portion thereof, a temperature in the heating zone is decreased so that the final tapered portion is prevented from being drawn in excess owing to the heat from the heating zone.

Method for fixing starting rod for producing base material of optical fiber

(57)【要約】本公報は電子出願前の出願データであるた め要約のデータは記録されません。

PROCESS AND PLANT FOR THE CONTINUOUS MANUFACTURE OF OPTICAL FIBERS

POUR FABRIQUER EN CONTINU DES FIBRES OPTIQUES, NOTAMMENT A GRADIENT D'INDICE, ON SOUDE BOUT A BOUT DES BARREAUX DE SILICE 7, 8 DESTINES A CONSTITUER LE NOYAU DE LA FIBRE; ON DEPOSE SUR LES BARREAUX, PAR REACTION CHIMIQUE, UNE COURONNE DE SILICE CONTENANT UNE PROPORTION DE DOPANT VARIABLE AU FUR ET A MESURE DE L'AUGMENTATION DE DIAMETRE DE LA COURONNE POUR CONSTITUER DES PREFORMES SUCCESSIVES 23; ET ON FILE LES PREFORMES AU DIAMETRE DE FIBRE. UNE INSTALLATION PERMETTANT DE METTRE EN OEUVRE CE PROCEDE COMPORTE DES MOYENS D'AVANCE CONTINUE GRACE AUXQUELS TOUTES LES OPERATIONS S'EFFECTUENT EN SUCCESSION. IN ORDER TO CONTINUOUSLY MANUFACTURE OPTICAL FIBERS, IN PARTICULAR IN INDEX GRADIENT, SILICA BARS 7, 8 ARE WELDED END TO END TO CONSTITUTE THE CORE OF THE FIBER; A SILICA CROWN CONTAINING A VARIABLE PROPORTION OF DOPANT AS FUR AND AS THE DIAMETER OF THE CROWN INCREASE IS DEPOSITED ON THE BARS, BY CHEMICAL REACTION, TO CONSTITUTE SUCCESSIVE PREFORMS 23; AND WE THREAD THE PREFORMS TO THE DIAMETER OF FIBER. AN INSTALLATION ALLOWING THE IMPLEMENTATION OF THIS PROCEDURE INCLUDES MEANS OF CONTINUOUS ADVANCE THANKS TO WHICH ALL OPERATIONS ARE PERFORMED IN SUCCESSION.

PROCESS FOR MANUFACTURING LARGE OPTICAL PREFORMS

Procédé de fabrication de grandes préformer optiques. Une grande préforme optique est fabriquée en faisant tourner une plate-forme autour de son axe pendant qu'elle s'écarte d'une série d'ajustages. Chaque ajustage est disposé de façon à former un anneau de la préforme grâce à une technique d'oxydation en phase vapeur. La composition de la vapeur introduite par chaque ajustage est telle qu'une préforme optique de grand diamètre est obtenue dont l'indice de réfraction est à échelon, varie progressivement ou permet un mode de propagation optique. La préforme ainsi obtenue est alors étirée en câble à fibre optique ayant les propriétés précédentes. Application à la fabrication des câbles à fibres optiques. Manufacturing process of large optical preformers. A large optical preform is made by rotating a platform around its axis as it moves away from a series of adjustments. Each fit is arranged to form a ring of the preform using a vapor phase oxidation technique. The composition of the vapor introduced by each adjustment is such that an optical preform of large diameter is obtained whose refractive index is stepped, varies progressively or allows an optical propagation mode. The preform thus obtained is then drawn into an optical fiber cable having the preceding properties. Application to the manufacture of optical fiber cables.

Method and apparatus for depositing glass soot

The invention includes methods and apparatus for depositing soot onto a glass surface to minimize water in the deposited soot and the diffusion of the water into the glass surface. The invention includes depositing a first layer of soot a on the glass surface at a first forward traverse rate and depositing a second layer of soot at a second forward traverse rate.

