Loose Tube Type Patents (Class 385/109)
  • Patent number: 7693374
    Abstract: Fiber optic distribution cables and methods for manufacturing the same are disclosed. The methods present one or more optical fibers outward of the protective covering for distribution of the same toward the subscriber. Specifically, the methods include presenting a length of distribution optical fiber outward of the protective covering that is longer than the opening at access location. After the opening is made in the protective covering at the access location, the optical fibers for distribution are selected. Then a tool according to the present invention is positioned about the optical fibers selected for distribution and slid within the protective covering of the fiber optic distribution cable until it reaches a cutting location within the fiber optic distribution cable. Consequently, the tool is positioned for cutting the distribution optical fiber at a cutting location within the fiber optic distribution cable at a downstream location.
    Type: Grant
    Filed: May 11, 2006
    Date of Patent: April 6, 2010
    Assignee: Corning Cable Systems LLC
    Inventors: Joseph T. Cody, Dennis M. Knecht, Christopher Paul Lewallen, James P. Luther
  • Publication number: 20100067855
    Abstract: Disclosed is a buffer tube that possesses a higher buffer-tube filling coefficient. Optical fibers enclosed within the buffer tube demonstrate improved attenuation performance when subjected to temperature variations between about ?40° C. and 70° C. The buffer tube is suitable for deployments requiring mid-span access.
    Type: Application
    Filed: September 11, 2009
    Publication date: March 18, 2010
    Applicant: DRAKA COMTEQ B.V.
    Inventor: Jeffrey Scott Barker
  • Publication number: 20100046895
    Abstract: Apparatus for installing a cable into a tube with the assistance of a fluid drag acting on the cable within the tube, the apparatus including:—installation means for driving the cable into the tube, wherein in use the cable is resistant to being conveyed to the installation means, and—reduction means for reducing the conveyance resistance of the cable.
    Type: Application
    Filed: March 31, 2008
    Publication date: February 25, 2010
    Inventors: Philip A. Barker, Christopher N. Munnings, Ian Hunter
  • Patent number: 7668425
    Abstract: A bi-directional cable assembly for use with a fiber optic cable that includes at least one cable optical fiber that can carry bi-directional optical signals. The cable assembly is connected to the fiber optic cable at a mid-span location, where the cable fiber is preterminated to form upstream and downstream cable fiber sections. A tether having an upstream and/or a downstream tether fiber is spliced to corresponding preterminated upstream and/or downstream cable fibers at respective one or more splice locations. At least one of the tether fibers is a bend-resistant optical fiber that includes a bend angle equal to or about 180 degrees so that the tether extends in one direction from the mid-span access point along the fiber optic cable. A low-profile protective cover covers the mid-span access point and an end-portion of the tether. A protective tube may be used to house the bend-improved fiber and the splices that connect the cable fiber sections to the tether fibers.
    Type: Grant
    Filed: November 7, 2008
    Date of Patent: February 23, 2010
    Assignee: Corning Cable Systems LLC
    Inventors: Robert Bruce Elkins, II, Johannes Ian Greveling, Stephen Robert Horan, Jr.
  • Patent number: 7664354
    Abstract: A fiber cable having at least one fiber optic element, a water swellable powder, disposed on the fiber optic element and a tube surrounding the fiber element and the water swellable powder. The fiber optic element is in a loose non-coupled arrangement with respect to the inside of the tube such that during installation, mechanical installation stresses applied to the cable and the tube are not imparted to the fiber optic element therein.
    Type: Grant
    Filed: November 16, 2006
    Date of Patent: February 16, 2010
    Assignee: Nexans
    Inventors: David Keller, Bernard Michael Blell
  • Patent number: 7660501
    Abstract: A fiber optic cable assembly comprising a first fiber optic cable having pre-selected optical fibers pre-terminated and branched at a cable access point, a second cable optically connected to the pre-terminated optical fibers, and a flexible body encapsulating the cable access point. A method for manufacturing a fiber optic cable assembly comprising providing a fiber optic cable, making an opening in the cable for access, pre-terminating pre-selected optical fibers, optically connecting the pre-selected optical fibers with optical fibers of a tether cable, and encapsulating at least a portion of the cable access location within a flexible overmolded body.
    Type: Grant
    Filed: October 6, 2008
    Date of Patent: February 9, 2010
    Assignee: Corning Cable Systems LLC
    Inventors: Robert B. Elkins, II, James P. Luther, Lars K. Nielsen, Thomas Theuerkorn
  • Patent number: 7650055
    Abstract: An environmentally sealed closure, such as a terminal for terminated ends of fiber optic cables, includes a housing having a wall defining an interior volume. A floating sealing assembly is provided including a first plate, a seal member and a second plate arranged in a stack within the interior volume. The seal member has an outer sealing edge for contacting the wall of the housing, which may be straight and/or chamfered. Fiber optic cables extend through the sealing assembly so that the terminated ends are within the splice area. The floating sealing assembly is compressed so as to place the outer sealing edge of the seal member in sealing contact with the wall of the housing. When a pressure differential exists between the splice area and the outside of the housing only one of the first or second plates moves along the longitudinal axis to further compress the seal member and increase sealing between the outer sealing edge and the housing wall.
