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| Number | Title | Issue Date |
| 7088900 | Alkali and fluorine doped optical fiber Disclosed is an optical fiber having a core of SiO2 doped with fluorine and an alkali metal oxide dopant. The alkali metal oxide is selected from the group consisting of K, Na, Li, Cs and Rb and is provided in amount of at least 20 ppm wt. %. The fiber ha... | 08/08/2006 |
| 6993937 | Preform inlet arrangement for an optical fiber drawing furnace, a furnace provided with that kind of inlet arrangement, and a preform equipped to co-operate with that inlet arrangement An inlet arrangement for inserting a preform (3′) into a furnace (1′) for drawing a fiber (2′). The furnace includes an enclosure (4′) at the top of which there are both an opening to allow insertion of a preform which moves in tr... | 02/07/2006 |
| 6973955 | Heated trough for molten metal A trough is described for carrying molten metal, comprising an outer shell defined by a bottom wall and two side walls, an insulating layer filling the outer shell and a conductive U-shaped refractory trough body for carrying molten metal, the trough body being embe... | 12/13/2005 |
| 6945079 | Optical fiber drawing system for non-contact control of polarization mode dispersion of optical fiber Disclosed is a system for drawing an optical fiber for controlling polarization mode dispersion. A furnace is provided for uniformly heating an optical fiber preform in the drawing system mounted to an optical fiber draw tower. The furnace comprises: (a) a main body... | 09/20/2005 |
| 6941774 | Optical fiber preform-heating furnace The present invention provides an optical fiber preform-heating furnace that is simple in its structure and excellent in uniformity of the temperature distribution in a circumferential direction of an optical fiber preform. The optical fiber preform-heating furnace ... | 09/13/2005 |
| 6907757 | Drawing method of optical fiber and drawing furnace The drawing method of the present invention uses a drawing furnace comprising a furnace muffle tube, a furnace body and a heater. According to the method, an optical fiber preform is inserted from the inlet of the furnace muffle tube, the optical fiber preform is me... | 06/21/2005 |
| 6735983 | Optical fiber drawing method and drawing furnace A fiber drawing method according to the present invention is a drawing method of optical fiber for drawing an optical fiber 14 from one end of a fiber preform 13 by softening with heat, wherein the fiber preform 13 is set in a semi-closed space ... | 05/18/2004 |
| 6668592 | Optical fiber drawing furnace having adjustable partitions A furnace for drawing an optical fiber provided with a muffle tube (10) and inner tubes (5,5') connected to the upper end of the core tube, wherein a preform (1) supported by a dummy rod (2) at the upper part thereof is disposed inside the muffle tube (10... | 12/30/2003 |
| 6640589 | Glass base material drawing apparatus and method for drawing glass base material The glass base material drawing apparatus for heating and drawing a glass base material has a storage unit for storing the glass base material having an opening unit that is opened along the longitudinal direction of the storage unit when the glass base m... | 11/04/2003 |
| 6546760 | Optical fiber drawing furnace with a zig zag heating element There is provided an optical fiber drawing furnace capable of drawing an optical fiber having small non circularity, which drawing furnace includes a muffle tube, in which an optical fiber preform is supplied, a heater surrounding the muffle tube, a plura... | 04/15/2003 |
| 6519977 | Optical fiber preform suspending and supporting apparatus and optical fiber preform processing apparatus An optical fiber preform suspending and supporting apparatus able to prevent deformation of a pin placed in a high temperature environment and able to support a porous optical fiber preform without adversely influencing supports of the pin and without cau... | 02/18/2003 |
| 6474109 | Device and method for drawing optical fibers from a preform The invention relates to a device for drawing optical fibers from a preform, comprising: a furnace comprising a tube for heating one end of said preform to the drawing temperature thereof, which tube comprises: i) a central tube, ii) an upper extension tube co... | 11/05/2002 |
| 6314767 | Apparatus for manufacturing an optical fiber preform and including a ring for trapping and diffusing light radiation An apparatus and method for manufacturing an optical fiber preform from a tube of vitreous material. A holding device holds the tube during manufacture of the preform and a heater supplies the necessary heat energy for preform manufacturing. A diffuser is... | 11/13/2001 |
