Patents Examined by Stewart Levy
  • Patent number: 4149772
    Abstract: An optical fibre has a core and a plurality of rings surrounding the core. In one arrangement the core and subsequent alternate rings are light transmitting, while the intermediate rings are of cladding material. In an alternative arrangement the core and alternate rings are of cladding material and intermediate rings are light transmitting. The light transmitting rings can be of varying refractive index or of constant refractive index.
    Type: Grant
    Filed: November 28, 1977
    Date of Patent: April 17, 1979
    Assignee: Northern Electric Company Limited
    Inventors: Rama Iyengar, Felix P. Kapron
  • Patent number: 4148558
    Abstract: An optical by-pass relay for use with an optical transmission line wherein transmitted optical energy is focused on a light detector for conversion into an electrical signal which electrical signal is coupled to a utilization device. A light emitter coupled to the utilization device, transmits lights onto the transmission line to thereby place the utilization device into the optical transmission line. Means are provided for displacing the detector and emitter from the optical path of the transmission line and for positioning an optical coupler such as a glass rod into the optical path to thereby by-pass the utilization device while providing continuity to the optical signal traversing the optical transmission line.
    Type: Grant
    Filed: October 17, 1977
    Date of Patent: April 10, 1979
    Assignee: NCR Corporation
    Inventor: David B. Schuck
  • Patent number: 4148556
    Abstract: Disclosed is a solid state apparatus for and a method of (1) modulating the intensity of a multimode light beam; (2) coupling the light beam to an input optic fiber that is butt coupled to a diffraction grating that is formed of a plurality of stripe domains in a magnetic film; (3) altering, by the application of suitable magnetic fields, the angular orientation of the stripe domains in the plane of the magnetic film, and (4) multiplexing the diffracted light beam to a selected one of a plurality of several output optic fibers. The apparatus uses a liquid-phase epitaxially (LPE) grown film of bismuth substituted rare earth iron garnet to form a magnetizable layer in which stripe domains may be generated, sustained and moved about. The stripe domains form a diffraction grating. The angular orientation of the stripe domains in the plane of the diffraction grating may be altered by the application of external magnetic fields -- see the E. J. Torok, et al, U.S. Pat. No.
    Type: Grant
    Filed: December 27, 1977
    Date of Patent: April 10, 1979
    Assignee: Sperry Rand Corporation
    Inventors: Gerald F. Sauter, Roger W. Honebrink
  • Patent number: 4148559
    Abstract: A device for connecting optical fibres comprises two identical units fitted to the respective ends to be joined. Each unit has an alinement structure in which the end portion of the fibre is held resiliently by a bend in the fibre leading to the clamp. The units are mated with their alinement structures alined and face to face with their respective fibre end portions meeting end to end substantially half way along the alinement structures.
    Type: Grant
    Filed: September 30, 1977
    Date of Patent: April 10, 1979
    Assignee: Societe Anonyme Dite: Les Cables de Lyon
    Inventor: Francis Gauthier
  • Patent number: 4148560
    Abstract: In an optical cable comprising at least one optical bundle, individual fibres of the or each optical bundle and/or at least two fibre-groups each comprising an assembly of some of the fibres of the or each optical bundle being wholly or partially embedded in and mutually separated by encapsulating material throughout substantially the whole length of the bundle; at least one separate elongate non-optical reinforcing member; and, surrounding the bundle or bundles and the reinforcing member or members, an outer protective sheath, the or each optical bundle is loosely housed in a bore in the protective sheath, the or each reinforcing member is embedded in the sheath alongside the bore, each optical fibre has a continuous abrasion-resistant coating of a hardened material and the encapsulating material is of such a nature that, when appropriately treated, it can be removed from between the embedded fibres and/or the embedded fibre-groups at an end part of the cable or it can be softened to such an extent as to per
    Type: Grant
    Filed: July 7, 1977
    Date of Patent: April 10, 1979
    Assignee: BICC Limited
    Inventor: David S. Margolis
  • Patent number: 4147404
    Abstract: A dielectric optical waveguide joint in which first and second dielectric optical waveguides are located end to end in a groove in a plate of non-ductile material. The dielectric optical waveguides are retained in the groove by a mass of ductile material which has been formed so as to flow into intimate contact with the plate and the first and second waveguides. The invention also provides a method of forming a waveguide joint.