    Type: Grant
    Filed: July 27, 2007
    Date of Patent: January 19, 2010
    Assignee: Corning Cable Systems LLC
    Inventors: Terry Dean Cox, Ziwei Liu, Marcel G. Mures, Diana Rodriguez, Howard C. Schwartz, Kevin L. Strause
  • Publication number: 20100008632
    Abstract: A breathable downhole fiber optic cable is provided having an outer protective tube; a fiber optic tube having a plurality of optical fibers contained therein; at least one annulus disposed between the outer protective tube and the fiber optic tube; and at least one path, extending through the length of the fiber optic cable, which provides a channel for a purge gas to flow for removing a second gas, such as hydrogen, from the fiber optic cable.
    Type: Application
    Filed: October 23, 2007
    Publication date: January 14, 2010
    Applicant: AFL TELECOMMUNICATION LLC
    Inventor: Brian Herbst
  • Patent number: 7646953
    Abstract: Purging interior regions of a cable reduces or prevents hydrogen darkening of an optical fiber located in the cable. While hydrogen may permeate through an outer surface of the cable, fluid circulating through the cable purges the hydrogen from within the cable. This circulation of the fluid occurs between an inner tube containing the fiber and an outer tube surrounding the inner tube.
    Type: Grant
    Filed: June 16, 2008
    Date of Patent: January 12, 2010
    Assignee: Weatherford/Lamb, Inc.
    Inventors: Edward M. Dowd, John J. Grunbeck
  • Patent number: 7639915
    Abstract: Disclosed is an optical fiber cable that includes optical fibers and a deformable coupling element enclosed within a buffer tube. The coupling element is formed from a deformable yet substantially incompressible material that is capable of releasably and intermittently coupling the optical fibers to the buffer tube in various orientations. The design of the coupling element layer permits coupling of the optical fibers to the buffer tube without the use of a compressive cushioning layer and yet permits localized movement the optical fibers relative to the buffer tube to account for disparate thermal expansion and to accommodate optical fiber placement.
    Type: Grant
    Filed: June 26, 2008
    Date of Patent: December 29, 2009
    Assignee: Draka Comteq B.V.
    Inventors: Don Parris, Greg DeChristopher, Justin Elisha Quinn
  • Publication number: 20090310924
    Abstract: A cable assembly comprising a fiber optic cable and one or more attachment points to allow one or more tethers to optically connect to optical fibers within the cable. The cable assembly may be used as a drop cable for extending optical connections to a plurality of points. An attachment structure is provided for maintaining the tether to the cable to prevent damage to the tether. The attachment structure provides a loose attachment to allow the tether to move relative to the distribution cable, so the tether can move in a generally translational movement, is able to slightly twist, and to have limited lateral movement during coiling, installation, and removal of the cable assembly. This loose attachment structure may prevent damage to the tether due to forces being placed on the cable, such as during coiling or uncoiling of the cable. In one exemplary embodiment, the attachment structure is attached to the cable and receives the tether.
    Type: Application
    Filed: August 21, 2009
    Publication date: December 17, 2009
    Inventors: Joseph T. Cody, Stephen R. Horan, JR., Radawan Hall, James P. Luther
  • Patent number: 7630605
    Abstract: Disclosed are fiber optic assemblies having at least one optical fiber and a water-swellable powder within a tube and/or cavity and methods for making the same. Fiber optic assemblies of the present invention use relatively low-levels of water-swellable powder while still effectively blocking the migration of tap water and/or saline solutions of 3% by weight along the tube and/or cavity. Furthermore, cleaning of the optical fibers is not necessary before connectorization like with conventional fiber optic cables that use a gel or grease. Generally speaking, at least some of the water-swellable powder is transferred to the inside surface of the tube, cavity, optical fiber or the like; rather, than being a loose powder that is able to migrate within the tube or cavity. Moreover, the existence of water-swellable powder within the fiber optic assembly or cable is nearly transparent to the craft since relatively low-levels are possible.
