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| Number | Title | Issue Date |
| 7177512 | Solid type polarization maintaining fiber and apparatus Disclosed is an optical fiber (20) having a centermost laterally-elongated core (30) having a short dimension (a), a long dimension (b) and a first refractive index (n1), a moat (40) surrounding the central laterally-elongated core, t... | 02/13/2007 |
| 7159418 | Method of producing synthetic quartz glass Fluorine-containing synthetic quartz glass is produced by feeding silica-forming material, hydrogen, and oxygen gases from a burner to a reaction zone, flame hydrolyzing the silica-forming material in the reaction zone to form particles of silica, depositing the sil... | 01/09/2007 |
| 7159421 | Manufacture of planar waveguides using sol-gel techniques Silica sol techniques are described for making thick silica or silica based films useful for planar optical waveguides. The process involves coating of a colloidal silica sol onto a substrate, drying the sol, and consolidating the dried sol to form the planar wavegu... | 01/09/2007 |
| 7155098 | Method of manufacturing optical fiber preform using modified chemical vapor deposition including dehydration and dechlorination process and optical fiber manufactured by the method Disclosed is a method of manufacturing an optical fiber perform using MCVD including dehydration and dechlorination, which executes the following process repeatedly with changing the composition of soot generation gas according to the refractive index profile, the p... | 12/26/2006 |
| 7133591 | Jacket tube made of synthetically produced quartz glass and optical fibres produced using said jacket tube Jacket tubes of synthetically produced quartz glass as a semi-finished product for producing an outer cladding glass layer of an optical fiber are generally known. The invention relates to an improvement of a jacket tube in terms of inexpensive producibility and of ... | 11/07/2006 |
| 7116888 | Chalcogenide glass for low viscosity extrusion and injection molding The invention is directed to chalcogenide glasses suitable for use in plastics forming processes. The glasses have the general formula YZ, where Y is Ge, As, Sb or a mixture of two or more of the same; Z is S, Se, Te, or a mixture of two or more of the same; and Y a... | 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 |
| 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 |
| 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 |
| 7082243 | Large effective area high SBS threshold optical fiber An optical waveguide fiber having a high threshold for stimulated Brillouin scattering. The optical fiber preferably has large optical effective area, and further preferably has a low zero dispersion wavelength. ... | 07/25/2006 |
| 7016582 | Polarized wave holding optical fiber, and method of producing the same Based on an intermediate 20A in which a cladding portion 22 is formed on the outer periphery of a core portion 21, a pair of holes 23 and 24 are provided parallel to the z axis on both sides of the core portion 21 within the... | 03/21/2006 |
| 7003206 | 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... | 02/21/2006 |
| 6996324 | Optical waveguide and method for fabricating the same An optical waveguide comprising cladding 1 and core segment 20 buried in cladding 1 and serving as a waveguide, wherein a combination of glass material constituting the core segment 20 and another glass material constituting the cladding ... | 02/07/2006 |
| 6970632 | Solid type single polarization fiber and apparatus Disclosed is an optical fiber (20) having a centermost laterally-elongated core (30) having a short dimension (a), a long dimension (b) and a first refractive index (n1), a moat (40) surrounding the central laterally-elongated core, t... | 11/29/2005 |
| 6966201 | High-temperature sintering of soot bodies doped using molecular stuffing Techniques are described for fabricating a preform from a soot body. In one described technique, a soot body is loaded into a substrate tube, and the position of the soot body is stabilized within the tube. The tube is then rotated around its longitudinal axis. Heat... | 11/22/2005 |
| 6948340 | Method of producing an elliptic core optical fiber Disclosed is a method of producing an elliptic core optical fiber, in which a original preform having a circular core disposed at the center of a circular clad is processed to flatten on its periphery to form a processed preform that is then drawn with heating into ... | 09/27/2005 |
| 6935050 | Method and apparatus reducing metal impurities in optical fiber soot preforms A method and apparatus for producing an optical fiber preform including a metal remover, which operates by adsorption, that removes gaseous transition metal impurities present in a process gas to be provided to a furnace for drying, doping or consolidation. The appa... | 08/30/2005 |
| 6928841 | Optical fiber preform manufacture using improved VAD The specification describes a VAD method for producing optical fiber preforms by depositing soot onto a solid core rod. The solid core rod preferably has a uniform composition, doped or undoped, suitable for the center core region of the preform. The primary claddin... | 08/16/2005 |
| 6917740 | Optical fiber having reduced viscosity mismatch An optical fiber is disclosed in which the core region of the optical fiber is doped with Cl and F in order to reduce the viscosity mismatch between the core region and the adjacent cladding region. In one embodiment of the invention, the optical fiber is a single-m... | 07/12/2005 |
