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| Number | Title | Issue Date |
| 7404302 | Method of depositing glass soot A method for deposition glass soot for making an optical fiber preform. A fuel and a glass precursor are flowed to a burner flame forming glass soot which is deposited onto a glass target. By first depositing an insulating layer of glass soot with a low velocity bur... | 07/29/2008 |
| 7387000 | Method of producing a hollow glass cylinder with suspension during sintering The invention relates to a method for producing a silica glass tube which is characterized by depositing SiO2 particles on an elongate support that rotates about its longitudinal axis, thereby producing a porous with a cylindrical inner bore. Said blank i... | 06/17/2008 |
| 7089766 | Method of forming optical fiber preforms Methods, apparatus and precursors for producing substantially water-free silica soot, preforms and glass. The methods and apparatus make substantially water-free fused silica preforms or glass by removing water as a reaction product, removing water from the atmosphe... | 08/15/2006 |
| 7089765 | Method of making a jacketed preform for optical fibers using OVD On the basis of a known process for the production of a preform for an optical fiber for optical data transmission technology, the productivity of the process for the production of complex refractive index profiles is to be improved by providing a quartz glass subst... | 08/15/2006 |
| 7021083 | Manufacture of high purity glass tubes A glass tube for use in an optical fiber preform is produced by applying a first soot on an end face of a starting member to form an elongated, porous cylindrical soot core having a first density, and applying a second soot including SiO2 on the periphery... | 04/04/2006 |
| 7010203 | Optical fiber manufacturing method and optical fiber An object of the present invention is to provide an optical fiber manufacturing method and an optical fiber in which an increase in the transmission loss is suppressed by preventing hydroxyl group from entering near the core portion. This invention provides a... | 03/07/2006 |
| 6915665 | Method of inducing transmission in optical lithography preforms The invention provides an ultraviolet lithography method/system. The lithography method and system include providing a below 200 nm radiation source, providing a photolytically improved transmitting fused silica glass lithography optical element, transmitting below ... | 07/12/2005 |
| 6895783 | Method of producing optical fiber preform A plurality of glass particles synthesizing burners are arranged at a predetermined burner interval opposite to a rotating starting rod. The starting rod and the glass particles synthesizing burners are relatively parallely reciprocally moved, and the soot depositio... | 05/24/2005 |
| 6851281 | Method of fabricating rare earth doped optical fibre The present invention provides a method of fabricating rare earth doped preforms and optical fibers by a combination of modified chemical vapor deposition (MCVD) process and solution doping technique said MCVD process is used to develop matched or depressed clad str... | 02/08/2005 |
| 6845636 | Apparatus for dehydrating and consolidating an optical fiber preform and method of the same A dehydration and consolidation furnace and a dehydration and consolidation method in which gas in a chamber does not leak to a furnace body room and gas in a furnace body room does not leak into a chamber is provided. A furnace of one embodiment of this invention h... | 01/25/2005 |
| 6843076 | Single step laydown method of making dry fiber with complex fluorine doped profile A method of making an optical waveguide preform includes forming a preform including a first portion and a second radial portion, wherein the second portion includes a dopant, and wherein the first portion exhibits a density greater than the second portion. The meth... | 01/18/2005 |
| 6802191 | Controlled collapse of depressed index optical fiber preforms The doped silica core region of a core rod for an optical fiber preform is protected against unwanted fluorine doping during fluorine doping of the outer silica layer by selectively consolidating the core region prior to fluorine doping. Due to dopants in the core r... | 10/12/2004 |
| 6779364 | Cladding-pumped optical fiber and methods for fabricating Disclosed is an optical fiber article for receiving pump radiation of a first wavelength for amplifying or generating radiation of a second wavelength. The optical fiber article includes a core for propagating light of the second wavelength. The core has a first ind... | 08/24/2004 |
| 6776012 | Method of making an optical fiber using preform dehydration in an environment of chlorine-containing gas, fluorine-containing gases and carbon monoxide Embodiments of the invention include a method for making optical fiber having reduced aging or hydrogen aging loss over the life of the fiber and optical fiber systems including such optical fibers. The method includes the steps of dehydrating an optical fiber glass... | 08/17/2004 |
| 6732549 | Multi-pass sintering of a sol-gel body through a hot zone A process produces a glass overcladding tube from a silica gel body. The process includes passing the gel body through a hot zone under conditions that cause partial sintering of the gel body and repassing the gel body through the hot zone under conditions that furt... | 05/11/2004 |
| 6588229 | Method for controlling heat treatment in process of fabricating high purity silica glass Disclosed is a method for controlling a heat treatment in the process of fabricating a high purity silica glass via a sol-gel process using a low temperature heater having an inhalation line and an exhaust line. Accordingly, the method includes the steps ... | 07/08/2003 |
| 6550280 | Process of sintering a hanging silica tube so as to exhibit a low bow The invention involves fabricating a ceramic tube, e.g., a silica overcladding tube, with very little bow, e.g., about 0.3 mm per meter or less. In particular, the invention involves securing the tube by a handle that both allows the tube to hang plumb du... | 04/22/2003 |
| 6550277 | Quartz glass body for optical component and process for manufacture thereof The invention concerns a quartz glass body for an optical component for the transmission of UV radiation with a wavelength of 250 nm and less, especially for a wavelength of 157 nm, as well as a process for the manufacture of the quartz glass body where f... | 04/22/2003 |
