Class / Patent application number | Description | Number of patent applications / Date published |
065391000 | Plasma utilized | 31 |
20080250817 | Method and Apparatus for Manufacturing an Optical Fiber Preform - The invention embraces a method for manufacturing an optical fiber preform. The primary preform is overcladded by projecting silica grain under a plasma torch, wherein, during overcladding, at least one region adjacent to the plasma torch is cooled by gas provided by at least one cooling nozzle. The invention facilitates low-cost preform overcladding in a way that limits the incorporation of impurities into the silica overcladding. | 10-16-2008 |
20080271494 | Method for making an optical preform - The present invention relates to a method for manufacturing a preform for optical fibers via a vapor deposition process in which the position of the reversal point near the substrate tube's supply side shifts along the longitudinal axis of the substrate tube during at least part of the deposition process. | 11-06-2008 |
20080295541 | METHOD OF MANUFACTURING AN OPTICAL FIBER PREFORM USING A HIGH FREQUENCY INDUCTION THERMAL PLASMA - When manufacturing an optical fiber preform by feeding at least glass raw material, dopant material and oxygen gas to a high frequency induction thermal plasma torch to synthesize glass particles in plasma therein, a glass rod is rotated and reciprocated relative to the plasma torch to deposit the synthesized glass particles onto the glass rod. The fluctuation of the relative refractive-index difference in the longitudinal direction of the optical fiber preform is suppressed and the average value of the relative refractive-index difference in the longitudinal direction is enhanced. The glass raw material is fed to the plasma torch in a forward direction of the reciprocating motion of the glass rod, and a feeding amount of the glass raw material in the backward direction of the reciprocating motion is reduced relative to the feeding amount in the forward direction. | 12-04-2008 |
20090078006 | Method for Forming an Improved Weld Between a Primary Preform and a Silica Bar - The invention relates to a method for welding one end of a primary preform and one end of a silica bar having different properties. The method includes the steps of projecting and fusing silica grain under a plasma torch onto an end of the primary preform and an end of the silica bar, and bringing into contact these respective ends to form an excellent weld between the primary preform and the silica bar. The invention provides a cost-effective way to secure a primary preform to a glass-working lathe support while reducing the risk of costly preform breakage. | 03-26-2009 |
20090126407 | Methods for making optical fiber preforms and microstructured optical fibers - A method of making an optical fiber preform includes depositing silica glass on the inside of a tube substrate via a plasma chemical vapor deposition (PCVD) operation. The parameters of the PCVD operation are controlled such that the silica glass deposited on the interior of the tube substrate contains a non-periodic array of voids in a cladding region of the optical fiber preform. The optical fiber preform may be used to produce an optical fiber having a core and a void containing cladding. The core of the optical fiber has a first index of refraction and the cladding has a second index of refraction less than that of the core. | 05-21-2009 |
20090173107 | METHOD FOR MANUFACTURING A PREFORM AS WELL AS A METHOD FOR FORMING OPTICAL FIBRES FROM SUCH A PREFORM - A method for manufacturing a preform for optical fibers by means of a vapour deposition process, wherein plasma conditions are created and wherein the plasma is moved back and forth along the longitudinal axis of the hollow substrate tube between a reversal point near the supply side and a reversal point near the discharge side of the hollow substrate tube, so that the location where the soot deposition associated with one phase takes place is axially spaced from the location where the soot deposition associated with the other phase(s) takes place. | 07-09-2009 |
20090260400 | Method for Producing a Tubular Semifinished Product From Fluorine-Doped Quartz Glass - To improve a generally known method for producing a tubular semifinished product from fluorine-doped quartz glass such that it is possible to produce a tubular semifinished product of fluorine-doped quartz glass with an inner bore of high quality while the efforts for making or treating the same are as small as possible, the present invention suggests a method comprising the following steps: (a) providing a substrate tube consisting of fluorine-doped quartz glass; (b) forming, in a deposition process, SiO | 10-22-2009 |
20100095707 | FABRICATING OPTICAL WAVEGUIDES - Methods and devices are provided for fabricating waveguides. Some such methods involve forming at least a portion of the waveguide using an embossing process for shaping a substrate and/or other components. Some implementations provide processes for making waveguide features by omitting what may previously have been regarded as essential steps in forming waveguides via a semiconductor fabrication process. Some implementations provide processes of forming waveguide features by deliberately causing what would heretofore have been regarded as defects in a semiconductor fabrication process. Some such methods and devices can produce waveguides at a substantially lower cost than was heretofore possible. | 04-22-2010 |