DEVICE FOR SUPPORTING A PREFORM, INSTALLATION FOR MANUFACTURING OR RECHARGING A PREFORM, PROVIDED WITH SUCH A DEVICE, METHODS IMPLEMENTED IN SUCH AN INSTALLATION, PREFORM PRODUCED ACCORDING TO SUCH METHODS

L'invention concerne un dispositif de soutien d'une préforme (1) fabriquée dans une installation de fabrication ou de recharge de préformes (1) à âme support (2), ladite installation comprenant au moins des moyens de rotation (3) d'axe de rotation horizontal (4) ayant deux points de montage (3a, 3b) entre lesquels est montée l'âme support (2) de la préforme (1) à fabriquer ou à recharger, des moyens (5) de torche à plasma et d'apport de matière disposés radialement à ladite âme support (2) et ayant un mouvement relatif de translation axiale parallèle à l'âme support (2) pour la réalisation de ladite préforme (1) autour de ladite âme support (2), ledit dispositif étant caractérisé en ce qu'il comprend des moyens de soutien commandés (7) constituant des points d'appui (8) complémentaires localisés entre lesdits points de montage (3a, 3b) pour ladite préforme (1) en cours de fabrication ou en cours de recharge. The invention relates to a device for supporting a preform (1) manufactured in an installation for manufacturing or recharging preforms (1) with a support core (2), said installation comprising at least means of rotation (3) of horizontal axis of rotation (4) having two mounting points (3a, 3b) between which is mounted the support core (2) of the preform (1) to be manufactured or recharged, plasma torch means (5) and supply of material disposed radially to said support core (2) and having a relative movement of axial translation parallel to the support core (2) for the production of said preform (1) around said support core (2), said device being characterized in that it comprises controlled support means (7) constituting complementary support points (8) located between said mounting points (3a, 3b) for said preform (1) during manufacture or in recharging course.

PROCESS FOR STRETCHING OPTICAL GLASS WAVE GUIDES

Procédé pour la formation d'un filament en verre de haute pureté à l'aide d'un mandrin sensiblement cylindrique. On applique un premier revêtement de suie de verre à la surface périphérique extérieure du mandrin, on enlève ce dernier pour former une préforme de suie dans laquelle est ménagée une ouverture, on chauffe la préforme à une température suffisamment élevée et pendant une durée suffisante pour permettre à la suie de s'agglomérer au moins à une extrémité de celle-ci, et l'on étire simultanément la portion agglomérée de la préforme pour en réduire la section et occlure ladite ouverture, formant ainsi un filament. Application à la fabrication de guides d'ondes optiques. A process for forming a high purity glass filament using a substantially cylindrical mandrel. A first coating of glass soot is applied to the outer peripheral surface of the mandrel, the latter is removed to form a soot preform in which an opening is made, the preform is heated to a sufficiently high temperature and for a sufficient time to allow the soot to agglomerate at least at one end thereof, and simultaneously stretching the agglomerated portion of the preform to reduce its section and occlude said opening, thus forming a filament. Application to the manufacture of optical waveguides.

DEVICE FOR MANUFACTURING AN OPTICAL FIBER PREFORM COMPRISING A RING FOR TRAPPING AND DIFFUSING LIGHT RADIATION

Patent FR2489808A1

L'INVENTION CONCERNE UN PROCEDE DE FABRICATION DE VERRE DE SILICE DOPE. SELON L'INVENTION, ON SOUMET UN COMPOSE DE SILICIUM FACILEMENT OXYDABLE A UNE HYDROLYSE A LA FLAMME EN 1 POUR PRODUIRE DES PARTICULES FINES DE VERRE DE SILICE 3, ON Y DISSOUT UN OXYDE DOPANT AU MOYEN DE L'OXYDATION D'UN GAZ POUR FORMER DU VERRE DE SILICE DOPE SUR LES SURFACES DES PARTICULES FINES ET ON FRITTE POUR VERIFIER LES PARTICULES FINES DE VERRE DE SILICE DOPE POUR FORMER DU VERRE DE SILICE DOPE. L'INVENTION S'APPLIQUE NOTAMMENT A LA PRODUCTION DE FIBRES OPTIQUES. THE INVENTION RELATES TO A PROCESS FOR MANUFACTURING DOPED SILICA GLASS. ACCORDING TO THE INVENTION, A EASILY OXIDIZABLE SILICON COMPOUND IS SUBJECTED TO FLAME HYDROLYSIS IN 1 TO PRODUCE FINE PARTICLES OF SILICA GLASS 3, A DOPING OXIDE IS DISSOLVED THEREIN BY MEANS OF OXIDIZING A GAS TO FORM SILICA GLASS DOPED ON THE SURFACES OF THE FINE PARTICLES AND FRITTED TO CHECK THE FINE PARTICLES OF SILICA GLASS DOPED TO FORM DOPED SILICA GLASS. THE INVENTION APPLIES IN PARTICULAR TO THE PRODUCTION OF OPTICAL FIBERS.