    Type: Grant
    Filed: February 2, 1978
    Date of Patent: April 3, 1979
    Assignee: The Post Office
    Inventor: Paul C. Hensel
  • Patent number: 4147405
    Abstract: Axial alignment of a pair of articles such as the ends of a pair of optical components is effected by an alignment device, which serves also as a connector. The alignment device employs a pair of sleeves, for holding the pair of articles, the sleeves being slidably and rotatably mounted in a pair of hingeably connected members. A pair of adjustment means disposed between the hinged members are used to move one of the members about the other member until the pair of articles are in axial alignment. An additional means is also included for locking the adjacent surfaces of the axially aligned pair of articles in a fixed position. Two embodiments of the device are disclosed.
    Type: Grant
    Filed: November 28, 1977
    Date of Patent: April 3, 1979
    Assignee: Western Electric Co., Inc.
    Inventor: Carroll D. Spainhour
  • Patent number: 4146302
    Abstract: This invention is a fibre optic communication cable in which the signals are transmitted by light. The glass fibres used for the cable are protected from breaking strain and from excessively sharp bends by supporting helically wound optic fibres on the inside of a tension element with provision by which the diameters of the helical convolutions can become smaller to increase the axial length component of the optic fibres when the a axial length of the tube is increased by forces that strain the tube. Several ways of maintaining the helically wrapped optic fibres supported from the tube so as to permit decrease in the diameter of the helix are described and illustrated.
    Type: Grant
    Filed: June 28, 1977
    Date of Patent: March 27, 1979
    Assignee: General Cable Corporation
    Inventor: Ludwik Jachimowicz
  • Patent number: 4146297
    Abstract: An integrated optical filter composed of coupled nonidentical strip waveguides in LiNbO.sub.3 is disclosed. The device has a broad bandwidth, is tunable over several hundred angstroms, and offers electrical control of the crossover efficiency. Several devices are combined on a single substrate to provide an electrically tunable multiplexer or demultiplexer.
    Type: Grant
    Filed: January 16, 1978
    Date of Patent: March 27, 1979
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: Rodney C. Alferness, Ronald V. Schmidt
  • Patent number: 4146301
    Abstract: Splicing of two mating optical fiber ribbons is achieved with a connector comprising a multigrooved substrate with vacuum slots normal to the fiber-receiving grooves and a mating cover. Air drawn through the vacuum slots during the splicing operation holds the exposed ribbon fibers in the grooves to ensure transverse alignment of the fibers for splicing. The cover mounts onto the substrate to lock the fibers in place after they have been axially aligned and abutted. Slots in the cover allow venting to prevent suction buildup under the cover.
    Type: Grant
    Filed: May 25, 1977
    Date of Patent: March 27, 1979
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: Allen H. Cherin, Anthony Osborne
  • Patent number: 4145109
    Abstract: A method and apparatus is described for multimode electro-optic multiplexing which provides high interchannel isolation. This isolation is achieved by utilizing voltage induced optical barriers to channelize optical signals and may be increased by positioning spoiler electrodes, which are energized with the channel barrier electrode, in each channel. These spoiler electrodes establish a varying refractive index in the median which deflects optical signals from the output port of the channel, thus providing the increased isolation. The spoiler electrode concept is also employed to provide a non-guided optical multiplexer/demultiplexer.
    Type: Grant
    Filed: May 12, 1977
    Date of Patent: March 20, 1979
    Assignee: Sperry Rand Corporation
    Inventor: Arthur R. Nelson
  • Patent number: 4143942
    Abstract: A fiber optic cable and method of making same are disclosed wherein one or more fiber optic elements are carried along the length of an elongate strength member, a tape is applied coaxially over the fiber optic elements and elongate strength member to establish a cable core, and a protective jacket is disposed coaxially over the cable core. The tape maintains the fiber optic elements and elongate strength member in assembled relation, provides a heat barrier and facilitates stripping of the jacket without disturbing the cable core. A filler material may be interposed between the jacket and the taped cable core.
    Type: Grant
    Filed: October 26, 1976
    Date of Patent: March 13, 1979
    Assignee: Belden Corporation
    Inventor: Gene S. Anderson
  • Patent number: 4143939
    Abstract: The invention concerns the magneto-optical deflectors which enable an incident beam of radiant energy to be deflected in a variable manner under the control of a magnetic field. It consists in using a thin film of a magnetic material forming a diffraction grating, means for travelling the incident beam along the plane of this thin film, and means for magnetically controlling the step-width of the grating, thus controlling the angle of deflection given by this grating.
