Method of producing primary preform for optical fibres, primary preform, final preform, optical fibre

FIELD: manufacturing technology.

SUBSTANCE: invention relates to production of optical glass fiber primary preform. Method of primary blank producing consists in using internal plasma-chemical deposition from vapor phase, wherein doped or non-doped glass-forming precursors are supplied to hollow glass base tube inner side, reaction zone in form of plasma is moved back and forth along said hollow glass base tube length between turning point near supply side and turning point near outlet side of hollow base tube, wherein base tube is installed in furnace and such conditions are created in said reaction zone, that one or more of glass layers packets composed of at least two separate glass layers are deposited on said base tube inner side.

EFFECT: technical result consists in preparing primary workpieces having large used length, effect on optical narrowing can be made independently from geometric contraction, refraction index and/or cross section area can be accurately set depending on primary blank position in longitudinal direction.

17 cl, 12 dwg

 



 

Same patents:

FIELD: process engineering.

SUBSTANCE: invention relates to multiple nozzle plasma tubular burner-precipitator for production of semis for optical fibres. Flow of medium is fed to the burner including initial glass material and carrier gas to allow burner lengthwise axis perpendicular orientation relative to substrate central axis. First partial flow of first gas or gas mix, in particular, precursor gas is fed from the burner bottom side and substrate via at least one nozzle extending in burner horizontal axis. Second partial precursor gas is fed via extra nozzle so that partial flows are combined nearby substrate. Burner comprises means for feeding of one doping additive with the help of precursor gas.

EFFECT: higher efficiency of silicon dioxide particles precipitation.

22 cl, 2 dwg

FIELD: physics.

SUBSTANCE: deposition of layers of quartz glass of a reflecting cladding is carried out with constant concentration of fluorine, and layers of the core are deposited with variation thereof - with decrease of the concentration of fluorine from the periphery to the centre. Deposition of the layers of quartz glass and fluorination thereof are carried simultaneously in one passage of the burner, wherein for concentration of fluorine in the layers of the core less than 0.5 at %, consumption of the fluorine-containing gas is reduced uniformly from layer to layer. The process of depositing layers of the reflecting cladding is carried out with equimolar ratio of silicon tetrachloride and oxygen in the vapour-gas mixture, where the carrier gas for the SiCl4 vapour used is gaseous SiF4. Further, the method includes high-temperature compression of the pipe into a rod workpiece and drawing a light guide therefrom.

EFFECT: low level of intermodal dispersion, which widens the transmission bandwidth of optical communication systems.

4 cl, 2 dwg, 1 tbl

FIELD: physics.

SUBSTANCE: method enables to adjust the diameter of a workpiece by depositing a layer of especially pure quartz glass. The method includes high-temperature heating of a workpiece with an oxyhydrogen torch in the flame of which tetraethoxysilane vapour is fed. Tetraethoxysilane is fed via saturation thereof with oxygen vapour which is bubbled through liquid tetraethoxysilane.

EFFECT: reduced loss of workpiece glass due to evaporation thereof at high temperatures of the production process thereof.

2 ex

FIELD: chemistry.

SUBSTANCE: method of manufacturing workpieces includes supply of mixture of molecular gas reagents, containing nitrogen, oxygen and silicon atoms into support tube, excitation of UHF discharge in it, formation of plasma column, provision of its scanning along support tube and precipitation of products of reaction, taking place in mixture, onto internal surface of support tube. Mixture of molecular gas reagents is additionally supplied into second support tube, UHF discharge is excited in it, plasma column is formed, its scanning along support tube is realised, precipitation of reaction products on internal surface of support tube, synchronous movement of plasma columns in first and second support tubes, transmission of power from region of plasma column of second support tube to region of plasma column of first support tube, measurement and regulation of temperature of first support tube surface by measurement of transmitted power from region of plasma column of second support tube to region of plasma column of first support tube depending on measured temperature, are carried out.

EFFECT: elaboration of mode of manufacturing optical fibres on the basis of nitrogen-doped quartz glass with provision of stabilisation and smooth control of temperature in region of plasma column of support tube, with reduction of time for installation of required tube temperature and with increased accuracy of temperature adjustment.

12 cl, 2 dwg

FIELD: physics, optics.

SUBSTANCE: invention relates to fibre-optics and can be used in making anisotropic single-mode fibre light guides. The method involves making a cylindrical workpiece by MCVD method, which has a core, a low-viscosity tensive cladding and a structural cladding. Two grooves are made at diametrically opposite sides of the workpiece, followed by high-temperature rounding of the workpiece and drawing of the fibre. The structural cladding consists of quartz glass doped with P2O5 and/or B2O3 and/or F additives in an amount which enables to lower the compression and rounding temperature by 100-150C.