Method for cutting glass rod and cutting device for use therein

PROCESS FOR MANUFACTURING PREFORMS FOR OPTICAL FIBERS AND CHUCK USED FOR CARRYING OUT SAID METHOD, APPLICATION TO THE MANUFACTURE OF MONOMOD OPTICAL FIBERS

PROCEDE DE FABRICATION DE PREFORMES POUR FIBRES OPTIQUES ET MANDRIN UTILISABLE POUR LA MISE EN OEUVRE DE CE PROCEDE, APPLICATION A LA FABRICATION DE FIBRES OPTIQUES MONOMODES. SELON L'INVENTION, ON FORME UN BARREAU CREUX DE SILICE 14 SUR UN MANDRIN, PAR UNE METHODE DE DEPOT EXTERNE UTILISANT UNE TORCHE A PLASMA, ON ENLEVE LE MANDRIN ET L'ON DEPOSE, SUR LA FACE INTERNE DU BARREAU, UN REVETEMENT VITREUX 34 DESTINE A LA FORMATION ULTERIEURE DU COEUR DES FIBRES. LE DEPOT EST OBTENU AU MOYEN D'UNE COLONNE DE PLASMA 28, FORMEE DANS LE BARREAU GRACE A UN COUPLEUR HYPERFREQUENCE 18 APTE A INJECTER UNE ONDE PROGRESSIVE DE SURFACE DANS LA COLONNE DE PLASMA. PROCESS FOR MANUFACTURING PREFORMS FOR OPTICAL FIBERS AND A CHUCK THAT CAN BE USED FOR IMPLEMENTING THIS PROCESS, APPLICATION TO THE MANUFACTURING OF SINGLE-MODE OPTICAL FIBERS. ACCORDING TO THE INVENTION, A HOLLOW BAR OF SILICA 14 IS FORMED ON A CHUCK, BY AN EXTERNAL DEPOSIT METHOD USING A PLASMA TORCH, THE CHUCK IS REMOVED AND DEPOSITS, ON THE INTERNAL FACE OF THE BAR, A VITREOUS COATING 34 INTENDED FOR THE SUBSEQUENT FORMATION OF THE HEART OF FIBERS. THE DEPOSIT IS OBTAINED BY MEANS OF A PLASMA COLUMN 28, FORMED IN THE BAR BY A HYPERFREQUENCY COUPLER 18 SUITABLE TO INJECT A PROGRESSIVE SURFACE WAVE INTO THE PLASMA COLUMN.

Method and device for removing a mandrel during the production of a quartz glass pipe