    Type: Grant
    Filed: June 26, 2007
    Date of Patent: December 8, 2009
    Assignee: Corning Cable Systems LLC
    Inventors: Anne G. Bringuier, Warren W. McAlpine, Christopher M. Quinn, John A. Rowe, Dave A. Seddon, Catharina L. Tedder, Gilbert D. Tugman, Brian S. Witz, George Ndayizeye
  • Publication number: 20090297106
    Abstract: A method for manufacturing an optical cable for communication includes at least one micromodule, said micromodule being blocked with respect to the propagation of water. The method includes the steps of providing at least one optical fiber; embedding the at least one optical fiber in a pseudoplastic filling compound having a viscosity of 3 Pa·s to 30 Pa·s, preferably 7 Pa·s to 25 Pa·s at a shear rate of 10 s?1 and at a temperature of 100° C., and a cross-over lower than 30 Hz, preferably 5 Hz to 25 Hz, at a temperature of 100° C.; and extruding a retaining element made of a thermoplastic polymeric composition around the at least one optical fiber so embedded in the filling compound to obtain a micromodule.
    Type: Application
    Filed: September 27, 2004
    Publication date: December 3, 2009
    Inventors: Massimo Pizzorno, Alessandro Ginocchio, Massimiliano Pavan, Davide Ceschiat
  • Publication number: 20090279833
    Abstract: A buffer tube arrangement includes an adhesive material to adhesively bond a water-swellable element to a plurality of optical fibers and/or a buffer tube.
    Type: Application
    Filed: July 21, 2009
    Publication date: November 12, 2009
    Applicant: DRAKA COMTEQ B.V.
    Inventors: Bob J. Overton, Wayne Cheatle, Greg DeChristopher
  • Patent number: 7609926
    Abstract: An optical fiber cable maintains an outer jacket, at least one optical fiber tube within the jacket and for each optical fiber tube, four optical fibers, arranged in a substantially squared arrangement. The optical fibers are linearly arranged along the length of the cable. The optical fibers are loosely arranged within the fiber tube in such a manner as to allow shifting of the straight optical fibers to conform to a bending of the cable, while being simultaneously constrained such that the straight arranged fibers do not become crossed-over or overlapped during bending.
    Type: Grant
    Filed: August 14, 2007
    Date of Patent: October 27, 2009
    Assignee: Nexans
    Inventors: Jeff Rosenquist, David Keller
  • Publication number: 20090263089
    Abstract: A fiber optic cable having a jacket, at least one tube and at least two fibers within the tube in a loose tube arrangement. The fibers within the tube have a fiber length differential substantially in the range of 0.01%-0.04%.
    Type: Application
    Filed: January 14, 2009
    Publication date: October 22, 2009
    Inventors: David Keller, Norman Andrew Punch, JR., Jerry Freeman, Bulent Kose, Jeff Rosenquist, Lisa Huff, Alfred Flores
  • Publication number: 20090257721
    Abstract: An optical transmission element has a number of optical waveguides, which are arranged as a bundle and are embedded in a filling composition. The optical waveguides and the filling composition are surrounded by a tube. A material comprising a resin, which for example contains an acrylate enriched with a filler, is used as materials for the tube. By mixing photoinitiators into the material comprising the resin of the tube, the tube material of the tube can be cured by irradiation with ultraviolet light. The use of a material comprising resin in the production of the tube of the optical transmission element allows thin buffering layers to be produced at a high material processing speed.
    Type: Application
    Filed: June 16, 2009
    Publication date: October 15, 2009
    Inventors: Dieter Kundis, Gunter Wunsch, Gerhard Merbach
  • Patent number: 7590322
    Abstract: A fiber optic cable can inhibit water, that may inadvertently enter the cable, from damaging the cable's optical fibers. The fiber optic cable can comprise a buffer tube defining an interior volume extending along the fiber optic cable. Optical fibers can be disposed in the interior volume of the buffer tube, along with water-swellable materials, such as tapes and yarns. The interior volume can be dry or free from water-blocking gels or fluids. The water-swellable materials can provide the fiber optic cable with an unexpected level of protection from seawater. The water-swellable materials can, for example, limit flow of seawater along the interior volume. In an exemplary embodiment, progression of seawater in the interior volume be limited to three meters or less for a twenty four hour test period during which the seawater is under about one meter of head pressure.
    Type: Grant
    Filed: March 7, 2008
    Date of Patent: September 15, 2009
    Assignee: Superior Essex Communications LP
    Inventors: James J. Puzan, Christopher W. McNutt, Jeffrey S. Laws
  • Patent number: 7577329
    Abstract: A data communication cable can comprise multiple pairs of twisted conductors. A jacket that extends along the outside surface of the cable can define a longitudinal core, internal to the cable. The conductor pairs can be disposed in the core of the cable along with a foam matrix or a porous filler, with the matrix and the conductors occupying essentially all of the volume of the core. The foam matrix can hold each conductor pair in a respective location within the cable core to control signal crosstalk on each pair. A co-extrusion process can produce the cable via simultaneously extruding the foam matrix and the jacket. A pulling apparatus can feed the conductor pairs though respective ports of an extrusion head-and-die assembly. As one extruder encases the moving conductor pairs in the foam matrix, another extruder forms the jacket over the matrix and the embedded conductors.