EFFECT: longer outer diameter of the workpiece, low mass transfer of the quartz glass and high efficiency of the process.

FIELD: metallurgy.

SUBSTANCE: proposed device comprises applicator with inner and outer walls and microwave waveguide that enters said applicator. The latter extends around cylindrical axle and has passage adjoining the inner wall for microwaves to flow therein. Bearing tube can be arranged under said cylindrical axle. Said bearing tube and applicator are, in fact, aligned. Applicator is completely surrounded by kiln located above said cylindrical axle In deposition of layers, glass-forming precursors are fed onto inner surface of glass bearing tube to locate the kiln above tube part and applicator and feed microwave power in applicator to create plasma conditions inside said tube. Said applicator and kiln reciprocate along said tube. Note here that kiln part differs from that of applicator.

EFFECT: perfected method.

14 cl, 2 ex, 3 dwg

FIELD: physics.

SUBSTANCE: invention relates to methods of method chemical vapour deposition (MCVD) for making low-attenuation optical fibres for communication systems, sensors for physical quantities and transmission of powerful optical radiation. According to the method, the deposited glass layers of the core are doped with small additives of hydrogen or deuterium oxides with content of vapour of said substances in the gas phase from 0.017 to 1 mol %.

EFFECT: reduced viscosity of the glass of the core, preventing reduction of germanium dioxide.

1 tbl

FIELD: technological processes.

SUBSTANCE: invention relates to manufacturing of quartz stocks of single-mode fibre waveguides for fibre-optic lines of communication, development of fibre lasers and amplifiers, various fibre-optic sensors. Only a core of a stock is deposited by gas phase deposition in SHF plasma of lower pressure to the inner surface of a thick-wall quartz or fluorosilicate support pipe with wall thickness of 8-10 and more mm. Deposition is carried out in SHF plasma of lower pressure in the range of 1-30 torr, developed by combined SHF plasmotron of resonator type on type of oscillations TM010 and TE111 with simultaneous combination of resonance frequencies, but with various distribution of electromagnetic fields. SHF plasmotron is an SHF resonator device on the type of oscillations TM010 and TE111 with simultaneous combination of resonance frequencies, but various distribution of electromagnetic fields.

EFFECT: increased efficiency of single-mode fibre waveguide stocks manufacturing process and general reduction of cost to produce quartz single-mode fibre waveguides.

8 cl, 3 dwg

FIELD: physics.

SUBSTANCE: optical fibre workpiece is made by depositing mass of porous quartz glass onto the periphery of a glass rod. The mass of the porous quartz glass is vitrified via thermal treatment of the glass workpiece. The workpiece has a part which is suitable for stretching until optical fibre is obtained, and defective part on both ends of the suitable part. During vitrification, part of the mass of the porous quartz glass in the defective part shifts along the axial direction of the glass rod. When the mass of the porous quartz glass shifts, tension between the glass rod and the mass of the porous quartz glass relaxes.

EFFECT: making a large-size workpiece and possibility of vitrifying mass of porous quartz glass while simultaneously preventing cracking, delamination and dislocation.

15 cl, 12 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to the technology of manufacturing tubular quartz workpieces of high-aperture, multimode fibre-optic guides. A core made from quartz glass doped with fluorine (n1) is initially deposited, followed by a reflecting fluorosilicate classing with n2<n1. The apparatus - a microwave plasmatron for manufacturing quartz workpieces - is fitted with a sensor for monitoring microwave power reflected from the input of the plasmatron, a temperature sensor for the temperature of the rod, an electrically controlled attenulator connected between a master generator an amplifier, and a program for controlling the process of manufacturing workpieces of fibre-optic guides using a computer.

EFFECT: high efficiency of manufacturing quartz workpieces of light guides by widening the range of quartz workpieces, and low power consumption.

2 dwg

FIELD: optical fibers production techniques.

SUBSTANCE: the invention is dealt with optical fibers production techniques. For production of optical fiber billets particles of a glass first are synthesized in the oxygen-hydrogenous torch flame. Production a porous billet is made by settling the particles in a radial direction on the external surface of the parent element with following sintering of the porous billet. At that definite ratio between the speed of flow of a starting gaseous material or a gas mixture consisting of the starting gaseous material and an additive gas and a speed of flow of a noble gas should be maintained. The torch has four channels for feeding of gases. The sizes of channels of the torch ensure the definite ratio of the indicated speeds.

EFFECT: The invention ensures an increase of quality of the optical fiber billets.

4 cl, 2 dwg

FIELD: methods of optical fibers production.