20100154479 | Method and Device for Manufacturing an Optical Preform - Disclosed is a method and device for manufacturing an optical preform. The method includes supplying dopant-containing glass-forming gases to the interior of a hollow glass substrate tube. Furthermore, the supply flow of dopant-containing glass-forming gases includes a main gas flow and one or more secondary gas flows. The secondary gas flows are divided into subflows, which are supplied to the interior of the hollow glass substrate tube together with the main gas flow. The method further includes effecting deposition of glass layers on the interior surface of the hollow glass substrate tube. | 06-24-2010 |
20100162768 | METHOD AND APPARATUS FOR MANUFACTURING OPTICAL FIBER PREFORM USING HIGH FREQUENCY INDUCTION THERMAL PLASMA TORCH - Provided is an optical fiber preform manufacturing method comprising supplying a high-frequency induction thermal plasma torch with at least glass raw material, dopant raw material, and oxygen, and depositing the glass particles synthesized in the plasma flame onto a surface of a glass rod that moves backward and forward relative to the plasma torch while rotating, wherein the plasma flame is narrowed such that at least a portion of the glass particles continuously formed by the plasma flame are not deposited on the glass rod. As a result, the fluorine concentration in the cladding is increased to improve the relative refractive index difference of the preform. | 07-01-2010 |
20100162769 | METHOD AND APPARATUS FOR MANUFACTURING OPTICAL FIBER PREFORM USING HIGH FREQUENCY INDUCTION THERMAL PLASMA TORCH - Provided is an apparatus and method for manufacturing an optical fiber preform by supplying a high-frequency induction thermal plasma torch with at least glass raw material, dopant raw material, and oxygen, and depositing the glass particles synthesized in the plasma flame onto a surface of a glass rod that moves backward and forward relative to the plasma torch while rotating, wherein deposition of the glass particles is performed while cooling the glass rod. As a result, the concentration of fluorine doped in the cladding increase, thereby improving the relative refractive index of the preform. | 07-01-2010 |
20100186453 | METHOD FOR THE PRODUCTION OF A BLANK MOLD FOR OPTICAL FIBERS - In a known method for the production of a blank mold for optical fibers, a fluorine-doped SiO | 07-29-2010 |
20110016926 | METHOD OF MANUFACTURING OPTICAL FIBER PREFORM USING PLASMA TORCH - A method of manufacturing an optical fiber preform by depositing glass fine particles onto a surface of a glass rod while the glass rod is reciprocated relative to a plasma torch, including: moving the glass rod in a first direction relative to the plasma torch while the plasma torch is applied to the glass rod and supplied at least with a dopant material and a glass material to deposit the glass fine particles onto the surface of the glass rod, in such a manner that a plasma power is set higher during a first time interval starting from a beginning of the movement of the glass rod in the first direction than during a second time interval starting from an end of the first time interval; and moving the glass rod in a second direction relative to the plasma torch, where the second direction is opposite to the first direction. | 01-27-2011 |
20110056245 | METHODS FOR MODIFYING OVALITY OF OPTICAL FIBER PREFORMS - Methods for modifying preform core ovality during and subsequent to the formation of an optical fiber preform. After MCVD deposition forms the core rod, but prior to overcladding of the core rod, the code rod may be etched to change its ovality. In order to etch the core rod, the core rod may be mounted to lathe, rotated by at least two rotors, and subjected to a heat source. Additionally, one of the at least two rotors may be phase-shifted from another one of the at least two rotors after the core rod is mounted on the lathe. | 03-10-2011 |
20110100061 | Formation of microstructured fiber preforms using porous glass deposition - A method of making a microstructured optical fiber preform uses the plasma fusion of a powder layer deposited onto a substrate under conditions that prevent the deposited layer from completely densifying, thereby yielding the formation of bubbles within the layer. By systematic control of powder melt and delivery, while maintaining the process temperature below a temperature associated with densifying the deposited layer, the powder particles densify only partially on the substrate and create bubbles of a fairly narrow (and thus controllable) diameter range within a defined region of the preform. Upon drawing a fiber from the preform, the bubbles will extend into gas lines, forming a desired microstructure arrangement. | 05-05-2011 |
20110100062 | REFRACTION-SENSITIVE OPTICAL FIBER, QUARTZ GLASS TUBE AS A SEMI-FINISHED PRODUCT FOR THE MANUFACTURE-THEREOF AND METHOD FOR THE MANUFACTURE OF THE FIBER - A known refraction-sensitive optical fiber comprises a core zone with an index of refraction n | 05-05-2011 |