    Type: Grant
    Filed: March 14, 2007
    Date of Patent: August 18, 2009
    Assignee: Superior Essex Communications LP
    Inventor: Jeffrey H. Mumm
  • Patent number: 7574086
    Abstract: Disclosed is installation of an optical fiber composite electric power cable. An installation method of an optical fiber composite electric power cable includes installing an electric power cable including a conductor and an air-blown installation tube therein at an installation region; connecting tubes of adjacent electric power cables to each other, in an electric power cable connection box; and installing an optical fiber unit into the connected tubes by air pressure. Also, a cable structure used for installing the optical fiber composite electric power cable includes a conductor for electric power transmission; an insulator surrounding the conductor; an air-blown installation tube provided outside of the insulator; and a corrosion-protective layer provided to an outermost layer of the cable.
    Type: Grant
    Filed: June 30, 2005
    Date of Patent: August 11, 2009
    Assignee: LS Cable, Ltd.
    Inventors: Duk-Jin Oh, Jong-Cheol Kim
  • Patent number: 7570853
    Abstract: The invention relates to high-strength, abrasion-resistant optical fiber cable having a supplemental layer consisting essentially of a liquid crystal polymer (LCP) to enhance the cable's tensile strength and hermetically seal it, and an outermost encasing layer to protect the LCP supplemental layer from damage that could otherwise diminish the tensile strength or destroy the moisture barrier properties of the cable gained by adding the supplemental liquid crystal polymer layer. The encasing layer is preferably a thin layer of a smooth, non-crystalline thermoplastic that can be easily removed with chemicals that do not affect the properties of the supplemental layer so that the supplemental layer can be made accessible for promoting the formation of hermetically sealed interfaces between the cable and other structures. Cross-head extrusion methods for coating optical fibers with LCP and encasing layers are described along with laser and ultrasonic bonding techniques for fabricating hermetic packages.
    Type: Grant
    Filed: November 27, 2007
    Date of Patent: August 4, 2009
    Assignee: Linden Photonics, Inc.
    Inventors: Amaresh Mahapatra, Robert J. Mansfield
  • Patent number: 7570855
    Abstract: A conduit bundle includes an inner bundle of first-type conduits extending between inner-bundle first and second ends. The first-type conduits are mutually and adjacently bonded along coinciding portions of their lengths in order to define an inner-bundle rigid region that, as view into a plane orthogonal to the longitudinal axis of the inner-bundle rigid region, exhibits an inner-bundle periphery. A separation structure including a structure wall having structure-wall inside and outside surfaces is provided and the inside surface thereof is bonded to the periphery of the inner-bundle rigid region. The conduit bundle further includes a plurality of second-type conduits. Each second-type conduit includes a rigidly bonded region along at least a portion of the length thereof that is bonded to at least one of (i) the structure-wall outside surface and (ii) the bonded region of another second-type conduit of the plurality of second-type conduits.
    Type: Grant
    Filed: January 26, 2007
    Date of Patent: August 4, 2009
    Assignee: Schott Corporation
    Inventors: Richard Strack, Martin Freundt
  • Patent number: 7570854
    Abstract: A multi-tube optical fiber cable includes a plurality of optical fiber tubes, each having one or more optical fibers loosely arranged therein. The optical fiber tubes are arranged within an outer jacket, where the tubes are constructed of a polymer having a low Young's constant modulus. A binder is arranged around the plurality of optical fiber tubes, where the binder is substantially flat in shape such that there is no deformation of the tube, when the binder is applied.
    Type: Grant
    Filed: December 31, 2007
    Date of Patent: August 4, 2009
    Assignee: Nexans
    Inventors: David Keller, Daniel Poole
  • Patent number: 7567739
    Abstract: Disclosed is a fiber optic cable that includes optical fibers and a water-swellable element, such as a powder-free fabric tape, that are enclosed within a buffer tube. Adhesive material, such as discrete domains of adhesive foam, may be optionally employed to provide adhesive coupling of the optical fibers and the water-swellable element.
    Type: Grant
    Filed: January 31, 2008
    Date of Patent: July 28, 2009
    Assignee: Draka Comteq B.V.
    Inventors: Bob J. Overton, Wayne Cheatle, Greg DeChristopher
  • Patent number: 7561771
    Abstract: A method of installing a double ended distributed sensing optical fiber assembly within a guide conduit. The optical fiber sensing assembly has a first elongate section with a first proximal end and a first distal end, and a second elongate section with a second proximal end and a second distal end. The method includes providing a nose section having an outer width less than about 1 cm, which interconnects the first proximal end to the second proximal end such that light transmitted along the length of the first elongate section is transmitted via the nose section into the second elongate section, inserting the nose section into the guide conduit such that the nose section moves through the guide conduit ahead of the first elongate section and the second elongate section; and connecting the first distal end and the second distal end to a light transmission and receiving unit.
