Patents Examined by Stewart Levy
  • Patent number: 4116532
    Abstract: An optical fiber coupling assembly is mounted on the back of a repeater module so that when the repeater is slid into a rack near which an optical fiber frame plug is mounted, the optical fibers of the frame plug are laterally captured at an orientation angle by tapered grooves in an alignment receptacle of the coupling assembly and progressively urged so as to be precisely positioned near repeater optical fibers or semiconductor devices. A spring loaded construction automatically decreases the orientation angle to zero so that the fibers rest in the whole length of the grooves. The assembly additionally slides the fibers relative to the grooves and into abutment with the fibers or devices to which they are being coupled.
    Type: Grant
    Filed: January 5, 1977
    Date of Patent: September 26, 1978
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: William Marshall Hubbard, Willis Martin Muska
  • Patent number: 4114981
    Abstract: An optical fiber for communication comprises an optical fiber covered with a coating of a high-molecular elastomer having a flexural modulus of not less than 200 kg/cm.sup.2 at room temperature, the difference between the flexural moduli of said elastomer at room temperature and about -50.degree. C being not more than 1000 kg/cm.sup.2.
    Type: Grant
    Filed: May 16, 1977
    Date of Patent: September 19, 1978
    Assignees: Nippon Telegraph and Telephone Public Corporation, The Fujikura Cable Works, Ltd.
    Inventors: Yukinori Ishida, Moriaki Kojima, Toshiaki Kobayashi, Yasuyuki Sugawara
  • Patent number: 4113348
    Abstract: A method of making illuminating sheets for microfiche readers. The illuminating sheet includes light conducting channels in a base or carrier having low creepage and low coefficients of thermal and of humidity expansion which terminate at different points accurately located over the surface of the sheet. The channel termini have mirrors which reflect light and thereby illuminate microimages on a microfiche. The method includes embossing elongated channels of different lengths onto a transparent, plastic sheet by means of an embossing roll. The roll carries spaced discs, the discs having peripheries of different lengths to thereby form channels of different lengths. The channels are then filled.
    Type: Grant
    Filed: August 13, 1976
    Date of Patent: September 12, 1978
    Assignee: Izon Corporation
    Inventor: George J. Yevick
  • Patent number: 4113347
    Abstract: An arrangement for directional radiation of light in symbol-indicator systems which are to be effective over fairly large distances, with the symbols being formed by dots of a dot matrix which receive light from respective light conductor bundles, particularly for utilization as additional indicators in the railroad signalling field, in which each matrix dot is provided with a lens arrangement comprising two horizontally adjacent lenses having their plane surfaces facing the illuminating light conductors with the two lenses being cooperatively disposed to reproduce two horizontally adjacent partially superimposed light sources in the plane of observation.
    Type: Grant
    Filed: March 28, 1977
    Date of Patent: September 12, 1978
    Assignee: Siemens Aktiengesellschaft
    Inventor: Waldemar Gaertner
  • Patent number: 4111523
    Abstract: It is known to form an optical waveguiding thin film on a substrate. For various practical reasons, it is often desired that an optical beam coupled to the film be laterally confined so as to propagate only in a longitudinal stripe portion of the film. As disclosed herein, this is accomplished by depositing spaced-apart elements in contact with one surface of the film to establish in a narrow longitudinal region of the film between the elements an effective index of refraction that is higher than the index of the remainder of the film. In this way a longitudinal waveguiding stripe is formed on the film without the necessity of irradiating, etching or otherwise directly treating the film itself.
    Type: Grant
    Filed: August 3, 1976
    Date of Patent: September 5, 1978
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: Ivan Paul Kaminow, Herwig Werner Kogelnik
  • Patent number: 4111524
    Abstract: A multiplexer/demultiplexer for optical fibers is disclosed that features a reflection diffraction grating and a graded refractive index rod in a rugged, compact assembly having low insertion loss and low crosstalk.
    Type: Grant
    Filed: April 14, 1977
    Date of Patent: September 5, 1978
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: Walter John Tomlinson, III
  • Patent number: 4111520
    Abstract: Optical waveguides are fabricated by heating a region of a body of optical material with an energy beam. The region is locally heated to a temperature at which plastic deformation occurs as a result of the constraints placed by the unheated adjacent material. The plastic strain produced at high temperature translates into a residual stress as the material cools which results in a greater index of refraction within the region than in surrounding regions.
