Patents Examined by John Ngo
  • Patent number: 5982971
    Abstract: A "floating" fiber storage assembly is provided for use with a fiber-optic cable joint that connects two or more cables. The device includes a fiber storage tray for storing the spliced optic fibers of the cables, although any fiber storage device (such as a cylinder) may be used. The fiber storage tray has a locking end with a connection interface, comprised of one or more locking cut-outs and locking tabs, for slidably engaging a terminating socket assembly. When the connection interface is slidably engaged with the terminating socket assembly, the fiber storage tray is loosely connected to the terminating socket assembly. To prevent the fiber storage tray and the terminating socket assembly from easily disengaging, a locking band may engage a substantially continuous locking groove formed when the storage tray and the socket assembly are loosely connected.
    Type: Grant
    Filed: October 10, 1996
    Date of Patent: November 9, 1999
    Assignee: Tyco Submarine Systems Ltd.
    Inventor: Mohamad A. Amirkalali
  • Patent number: 5926588
    Abstract: An optical switch of the present invention comprises an optical fiber arranging member in which tip ends of a plurality of first optical fibers are juxtaposed, a movable arm facing the optical fiber arranging member and fixing a tip end of a second optical fiber, and a drive mechanism For driving at least one of the optical fiber arranging member and the movable arm, for switching of optical connection, in an arrangement direction of the first optical fibers and in a direction perpendicular to the arrangement direction of the first optical fibers to optically couple the second optical fiber with the first optical fiber, wherein the optical fiber arranging member and the movable arm are encased in a sealing case and wherein an antireflection agent is filled in the sealing case.
    Type: Grant
    Filed: August 21, 1995
    Date of Patent: July 20, 1999
    Assignees: Sumitomo Electric Industries Ltd, Nippon Telegraph & Telephone Corporation
    Inventors: Takashi Murakami, Tsutomu Watanabe, Kazumasa Ozawa, Hisao Maki, Kazuhito Saito, Nobuo Tomita
  • Patent number: 5905831
    Abstract: An apparatus for coupling an optical fiber to an optical device comprises a substrate and a passive alignment member. The substrate having a top surface and a bottom surface. The top surface having a fist groove disposed thereon for holding an optical fiber, and a second groove disposed on the top surface. The second groove being substantially orthogonal to the first groove. The passive alignment member disposed in the second groove. The passive alignment member having selectively etched forward and side pedestals for aligning the optical device to the optical fiber disposed in the first groove.
    Type: Grant
    Filed: June 28, 1996
    Date of Patent: May 18, 1999
    Assignee: The Whitaker Corporation
    Inventors: Robert Addison Boudreau, Terry Patrick Bowen, Hongtao Han
  • Patent number: 5903696
    Abstract: The invention describes two types of multimode optical waveguides having special dip in the refractive index profile of their core providing conditions for propagation of a higher order mode with sharp central peak which field carries considerable part of the mode energy, while the fields of all other modes in the waveguide are mostly concentrated outside of this central peak region. The waveguide of the first type guides the mode only with one central peak while the mode in the waveguide of the second type has also an additional peak at the interface between the waveguide core and cladding providing a possibility to detect any influence on the mode field in its outer region by measuring the signal in the central peak of the mode.
    Type: Grant
    Filed: May 29, 1997
    Date of Patent: May 11, 1999
    Assignee: CeramOptec Industries Inc
    Inventor: Sergej G. Krivoshlykov
  • Patent number: 5894537
    Abstract: A single-mode optical waveguide fiber designed to limit power penalty due to four wave mixing and a method of making the waveguide is disclosed. Variations in properties, e.g., radius or refractive index, of the waveguide fiber core provide a total dispersion which varies along the length of the waveguide. The algebraic sum of products of length times total dispersion is controlled to a pre-selected value for each waveguide fiber which makes up a system link. Proper choice of total dispersion variation magnitude and sub-length results in a system link wherein a signal travels only short distances in waveguide portions having total dispersion near zero. However, the variation of the total dispersion provides a system link which has a pre-selected dispersive effect on the signal over a selected wavelength range. The dispersive effect on the signal can be chosen to be essentially zero. A number of techniques for fabricating DM fiber are also disclosed.