    Type: Grant
    Filed: July 26, 2004
    Date of Patent: July 14, 2009
    Assignee: Shell Oil Company
    Inventors: Kari-Miko Jääskeläinen, Alexander Michael Van Der Spek
  • Patent number: 7537393
    Abstract: A connectorized fiber optic cabling assembly includes a loose tube fiber optic cable and a connector assembly. The cable has a termination end and includes: an optical fiber bundle including a plurality of optical fibers; at least one strength member; and a jacket surrounding the optical fiber bundle and the at least one strength member. The connector assembly includes a rigid portion and defines a fiber passage. The connector assembly is mounted on the termination end of the cable such that the optical fiber bundle extends through at least a portion of the fiber passage. The plurality of optical fibers of the optical fiber bundle have a ribbonized configuration in the rigid portion of the connector assembly and a loose, non-ribbonized configuration outside the rigid portion. The plurality of optical fibers undergo a transition from the ribbonized configuration to the loose, non-ribbonized configuration in the rigid portion of the connector assembly.
    Type: Grant
    Filed: May 22, 2006
    Date of Patent: May 26, 2009
    Assignee: Commscope, Inc. of North Carolina
    Inventors: Timothy W. Anderson, Richard L. Case
  • Publication number: 20090129734
    Abstract: A loose tube fiber optic cable having at least one optical fiber, a loose tube surrounding the fiber, with the tube having an irregular inner surface. A water swellable powder is provided around the fiber and inside the tube, where the particles of the water swellable powder rest in the irregular inner surface of the tube.
    Type: Application
    Filed: November 3, 2008
    Publication date: May 21, 2009
    Inventors: David Keller, Jeff Rosenquist, Robert Pruitt, Allen L. Jones
  • Patent number: 7529450
    Abstract: A fiber optic cable can comprise small spheres or balls disposed in the cable's interstitial spaces, for example between the cable's optical fibers and a surrounding buffer tube. The spheres can comprise foam rubber, closed-cell or open-cell porous polymer, or some other soft material. Typical diameters for the spheres can be in a range of 1 to 2.5 millimeters. A soft composition of the spheres can cushion the optical fibers and physically impede water ingress into the cable. Additional fiber protection can arise from the ability of the loose spheres to rotate individually, in a ball-bearing effect. Thus, sphere-to-sphere motion can absorb physical stresses associated with bending, twisting, bumping, and stretching the cable during installation, thereby shielding the fibers from damage.
    Type: Grant
    Filed: February 23, 2007
    Date of Patent: May 5, 2009
    Assignee: Superior Essex Communications LP
    Inventor: Thomas C. Cook
  • Patent number: 7522795
    Abstract: The present invention relates to loose tube optical waveguide fiber cable which is optimized for easy and fast installation as plenum cable, such as in customer premises for FTTH (fiber to the home) applications. One of the objects of the present invention is to provide a loose tube optical waveguide fiber cable which is suitable for fixed in-house cabling at extremely low-cost for a large-scale installation of FTTH.
    Type: Grant
    Filed: August 31, 2007
    Date of Patent: April 21, 2009
    Assignee: Draka Comteq B.V.
    Inventors: Klaus Nothofer, Peter Lausch
  • Patent number: 7515795
    Abstract: A water-swellable material is included for water-blocking inside a buffer tube in a cable design, and an adhesive material is provided in or on the water-swellable material. The adhesive material may function as a bonding agent between the water-swellable material and the inside wall of a buffer tube, thus providing coupling of the water-swellable material to the buffer tube. In addition, or alternatively, a second adhesive material may be provided for bonding the optical fibers to the water-swellable material. The adhesive materials may be in the form of a bead or beads and may be foamed or unfoamed.
    Type: Grant
    Filed: June 14, 2006
    Date of Patent: April 7, 2009
    Assignee: Draka Comteq B.V.
    Inventors: Bob Overton, Wayne Cheatle, Greg Dechristopher
  • Patent number: 7499617
    Abstract: A fiber optic cable can comprise spheres or balls that are coated with a water absorbent material, such as a super absorbent polymer (“SAP”). The spheres can provide clean and efficient carriers for introducing SAP into the cable during manufacturing. The spheres can have a diameter in a range of 20 microns to 2.5 millimeters and can be disposed in the cable's interstitial spaces, for example between the cable's optical fibers and a surrounding buffer tube. The SAP material can adhere to the spheres as a cross-linked coating or via electrostatic charge, for example. Beyond absorbing any water that may enter the cable, the spheres can provide cushioning or mechanical protection for the optical fibers. When the cable receives stress, motion among the spheres can absorb the stress to shield the fibers from damage.