According to known methods for producing a synthetic quartz glass pipe, a porous SiO2 blank is formed by deposition of SiO2 particles on the cylinder jacket surface of a mandrel rotating about its longitudinal axis, after which the mandrel is removed and the blank sintered. The aim of the invention is to provide, on the basis of the above, an economical method for the production of quartz glass pipes which simplifies the use of economical, cylindrical mandrels. To facilitate the removal of the mandrel (22),he invention provides for a face end (25) of the blank (6) to be fixed in a recess (11) having a passage (15) and a fixed counter support (13) made of a deformable mass, and for said end to be aligned in such a way that the mandrel (22) extends through the passage (15). The mandrel (22) is subjected to a tensile or pushing force which acts in the direction of the longitudinal axis (23) of the mandrel and by means of which the end (25) of the blank (6) is pressed against the counter support (13). Said force is increased continuously util the mandrel (22) detaches from the blank (6). The invention also relates to a suitable device for removing mandrels from blanks, which comprises a holding device (11; 17) for fixing and aligning the blank (6). Said device has a recess (11) for receiving one of the ends (25) of the blank (6). The recess is provided with a counter support (13) made of a deformable mass and has a passage (15) through which the mandrel (22) is able to pass. The device also comprises a pulling or pushing device (5) which engages the mandrel (22) and acts in the direction of the longitudinal axis (23) of same. By means of said device the end (25) of the blank (6) connected to the mandrel (22) can be moved against the counter support (13).

Production of synthetic quartz tube

(57)【要約】本公報は電子出願前の出願データであるた め要約のデータは記録されません。

Manufacturing method of quartz glass base material

A method of forming an optical fibre preform

Apparatus and method for heating porous preform

본 발명에 따른 다공질 모재의 가열 방법은, (a) 머플 튜브 내에 상기 다공질 모재를 실장하는 과정과; (b) 히터를 이용하여 상기 머플 튜브의 이동 경로에 고온 영역을 형성하는 과정과; (c) 상기 고온 영역을 통과하도록 상기 이동 경로를 따라 상기 머플 튜브를 이동시키는 과정을 포함한다. The method for heating a porous base material according to the present invention includes the steps of: (a) mounting the porous base material in a muffle tube; (b) forming a high temperature region in a movement path of the muffle tube using a heater; (c) moving the muffle tube along the travel path to pass through the hot zone. 다공질 모재, 소결, 머플 튜브, 이동 장치 Porous Matrix, Sintered, Muffle Tube, Transfer Device

Image display system with pixel mosaic pattern.

Glass base material manufacturing apparatus and glass base material manufacturing method

본 발명에 따른 광섬유 유리 모재 제조 장치는 상기 유리 모재가 둘레를 따라 형성된 베이스 로드, 상기 유리 모재인 가스재를 상기 베이스 로드 둘레를 따라 가수 분해 및 퇴적하는 버너, 상기 버너를 상기 베이스 로드의 길이 방향과 평행인 방향으로 이동시키는 제1 버너-이동-유닛, 및 상기 제1 버너-이동-유닛의 이동방향과 동일한 방향으로 상기 제1 버너-이동-유닛을 이동시키는 제2 버너-이동-유닛을 포함한다. An optical fiber glass base material manufacturing apparatus according to the present invention includes a base rod having a glass base material formed along a circumference, a burner that hydrolyzes and deposits a gaseous material that is the glass base material along the base rod circumference, and the burner in a longitudinal direction of the base rod A first burner-movement-unit for moving in the direction parallel to the second burner-movement-unit, and a second burner-movement-unit for moving the first burner-movement-unit in the same direction as the moving direction of the first burner-movement-unit; Include. 유리 모재, 베이스 로드, 버너, 제1 버너-이동-유닛, 제2 버너-이동-유닛 Glass Base, Base Rod, Burner, First Burner-Moving-Unit, Second Burner-Moving-Unit

Polishing device of glass rod and polishing method thereof

本发明一种玻璃棒的抛光设备及其抛光方法，属于光纤预制棒制造领域，涉及的是一种去除玻璃棒表面杂质的设备及其方法。包括车床、储气罐、罐体用加热带、气体管道、AV电磁阀、质量流量控制器、第一控温装置、第二控温装置、吹扫喷灯、移动滑台、左限位器、右限位器、旋转电机、移动电机和卡盘。其抛光方法为夹持待抛光玻璃棒并将吹扫喷灯移至移动滑台最左端；利用储气罐内气体吹扫玻璃棒表面；启动旋转电机和移动电机，移动滑台向右匀速移动；当吹扫喷灯移动到最右端时，抛光过程结束，关闭AV电磁阀、移动电机和旋转电机；检查玻璃棒表面情况，表面无杂质即合格；否则，将吹扫喷灯移至当前位置再次抛光。