    Type: Grant
    Filed: January 11, 1996
    Date of Patent: April 13, 1999
    Assignee: Corning Incorporated
    Inventors: George E. Berkey, Venkata A. Bhagavatula, Peter C. Jones, Donald B. Keck, Yanming Liu, Robert A. Modavis, Alan J. Morrow, Mark A. Newhouse, Daniel A. Nolan
  • Patent number: 5892875
    Abstract: A filtering connection to optical light cable is a body having a hollow bore extending through the body, with a single or multicomponented optical element positioned coaxially in the hollow bore. An interior threaded portion with a standard thread is formed at one end of the hollow bore while an exterior threaded portion with a mating standard thread is formed about the other opposite end of the hollow bore.
    Type: Grant
    Filed: December 31, 1996
    Date of Patent: April 6, 1999
    Inventor: Avigdor M. Ronn
  • Patent number: 5867621
    Abstract: An adapter is provided for operatively mating two optical fiber connectors of the type that are aligned relative to each other by guide pins. The adapter has two sleeve body halves that are joined together at a mating ends. A guide pin mount is captured between the two sleeve body halves that defines an opening to allow abutment of the two connectors therethrough. Two guide pins mounted on the guide pin mount parallel with the passageway defined through the sleeve and located so as to engage the guide pin holes on the connectors and align two connectors inserted into the adapter.
    Type: Grant
    Filed: April 23, 1997
    Date of Patent: February 2, 1999
    Assignee: Siecor Corporation
    Inventors: James P. Luther, Terry L. Cooke, Dennis M. Knecht, Joel C. Rosson, Markus A. Giebel, David L. Dean
  • Patent number: 5859939
    Abstract: A polarization beam splitter separates the optical data signal into first and second orthogonally polarized optical signals. A first variable time delay element provides a first incremental propagation delay for the first polarized optical signal. A second variable time delay element provides a second incremental propagation delay for the second polarized optical signal. The first and second variable time delay elements consist of a series of optical switches optically interconnected by different incremental lengths of optical fiber. For example, 2.times.2 optical switches are provided for switching between a reference fiber segment and a respective delay fiber segment to provide a relative incremental propagation delay. A controller controls optical switches in the first and second variable switching delay elements to set first and second incremental propagation delays.
    Type: Grant
    Filed: February 25, 1997
    Date of Patent: January 12, 1999
    Assignee: MCI Communications Corporation
    Inventors: John Fee, Niall Robinson
  • Patent number: 5850494
    Abstract: A device is disclosed for safely holding, organizing and sequencing optical fibers by which a connector may be placed on the end of fiber optics cable in a manner that is reliable and efficient. The device passively holding optical fiber strands securely an in an organized manner for preparing connection to the connector. The device includes a support member having a rubber member disposed on a top surface thereof. The rubber member includes a plurality of slits, each of which holding an individual fiber strand or ribbon. A color indicator can also be provided with each slit to indicate the corresponding color strand or ribbon to be disposed within the slit. The device can also include left and right wing member pivotally attached to each end of the support member. The wing members can also include similar rubber members having slits and associated color indicators.
    Type: Grant
    Filed: June 27, 1996
    Date of Patent: December 15, 1998
    Inventor: Dennis R. O'Dell
  • Patent number: 5845022
    Abstract: An improved waveguide grating router occupies less physical volume than prior-art designs, and provides a spectral response with substantially one dominant passband, by providing nonlinearly-changing angles between the central axis of a waveguide coupler and each of a plurality of waveguide arms, and by providing waveguide arms having nonlinearly-changing lengths. The router includes a first waveguide coupler, a second waveguide coupler, and a plurality of M waveguides coupled between the first and second waveguide couplers. Each waveguide m has a length L(m) and forms an angle .alpha.(m) with respect to the central axis of the second waveguide coupler. The difference in angle (.DELTA..alpha.) between any two adjacent waveguides, m and (m-1) is equal to an arbitrary constant j plus (B*m) for each of the waveguides. The difference in length (.DELTA.L) between any two adjacent waveguides, m and (m-1), is equal to an arbitrary constant k plus (A*m) for each of the waveguides.