    Type: Grant
    Filed: February 23, 2007
    Date of Patent: March 3, 2009
    Assignee: Superior Essex Communications LP
    Inventor: Thomas C. Cook
  • Publication number: 20090041414
    Abstract: Disclosed is a method accessing one or more optical fibers in a telecommunication cable in a way that considerably reduces the risk of damaging the optical fibers. To avoid inadvertent damage caused by a cutting tool, the method includes moving optical fibers and/or micromodules away from the area on the cable that is to be cut.
    Type: Application
    Filed: April 11, 2008
    Publication date: February 12, 2009
    Applicant: DRAKA COMTEQ B.V.
    Inventors: Alain Lavenne, Olivier Tatat, Jean-Pierre Bonicel
  • Patent number: 7489844
    Abstract: A robust fiber optic cable, which is well suited for harsh environments, such as undersea environments when attached as a tether to a mobile undersea vehicle includes an optical fiber loosely surrounded by an inner containment tube. A suspension fluid is disposed between the inner containment tube and the optical fiber. A plurality of strength members surrounds the inner containment tube, and an outer jacket surrounds said plurality of strength members. In preferred embodiments, the outer jacket is bonded to the strength members and/or the inner containment tube.
    Type: Grant
    Filed: January 8, 2007
    Date of Patent: February 10, 2009
    Assignee: Commscope, Inc. of North Carolina
    Inventor: Jarrett Shinoski
  • Publication number: 20090010602
    Abstract: Disclosed is a dry, semi-tight optical fiber unit that includes one or more optical fibers positioned within a buffer tube. A protective coating is provided upon the surface of the optical fibers, and an anti-adhesive coating is substantially bonded to the protective coating. One or more of these optical fiber units may be included in an optical cable. Also disclosed is a method for efficiently producing such an optical fiber unit.
    Type: Application
    Filed: December 21, 2007
    Publication date: January 8, 2009
    Applicant: DRAKA COMTEQ B.V.
    Inventors: Klaus Nothofer, Dick Huijsman, Arnoldus Gertrudis Wilhelmus Marie Berkers
  • Publication number: 20090003780
    Abstract: Disclosed are fiber optic assemblies having at least one optical fiber and a water-swellable powder within a tube and/or cavity and methods for making the same. Fiber optic assemblies of the present invention use relatively low-levels of water-swellable powder while still effectively blocking the migration of tap water and/or saline solutions of 3% by weight along the tube and/or cavity. Furthermore, cleaning of the optical fibers is not necessary before connectorization like with conventional fiber optic cables that use a gel or grease. Generally speaking, at least some of the water-swellable powder is transferred to the inside surface of the tube, cavity, optical fiber or the like; rather, than being a loose powder that is able to migrate within the tube or cavity. Moreover, the existence of water-swellable powder within the fiber optic assembly or cable is nearly transparent to the craft since relatively low-levels are possible.
    Type: Application
    Filed: June 26, 2007
    Publication date: January 1, 2009
    Inventors: Anne G. Bringuier, Warren W. McAlpine, Christopher M. Quinn, John A. Rowe, Dave A. Seddon, Catharina L. Tedder, Gilbert D. Tugman, Brian S. Witz, George Ndayizeye
  • Patent number: 7471860
    Abstract: A tubular and a jacketed cable combination includes a strip of material helically wound about itself to form a tubular structure having an inside dimension and an outside dimension, one or more optic fibers disposed within a filler material, a jacket disposed about the filler material to protect the same and an affixation between the jacket and the tubular and methods of making the combination and the cable.
    Type: Grant
    Filed: May 11, 2007
    Date of Patent: December 30, 2008
    Assignee: Baker Hughes Incorporated
    Inventors: Martin P. Coronado, Stephen L. Crow, Vinay Varma
  • Patent number: 7466888
    Abstract: A buffer tube having therein a ribbon stack formed of optical fiber ribbons, and at least one filler ribbon provided on at least a top or bottom surface of the ribbon stack. The filler ribbon is provided to increase coupling between the ribbon stack and the buffer tube and to reduce fiber attenuation.
    Type: Grant
    Filed: September 12, 2006
    Date of Patent: December 16, 2008
    Assignee: Draka Comteq BV
    Inventors: Justin Quinn, Patrick King Strong
  • Patent number: 7466887
    Abstract: An optical fiber cable having a polymeric component, in particular a buffer tube, suitable for both terrestrial and undersea uses. The polymeric material forming the component has a copolymer of propylene with a C4-C8 ?-olefin and preferably a nucleating agent disbursed therein. The obtained component shows improved dimensional stability, which guarantees its non-deformability, and high transparency and can be extruded at lower extrusion temperatures.