| 6536240 | Method of making an optical fiber preform via multiple plasma depositing and sintering steps A method for producing an optical fiber preform starting with a first-generation target typically comprising pure silica. A plasma torch deposits an annular region of doped silica to form an intermediate structure. The intermediate structure is drawn down... | 03/25/2003 |
| 6532767 | Methods for producing fused silica glass Methods for producing high purity fused silica (HPFS) glass having desired levels of dissolved hydrogen are provided. The methods involve measuring the level of hydrogen in the cavity of the furnace used to produce the glass and controlling the pressure w... | 03/18/2003 |
| 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 |
| 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 |
| 6474107 | Fluorinating an optical fiber preform in a pure aluminum oxide muffle tube A method for fabricating fluorine doped, silica based glass and fiber by depositing a layer of high purity silica soot on a core rod while rotating the core rod places the rod of pure fused silica or doped fused silica and silica soot in a furnace having ... | 11/05/2002 |
| 6438999 | Decreased H2 sensitivity in optical fiber Disclosed is a method of making a hydrogen resistant optical waveguide fiber. The soot preform is heated and then immersed in a GeCl4 gas. A reduced metal species is thus incorporated into the glass soot prior to sintering or consolidation of the soot pre... | 08/27/2002 |
| 6381987 | Process for making opaque quartz glass and opaque component made according to the process Based on a known process for the manufacture of opaque quartz glass, by mixing SiO2 particles and an additive which is volatile at a melting temperature, forming a body and melting said body with an advancing melt front forming in the body, it ... | 05/07/2002 |
| 6374641 | Method of making an optical fiber by melting particulate glass in a glass cladding tube An optical article having a rare earth doped, fluorinated aluminosilicate glass core composition consisting essentially, in mole %, of: SiO2 0-90 GeO2 0-90 ... | 04/23/2002 |
| 6289698 | Method of making a fiber preform with increases in alumina concentration at radial distances A sintered dense glass, alumina-doped optical fiber preform is stretched and is then heated to a temperature of 1490-1495° C. to remove bubbles without causing crystallization. Thereafter, the stretched glass body is either drawn directly into an optical... | 09/18/2001 |
| 6260388 | Method of fabricating photonic glass structures by extruding, sintering and drawing Disclosed is a method of making a photonic crystal using a combination of extruding and drawing techniques. The method is contemplated as being capable of producing both two and three dimensional crystals due to the maturity and diversity of extruding and... | 07/17/2001 |
| 6189340 | Process for forming a titania-containing preform silica glass blank Disclosed is an optical waveguide fiber having a compressive outer layer that includes TiO2 in the SiO2 matrix glass. The compressive outer layer includes crystalline structures containing TiO2 that are predominately rutil... | 02/20/2001 |
| 6128430 | Composition for optical waveguide article and method for making continuous clad filament An optical article having a rare earth doped, fluorinated aluminosilicate glass core composition consisting essentially, in mole %, of: ______________________________________ SiO2 0-90 GeO2 0-90 ... | 10/03/2000 |
| 6116055 | Method of making synthetic silica glass Disclosed is a synthetic silica-glass fabricating method in which the doping of chlorine into silica glass made by using a flame hydrolysis or thermal oxidation is increased. The process comprises the steps of producing a porous deposit of silica-glass pa... | 09/12/2000 |
| 6062046 | Method of making a single-mode optical fiber with multiple concentric core portions including the RIT process 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... | 05/16/2000 |
| 5837024 | Process for the production of quartz glass bodies An essentially cylindrical porous blank is formed by the deposition of SiO2 particles onto the lateral cylindrical surface of a cylindrical mandrel, rotating around its longitudinal axis; this blank is provided with a holding element of quartz ... | 11/17/1998 |
| 5802235 | Dispersion compensating fiber and its manufacturing method A dispersion compensating fiber is provided which is capable of reducing the birefringence of the core caused in spinning to suppress an increase in polarization mode dispersion due to the birefringence of the core even though the surface of the core rod ... | 09/01/1998 |
| 5769921 | Method of producing quartz glass body A solid or hollow cylindrical heat-resistant substrate having a tapered shape is rotated about its axis, the degree of tapering being essentially constant along the entire length. The substrate has an outer diameter in the range of 20 mm to 500 mm and a l... | 06/23/1998 |
| 5735921 | Method of reducing laser-induced optical damage in silica The invention relates to the production of high purity fused silica glass which is highly resistant to 248 nm excimer laser-induced optical damage. In particular, this invention relates to a fused silica optical member or blank.... | 04/07/1998 |
| 5713979 | Heat treatment facility for synthetic vitreous silica bodies An induction-heated furnace, suitable for heat treatment of synthetic silica bodies, under conditions of high purity, includes a tubular susceptor (1) disposed with its axis vertical and an induction coil (3) for raising the temperature of the susceptor. ... | 02/03/1998 |
| 5693116 | Process for producing optical waveguide This process for producing an optical waveguide comprises a step of sintering a glass fine-particle layer to form a upper cladding layer, and a step of controlling a refractive index of the upper cladding layer by changing a temperature decreasing rate wh... | 12/02/1997 |
| 5693115 | Process for production of glass preform for optical fiber including consolidating in a furnace with a temperature gradient In order to provide an improved process for the production of a glass preform for an optical fiber which includes substantially no bubble formation therein and also has a substantially uniform shape, the present invention provides a process for the produc... | 12/02/1997 |
| 5665132 | Process for the sintering of hollow cylinders of silicon dioxide soot A hollow cylinder is held in a vertical orientation and sent continuously through a heating zone for sintering. In a first phase of the sintering operation, the hollow cylinder stands on a support while the upper end (12) of the cylinder is being sintered... | 09/09/1997 |