SUBSTANCE: the invention is pertaining to the methods of production of optical fibers and may be used in production of quartz fiber light guides. The device represents installed on a frame in a protective jacket following components: a mandrel and a holder, a unit of rotation and reactor of spraying. On the frame also there are guides and the lower mobile platform. The second guides limited from above by a small frame are fixed on the upper base of the frame. On the second guides there are two more fixed mobile platforms. All three platforms are coupled by a common combined shaft enabling the platforms to move synchronously or with different ratios of speeds. One of the mobile platforms - the upper one - is mounted on the upper part of the frame and contains an assembly of fixation of the mandrel and the holder, one of the bases of which has the form of a polyhedron and contacts to the unit of rotation; another platform is supplied with a dehydration furnace. The protecting jacket is made in the form of a couple of the flutes mounted on the both sides of the upper platform and consists of two parts of the similar volume. The similar jacket is fixed on the lower mobile platform and has a docking unit of coupling with the reactor of spraying or with a glazing furnace. The invention ensures an increase of the final length of the light guides and an increased yield of the product.

EFFECT: the invention ensures an increased final length of the light guides and the increased yield of the product.

1 dwg

FIELD: fiber-optic communication; medicine; opto-and- microelectronics; methods of production of quartz blanks of the fiber light guides.

SUBSTANCE: the invention is pertaining to the methods of production of quartz blanks of fiber light guides by a deposition from a gas phase and may be used in various systems of a fiber-optic communication, medicine, opto-and- microelectronics. The method is based on a deposition of layers of a shell and a core on an exterior surface of a support quartz pipe made out of engineering quartz glass, which in the further is etched out in the process of a collapse into a stud-plank in the result of passing through it of a mixture of the chemically reactive gases (for example, SF6) with oxygen. At that the support quartz pipe is tightly set on a metal pipe forming a metal-dielectric wave-guiding structure necessary for excitation and propagation along it of an UHF-discharge on a surface wave. Relocation of the front of the UHF-discharge is carried out by modulation of the fed to the metal-dielectric wave-guiding structure of the UHF-power. The method ensures a capability of shaping of blanks of the light guides practically of any types and compositions, and also allows to refuse the high-quality and high-expensive quartz pipes, to reduce the prime cost of the produced blanks, to increase the factory length of the light guides due to an increase of diameter of molded blank.

EFFECT: the invention allows to shape the light guides blanks of any types and compositions, to refuse the high-quality and high-expensive quartz pipes, to reduce the prime cost of the produced blanks, to increase their factory length.

FIELD: optical engineering.

SUBSTANCE: single-mode optical fiber has light-conducting part (4) of core, internal part (3) of envelope which surrounds part 4 of core and area of coating which surrounds the internal part (3) of envelope. Refractivity factor of core part 4 excesses refractivity factors of area 1 and 3 of envelope which are almost equal. Internal part (3) of envelope is made of SiO2 which includes doping fluoride in amount of 0,1-8,5 mass percent which results to compressing axial force of part 4 of core along its whole cross-section. Internal part 3 of envelope is additionally provided with doping additives to increase refraction and to get refractivity factor being practically equal to refractivity factor of area 1 of coating. Tube base is made of silicon dioxide and the base functions as area of coating. Internal part of envelope and area of core are formed by means of one or several reaction-capable gases. After they are formed the tube of base is subject to shrinkage and elongation to single-mode optical fiber. Single-mode optical fiber produced has low hydrogen-induced attenuation at 1500 nm wavelength.

EFFECT: lower hydrogen-induced attenuation.

15 cl, 8 dwg

FIELD: fiber optics; manufacture of single-mode fiber light conduits at high double refraction used in information transmission systems and interferometric sensors of physical fields.

SUBSTANCE: proposed method increases ellipticity of straining envelope and high-temperature treatment of blanks. Proposed method includes obtaining blanks of fiber light conduits by application on inner surface of quartz tube layers of quartz glass alloyed with P2O5 together with fluorine by chemical vapor-phase deposition method, straining envelope, insulating envelope and layer of core, collapsing tube into molding fillet, abrasive treatment of diametrically opposite outer sides of blank-molding fillet by cutting symmetrical grooves along axis over entire length, 0.3-1 mm deep at depth sufficient for penetration in layer of protective envelope so that gap between bottom of groove and straining envelope is formed; then it is subjected to holding in hydrofluoric acid solution till width of groove in layer of protective envelope increases by 2-2.5 times after which blank is subjected to rounding and light conduits are drawn. Prior to drawing light conduits, blanks shall be annealed in air atmosphere at temperature of 900-1000°C for 4-10 h.

EFFECT: enhanced retaining of radiation polarization; reduced optical losses of light conduits.

2 cl, 2 dwg, 1 ex

FIELD: glass industry; methods of manufacture of the optical glass.