| 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 |
| 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 |
| 6698247 | Method and feedstock for making silica by flame combustion A method for making silica includes delivering a silica precursor comprising a perfluorinated group to a conversion site and passing the silica precursor through a conversion flame to produce silica soot.... | 03/02/2004 |
| 6699808 | High-solids SiO2 dispersions, process for producing them, and their use Extremely high solids content silica dispersions are useful for forming green bodies of near net shape as compared to the shape of the bodies after sintering. The green bodies are particularly useful for sintering to form low impurity-containing crucibles... | 03/02/2004 |
| 6603903 | Fabrication of photosensitive strong grating couplers Systems devices and methods in accordance with the invention impart high strength index of refraction patterns to photosensitive optical devices, such as Bragg gratings written in optical fibers. A length of small diameter fiber retaining photosensitivity... | 08/05/2003 |
| 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 |
| 6467313 | Method for controlling dopant profiles The present invention discloses novel methods for fabricating glass articles, particularly optical fiber glass preforms, which may contain alumina, yttrium, lanthanum, erbium, or other rare earth metals as dopants. The glass articles made in accordance wi... | 10/22/2002 |
| 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 |
| 6442977 | Sol-gel process for fabricating germanium-doped silica article A sol-gel process for fabricating bulk, germanium-doped silica bodies useful for a variety of applications, including core rods, substrate tubes, immediate overcladding, pumped fiber lasers, and planar waveguides, is provided. The process involves the ste... | 09/03/2002 |
| 6263706 | Method of controlling fluorine doping in soot preforms A method for controlling the refractive index achieved using a fluorine dopant gas, wherein CF4 is employed as the dopant gas, and the soot preform is doped using the CF4 for a time and temperature sufficient to result in a decrease ... | 07/24/2001 |
| 6128928 | Optical fiber resistant to hydrogen-induced attenuation Improved single-mode optical waveguide fibers having a central core region, surrounded by an inner cladding region through which light at a chosen signal wavelength will propagate to an appreciable degree along with propagation of same in the central core... | 10/10/2000 |
| 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 |
| 5763081 | Glass body for optical fiber method of selecting the same optical fiber and method of making thereof A glass body for optical fiber containing GeO2 --SiO2 glass in a core portion thereof, in which the GeO2 --SiO2 glass has an absorbance at 5.16 eV of at least 1/mm but not higher than 2.5/mm or in which concentr... | 06/09/1998 |
| 5681365 | Radiation resistant optical waveguide fiber A radiation resistant optical waveguide fiber doped with fluorine or drawn with low tension in the fiber. The fluorine doping is substantially constant across the core and a portion of the clad adjacent the core. The concentration of the fluorine is in th... | 10/28/1997 |
| 5482525 | Method of producing elliptic core type polarization-maintaining optical fiber A method of producing an elliptic core type polarization-maintaining optical fiber comprises the steps of providing a glass rod comprising a cladding glass layer around the periphery of a core glass layer, the cladding glass layer having a softening point... | 01/09/1996 |
| 5429653 | Method of partially introverting a multiple layer tube to form an optical fiber preform Starting from a process for producing a rod-like preform, in particular for optical fibers, in which a tubular blank whose refractive index changes, viewed in the radial direction is fed to a heating zone, is softened there, and in the softened state is s... | 07/04/1995 |
| 5210816 | Optical fiber and process of producing same In the optical fiber, the concentration of fluorine doped in the core portion is made nonuniform in the radial direction to be greater at the center portion of the core portion and less at the outer circumferential portion of the core portion. As a result... | 05/11/1993 |
| 5203898 | Method of making fluorine/boron doped silica tubes Disclosed is a method of forming a glass tube doped with boron and fluorine. A B2 O3 -doped tubular porous preform is heated, and a fluorine-containing gas is flowed into its aperture. The temperature is sufficiently high to cause th... | 04/20/1993 |
| 5203899 | Method for producing glass preform for optical fiber A glass preform which is used for fabricating an optical fiber, has substantially no bubbles therein and contains sufficient amount of fluorine is produced by a method comprising steps of: forming a porous glass soot body from a glass-forming raw material... | 04/20/1993 |
| 5158587 | Method for producing glass preform for optical fiber A method for producing a glass preform for use in the fabrication of an optical fiber, which includes the steps of forming a glass soot preform from a glass-forming raw material and heating the soot preform in an atmosphere containing SiF4 unde... | 10/27/1992 |
| 5145507 | Method for producing glass preform for optical fiber A glass preform is produced by forming a glass soot composite body having a core portion consisting of a solid glass and a peripheral portion consisting of a porous glass mass, removing trapped gas and water from pores of the soot composite body by heatin... | 09/08/1992 |
