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| Number | Title | Issue Date |
| 7406235 | Graded-index multimode fiber and manufacturing method therefor A graded-index multimode fiber includes a core made of silica glass, the core having a central region and an outer peripheral region, and a cladding which is provided at an outer periphery of the core. The central region contains one of germanium and phosphorus, and... | 07/29/2008 |
| 7279720 | Large bumps for optical flip chips The invention provides bumps between a die and a substrate with a height greater than or equal to a height of a waveguide between the die and the substrate. The bumps may be formed on a die prior to that die being singulated from a wafer. ... | 10/09/2007 |
| 7116877 | Method of manufacturing an optical fibre suitable for high transmission rates The present invention relates to a method of manufacturing an optical fibre suitable for high transmission rates, which method comprises: i) supplying one or more glass forming precursors, and possibly a dopant, to a quartz substrate tube, ii) forming a plasma in th... | 10/03/2006 |
| 7092611 | Method for manufacturing a bar-shaped preform as well as a method for manufacturing optical fibres from such a bar-shaped preform The present invention relates to a method for manufacturing a bar-shaped preform. The present invention further relates to a method for manufacturing optical fibers using the manufactured bar-shaped preform. ... | 08/15/2006 |
| 7069749 | Method of manufacturing a solid preform The present invention relates to a method of manufacturing a solid preform by moving a heat source parallel to the longitudinal axis of a substrate tube, whose inner surface is coated with one or more doped or undoped glass layers, so as to collapse the substrate tu... | 07/04/2006 |
| 7062941 | Manufacturing method of optical fiber preform A method for manufacturing an optical fiber preform that can produce an optical fiber having desired characteristics over the longer length thereof. A crude preform provided with a core region and a cladding region is prepared (Step S1), and at a plurality of... | 06/20/2006 |
| 7003984 | Hybrid manufacturing process for optical fibers A hybrid method of and apparatus for producing a structure capable of being drawn into an optical fiber. The method includes the steps of conducting vapor-phase reactants into an interior region of a glass tube, conducting aerosol form reactants into the interior of... | 02/28/2006 |
| 6988379 | Method of manufacturing large capacity preforms by MCVD The invention provides a low cost method of manufacturing high capacity preforms by chemical vapor deposition. More particularly, there is described a method of manufacturing an optical fiber preform, which method comprises the steps of providing a substrate tube of... | 01/24/2006 |
| 6938443 | Method for the manufacture of a quartz glass preform for an optical fiber The invention relates to a method for manufacture of a quartz glass preform for an optical fibre consisting of the following steps: preparation of a hollow cylinder made of porous quartz glass which exhibits an inner layer with a doping substance which increases the... | 09/06/2005 |
| 6901775 | Method and apparatus for providing a uniform coating thickness along an axial direction within a substrate tube A method and apparatus for providing a uniform coating thickness along an axial direction within an internal portion of a substrate tube is disclosed. A gas delivery unit is configured to coat the internal portion of the substrate tube. The gas delivery unit include... | 06/07/2005 |
| 6840063 | Optical fiber preform manufacturing method for shrinkage and closing of deposited tube An optical fiber preform manufacturing method whereby a clad layer and core layer are deposited on the inner surface of a preform tube for forming a deposited tube. One end of the deposited tube is shrunk and closed. The deposited tube which has a closed end is arra... | 01/11/2005 |
| 6751990 | Process for making rare earth doped optical fiber The present invention provides an improved process for making rare earth doped preforms and fibers by a combination of MCVD technique and solution doping method, said method comprising developing matched or depressed clad structure inside a silica glass substrate tu... | 06/22/2004 |
| 6718801 | MCVD/PCVD method for making a preform with movement of a furnace The present invention relates to a method for producing a preform, which is substantially free of OH impurities, for an optical fiber, wherein one or more quartz layers, which may or may not be doped, are deposited on the internal surface of a quartz glass support t... | 04/13/2004 |