SUBSTANCE: the invention is pertaining to the field of glass industry, in particular, to the method of manufacture of the optical glass. The invention provides that the number of the remained bubbles with the diameter of 0.3 mm and more makes 0.005 pc/cm3 or less per the unit of the volume of the optical glass. Such optical glass is produced at regulation of the temperature of the torch butt surface for the synthesis of glass In the process of deposition of the glass particles by regulation of the ratio of the speed of the flow or the volume of the flow between the combustible gas and the gas, which is sustaining combustion. The technical problem of the invention is prevention of destruction of the torch used for the synthesis of the optical glass and provision of manufacture of the optical glass of the stable quality.

EFFECT: the invention ensures prevention of destruction of the torch used for the synthesis of the optical glass and provision of manufacture of the optical glass of the stable quality.

4 cl, 4 ex, 4 dwg

FIELD: glass industry; methods of production of the optical fibers used for the high-speed data transmission.

SUBSTANCE: the invention is pertaining to the field of glass industry, in particular, to the method of manufacture of the optical fibers used for the high-speed data transmission. The method includes the following stages: i) feeding of one or several source substances for production of the glass and possibly the additive compound in the quartz tube-substrate; ii) creation of the plasma in the quart tube-substrate for provision of the reaction in the chemically active mixture for production of the glass layers, which may include or not include the additive compound on the internal side of the tube-substrate; iii) the collapse of the tube-substrate produced at the stage ii) into the billet at heating; iv) drawing the optical fiber from the billet at heating. The glass layers are settled on the section having the greatest diameter of 10 microns in the center of the drawn optical fiber. At least one of the indicated layers has the greatest area of the surface of 2 micron2, and the value of the index of refraction inside each layer is increasing in the direction to the center of the fiber. The technical result of the invention is development of the optical fiber capable to transmit information with the speed exceeding 1 Gigabit per a second.

EFFECT: the invention ensures development of the optical fiber capable to transmit the data with the speed exceeding 1 gigabit per a second.

9 cl, 1 tbl, 4 ex

FIELD: production of fiber-optic light conduits.

SUBSTANCE: proposed method includes settling of glass-forming oxides on seed bead by delivery of vapor-gas mixture of halogenides of respective elements to flame of burner which moves along bead. Vapor-gas mixture is fed to circular clearance between seed bead and tube located coaxially relative to it and mounted together with burner on movable support of machine. Tube moves in synchronism with burner and vapor-gas mixture is fed at angle of 10-60° to axis of seed bead. Width of circular clearance is set between 0.8D and 1.5D, where D is diameter of jet of vapor-gas mixture at circular clearance inlet; length of tube is set between 10h and 30h, where h is width of circular clearance.

EFFECT: enhanced efficiency of settling of aerosol oxides on blank of fiber-optic light conduit.

4 ex

FIELD: glass industry; methods of manufacture of the optic fibers.

SUBSTANCE: the invention is pertaining to glass industry, in particular, to the method of manufacture of the optic fiber. The offered method of manufacture of the optic fiber is pertaining to field of production of the fiber light guides used in the optical cables for transmission of information. The technical result of the invention is simplification of the process of manufacture of the optic fiber, decrease of the dimensions of the fibers and the optical cable. The purpose of the presented method is production of the light guide cladding and the light guide core by irradiation of the blank of the optic fiber made out of the homogeneous chemical substance, predominantly - silicon dioxide, with the neutron flux with the strictly set depth of their absorption.

EFFECT: the invention ensures simplification of the process of manufacture of the optic fiber, the decreased dimensions of the fibers and the optical cable.

8 dwg, 2 tbl

FIELD: glass industry; other industries; methods and the devices of production of the optical fibers.

SUBSTANCE: the invention presents the method and the device for manufacture of the billet of the optical fiber with usage of the simultaneous plasma deposition on the internal and external surfaces of the initial tube. At rotation of the initial tubular element conduct the selective injection of the chemicals in the plasma torch and the chemicals flowing through the cavity of the tube. The plasma torch is moved along the tubular element for the simultaneous deposition of the carbon-black on the internal and external surfaces. The carbon-black on one or both surfaces can be condensed into the layer of quartz glass after its deposition. Then the plasma torch again is moved for deposition of the additional carbon-black and-or for consolidation of the before deposited carbon-black on one or both surfaces. The process is repeated until enough silicon dioxide is deposited on the tubular element. After that the tubular element is flattened. The additional plasma deposition can be made during this flattening or after it. The technical problem of the invention is to increase productivity at production of the billets of the optical fibers and the fibers of the big diameter.

EFFECT: the invention ensures the increased productivity at production of the billets of the optical fibers and the fibers of the big diameter.

35 cl, 7 dwg

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