    Type: Grant
    Filed: June 28, 1977
    Date of Patent: March 13, 1979
    Assignee: Thomson-CSF
    Inventors: Bernard Desormiere, Georges Hepner, Jean-Paul Castera
  • Patent number: 4142776
    Abstract: Two groups of optical communications fibers are optically joined within a single cartridge that receives and abuts two optical fiber ribbon end arrays. A two-piece connector consisting of a substrate with fiber-receiving grooves and a mating cover houses the fibers. In turn two such connectors are contained within the cartridge, either in a tight fit requiring no retaining means or a loose fit requiring set screws to retain the two connectors in abutting relation. Variations of the basic hardware provide both a rearrangeable splice and a permanent splice. Several cartridges may be housed in a fixture to accommodate the several layers of a multi-layer optical fiber ribbon cable.
    Type: Grant
    Filed: September 20, 1976
    Date of Patent: March 6, 1979
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: Allen H. Cherin, Anthony Osborne
  • Patent number: 4142775
    Abstract: Optical signal processing devices, primarily intended for use in integrated optical communication systems, include 3 dB coupled strip guide directional couplers. Each coupler is formed in a body of electrooptic material and includes electrodes bracketing at least one of the guides in the coupled region. Each coupler is fabricated so as to be overcoupled (i.e., greater than 3 dB coupling) when the coupling is synchronous. Voltage bias, supplied to the electrodes of each coupler, produces sufficient asynchronism to independently adjust each coupler to the desired 3 dB coupling condition. Permutation switches are produced by including a switchable phase shifter between two couplers. Channel drop filters are produced by including reflection gratings between two couplers. Differential phase detectors, for a pulse code modulation system, are produced by including a selected path length difference between the two strip guides connecting two couplers.
    Type: Grant
    Filed: September 27, 1976
    Date of Patent: March 6, 1979
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: Vellayan Ramaswamy, Robert D. Standley
  • Patent number: 4141623
    Abstract: A multiple optical fibre cable in which the fibres can be used separately for long distance signal transmission comprises a central core round which the optical conductors are concentically disposed. Each optical conductor is constituted by an optical fibre protected by a first layer or covering of polyamide and a second layer or sheath of polyethylene. In order to avoid distortion of the optical fibre, the second layer or sheath is stretched. Application: Optical telecommunications cables.
    Type: Grant
    Filed: May 13, 1977
    Date of Patent: February 27, 1979
    Assignee: Societe Anonyme dite: Les Cables de Lyon
    Inventors: Rene Dubost, Bernard Grenat
  • Patent number: 4140366
    Abstract: An assembly for use in a fiber optic connector for aligning and spacing the terminal ends of a pair of fiber optic cables to achieve efficient light transfer includes a pair of terminal pins, each having a bore for receiving one of the cables and an external shoulder. A resilient sleeve is tightly received over the terminal pins to align the terminal ends in facing relation and abuts the terminal pin shoulders to effect a predetermined close spacing of the terminal ends to provide efficient light transfer between the pair of fiber optic cables.In a preferred form, each terminal pin includes an insert member which has a concentric channel for receiving and aligning one of the fiber optic cables concentric with the outer dimension of the terminal pin.
    Type: Grant
    Filed: April 19, 1977
    Date of Patent: February 20, 1979
    Assignee: Bunker Ramo Corporation
    Inventors: John A. Makuch, Henry R. Fredlund, Jr.
  • Patent number: 4140367
    Abstract: A connector assembly for coupling one or more pairs of fiber optic tubing cable segments comprises a mating plug and receptacle each including insert members having aligned passageways wherein the terminal ends of the fiber optic cable segments are disposed. An alignment sleeve within the passageways fixed to one insert member and slidably received by the other receives the terminal ends at respective ends of the fiber optic cable segments of the sleeve to maintain the terminal ends in axial, transverse and angular alignment.
    Type: Grant
    Filed: April 19, 1977
    Date of Patent: February 20, 1979
    Assignee: Bunker Ramo Corporation
    Inventors: John A. Makuch, Melvin Gordon
  • Patent number: 4138194
    Abstract: Light-transmitting optical fiber having a core of a deuterated acrylate polymer exhibits remarkably high transmission of light in the visible and at certain wavelengths in the near-infrared region of the spectrum.
    Type: Grant
    Filed: October 14, 1977
    Date of Patent: February 6, 1979
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: John K. Beasley, Richard Beckerbauer, Henry M. Schleinitz, Frank C. Wilson
  • Patent number: 4135781
    Abstract: An optical fiber termination in which a plastic clad optical fiber is pushed into a heated ferrule containing a pierced watch bearing jewel so as to force the bare fiber through the aperture in the jewel. The protruding fiber end is then fused and polished flush with the jewel whereby the fiber end is centered within the jewel aperture.
    Type: Grant
    Filed: May 23, 1977
    Date of Patent: January 23, 1979
    Assignee: International Standard Electric Corporation
    Inventor: John D. Archer