| 6705123 | Making a photosensitive fiber with collapse of a MCVD tube that is in a small positive pressure atmosphere The present invention includes a method of making a preform for an enhanced photosensitive fiber comprising depositing successive layers of optical material the inside a tube using modified chemical vapor deposition, and collapsing the layers of optical material in ... | 03/16/2004 |
| 6574994 | Method of manufacturing multi-segmented optical fiber and preform A method for manufacturing optical fiber preform and fiber. According to the method, a core cane segment is formed with a refractive index delta preferably between 0.2% and 3% that is most preferably formed by an OVD method. A sleeve is formed including a... | 06/10/2003 |
| 6532774 | Method of providing a high level of rare earth concentrations in glass fiber preforms A method and apparatus are disclosed for the manufacture of an optical fiber preform having incorporated therein a comparatively high concentration of rare earth dopant material, and which thus can be drawn and processed into an optical fiber having low n... | 03/18/2003 |
| 6530244 | Optical fiber preform having OH barrier and fabrication method thereof An optical fiber preform and a fabrication method thereof. In the present invention, an outer OH-barrier and an inner OH-barrier free of P2 O5 are deposited respectively between a substrate tube and a cladding layer and between the c... | 03/11/2003 |
| 6523369 | Method of forming an optical fiber A method and apparatus are disclosed for the manufacture of an optical fiber preform having incorporated therein a comparatively high concentration of rare earth dopant material, and which thus can be drawn and processed into an optical fiber having low n... | 02/25/2003 |
| 6484538 | Method of detecting when an optical preform MCVD tube is completely closed A method of detecting a critical state of closing of a preform during a phase of closing of the preform following a phase of deposition of layers of material that reduce the radial size of an opening formed in the preform smaller in the radial direction c... | 11/26/2002 |
| 6446469 | MCVD method with GE depletion to form a single mode optical fiber The present invention relates to a single-mode optical fiber having a configuration which enables lowering of dispersion slope while securing a sufficient MFD. This single-mode optical fiber has a refractive index profile in which an indent with a suffici... | 09/10/2002 |
| 6418757 | Method of making a glass preform A method of making a glass article such as an optical waveguide preform is disclosed. The method comprises drawing a rod in at least two steps. In the first step an elongated, consolidated preform having an aperture therethrough is drawn to a reduced diam... | 07/16/2002 |
| 6408653 | Apparatus and method for manufacturing optical fiber preform by MCVD An apparatus and a method for manufacturing an optical fiber preform by modified chemical vapor deposition (MDVD). The apparatus includes a heating device for heating a rotating substrate tube while moving in a predetermined direction, wherein the heating... | 06/25/2002 |
| 6220060 | Optical fiber manufacture The specification describes a process and apparatus for collapsing preform tubes in Modified Chemical Vapor Deposition processes. The problem of bubble formation during tube collapse was found to be attributable to excess dopant vapor pressure emitted fro... | 04/24/2001 |
| 6131413 | Method of controlling the etching and collapse of an MCVD tube by monitoring internal pressure In a method of shrinking a tubular optical fiber preform with a doped silica core the preform is placed on a glassmaking lathe to rotate it about an axis, a torch is moved parallel to the axis in front of the preform to shrink it and collapse it in a numb... | 10/17/2000 |
| 6105396 | Method of making a large MCVD single mode fiber preform by varying internal pressure to control preform straightness A large optical preform 303 is made by a modified chemical vapor deposition (MCVD) process by depositing successive layers of core and cladding materials onto the inside surface of a rotating glass tube 33 having a hydroxyl ion (OH-) level that... | 08/22/2000 |
| 5397372 | MCVD method of making a low OH fiber preform with a hydrogen-free heat source A method for making a glass preform substantially free of OH impurities is disclosed. The method comprises the steps of introducing a moving stream of a vapor mixture including at least one compound glass-forming precursor together with an oxidizing mediu... | 03/14/1995 |
