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| Number | Title | Issue Date |
| 7343075 | Optical fibers with improved resistance to ingressing molecules An optical fiber includes a glass fiber having a glass core and a cladding that contains voids that are spaced apart from the core, in contact with the core, or form a substantial portion of the core. The voids act as trapping sites for ingressing molecules from the... | 03/11/2008 |
| 7266275 | Nonlinear optical fibre method of its production and use thereof An optical fiber having a longitudinal direction and a cross-section perpendicular thereto, said fiber in a cross-section comprising: (a) a core region (11) having a refractive index profile with a highest refractive index nc, and (b) a cladding re... | 09/04/2007 |
| 7266276 | Optical fibers with improved resistance to ingressing molecules An optical fiber includes a glass fiber having a glass core and a cladding that contains voids that are spaced apart from the core, in contact with the core, or form a substantial portion of the core. The voids act as trapping sites for ingressing molecules from the... | 09/04/2007 |
| 7143611 | Rod-In-Tube optical fiber preform assembly and method having reduced movement Embodiments of the invention include an optical fiber preform assembly and a method for making optical fiber using the preform assembly. The assembly includes a preform core rod, at least one overclad tube formed around the preform core rod, a handle attached to one... | 12/05/2006 |
| 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 |
| 7062942 | Method of manufacturing glass optical fibre preforms and optical fibres A method of making an optical fibre including providing an increased diameter portion on a rod. The rod is assembled by positioning the rod in a tube such that an annular gap is defined between an outer surface of the rod and an inner surface of the tube, and such t... | 06/20/2006 |
| 7043128 | Multimode optical fibers with increased bandwidth The specification describes a technique for drawing circular core multimode optical fiber using twist during draw to increase fiber bandwidth. ... | 05/09/2006 |
| 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 |
| 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 |
| 6993228 | Dispersion compensated optical fiber transmission system and module including micro-structured optical fiber Disclosed is an optical transmission system and module which includes a negative dispersion, dispersion compensating optical fiber coupled to a micro-structured optical fiber (such as band gap fiber, photonic crystal fiber or holey fiber) for compensating for the ac... | 01/31/2006 |
| 6987917 | Optical fiber preform producing method, optical fiber preform, and optical fiber An object of the present invention is to provide a method for manufacturing an optical fiber preform having a great diameter by reducing an eccentricity or a non-circularity of a core, an optical fiber preform having an small non-circularity and a complex refractive... | 01/17/2006 |
| 6967714 | Method for determining a refractive index The matter for which the refractive index is to be determined, is made available in the form of a theoretically determinable scattering or diffraction pattern. Two or more orders of diffraction may then be defined to form at least one intensity ratio. At least one i... | 11/22/2005 |
| 6968107 | Holey optical fibres An optical fiber structure having a holey fiber arranged in a holey outer support structure made up of holey tubes encased in a thin walled outer jacket. The holey fiber may have a solid core surrounded by a holey cladding having a plurality of rings of holes. With ... | 11/22/2005 |
| 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 |
| 6917741 | Methods for manufacturing microstructured optical fibers with arbitrary core size The present invention provides methods for manufacturing microstructured optical fibers having an arbitrary core size and shape. According to one embodiment of the invention, a method of fabricating a photonic band gap fiber includes the steps of forming an assembly... | 07/12/2005 |
| 6892018 | Micro-structured optical fiber A microstructured fiber having a cladding comprising a number of elongated features that are arranged to provide concentric circular or polygonial regions surrounding the fiber core. The cladding comprises a plurality of concentric cladding regions, at least some of... | 05/10/2005 |
| 6883351 | Method for fabricating a low polarization mode dispersion optical fiber The method of fabricating an optical waveguide fiber from a preform having a centerline aperture which includes reducing the pressure in the centerline aperture, then increasing the pressure in the centerline aperture to a pressure in order to improve uniformity, ci... | 04/26/2005 |
| 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 |
| 6848277 | Projection lithography photomasks and method of making The present invention is a method of making a lithography photomask and photomask blank. The method of making the lithography photomask and photomask blank includes providing a silicon oxyfluoride glass tube having an OH content less than 50 ppm. The method further ... | 02/01/2005 |
| 6847771 | Microstructured optical fibers and preforms and methods for fabricating microstructured optical fibers A microstructured optical fiber is described. The microstructured optical fiber comprises an inner region and an outer region. The inner region includes an inner material and a plurality of holes formed in the inner material. The outer region surrounds the inner reg... | 01/25/2005 |
| 6836605 | Optical fiber preform, production method thereof, and optical fiber produced from the preform An optical fiber preform having a low core noncircularity and eccentricity for producing an optical fiber having an improved polarization mode dispersion, a method for producing the preform, and an optical fiber produced from the preform. The optical fiber preform i... | 12/28/2004 |