    Type: Grant
    Filed: February 14, 1997
    Date of Patent: December 1, 1998
    Inventor: Christopher Richard Doerr
  • Patent number: 5841919
    Abstract: An optical wavelength multiplexer/demultiplexer has an input channel waveguide for receiving a wavelength division multiplexed signal, a first slab waveguide having an input boundary and a fan-shaped output boundary, an arrayed-waveguide grating comprising N channel waveguides, which provides a predetermined waveguide length difference from each other, a second slab waveguide having a fan-shaped input boundary and an output boundary, N output channel waveguides for each receiving a demultiplexed optical signals having a desired wavelength .lambda.1, .lambda.2, . . . or .lambda.n. The channel waveguides of the arrayed-waveguide grating are arranged along the fan-shaped output boundary of the first slab waveguide such that an angle .theta. between the central axis of "i"th (i=1, 2, . . . N) channel waveguide and the symmetric axis of the fan-shaped output boundary of the first slab waveguide 4 satisfies the certain equations.
    Type: Grant
    Filed: February 28, 1997
    Date of Patent: November 24, 1998
    Assignee: Hitachi Cable, Ltd.
    Inventors: Kenji Akiba, Morihiko Ikegaya
  • Patent number: 5838848
    Abstract: An N.times.N wavelength router (1) includes n m.times.m couplers (10, 15, 20, 25), N being equal to n.times.m, and the N inputs (11, 12, 16, 17, 21, 22, 26, 27) of the couplers being the inputs (E1-E8) of the N.times.N router. The N.times.N router also includes m n.times.n routers (30, 40) capable of switching an optical signal having a wavelength, from any one of its n inputs (31-34, 41-44) to any one of its n outputs (35-38, 45-48), according to the wavelength of the signal. The inputs of the n.times.n routers are connected to the outputs of the m.times.m couplers, and the outputs of the n.times.n routers are the outputs (S1-S8) of the N.times.N routers. The transmission spectra of the n.times.n routers have the form of a series of peaks, each of the series being different one from another.
    Type: Grant
    Filed: January 8, 1997
    Date of Patent: November 17, 1998
    Assignee: Instruments, S.A.
    Inventor: Jean-Pierre Laude
  • Patent number: 5838853
    Abstract: An optical waveguide having stable low branching ratio is disclosed, which includes a primary optical waveguide portion coupled at a input end thereof to an input-side optical fiber. branched optical waveguide portions each having one end continuously connected to a output end of the primary optical waveguide portion and the other ends coupled to a plurality of output-side optical fibers and an introductory waveguide portion coupled to the input end of the primary optical waveguide portion and having a width substantially identical with a core diameter of the input-side optical fiber. Further, there is provided a method of producing an optical branching device in which the optical waveguide is formed.
    Type: Grant
    Filed: January 7, 1997
    Date of Patent: November 17, 1998
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Kuniaki Jinnai, Yasunari Kawabata, Norio Takeda
  • Patent number: 5838849
    Abstract: An optical waveguide having a light receiving end and a propagation mode with a double-hump shaped optical field distribution at the light receiving end to receive light into the optical waveguide. The light incident on the light receiving end typically has a single-hump shaped optical field distribution. Overlap in the optical field distribution of the incident light and the optical field distribution of the propagation mode of the optical waveguide causes the light to be received by the optical waveguide. Alternatively, the optical waveguide can have a propagation mode with a single-hump shaped optical field distribution at the light receiving end, and the incident light can have a double-hump shaped optical field distribution at the light receiving end.
    Type: Grant
    Filed: February 21, 1997
    Date of Patent: November 17, 1998
    Assignee: Fujitsu Limited
    Inventor: Masataka Shirasaki
  • Patent number: 5838851
    Abstract: Both recursive and non-recursive fiber-optic loop elements are cascaded to form various fiber-optic lattice configurations to form a fiber-optic signal processor for use in wideband applications capable of processing radio frequency (RF) signals. Each fiber-optic loop element includes a fiber-optic element, such as a monomode optical fiber or a monomode optical waveguide formed in a loop by way of a fiber-optic coupling device and one or more reflection mechanisms, such as a Bragg grating. In order to provide increased flexibility, the present invention allows the reflectivities of the reflection elements to be selected to provide additional flexibility in creating the frequency response characteristics of an optical signal processor.