| 5318612 | Method for producing optical fiber preforms and device to implement said method According to the invention, a hollow silica bar (2) is produced with a thick wall and high geometrical precision, the bar is then cleaned and an oven (24) is used able to heat the silica to its melting temperature and with respect to which the bar is move... | 06/07/1994 |
| 5242476 | Process for the preparation of glass fiber optical waveguides with increased tensile strength For the production of glass fiber optical waveguides with increased tensile strength, these are drawn from a glass preform with a single-layer or multi-layer of additional sheathing of a glass material, with the material of at least the outermost layer in... | 09/07/1993 |
| 5188648 | Method of manufacturing optical fibres In the PCVD method glass is deposited in layers on the inner wall of a glass tube by heating the tube to a temperature between 1100° and 1300° C., by passing a reactive gas mixture through the glass tube from a gas inlet side at a pressure between 1 and... | 02/23/1993 |
| 5169422 | Methods for heating elongated glass substrate A glass tube (31) from which optical fiber is to be drawn is heated by a torch assembly comprising a plurality of nozzles (54--54) disposed on a carriage. In order to avoid contamination of the tube by particles of the torch assembly resulting from therma... | 12/08/1992 |
| 5160520 | Process for the production of a blank mold for glass fiber optical waveguides To produce a blank mold for glass fiber optical waveguides with a core and a single or multilayer sheath, in which the core glass material is applied to the inner wall of a glass tube by chemical deposition from the vapor phase, the internally-coated glas... | 11/03/1992 |
| 5154745 | Method of fabricating preforms for making optical fibers by drawing A method of fabricating preforms for making optical fibers by drawing, in which a silica deposit, including a doping agent, is formed in successive layers inside a silica-based tube (1) from a chemical vapor containing a gaseous compound of silicon, oxyge... | 10/13/1992 |
| 5145509 | Method of manufacturing optical fibres In the manufacture of optical fibers according to the PCVD method, a method is provided wherein the yield of the method (η), in particular at increased deposition rates (m), is raised by reducing the geometrical taper, without forming optical tapers. Thi... | 09/08/1992 |
| 5123940 | Sol-gel doping of optical fiber preform The method includes collapsing a silica-based glass tube to make a preform and drawing fiber from the preform. Prior to collapsing the tube, one or more glass layers are formed on the inner surface of the tube by dip-coating the surface with a sol compris... | 06/23/1992 |
| 5106402 | Method of manufacturing a monomode optical fiber In the manufacture of preforms for optical fibres, the materials of the core () and of the light-conducting cladding layer (댡) are previously deposited from the gaseous phase. Deposition time is here considerably reduced in that o... | 04/21/1992 |
| 5090979 | Method of manufacturing an optical fiber preform having doped cladding According to the present invention, a preform (7) for an optical fiber is made from a tube having a substrate layer (16) of fluorine-doped silica and a support layer (18) of non-doped silica. A cladding layer (8) of fluorine-doped silica and a core layer ... | 02/25/1992 |
| 5090978 | Methods of collapsing glass tube A preform tube (31) is caused to be collapsed into a preform rod by causing a heat zone (54) provided by a torch assembly (50) to traverse the tube longitudinally in a plurality of passes. During this collapse mode, a muffle tube (100) encloses that porti... | 02/25/1992 |
| 5076824 | Method of making fiber optical preform with pyrolytic coated mandrel A mandrel (12) that is used for supporting a glass soot cylinder during consolidation into anoptical fiber preform is coated by chemical vapor deposition with a material selected from the group consisting of pyrolytic graphite and pyrolytic boron nitride.... | 12/31/1991 |
| 5059230 | Fabrication of doped filament optical fibers Reproducible doped optical fiber preforms having a predetermined dopant concentration level are fabricated by inserting a doped filament into a completed preform prior to consolidation and final collapse so that the filament and dopant materials are centr... | 10/22/1991 |
| 5059231 | Internal coating of a glass tube by plasma pulse-induced chemical vapor deposition For producing a fiberoptic waveguide preforms by plasma pulse-induced chemical vapor deposition (PICVD), blank glass tubes are prepared having a continuously increasing internal diameter in the direction of gas flow. This type of blank compensates for the... | 10/22/1991 |