    Type: Grant
    Filed: January 13, 1975
    Date of Patent: September 5, 1978
    Assignee: Honeywell Inc.
    Inventor: Enrique Bernal G.
  • Patent number: 4111521
    Abstract: A semiconductor device which utilizes interferometric principles and electrical control to provide either light reflection or light transmission or partial light reflection/transmission. In a preferred embodiment, the device includes an input waveguide which divides into branch waveguides, with the branch waveguides being reunited at an output waveguide. When the optical path lengths of the branched waveguides varies by an integer multiple of the light wavelength in the guides, the light waves interfere constructively at the output waveguide causing light to be transmitted into the output waveguide. When the light wave in one branch waveguide undergoes a single pass phase shift of 180.degree. relative to the light wave in the other branch waveguide, the light waves interfere at the output waveguide and are caused to return to the input waveguide through the branch waveguides. The returning light wave in the one branch waveguide once again experiences a single pass 180.degree.
    Type: Grant
    Filed: January 21, 1977
    Date of Patent: September 5, 1978
    Assignee: Xerox Corporation
    Inventors: William Streifer, Donald R. Scifres, Robert D. Burnham
  • Patent number: 4109997
    Abstract: Optical slip rings which permit signals to be transferred from a rotating dy to a non-rotating body without any physical contact. Fiber optic bundles are utilized to conduct light signals on one body to separate fiber optic bundles on the other body. Light is projected across a small gap from the rotating bundle to the non-rotating bundle. Other variations use multiple channels, wave guides, derotating prisms and concentric annular mirrors to achieve signal transfer. The optical slip rings can transfer any signal which may be converted to a light signal.
    Type: Grant
    Filed: February 28, 1977
    Date of Patent: August 29, 1978
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Myren L. Iverson
  • Patent number: 4109994
    Abstract: A connector for coupling a plurality of pairs of single optical fibers is disclosed. A pair of optical fiber terminations abut in a V-groove. Each termination comprises a set of more than three cylinders closely packed side-by-side to provide a plurality of interstitial apertures therebetween into which single fibers are individually inserted. Because the two terminations are positioned in the V-groove, the fibers in one termination will be accurately aligned with corresponding fibers in the other termination.
    Type: Grant
    Filed: February 17, 1977
    Date of Patent: August 29, 1978
    Assignee: International Telephone and Telegraph Corporation
    Inventor: Martin Chown
  • Patent number: 4110001
    Abstract: This optical fiber cable has the optical fibers adhered to a support. An assembly including the fibers and the support is carried by a core element having a helical channel in which the fiber assembly is located and free to adjust itself to accommodate bending of the cable without subjecting the optical fibers to pressure or to bends that are excessively sharp. The construction also avoids pressure on the optical fibers from binders, core tapes, or the cable sheath when the cable is bent. It also avoids micro-bending losses. Locating of the optical fibers closer to the cable axis further decreases bending losses.
    Type: Grant
    Filed: January 5, 1977
    Date of Patent: August 29, 1978
    Assignee: General Cable Corporation
    Inventors: Jerzy A. Olszewski, Arnab Sarkar
  • Patent number: 4106849
    Abstract: A fiber optic bundle is placed through an object to be sealed. Ends of the fibers are spread and threaded through one another in a random dispersion, disorienting the fibers. Randomly reoriented ends are regathered and clamped. A moveable reticle at a light input termini of the fibers creates unique identifiable patterns at the output end of the fibers.
    Type: Grant
    Filed: October 18, 1976
    Date of Patent: August 15, 1978
    Inventor: Lorin R. Stieff
  • Patent number: 4105284
    Abstract: A low loss buffered optical waveguide fiber is described. An optical waveguide fiber is coated with a first layer of high modulus material applied to the exterior longitudinal surface thereof. Thereafter, a second layer of low modulus plastic material is disposed over the layer of high modulus material. The ratio R.sub.i /R.sub.o of the radii of the first and second applied layers is selected to minimize the microbending loss.