    Type: Grant
    Filed: May 21, 2002
    Date of Patent: December 16, 2008
    Assignee: Prysmian Cavi E Sistemi Energia S.R.L.
    Inventors: Luca Castellani, Mauro Maritano, Giovanni Brandi
  • Publication number: 20080298755
    Abstract: A communications ducting system, and method of laying a communications duct assembly below a surface, usually in a carriageway or footpath, using an open slot which is subsequently backfilled. The width of the slot is preferably not substantially greater than the narrowest outer cross sectional width of the duct assembly. In at least one direction, the duct assembly has a dimension of less than 20 mm and thus the slot need be no more than 20 mm wide. The duct assembly can be laid along the bottom of the slot, preferably on a layer of sand or other bedding material. Access chambers may provide fibre blowing points along the slot for installing optical fibre in the duct assembly after the assembly is in place, either for the original installation of the fibres or for repair purposes. The access chambers can also be used to accommodate changes in direction of the slot and for repairs in the duct assembly.
    Type: Application
    Filed: November 2, 2005
    Publication date: December 4, 2008
    Applicant: FIBRESPAN LIMITED
    Inventors: Peter Caplan, Robert Bicket
  • Publication number: 20080289851
    Abstract: A modular cable unit for oilfield wireline includes multiple cable modules. The cable modules are interchangeable to achieve a modular cable unit with desired telemetry and electrical properties to suit a specific application. The cable modules can be an optical fiber module, a power cable or an opto-electrical module assembly. The cable modules that make up the modular cable unit are preferably arranged in a triad configuration defining a substantially triangular tangent periphery and are surrounded by a polymeric casing having a circular periphery. The triad configuration of the modular cable unit contributes to an improved mechanical strength. A floating-tube type optical fiber element with improved mechanical strength is also disclosed.
    Type: Application
    Filed: May 21, 2007
    Publication date: November 27, 2008
    Inventors: Joseph Varkey, Vladimir Hernandez-Solis, Marwan Moufarrej
  • Patent number: 7454107
    Abstract: Fiber optic drop cables are disclosed that are suitable for automated preconnectorization. In one embodiment, an optical waveguide is disposed in a buffer tube that has two strength components disposed on opposite sides thereof and a plurality of strength members. The plurality of strength members are disposed at a plurality respective interstices located between the buffer tube and the two strength components and shaped into a plurality of substantially triangular shapes for improving the balancing of the residual stresses in the fiber optic cable caused by the shrinkage of a cable jacket during cooling. In another embodiment, a fiber optic cable includes a tonable lobe connected by a web that is frangible and the web includes predetermined ratios for easily and reliable separation of the tonable lobe.
    Type: Grant
    Filed: November 1, 2005
    Date of Patent: November 18, 2008
    Assignee: Corning Cable Systems LLC
    Inventors: Allen M. Miller, Warren W. McAlpine
  • Patent number: 7450804
    Abstract: A fiber optic cable assembly comprising a first fiber optic cable having pre-selected optical fibers pre-terminated and branched at a cable access point, a second cable optically connected to the pre-terminated optical fibers, and a flexible body encapsulating the cable access point. A method for manufacturing a fiber optic cable assembly comprising providing a fiber optic cable, making an opening in the cable for access, pre-terminating pre-selected optical fibers, optically connecting the pre-selected optical fibers with optical fibers of a tether cable, and encapsulating at least a portion of the cable access location within a flexible overmolded body.
    Type: Grant
    Filed: September 15, 2006
    Date of Patent: November 11, 2008
    Assignee: Corning Cable Systems LLC
    Inventors: Robert B. Elkins, II, James P. Luther, Lars K. Nielsen, Thomas Theuerkorn
  • Patent number: 7447406
    Abstract: An optical fiber unit having a sheath and a plurality of optical fiber elements loosely housed in the sheath. The sheath is coated with particles of an adherence reducing substance and has a radial thickness that is not substantially greater than 0.3 mm. The coating of adherence reducing particles is applied as a liquid coating. The liquid coating is a dispersion of the particles and heat is applied to evaporate the liquid content of the liquid coating to produce a dry coating of particles on the sheath.
    Type: Grant
    Filed: May 26, 2006
    Date of Patent: November 4, 2008
    Assignees: Prysmian Cables & Systems Limited, Pirelli S.p.A.
    Inventors: Ralph Sutehall, Martin Vincent Davies, Roger John Pike, Davide Ceschiat, Massimo Pizzorno
  • Publication number: 20080267569
    Abstract: An optical cable for communication includes at least one retaining element blocked with respect to the water propagation as well as a process for manufacturing such an optical cable. The optical cable includes, in addition to the retaining element, at least two transmission elements housed within the retaining element and a water swellable yarn housed within the retaining element. The water swellable yarn is selected according to the following equation: V w V TF = k V t + R ( 1 ) in which VW is the volume of the water swellable yarn after swelling upon contact with water; VTF is the total free volume in the retaining element; k is a constant ?180; R is a constant ?1.4; and Vt is the free volume per each transmission element. Advantageously, the optical cable is water-blocked and the water swellable yarn does not induce microbending effects on the transmission elements.