    Type: Grant
    Filed: June 24, 1996
    Date of Patent: November 17, 1998
    Assignee: TRW Inc.
    Inventors: Philip Henry Wisseman, Chung-Ching Shih
  • Patent number: 5835659
    Abstract: The present invention aims to prevent formation of defect or break-off at ridges of fixing grooves of optical fiber-fixing substrates, when an optical fiber is received in the fixing groove or when an end surface of the substrate is polished by a grinding work. For that purpose, the ridges of the fixing grooves of the substrate have a curvature of radius of not less than 5 .mu.m over the entire portion of the ridges viewed in the lateral cross-sectional view of the fixing grooves. Preferably, the bottoms of the fixing grooves of the substrate have a curvature of radius of not more than 5 .mu.m viewed in the lateral cross-sectional view of the fixing groove. The fixing grooves may be produced by press forming.
    Type: Grant
    Filed: February 16, 1996
    Date of Patent: November 10, 1998
    Assignee: NGK Insulators, Ltd.
    Inventors: Takashi Ota, Masashi Fukuyama, Yukio Aisaka
  • Patent number: 5835660
    Abstract: In an optical fibre clamping device to prevent relative movement between an optical fibre and a tube within which the optical fibre is located, a body part includes a through passageway to receive the optical fibre. The body part includes a first clamp to engage the tube and a second clamp to engage the optical fibre.
    Type: Grant
    Filed: April 1, 1996
    Date of Patent: November 10, 1998
    Assignee: GPT Limited
    Inventors: Roger Erwin Jung, Brian Gregory, Peter David Jenkins, Simon Charles Triston Benton
  • Patent number: 5835652
    Abstract: Disclosed is an improved optical fiber cable connector having at least one pair of ramp projections inclined inward to engage an optical fiber cable for preventing removal of the cable from the connector by a pulling force applied to the cable.
    Type: Grant
    Filed: September 27, 1996
    Date of Patent: November 10, 1998
    Assignee: Molex Incorporated
    Inventors: Masonori Yagi, Hiroyuki Fujii
  • Patent number: 5835646
    Abstract: An active optical circuit sheet or active optical circuit board wherein an electro optical switch or optical modulator is driven with a voltage (SIGin) from an electronic device, the electrical signal (SIGin) is converted to an optical signal, transmitted and then converted to an electrical signal (SIGout) at an optical receiver element, and an electrical connection is formed between an optical wiring board and the electronic device for transmission of signals to another or the same electronic device, separating the electrical wiring at the electronic device end and the optical wiring at the optical wiring board end, or alternatively, SIGin and SIGout electrode pads are provided on the side of the optical wiring board on which the optical device is mounted or on the opposite side, for connection with the electronic device.
    Type: Grant
    Filed: August 9, 1996
    Date of Patent: November 10, 1998
    Assignee: Fujitsu Limited
    Inventors: Tetsuzo Yoshimura, Wataru Sotoyama, Takeshi Ishitsuka, Koji Tsukamoto, Shigenori Aoki, Satoshi Tatsuura, Katsusada Motoyoshi, Yasuhiro Yoneda
  • Patent number: 5832150
    Abstract: A fiber optic coupler for coupling an asymmetrical beam such as provided by a laser diode into a fiber optic cable. The coupler comprises at least one fiber optic cable having a longitudinally-formed approximately flat entrance facet and a cylindrical curved reflective surface formed on a first end. The curved reflective surface defines a line focus proximate to the entrance facet. A support structure situates the entrance facet proximate to the laser diode so that the line focus is approximately aligned with the narrow output aperture of the laser diode. The fiber optic cable may have any cross-section, such as circular, rectangular, or square. The fiber optic cable also includes a main body for receiving and transmitting the coupled laser radiation, and an output end having an approximately flat exit facet for outputting the laser radiation.
    Type: Grant
    Filed: July 8, 1996
    Date of Patent: November 3, 1998
    Assignee: Laser Power Corporation
    Inventor: Graham W. Flint