Production of preformed optical glass

Horizontal lathe

一种卧式车床，它是光纤多孔质母材制造用的卧式车床，其把持目标的两端，使得目标的长度方向成为大致水平方向，从而固定目标，使目标以与长度方向平行的轴为旋转轴进行旋转，该卧式车床具有对目标的因旋转轴方向的热膨胀引起的尺寸变化进行吸收的热膨胀吸收机构。卧式车床具有：第1夹具爪，其把持目标的一端，构成为能够以旋转轴为中心进行旋转；以及第2夹具爪，其把持目标的另一端，构成为能够以旋转轴为中心进行旋转，热膨胀吸收机构是第2夹具爪被构成为能够沿目标的旋转轴方向移动的机构。

Method for manufacturing an article comprising a refractory a dielectric body

A refractory dielectric body is heated with a plasma fireball at conditions which do not result in substantial removal of a surface portion of the body, yet which are sufficient to reduce both surface and bulk impurities. Typically, the body is treated with the plasma in the absence of simultaneous deposition of material onto the body. Advantageously, an isothermal, oxygen or oxygen-containing plasma is utilized. The invention is useful for reducing chlorine impurities by at least about 30% to a depth of at least about 10 μm, with accompanying reduction of hydroxyl impurities. The invention thus provides a useful method for reducing the concentration of impurities that contribute to imperfections during the process of drawing fiber from an optical fiber preform, without requiring substantial removal of the surface of the preform.

Method and apparatus for producing a glass optical fiber preform by the external deposition method

Electric furnace extension method and extension apparatus for optical fiber glass preform

An electric furnace extending method and apparatus for an optical fiber glass body alignment when connecting the extension use body and pulling member and making it possible to immediately start the extension after the fusing of the connection portion. A centering mechanism for centering the free end portion of the body and member on the furnace center side is provided between the furnace pipe of the electric furnace and grips of the extension use glass body and between the furnace pipe and the pulling member. The free end portion is centered by this centering mechanism, then the gripped sides of the body and member are fixed, the front ends of the two free end portions are abutted and fused and bonded at the highest temperature portion inside the electric furnace, then the highest temperature portion is moved to the extension portion of the glass body side and the extending of the glass body is commenced.

Guartz glass tube having taper attached-groove and Method for manufacturing preform for opitical fiber using the same

본 발명은, 광파이버용 모재의 제조에 있어서, 정확하게, 또한 안정적으로 유지할 수 있는 모재용 석영유리관 또는 그것에 접속하는 보조석영유리관 및 그것을 사용한 광파이버용 모재의 제조방법을 제공하는 것을 과제로한 것이며, 그 해결수단으로서, 테이퍼가붙은 홈을 가진, 광파이버모재용 석영유리관 또는 이 광파이버모재용 석영유리관에 접속하는 보조석영유리관으로서, 그들의 유지쪽의 단부근처에 테이퍼가 붙은 홈이 형성되어 있는 것, 또한 석영유리관의 유지쪽단부면이 경면처리되어 있는 것을 특징으로 하는 석영유리관 및 그것을 사용한 광파이버용 모재의 제조방법을 제공한다.

Production method of optical fiber preform, and production method of optical fiber

A production method of an optical fiber preform includes first preparing a first preform having a plurality of glass preforms and a first cladding portion disposed between the plurality of glass preforms, and first arranging a second cladding portion to surround the first preform. At the first arranging, a material gas and a combustion gas are ejected from a burner to produce glass particles. The first preform and the burner are moved relative to each other in a longitudinal direction of the first preform. The glass particles are deposited on the first preform.

Production of optical fiber preform

Method and device for the removal of a mandrel from a porous SiO2 blank

Low water peak optical waveguide fiber and method of manufacturing same

A cylindrical glass body having a low water content centerline region and method of manufacturing such a cylindrical glass body for use in the manufacture of optical waveguide fiber is disclosed. The centerline region of the cylindrical glass body has a water content sufficiently low such that an optical waveguide fiber made from the cylindrical glass body of the present invention exhibits an optical attenuation of less than about 0.35 dB/km, and preferably less than about 0.31 dB/km at a measured wavelength of 1380nm. A low water content plug (46, 54) used in the manufacture of such a cylindrical glass body, an optical waveguide fiber having a low water peak, and an optical fiber communication system incorporating such an optical waveguide fiber is also disclosed.