    Type: Application
    Filed: November 5, 2004
    Publication date: October 30, 2008
    Inventors: Alessandro Ginocchio, Enrico Consonni, paolo Arturo Presa, Massimo Pizzorno, Mauro Maritano
  • Patent number: 7444051
    Abstract: A conductor module (M) comprises a jacket (E) tightly accommodating, in the manner of tubing, at least two flexible conductors (C). The conductors (C) are coated with a small amount of oil (H) having a viscosity strictly less than 100 millipascal second (mPa.s) so as to allow control of the slippage of the jacket (E) in relation to the conductors (C) and longitudinal impenetrability inside the module (M).
    Type: Grant
    Filed: December 20, 2004
    Date of Patent: October 28, 2008
    Assignee: Draka Comteq B.V.
    Inventors: Olivier Tatat, Alain Avrons, Jean-Pierre Bonicel
  • Publication number: 20080247718
    Abstract: Purging interior regions of a cable reduces or prevents hydrogen darkening of an optical fiber located in the cable. While hydrogen may permeate through an outer surface of the cable, fluid circulating through the cable purges the hydrogen from within the cable. This circulation of the fluid occurs between an inner tube containing the fiber and an outer tube surrounding the inner tube.
    Type: Application
    Filed: June 16, 2008
    Publication date: October 9, 2008
    Inventors: Edward M. Dowd, John J. Grunbeck
  • Patent number: 7433564
    Abstract: An optical phase modulator made of lithium niobate or the like phase-modulates the output light of a single-wavelength laser light source 20 that emits CW light, and the phase-modulated light is inputted to a dispersion medium 22. The positive chirp and negative chirp of light to which frequency chirp is applied by phase modulation draw near in the dispersion medium and an optical pulse is generated.
    Type: Grant
    Filed: May 25, 2004
    Date of Patent: October 7, 2008
    Assignee: Fujitsu Limited
    Inventors: Fumio Futami, Shigeki Watanabe
  • Patent number: 7433565
    Abstract: The invention relates to side-scattering light guides that generally comprise a core of transparent optically homogenous material seeded with diffuser particles. The light guide also comprises an optically transmitting sheath, having a lower refractive index than the core, surrounding and in contact with the sides of the core to prevent any light being transmitted along the core from escaping through the core's sides. In general, the diffuser particles impart only a small deviation to light rays incident upon them, and are distributed to scatter light being transmitted along the core so that at least some of the scattered light exits the sides of the core. A diffusing jacket is arranged to intercept scattered light exiting the sides of the core.
    Type: Grant
    Filed: September 8, 2003
    Date of Patent: October 7, 2008
    Assignee: Poly Optics Australia Pty
    Inventors: Edmond Kenneth Joseph, James Bruce Franklin, Geoffrey Burton Smith
  • Publication number: 20080232749
    Abstract: An optical fiber cable maintains an outer jacket, at least one optical fiber tube within the jacket and for each optical fiber tube, four optical fibers, arranged in a substantially squared arrangement. The optical fibers are linearly arranged along the length of the cable. The optical fibers are loosely arranged within the fiber tube in such a manner as to allow shifting of the straight optical fibers to conform to a bending of the cable, while being simultaneously constrained such that the straight arranged fibers do not become crossed-over or overlapped during bending.
    Type: Application
    Filed: August 14, 2007
    Publication date: September 25, 2008
    Inventors: Jeff Rosenquist, David Keller
  • Publication number: 20080219627
    Abstract: A fiber optic cable can inhibit water, that may inadvertently enter the cable, from damaging the cable's optical fibers. The fiber optic cable can comprise a buffer tube defining an interior volume extending along the fiber optic cable. Optical fibers can be disposed in the interior volume of the buffer tube, along with water-swellable materials, such as tapes and yarns. The interior volume can be dry or free from water-blocking gels or fluids. The water-swellable materials can provide the fiber optic cable with an unexpected level of protection from seawater. The water-swellable materials can, for example, limit flow of seawater along the interior volume. In an exemplary embodiment, progression of seawater in the interior volume be limited to three meters or less for a twenty four hour test period during which the seawater is under about one meter of head pressure.
    Type: Application
    Filed: March 7, 2008
    Publication date: September 11, 2008
    Applicant: Superior Essex communications LP
    Inventors: James J. Puzan, Christopher W. McNutt, Jeffrey S. Laws