20110162413 | METHOD OF MANUFACTURING OPTICAL FIBER BASE MATERIAL - Provided is a method of manufacturing an optical fiber base material having at least four layer including a core, a first cladding, a second cladding containing fluorine, and a third cladding. The manufacturing method comprises preparing a starting base material that includes the core and the first cladding; forming a porous intermediate glass base material by supplying glass raw material and oxygen to a high-frequency induction thermal plasma torch to synthesize glass fine particles that are then deposited on a surface of the starting base material; forming an intermediate glass base material that includes the core, the first cladding, and the second cladding containing fluorine, by heating and vitrifying the porous intermediate glass base material in an atmosphere containing fluorine; and providing the third cladding on the outer surface of the intermediate glass base material. | 07-07-2011 |
20110232332 | RING PLASMA JET METHOD AND APPARATUS FOR MAKING AN OPTICAL FIBER PREFORM - A method and apparatus for making an optical fiber preform, including injecting a plasma gas source into the first end of a tubular member; generating a ring plasma flame with the plasma gas source flowing through a plasma gas feeder nozzle, the plasma gas feeder nozzle including: an inner tube, an outer tube, wherein the plasma gas source is injected between the inner tube and the outer tube to produce the ring plasma flame, such that at least a portion of the ring plasma flame is directed radially toward the inner surface of the tubular member; traversing the tubular member along the longitudinal axis relative to the plasma flame; depositing at least one soot layer on the interior surface of the tubular member by introducing reagent chemicals into the plasma flame; and fusing all of the soot layers into a glass material on the interior surface of the tubular member. | 09-29-2011 |
20110247368 | INTERNAL VAPOUR DEPOSITION PROCESS - A method for manufacturing a primary preform for optical fibres using an internal vapour deposition process, including the steps of: i) providing a hollow glass substrate tube having a supply side and a discharge side, ii) surrounding at least part of the hollow glass substrate tube by a furnace, iii) supplying doped or undoped glass-forming gases to the interior of the hollow glass substrate tube via the supply side thereof, iv) creating a reaction zone in which conditions such that deposition of glass will take place on the interior of the hollow glass tube are created, and v) moving the reaction zone back and forth along the length of the hollow glass substrate tube between a reversal point located near the supply side and a reversal point located near the discharge side of the hollow glass substrate tube, wherein, during at least part of step v), the gas flow comprises a first concentration of fluorine-containing compound when the reaction zone is moving in the direction of the discharge side. | 10-13-2011 |
20110247369 | INTERNAL VAPOUR DEPOSITION PROCESS - A method for manufacturing a primary preform for optical fibres using an internal vapour deposition process, including the steps of: i) providing a hollow glass substrate tube having a supply side and a discharge side, ii) surrounding at least part of the hollow glass substrate tube by a furnace, iii) supplying a gas flow, doped or undoped, of glass-forming gases to the interior of the hollow glass substrate tube via the supply side thereof, iv) creating a reaction zone in which conditions such that deposition of glass will take place on the interior of the hollow glass tube are created, and v) moving the reaction zone back and forth in longitudinal direction over the hollow glass substrate tube between a reversal point located near the supply side and a reversal point located near the discharge side of the hollow glass substrate tube. | 10-13-2011 |
20110302966 | METHOD FOR MANUFACTURING A PRIMARY PREFORM - The present invention relates to a method for manufacturing a primary preform for optical fibres, using an internal vapour deposition process, wherein a gas flow of doped undoped glass-forming gases is supplied to the interior of a hollow substrate tube having a supply side and a discharge side via the supply side thereof, wherein deposition of glass layers on the interior of the substrate tube is effected as a result of the presence of a reaction zone. | 12-15-2011 |
20120036896 | Method of Manufacturing an Optical Fibre Preform - The present invention relates to a method for manufacturing a preform for optical fibres, wherein deposition of glass-forming compounds on the substrate takes place. The present invention furthermore relates to a method for manufacturing optical fibres, wherein one end of a solid preform is heated, after which an optical fibre is drawn from said heated end. | 02-16-2012 |