Plasma process for the production of a dielectric rod

A plasma process for the production of a dielectric rod 6 from gaseous starting materials, causes the rod 6 to grow in the axial direction by deposition on its end face. This is effected by conducting microwave energy via the rod 6 to its end face, this energy maintaining a gaseous discharge 7 at the end face. The starting material flows into this gaseous discharge as a gaseous jet by means of a concentric nozzle system 8.

Apparatus for producing porous glass preform

A production apparatus capable of suppressing the generation of rusts on a base material gripper (5) and a rotation mechanism (2) is provided in a production of a porous glass preform for an optical fiber. In an apparatus for producing a porous glass preform by depositing glass fine particles, produced by a flame hydrolysis reaction using a burner (7), on a starting member (11) gripped by a base material gripper (5) in a reaction vessel (4), the base material gripper (5) is covered with a cover (6) , and gas is supplied to the inside of the cover (6) and the gas is caused to flow from the inside of the cover (6) to an inside of the reaction vessel (4), thus preventing exposure of the base material gripper (5) and the rotation mechanism (2) to hydrogen chloride gas coming from the flame hydrolysis reactions.

Method of manufacturing large-scale optical fiber prefabricating stick cladding

本发明公开了一种大尺寸光纤预制棒包层的制备方法，其是在沉积室顶部的机械连接头上连接一个竖直度矫正构件，再将靶棒的上端连接在该竖直度矫正构件上，对竖直度矫正构件的局部加热使其受热部位变软，之后在转动竖直度矫正构件和靶棒的同时在靶棒上作用一个向侧向施力的调节器，直至调节器将靶棒扶至竖直，之后停止加热，撤离调节器，点燃沉积喷灯沉积包层积粉体；沉积结束后，将由耙棒和包层积粉体构成的组合体移出沉积室，再置入高温炉进行玻璃化处理，竖直度矫正构件保留原位重复利用。本发明避免了耙棒和包层积粉体的组合体的弯曲，从而解决了当预制棒尺寸较大时，预制棒的弓曲度过大的问题，并且使制得的大尺寸光纤预制棒满足拉丝要求。

Base material for optical fiber, optical fiber, and method for production thereof

Base material for optical fiber, optical fiber, and method for production thereof

本发明提供一种光纤用母材的制造方法以及使用该方法制造的光纤用母材，该制造方法包括：通过熔接将至少两根纤芯母材(70)结合成1根纤芯母材的工序；将纤芯母材(70)的两端熔接一对预制用玻璃棒(61、62)而制成出发材料玻璃棒的工序；在出发材料玻璃棒的外周围堆积通过火焰加水分解反应生成的玻璃微粒子，制成多孔质母材(80)的工序；通过烧结将多孔质母材(80)透明玻璃化，制成包含纤芯部及外包部的光纤用母材(310)的工序。

Method of producing a preform for optical fibers

The present invention relates to a method of manufacturing a solid glass preform (103) from which single mode optical fiber is drawn showing low transmission loss in the 1360 to 1460 nm (E-band) wavelength region. The method comprises the steps of depositing porous silica based materials on a rotating hollow tapered cylindrical member, starting from glass-forming precursors.

Plasma deposition process for producing an optical preform with a cladding glass layer composed of fluorine-doped quartz glass

Device for producing optical fiber preform

(57)【要約】本公報は電子出願前の出願データであるた め要約のデータは記録されません。

Manufacutre of optical fiber preform

(57)【要約】本公報は電子出願前の出願データであるた め要約のデータは記録されません。

METHOD FOR PRODUCING GLASS FEDERS OF HIGH PUREITY, IN PARTICULAR OF OPTICAL WAVE GUIDES

Apparatus for supporting article in heating furnace