    Type: Grant
    Filed: May 10, 1976
    Date of Patent: August 8, 1978
    Assignee: Corning Glass Works
    Inventor: Robert Olshansky
  • Patent number: 4105283
    Abstract: It has been found that in a profiled optical waveguide for guiding a finite spectrum of light, reduction of total dispersion is possible by forming the overall profile in the waveguide as a composite of at least two profiles of different contour. The profiles contributing to the composite are formed for example through polarizability or density gradations in the waveguide.
    Type: Grant
    Filed: February 1, 1977
    Date of Patent: August 8, 1978
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: Detlef C. Gloge, Ivan P. Kaminow, Herman M. Presby
  • Patent number: 4105285
    Abstract: A single optical fiber connector in which a watch X-jewel is employed to align the two fibers to be coupled.
    Type: Grant
    Filed: March 11, 1977
    Date of Patent: August 8, 1978
    Assignee: International Standard Electric Corporation
    Inventors: Michael A. Bedgood, John S. Leach
  • Patent number: 4102561
    Abstract: An optical fiber connector comprising a first resilient member having elongated grooves in the surface thereof into which fibers to be optically connected are disposed end-to-end. A second resilient member is urged against that portion of the fibers opposite the first member, thereby causing a slight deformation of the second member and the groove forming walls. The substantial equilibrium of forces applied to each pair of fibers by the resilient members causes their axes to become aligned. A longitudinal force applied to each fiber urges the endface thereof into contact with the endface of the fiber that is to be connected thereto.
    Type: Grant
    Filed: July 2, 1975
    Date of Patent: July 25, 1978
    Assignee: Corning Glass Works
    Inventors: Robert M. Hawk, Frank L. Thiel
  • Patent number: 4102560
    Abstract: A pair of diffraction gratings are disposed between a fiber and a waveguide carried by a substrate. The gratings each have a common spatial frequency component that couples light between the fiber and the waveguide. Light from the gratings establish first and second components of an electromagnetic field that extend into the substrate. The gratings are constructed and positioned to cause the first and second components to be of substantially equal amplitude and opposite phase thereby inhibiting a coupling of light into the substrate.
    Type: Grant
    Filed: December 16, 1976
    Date of Patent: July 25, 1978
    Assignee: RCA Corporation
    Inventor: Arthur Miller
  • Patent number: 4101188
    Abstract: An optical magnifying device employing fiber optics. When functioning as a microscope, the object plane is defined by and divided into sub-areas by the input termini of many coherent fiber bundles. Each output terminal of each bundle is provided with an objective lens which projects onto an image plane. When used as a microfiche reader, a first magnifying stage is provided, and this (first) image is in turn further magnified in the same manner. Microfiche characters of 2 micron size may be resolved by the entire system.
    Type: Grant
    Filed: December 21, 1973
    Date of Patent: July 18, 1978
    Assignee: Izon Corporation
    Inventor: George J. Yevick
  • Patent number: 4099835
    Abstract: This application discloses a technique for producing optical fibers with longitudinal variations in index of refraction. The deposition apparatus is arranged to allow for the formation of an intertwined double helix of two different materials. The technique does not require imposing any time dependent conditions on the fabrication apparatus.
    Type: Grant
    Filed: October 8, 1976
    Date of Patent: July 11, 1978
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: William George French, John Burnette MacChesney
  • Patent number: 4097129
    Abstract: A device for coupling a pair of optical fibers is disclosed comprising a resiliently compressible body for holding a pair of opposing protectively jacketed fibers in end-to-end abutment within an oversized bore. The body is symmetrically compressed about its central portion to reduce the bore cross-section to a fiber-engaging dimension around the bare fiber tips thereby securely aligning the fibers. Similarly, the body is compressed about its end portions to decrease the bore cross-section to a jacket-clamping dimension whereby stresses in the spliced region are distributed along the fiber jacket.
    Type: Grant
    Filed: May 25, 1976
    Date of Patent: June 27, 1978
    Assignee: GTE Laboratories Incorporated
    Inventors: Charles K. Wellington, Mark L. Dakss