20120312054 | APPARATUS AND METHOD FOR MAKING AN OPTICAL FIBER PREFORM - Apparatus and methods for making an optical fiber preform at low cost avoiding the apparatus from being damaged are provided. Apparatus for making an optical fiber preform by depositing glass particles on the circumferential surface of a glass rod comprises: a chamber, a plasma torch, a glass particle supplying part, a composition modification gas supplying part, and an exhaust part. The chamber surrounds the heating portion of the glass rod heated by the plasma torch. The plasma torch heats the glass particles by a plasma flame. The glass particle supplying part introduces glass particles towards the heating portion of the glass rod in the chamber. The composition modification gas supplying part introduces composition modification gas into the chamber in order to modify the composition of the glass particles to be deposited on the heating portion of the glass rod in the chamber. | 12-13-2012 |
20120324958 | METHODS FOR MANUFACTURING OPTICAL FIBER PREFORM AND METHODS FOR MANUFACTURING OPTICAL FIBER - A method for manufacturing an optical fiber preform, including: a) providing a lining tube as a substrate tube, and doping and depositing by a PCVD or an MCVD process; b) in the reacting gas of silicon tetrachloride and oxygen, introducing a fluorine-containing gas for fluorine doping, introducing germanium tetrachioride for germanium doping, ionizing the reacting gas in the lining tube through microwaves to form plasma, depositing the plasma on the inner wall of the lining tube in the form of glass; c) after the completion of deposition, processing the deposited lining tube into a solid core rod by melting contraction through an electric heating furnace; d) sleeving the solid core rod into a pure quartz glass jacketing tube and manufacturing the two into an optical fiber preform; and e) allowing the effective diameter d of the optical fiber preform to become between 95 and 205 mm. | 12-27-2012 |
20130067960 | METHOD FOR MANUFACTURING A PRIMARY PREFORM FOR OPTICAL FIBRES, PRIMARY PREFORM, FINAL PREFORM, OPTICAL FIBRE - A method for manufacturing a primary preform for an optical fibre wherein conditions are created in the reaction zone such that one or more glass layer packages made up of at least two separate glass layers are deposited on the interior of the substrate tube. | 03-21-2013 |
20130067961 | METHOD FOR MANUFACTURING A PRIMARY PREFORM FOR OPTICAL FIBRES, PRIMARY PREFORM, FINAL PREFORM AND OPTICAL FIBRE - A method for manufacturing a primary preform for an optical fibre wherein conditions are created in the reaction zone such that one or more glass layer packages made up of at least two separate glass layers are deposited on the interior of the substrate tube. A method for manufacturing a final preform as well as primary preforms, final preforms and optical fibres obtained therewith. | 03-21-2013 |
20130319052 | METHOD AND APPARATUS FOR CLEAVING AND CHAMFERING OPTICAL FIBER - A process and apparatus for cleaving an optical fiber are provided. The process includes window stripping the optical fiber using a laser source to create a window strip. The window stripped optical fiber is then scribed at a position within the window strip and tension is applied to the optical fiber. The cleaved optical fiber can be chamfered by applying a heat source to the cleaved end face. The above process and apparatus provide a high precision and inexpensive system for fiber cleaving and chamfering. | 12-05-2013 |
20140157829 | METHOD FOR ACTIVATING AN INNER SURFACE OF A HOLLOW GLASS SUBSTRATE TUBE FOR THE MANUFACTURING OF AN OPTICAL FIBER PREFORM - A method for activating an inner surface of a hollow glass substrate tube for manufacturing an optical fiber preform including depositing a plurality of activation glass layers on the inner surface of the hollow substrate tube by a PCVD process, wherein a total thickness of the deposited activation glass layers is between 10 microns and 250 microns, and etching the deposited activation glass layers to remove at least 30% of the deposited activation glass layers. | 06-12-2014 |
20140208802 | 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). | 07-31-2014 |
20150040615 | PARTIAL VACUUM OPERATION OF ARC DISCHARGE FOR CONTROLLED HEATING - An electrical discharge, suitable for heating optical fibers for processing, is made in a controlled partial vacuum, such that saturation of available ionizable gas molecules is reached. The workpiece temperature is thereby made to be a stably controlled function of the absolute air pressure and is insensitive to other conditions. A system and method accomplishing the foregoing are provided. | 02-12-2015 |
20150315060 | METHOD FOR MANUFACTURING A PRECURSOR FOR A PRIMARY PREFORM FOR OPTICAL FIBRES BY A PLASMA DEPOSITION PROCESS - A method for manufacturing a precursor for a primary preform for optical fibres by an internal plasma deposition process including the steps of providing a hollow substrate tube, creating a first plasma reaction zone having first reaction conditions and depositing non-vitrified silica layers along at least a portion of the inner surface of the substrate tube, subsequently creating a second plasma reaction zone having second reaction conditions different from the first reaction conditions and depositing vitrified silica layers along at least a portion of the substrate tube, and cooling the substrate tube to produce the precursor for a primary preform. | 11-05-2015 |