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| Number | Title | Issue Date |
| 8033141 | Method of manufacturing optical fiber A coating is applied on an optical fiber drawn from a melted tip of an optical-fiber preform. A glass spin is applied to a coated optical fiber by gripping the coated optical fiber with at least a pair of spinning applying rollers arranged in different levels with p... | 10/11/2011 |
| 7891216 | Method for producing an optical fiber having low polarization mode dispersion A method for producing an optical fiber having low polarization mode dispersion, by the steps of a) providing an optical fiber perform of glass material; b) heating the glass material of an end portion of the optical fiber perform; c) drawing the heated glass materi... | 02/22/2011 |
| 7845195 | Optical fiber twisting apparatus with a roller having an accuracy of 15 microns or less An optical fiber twisting apparatus that prevents line distortion in an optical fiber undergoing a drawing process and provides a consistent coating on a bare optical fiber. This optical fiber twisting apparatus includes a twist roller apparatus that having a twist ... | 12/07/2010 |
| 7536877 | Optical fiber fabrication and product An expeditious method for introducing geometric perturbations into lightguide during fabrication offers a perturbation stream of amplitude and periodicity—constant or varying—to satisfy a variety of needs. ... | 05/26/2009 |
| 7383703 | Anti-PMD system for optical fibers An anti-PMD system comprises a pulley which oscillates in rotation and applies a torsion torque alternately in the clockwise direction and in the counterclockwise direction to an optical fiber during drawing of the optical fiber to reduce its PMD. A portion of a per... | 06/10/2008 |
| 7366383 | Optical fiber and method of manufacturing the optical fiber An optical fiber 1 comprising a glass portion 2 having a core 2a and a cladding 2b, and one or more covering layers 3 formed around the glass portion 2, in which an arrangement form of the covering layer 3 | 04/29/2008 |
| 7352939 | Polarization insensitive microbend fiber gratings and devices using the same A microbend-induced fiber grating is formed from a section of optical fiber configured to exhibit “splitting” between the resonant wavelengths supported by the TE and TM components of the LP1m mode and the resonant wavelength supported by the odd/even... | 04/01/2008 |
| 7352971 | Broadband control of polarization mode dispersion A method and system is provided for compensating polarization mode dispersion (PMD) in an optical communications system includes a controller designed to control a broadband PMD compensator to differentially delay light at each one of a plurality of selected wavelen... | 04/01/2008 |
| 7340132 | Polarization insensitive microbend fiber gratings and devices using the same A microbend-induced fiber grating is formed from a section of optical fiber configured to exhibit “splitting” between the resonant wavelengths supported by the TE and TM components of the LP1m mode and the resonant wavelength supported by the odd/even... | 03/04/2008 |
| 7317855 | Method of imparting twist to optical fiber A method for producing low-PMD fiber, in which a glass fiber is drawn from an optical fiber perform by a tractor which pulls such optical fiber from said perform; subsequent to said tractor pulling the fiber is twisted about its axis to increase the magnitude of twi... | 01/08/2008 |
| 7310974 | Method for producing twisted optical fiber with reduced polarization mode dispersion A method for drawing an optical fiber having reduced polarization mode dispersion (PMD) draws an optical fiber from an optical fiber preform whose core ovality is at max about 3%, coats the optical fiber with acrylic polymer and twists the coated optical fiber with ... | 12/25/2007 |
| 7284397 | Method of controlling the polarization mode dispersion of an optical fiber during fiber drawing An optical fiber drawing installation is equipped with an oscillating pulley that applies torsion to the fiber alternately in one rotation direction and then in the opposite direction. To control the torsion applied to the fiber, images are formed of the fiber and t... | 10/23/2007 |
| 7277619 | Nano-imprinted photonic crystal waveguide This invention relates to a method for forming a nano-imprinted photonic crystal waveguide, comprising the steps of: preparing an optical film on a substrate; preparing a template having a plurality of protrusions of less than 500 nm in length such that the protrusi... | 10/02/2007 |