| 6295844 | Apparatus and method for drawing glass fibers An apparatus and method for drawing low loss fluoride glass fibers from a preform. A stream of reactive gas is passed around the preform and fiber so as to prevent moisture and oxygen contamination of the fiber while the fiber is being drawn. The apparatu... | 10/02/2001 |
| 6257023 | Fiber optic draw furnace having a heating element and a furnace shell, featuring rigidified high purity graphite felt insulation therebetween The present invention provides an improvement to a fiber optic draw furnace having a heating element (22) arranged inside a furnace shell (20) for drawing an optical fiber (F) from a preform (P). The fiber optic draw furnace (10) has one or more pieces of... | 07/10/2001 |
| 6192715 | Furnace for forming optical fiber An optical fiber drawing furnace capable of the prevention of entry of an ambient gas into an inner space thereof both effectively and economically, provided with a lower gas introduction portion through which inert gas is introduced into the inner space ... | 02/27/2001 |
| 6138481 | Glassrod elongation heating furnance having double bellows In a heating furnace which holds at least one end of a glass rod with a holding portion and elongates the glass rod by softening the glass rod successively from the other end portion thereof with heating while applying a tensile force thereto, the heating... | 10/31/2000 |
| 6055830 | Optical fiber spinning apparatus and method A furnace minimizes the lowering of the quality of optical fibers, especially those lowerings of the quality that stems from variations of the conditions inside of the furnace. These variations can occur when a preform is connected to an auxiliary quartz ... | 05/02/2000 |
| 5942019 | Elongating apparatus and method for glass preform and furnace body for elongating apparatus A furnace body for a glass preform elongating apparatus which makes an elongated body by passing the glass preform through the furnace body and elongating the glass preform while heating the glass preform, the furnace body comprising a furnace core tube s... | 08/24/1999 |
| 5931984 | Device for drawing down an optical fiber preform A device for drawing down an optical fiber preform (2) connected at one end to a feed rod (3) having an equal or smaller diameter. A chamber (11) in which the preform is drawn has an upper part (11A) with an opening (12). The opening engages the preform t... | 08/03/1999 |
| 5545246 | Method and device for manufacturing an optical fiber A method for manufacturing an optical fiber (11), wherein the fiber (11) is drawn from one end of a preform (9) which is heated to above the glass softening temperature. The preform (9) is surronded by a protective gas (14) whose flow direction correspond... | 08/13/1996 |
| 5320660 | Method of manufacturing an optical fibre An optical fibre is manufactured by stretching a rod-shaped initial preform, after which a cladding tube is melted on the initial preform and the final preform thus obtained is drawn into an optical fibre. A narrow and hot softening zone is used to stretc... | 06/14/1994 |
| 5284499 | Method and apparatus for drawing optical fibers A method and apparatus for drawing an optical waveguide fiber which minimizes fiber bow caused by differential stresses in the cladding layer of the fiber are disclosed. The fiber is drawn from a preform which is heated in a draw furnace. Gases introduced... | 02/08/1994 |
| 5100449 | Method of forming glass articles Disclosed is a method and apparatus for drawing an elongated glass article such as a fiber optic device. The article is drawn upwardly from a source through the surface of a quantity of molten metal having a vertical temperature gradient. The source can b... | 03/31/1992 |
| 4906268 | Heating oven for preparing optical waveguide fibers A method for consolidating a porous glass preform is provided in which a preform is placed in a stationary elongated chamber and selected portions of the chamber, distributed along the chamber's length, are sequentially heated above the preform's sinterin... | 03/06/1990 |
| 4894078 | Method and apparatus for producing optical fiber In a method for producing an optical fiber having a resin coating, an optical fiber which is drawn from a preform for an optical fiber heated and melt by a heating source can be effectively cooled before it is coated with a resin by cooling the drawn fibe... | 01/16/1990 |