| 6821449 | Two step etching process for an optical fiber preform This invention relates to a method of preparing an optical fiber preform with the preform having a uniform refractive index profile for the deposited oxide material that ultimately forms the optical fiber core. One embodiment of the invention relates to a process fo... | 11/23/2004 |
| 6775450 | Micro-structured optical fibers A micro-structured optical fiber precursor 1 is made by size reducing a multiple core optical fiber having solid multiple cores or a multiple core optical fiber preform O having multiple solid core preforms C. A fiber fuse is induced in at least one of the co... | 08/10/2004 |
| 6754425 | Dispersion flattened fiber with high negative dispersion and method for the manufacture thereof The invention relates to a dispersion flattened fiber (DFF) with high negative dispersion and a manufacturing method thereof. The dispersion flattened fiber comprises a central core; ring-type cores and low refractive regions alternately formed outside the central c... | 06/22/2004 |
| 6738550 | Holey waveguide manufacture A method of forming a holey waveguide, the method comprising the steps of forming a guiding region of a preform, forming a cladding region of the preform, wherein at least a portion of the cladding region of the preform is formed from a plurality of cladding tubes o... | 05/18/2004 |
| 6718800 | Method of collapsing a tube for an optical fiber preform The present invention provides a method of preparing preforms for optical fibers. The invention allows one to remove or significantly reduce undesirable refractive index variations in the central portion of the optical fibers. The method of preparing the preform hav... | 04/13/2004 |
| 6587633 | Active optical fibre doped with rare earth elements An active optical fiber (20) having: a silica glass cladding (4), and a glass core (2), doped with a rare earth, comprising a quantity of SiO2 of at least 50% in weight, and a quantity of an oxide XO not exceeding 40% in weight, wherein the element ... | 07/01/2003 |
| 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 |
| 6523368 | Dispersion-managed fiber preform and fabricating method thereof by MCVD There is provided a dispersion-managed fiber preform and a fabricating method thereof preform by modified chemical vapor deposition (MCVD). A core and a clad having the refractive index distribution of an optical fiber with a positive dispersion value are... | 02/25/2003 |
| 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 |
| 6519974 | Method for fabricating an optical fiber by simultaneous preform fusing and fiber drawing Disclosed is an apparatus for fabricating an optical fiber, which comprises a furnace for melting a sealed preform assembly to draw an uncoated optical fiber, a coater for coating the uncoated optical fiber, a capstan for drawing the optical fiber from th... | 02/18/2003 |
| 6519388 | Tube-encased fiber grating A tube-encased fiber grating includes an optical fiber 10 having at least one Bragg grating 12 impressed therein which is embedded within a glass capillary tube 20. Light 14 is incident on the grating 12 and light 16 is reflected at a reflection wavelengt... | 02/11/2003 |
| 6510711 | Apparatus and method for sintering a sol-gel tube using a furnace having a rotating cap Disclosed is an apparatus and method for sintering an over-jacketing tube in the zone sintering phase of an optical fiber preform fabrication process using a sol-gel process. The sintering apparatus includes: a processing tube; a gel tube assembly connect... | 01/28/2003 |
| 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 |
| 6405566 | Method and device for over-cladding an optical fiber primary preform A method and device for providing an optical fiber secondary preform by collapsing an over-cladding tube on an optical fiber primary preform is disclosed in the present invention. The device for over cladding the optical fiber primary preform includes a h... | 06/18/2002 |
| 6173588 | Method of making dispersion managed optical fibers An optical fiber having optical characteristics that vary along its length is made by assembling a plurality of cylindrical glass or soot tablets into or along a glass tablet alignment device, then fused into monolithic assembly. If desired, additional gl... | 01/16/2001 |
| 6053013 | Apparatus and method for overcladding optical fiber preform rod and optical fiber drawing method There are provided an optical fiber rod overcladding apparatus and method, and an optical fiber drawing method. In the preform rod overcladding method, a preform rod is clamped in a top chuck and leveled, and a glass tube is mounted in a bottom chuck and ... | 04/25/2000 |
| 5917109 | Method of making optical fiber having depressed index core region Disclosed is a method of making an optical fiber preform having at least one annular region of depressed refractive index. A tube of silica doped with fluorine and/or boron is overclad with silica soot. A core rod is inserted into the overclad tube and th... | 06/29/1999 |
| 5868815 | Method of making an optical fiber by blowing on a preform tube to enhance collapse The specification describes a process and apparatus for monitoring and controlling the ellipticity of preform tubes during Modified Chemical Vapor Deposition. In response to computer generated signals from the monitoring device, the tube collapse rate is ... | 02/09/1999 |
| 5802236 | Article comprising a micro-structured optical fiber, and method of making such fiber Disclosed are non-periodic microstructured optical fibers that guide radiation by index guiding. By appropriate choice of core region and cladding region, the effective refractive index difference Ɗ between core region and cladding can be made large, typ... | 09/01/1998 |