| 7263263 | Method for monitoring spin imparted on optical fiber and method for making optical fiber by using the same A method for monitoring a spin imparted on an optical fiber in order to reduce Polarization Mode Dispersion (PMD) includes the steps of imparting a spin on a high-temperature optical fiber which is drawn from a preform, photographing a dispersion pattern peculiar to... | 08/28/2007 |
| 7245806 | Method for manufacturing an optical fibre having variations in the refractive index A method of manufacturing an optical fibre, which method comprises the steps of: i) providing an optical preform, ii) heating one end of said optical preform, iii) drawing an optical fibre from the... | 07/17/2007 |
| 7209604 | Anti-PMD system The invention provides an anti-PMD system comprising: an anti-PMD pulley (1) over which an optical fiber (4) is to roll and which is mounted to rotate about an axis of rotation (ar); and at least two optical fiber guide devices (2, 3) situated o... | 04/24/2007 |
| 7116870 | Broadband fiber optic tap A broadband optical fiber tap for transferring optical energy out of an optical fiber having an optical fiber with a primary and secondary microbends for the purpose of coupling optical energy into the higher-order modes of the fiber, and a reflecting surface formed... | 10/03/2006 |
| 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 |
| 7035525 | Methods and apparatuses for correcting mechanical twist in optical fiber Methods and apparatuses negate a measured mechanical twist of an optical fiber by introducing a counteracting twist to bring the net mechanical twist closer to zero, which reduces the fiber's polarization mode dispersion (PMD). A spool of optical fiber having undesi... | 04/25/2006 |
| 6993229 | Method of making spun optical fiber with low PMD An optical fiber, and a method of making such optical fiber, wherein the optical fiber exhibits a beatlength greater than about 0.5 meters, and the fiber is spun to provide a polarization mode dispersion in the spun state of said fiber which is less than 0.05 ps/km | 01/31/2006 |
| 6976792 | Optical fiber space transformation Methods and arrangements for providing compact optical paths between an optical connector, such as an MTRJ connector, and optoelectronic chips contained in TO cans. The methods and arrangements employed for creating the optical paths include the use of fibers that a... | 12/20/2005 |
| 6938442 | Method for elongating a cylinder of silica glass According to a prior art method for producing a cylindrical component comprised of silica glass, a cylinder comprised of a softened silica glass mass is drawn in a predetermined drawing direction along a drawing axis by means of a drawing device which acts upon said... | 09/06/2005 |
| 6925230 | Long period chiral fiber grating apparatus A long period chiral fiber grating (“LPCFG”) that has a number of advantageous properties that can be readily utilized in a number of different applications is provided. The inventive LPCFG is a fiber grating having a pitch that exceeds the wavelength of light p... | 08/02/2005 |
| 6922495 | Optical fiber cladding with low polarization-dependent coupling This invention relates to a method of making optical fiber having low polarization dependence. Light propagating through a cladding thereof has a mode group having a first eigenmode propagating at a first speed and a second eigenmode propagating at a second speed. M... | 07/26/2005 |
| 6920271 | Reduced polarization mode dispersion fiber Disclosed is an optical waveguide fiber having a reduced PMD and a method of making the optical waveguide fiber. The optical waveguide fiber in accord with the invention has a particular spin pattern impressed upon the optical waveguide fiber during the drawing step... | 07/19/2005 |
| 6909851 | Dispersion compensation apparatus including a fixed dispersion compensator for coarse compensation and a variable dispersion compensator for fine compensation An apparatus which compensates for dispersion in an optical transmission line. The apparatus includes a fixed dispersion compensator and a variable dispersion compensator. The fixed dispersion compensator has a fixed dispersion amount and coarsely compensates for th... | 06/21/2005 |