| 4867775 | Method and apparatus for coating optical fibers A method and apparatus for the rapid on-line coating of optical fibers with two-package polymer coating systems utilizing conventional liquid fiber coaters is described. The A and B parts of the two-package coating system are continuously combined and mix... | 09/19/1989 |
| 4714488 | Apparatus for producing an optical fiber preform A porous glass optical waveguide preform is formed by depositing a coating of glass particulate material on the lateral surface of a core which may be a porous glass body continuously produced by the axial deposition of glass particles. The core rotates a... | 12/22/1987 |
| 4702759 | Apparatus for reducing volume and surface defects in silica optical-fibres The method allows surface defect reduction in silica optical-fibres by enriching the external layer by silica bonded carbon atoms within the silica network: SiC.SiO2. Carbon is obtained from chemical reaction directly during the drawing step. V... | 10/27/1987 |
| 4673427 | Method of and device for drawing an optical fiber from a solid preform consisting substantially of SiO2 and doped SiO2 Optical fibres are drawn from a solid preform which consists substantially of SiO2 and doped SiO2. After leaving the heating zone, the fiber is guided through a space having a laminar gas flow to restrict the temperature drop across ... | 06/16/1987 |
| 4631079 | Method for stretching a glass rod Control over the diameter variations in a glass rod (10) during the stretching thereof is accomplished by cooling the rod after heating and initial neck down of a portion (22) thereof. After cooling, the rod (10) is reheated, at a lower temperature suffic... | 12/23/1986 |
| 4578098 | Apparatus for controlling lightguide fiber tension during drawing A lightguide furnace (10) includes a tube (32) at its base. The tube (32) has at least one opening (34) therethrough, in communication with, but substantially misaligned relative to, a corresponding opening (40) through a sleeve (36) coaxially aligned wit... | 03/25/1986 |
| 4575463 | Method of applying hermetic coating on optical fiber An optical fiber which has just been drawn from an optical preform is provided with two external hermetic coatings. The primary coating is a metallic or dielectric coating provided by, for example, using a heterogeneous nucleation thermochemical depositio... | 03/11/1986 |
| 4557742 | Polarized optical fiber and method of forming same A polarized optical fiber, having inherent birefringence provided by electrically induced orientation of its microcrystalline structure provides fixed polarization. In the method, an optical fiber having inherent birefringent characteristics is formed by ... | 12/10/1985 |
| 4547644 | Apparatus for heating a preform from which lightguide fiber is drawn An induction furnace (60) for reflowing a portion of an optical preform (12) in order to draw a lightguide fiber (11) therefrom includes a tubular susceptor (80) which is disposed centrally within a beaker (75) and a sleeve (82) which is disposed concentr... | 10/15/1985 |
| 4514205 | Fiber cooling apparatus Disclosed is an optical waveguide fiber coating system having means for cooling the hot fiber prior to the time that the fiber enters the coating apparatus. The cooling means comprises an elongated coolant tube through which the fiber passes. Cool dry hel... | 04/30/1985 |
| 4477274 | Device for drawing an optical fibre An improved sealing of the inlet channel of a drawing furnace for optical fibres can be achieved by using one or more silicon rubber discs having an aperture whose diameter is smaller than that of the preform. Burning of the silicon rubber discs can be checked... | 10/16/1984 |
| 4437870 | Optical waveguide fiber cooler Disclosed is an optical waveguide fiber coating system having means for cooling the hot fiber prior to the time that the fiber enters the coating apparatus. The cooling means comprises an elongated tube through which the fiber passes. Cool dry helium is f... | 03/20/1984 |
| 4428760 | Oxyhydrogen flame torch for optical fiber drawing An oxyhydrogen torch for use in drawing an optical fiber from a preform without axial rotation includes four coaxial tubular elements bounding respective passages. The fiber is coaxially drawn through the innermost passage, and hydrogen, oxygen and an ine... | 01/31/1984 |
| 4407666 | Methods for prolonging the useful life of a graphite element in an optical fiber-drawing furnace An optical fiber drawing furnace includes a graphite element of generally cylindrical shape with a reduced central cross-sectional configuration having a flange at opposite ends thereof and having an axial hole therethrough including a central internal el... | 10/04/1983 |
