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| Number | Title | Issue Date |
| 7458234 | Elongating method of optical fiber base material There is provided an elongating method of an optical fiber base material which can easily correct a distorted portion of an optical fiber base material with it being possible to elongate the optical fiber base material to reduce its diameter. According to such an el... | 12/02/2008 |
| 7444838 | Holey optical fiber with random pattern of holes and method for making same A random array of holes is created in an optical fiber by gas generated during fiber drawing. The gas forms bubbles which are drawn into long, microscopic holes. The gas is created by a gas generating material such as silicon nitride. Silicon nitride oxidizes to pro... | 11/04/2008 |
| 7406243 | Optical fiber array substrate and method for producing the same An optical fiber array substrate 11 has, in one surface thereof, eight V-grooves 12 for securing eight optical fibers 14 aligned in parallel to each other, and V-shaped side grooves 13 formed outside of the respective outermost V-grooves ... | 07/29/2008 |
| 7320232 | Apparatus for fabricating holey optical fiber There is provided an apparatus and method for fabricating a holey optical fiber. An optical fiber with air holes of a predetermined size and shape along the length of the optical fiber is drawn by supplying nitrogen gas into air holes through one end of a holey opti... | 01/22/2008 |
| 7317856 | Method of making optical fiber and optical fiber made by the method Provided is a method of manufacturing an optical fiber preform from which an optical fiber having the desired characteristics can easily be produced. The method comprises the steps of: (1) preparing an intermediate preform for manufacturing an optical fiber preform;... | 01/08/2008 |
| 7302814 | Apparatus for preventing deflection of substrate tube An apparatus for producing an optical fiber preform to perform the deposition process by modified chemical vapor deposition. The Apparatus comprises a main heat source location sensor (800) for detecting the location of a main heat source for heating a substr... | 12/04/2007 |
| 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 |
| 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 |
| 7028508 | Method for producing an optical fiber and optical fiber In the known method for producing an optical fiber, a coaxial arrangement comprising a core rod and an outer jacket tube is elongated, the coaxial arrangement being supplied in a vertical orientation to a heating zone and being softened therein zonewise, starting wi... | 04/18/2006 |
| 7016576 | Method for producing an optical fibre telecommunications cable with reduced polarization mode dispersion An optical cable for telecommunications having an optical core and a plurality of protecting and reinforcing elements or avers placed around the optical core. The optical core has a central reinforcing element, a polymer layer, a plurality of optical fibers incorpor... | 03/21/2006 |
| 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 |
| 7013678 | Method of fabricating graded-index optical fiber lenses A GRIN fiber lens is fabricated by the steps of providing a graded index glass preform, thinning the graded index preform to remove a sufficient thickness of the graded glass to establish a desired Δn, and drawing a graded index optical fiber from the thinned grade... | 03/21/2006 |
| 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 |
| 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 |
| 6988381 | Method of elongating glass preform The present invention provides a method of elongating a glass preform having holes extending in the longitudinal direction while suppressing excess shrinkage of the holes. In the method of elongating a glass preform of the present invention, both ends of the glass p... | 01/24/2006 |
| 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 |
| 6975800 | Fused silica-based optical waveguide and method for its manufacture The invention relates to an optical waveguide (optical fiber) based on quartz glass having reduced internal mechanical stresses. In prior art optical waveguides, the internal mechanical stresses are primarily due to the production process, namely due to the differen... | 12/13/2005 |
| 6952517 | Method for the manufacture of optical fibers, improved optical fibers, and improved raman fiber amplifier communication systems The specification describes an improved optical fiber design in which the criteria for high performance in a Raman amplified optical system, such as moderate effective area, moderate dispersion, low dispersion slope, and selected zero dispersion wavelength, are simu... | 10/04/2005 |
| 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 |
| 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 |
| 6944381 | Optical fiber and evaluation method thereof An optical fiber characterized by a cutoff wavelength of 1310 nm or less, a transmission loss of 0.40 dB/km or less at the wavelength of 1385 nm before hydrogen ageing, a transmission loss of 0.40 dB/km or less in the wavelength range of 1310 nm to 1625 nm after hyd... | 09/13/2005 |