| 6876804 | Method of making a spun optical fiber with low polarization mode dispersion An optical fiber, and a method of making such optical fiber, wherein the optical fiber exhibits a beatlength greater than about 5 meters, and the fiber is spun to provide a polarization mode dispersion in the spun state of said fiber which is less than 0.05 ps/km | 04/05/2005 |
| 6859596 | Systems and methods for forming ultra-low PMD optical fiber using amplitude and frequency keyed fiber spin functions A system and method is disclosed for manufacturing single mode optical fiber which incorporates a spin in the molten fiber during manufacturing. The introduction of spin minimizes a form of distortion called polarization mode dispersion (PMD) and varying the spin, i... | 02/22/2005 |
| 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 |
| 6789399 | Method for measuring the twisting of an optical fiber, and a method and apparatus for manufacturing optical fibers When an optical fiber 3 is formed by drawing a preform 1, twisting is generated in the optical fiber 3. An outer diameter of the optical fiber 3 is continuously measured along a longitudinal direction of the optical fiber 3 from tw... | 09/14/2004 |
| 6735985 | Method of impressing a twist on a multimode fiber during drawing The specification describes a technique for drawing circular core multimode optical fiber using twist during draw to increase fiber bandwidth. ... | 05/18/2004 |
| 6647748 | Device for continuously twisting an optical fiber A device for continuously twisting an optical fiber, which can add a sufficient twist to an optical fiber, is provided. Reciprocating rollers reciprocate so that the moving direction would be opposite each other along a center axis of rotation. The optica... | 11/18/2003 |
| 6550283 | Method for introducing controlled spin in optical fibers Optical fiber is provided with a periodically reversing spin while the fiber is pulled through a melt zone. A cooled region of the fiber downstream from the melt zone passes between a pair of opposed elements. The opposed elements are moved so that surfac... | 04/22/2003 |
| 6550282 | Method and apparatus for manufacturing an optical fiber from a preform A method for manufacturing an optical fiber (100) having low PMD, comprises the steps of: a) heating at least one end portion (3a) of a preform (3); b) drawing an optical fiber (100) from a free end of said heated end portion (3a) along a fiber drawing axis (I... | 04/22/2003 |
| 6550281 | Method for providing controlled spin in optical fiber A fiber (106) having low polarization mode dispersion is made by heating the end of a preform (100) with a furnace (101). The fiber is drawn from the heated end. The fiber passes between two rollers (102, 104). As the fiber passes therebetween, the angula... | 04/22/2003 |
| 6422043 | Method of making an improved multimode optical fiber and fiber made by method Our method of making high bandwidth silica-based multimode optical fiber comprises provision of a non-circular preform, and drawing fiber of chiral structure from the preform. The non-circular preform can be made by maintaining the inside of the tubular p... | 07/23/2002 |
| 6347537 | Method of drawing a twisted optical fiber An optical fiber is rolled by a swing motion of a swing guide roller in order to impart a predetermined twist to it effectively, and its polarization dispersion is suppressed equivalently as in a perfectly circular concentric optical fiber. A method of ma... | 02/19/2002 |
| 6327876 | Method for producing a coated optical fiber with reduced polarization mode dispersion An apparatus and method for forming a optical fiber (102) which includes a furnace (104) for softening an optical fiber blank (106); a tractor (114) for drawing the optical fiber (102) from the softened optical fiber blank (106); and a first applicator (1... | 12/11/2001 |
| 6324872 | Method and apparatus for introducing controlled spin in optical fibers Optical fiber is provided with a periodically reversing spin while the fiber is pulled through a melt zone. A cooled region of the fiber downstream from the melt zone passes between a pair of opposed elements. The opposed elements are moved so that surfac... | 12/04/2001 |
| 6240748 | Frequency and amplitude modulated fiber spins for PMD reduction The invention provides improved methods for reducing polarization mode dispersion (PMD) in single mode fiber by spinning the fiber during the drawing process in accordance with a spin function having sufficient harmonic content to achieve low levels of PM... | 06/05/2001 |