| 6935139 | Method of manufacturing optical fiber The method of manufacturing an optical fiber in accordance with the present invention comprises a step of yielding an optical fiber by drawing an optical fiber preform softened upon heating, wherein a temperature at which the optical fiber preform is softened is at ... | 08/30/2005 |
| 6928840 | Optical fiber producing method A drawing apparatus 1 comprises a drawing furnace 11, a protecting tube 21, and a resin curing unit 31. A buffer chamber 41 is disposed between the drawing furnace 11 and the protecting tube 21, and has a length L1... | 08/16/2005 |
| 6910351 | Method of fabricating an optical fiber with controlled transmission characteristics The invention relates to a method of fabricating an optical fiber with improved control of transmission characteristics. It proposes determining variations in the characteristics of the preform departing from the design characteristics and modifying the diameter of ... | 06/28/2005 |
| 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 |
| 6898359 | High index-contrast fiber waveguides and applications High index-contrast fiber waveguides, materials for forming high index-contrast fiber waveguides, and applications of high index-contrast fiber waveguides are disclosed. ... | 05/24/2005 |
| 6851282 | Apparatus and method for making optical fiber A drawing apparatus 1 has a drawing furnace 11, a heating furnace 21, and a resin curing section 31. The drawing furnace 11 has a muffle tube 13 to which an He gas supply passage 15 from an He gas supply section 14... | 02/08/2005 |
| 6848276 | Optical fiber manufacture method, preform manufacture method, and preform manufacture apparatus A method for manufacturing an optical fiber comprises setting a heating condition for heating a glass rod, which is a parent material of the optical fiber, and an elongating speed of the glass rod based on a prescribed numerical value which changes with a progress o... | 02/01/2005 |
| 6837074 | Method of measuring the twist imparted to an optical fibre and procedure for processing an optical fibre using this method A method of measuring the twist imparted to an optical fibre includes the steps of advancing the optical fibre in a predetermined direction and at a predetermined velocity, imparting to the optical fibre, during the step of advancing, a twist about its axis, measuri... | 01/04/2005 |
| 6817213 | Method of fabricating optical fiber preform and method of fabricating optical fiber Methods of fabricating an optical fiber preform and a method of fabricating an optical fiber of the invention realize the fabrication of an optical fiber having desirable transmission characteristics in the entire wavelength rage of about 1.3 to 1.6 μm. The fabrica... | 11/16/2004 |
| 6810692 | Method of controlling an upper portion of an optical fiber draw furnace 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 ... | 11/02/2004 |
| 6779363 | Method for pregobbing an optical fiber preform and system producing optical fiber therefrom A method for the pregobbing of an optical fiber preform to provide pre-optimized tip taper and system for drawing optical fiber therefrom. The downtime of an optical fiber drawing apparatus can be considerably shortened, by providing preforms that have a pre-optimiz... | 08/24/2004 |
| 6767579 | Methods for protecting silica-containing article in optical fiber manufacturing A method of protecting a silica-containing article used in the manufacture of an optical fiber includes the step of applying to the silica-containing article a protective layer that facilitates removal of particulates that deposit on the protective layer and that ab... | 07/27/2004 |
| 6758067 | Methods for producing optical fiber by focusing high viscosity liquid The invention is directed to the production of optical fibers from optical fiber preforms using flow physics. The present methods provide for the “drawing” of an optical fiber preform using focusing of the preform by a surrounding fluid, e.g. a heated gas. ... | 07/06/2004 |
| 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 |
| 6733824 | Protecting optical fiber articles during shipment between factories A method of manufacturing a silica-containing article used in the manufacture of an optical fiber includes the steps of applying to the silica-containing article a protective layer, and then transporting the coated article to a second factory for further processing.... | 05/11/2004 |
| 6701753 | Method and apparatus for making improved optical fiber preforms and optical fiber therefrom Embodiments of the invention include a method and apparatus for making optical fiber preforms and optical fiber. The method includes the steps of positioning an overclad tube around a preform core rod, heating the overclad tube along the length thereof in... | 03/09/2004 |
| 6644069 | Method of heating and processing an end of an optical fiber preform and apparatus for heating and processing an end of an optical fiber preform An end heating and processing method of an optical fiber preform. In this method, an optical fiber preform is processed by heating and melting an end of a vitrified optical fiber preform including a core portion and a cladding portion formed on an outer c... | 11/11/2003 |