Patents Examined by George Wang
  • Patent number: 6549692
    Abstract: The position of a micro-mirror, for example, in an optical switch, may be monitored using an optical position control signals that are detected by a detector arrangement. The position of the micro-mirror may be adjusted by detecting the position of the beam spot and comparing the detected position to a desired position.
    Type: Grant
    Filed: February 13, 2001
    Date of Patent: April 15, 2003
    Assignee: Tellium, Inc.
    Inventors: Roey Harel, Nicolas H. Bonadeo, Igal Brener, James Walker
  • Patent number: 6546170
    Abstract: Asymmetric grating assisted couplers present unique problems if dispersion is to be reduced to levels at which high data rate signals can be transmitted. To overcome these problems, the method of the present invention includes precisely controlling and monitoring the cross-sectional geometry of the coupler during stretching and fusing. By monitoring states of polarization in lowest order modes as the coupler is formed, coupler fusion can be terminated when optimum form birefringence minimizing PMD is achieved. Dispersion is further minimized by impressing a saturated index of refraction grating with substantially flat add/drop characteristics in the coupler, and introducing a controlled amount of twist.
    Type: Grant
    Filed: March 6, 2001
    Date of Patent: April 8, 2003
    Assignee: Arroyo Optics, Inc.
    Inventors: Avishay Eyal, Anthony S. Kewitsch, George A. Rakuljic
  • Patent number: 6542650
    Abstract: Techniques and devices for emulating polarization-mode dispersion in an optical signal that transmits through an optical fiber by using multiple birefringent wave-guiding sections that are interconnected to have adjustable polarization-changing connectors. The polarization of light transmitting from one section to another adjacent section can be modified differently between different adjacent sections according to a distribution function to produce one PMD state to represent one possible PMD state of a real PMD fiber. The connectors can be adjusted to produce different sets of polarization modifications to produce different PMD states to represent different possible PMD states of the real PMD fiber.
    Type: Grant
    Filed: November 30, 2000
    Date of Patent: April 1, 2003
    Assignees: University of Southern California, University of Maryland Baltimore County
    Inventors: Reza Khosravani, Paniz Ebrahimi, Ivan T. Lima, Jr., Edem Ibragimov, Alan E. Willner, Curtis R. Menyuk
  • Patent number: 6538748
    Abstract: A tunable optical cavity constructed from a fixed mirror and a movable mirror is disclosed. A circuit applies an electrical potential between first and second electrically conducting surfaces thereby adjusting the distance between the fixed and movable mirrors. The fixed mirror and the moveable mirror are positioned such that the mirrors form the opposite ends of the optical cavity. The distance between the fixed mirror and the moveable mirror is a function of the applied electrical potential. The thermally induced vibrations are reduced by utilizing an electrical feedback circuit that measures the distance between the mirrors. The feedback circuit dynamically changes the potential between the substrate and the support member so as to reduce fluctuations in the cavity resonance frequency.
    Type: Grant
    Filed: April 14, 2000
    Date of Patent: March 25, 2003
    Assignee: Agilent Technologies, Inc
    Inventors: Rodney S. Tucker, Wayne V. Sorin, Douglas M. Baney
  • Patent number: 6530700
    Abstract: A fiber optic connector including a molded alignment coupler including a base plate, an opening in the base plate, and at least one alignment channel in the base plate. A housing upstanding from base plate surrounds the opening and the one alignment channel; and an insert plate is placed in the housing, the insert plate including an opening etched therethrough corresponding to the opening in the base plate of the coupler, and at least one channel etched in the insert plate corresponding to the alignment channel of the coupler.
    Type: Grant
    Filed: November 29, 2000
    Date of Patent: March 11, 2003
    Assignee: Teraconnect, Inc.
    Inventor: Richard J. Williams
  • Patent number: 6529657
    Abstract: A method and apparatus of coupling pump light from an extended source to an optical waveguide is disclosed. The coupling is preferably achieved through the use of a v-groove in the optical waveguide and an angle-selective mechanism that enables the angular distributions of the pump light to be optimized for optimal coupling via facets of the v-groove. Embodiments of the apparatus use a wedge, a double wedge, mirrors, or composite lenses to affect the angle selection of the pump light.
    Type: Grant
    Filed: February 23, 2001
    Date of Patent: March 4, 2003
    Assignee: Keopsys, Inc.
    Inventors: Lew Goldberg, Marc LeFlohic
  • Patent number: 6529582
    Abstract: An X-ray scatter reduction grid includes a first layer having a plurality of cells. The cells have a perimeter formed of an X-ray absorbing material. The shape of the perimeters can vary, but a polygonal shape is preferred. The grid can also include other layers, each with their own cells. The cells of the subsequent other layers are larger than and offset from the cells of the prior layer. The increased size of the cells allows a primary ray passing through the center of a first layer cell to also pass through the center of a subsequent layer cell. This allows for a maximum of primary ray passthrough and a maximum of scatter absorption.
    Type: Grant
    Filed: September 6, 2001
    Date of Patent: March 4, 2003
    Assignee: The Johns Hopkins University
    Inventors: Howard S. Feldmesser, Paul R. Falk, Thomas J. Beck, Harry K. Charles, Jr.
  • Patent number: 6523368
    Abstract: There is provided a dispersion-managed fiber preform and a fabricating method thereof preform by modified chemical vapor deposition (MCVD). A core and a clad having the refractive index distribution of an optical fiber with a positive dispersion value are uniformly deposited in a glass tube. The preform with the positive dispersion value is heated at every predetermined period with a torch and the heated preform portions are etched to have a negative dispersion value. Then, the preform alternately having positions with the positive dispersion value and positions with the negative dispersion value along the length direction is collapsed.
    Type: Grant
    Filed: January 16, 2001
    Date of Patent: February 25, 2003
    Assignee: Samsung Electronics Co., LTD
    Inventors: Jae-Deuk Lee, Yong-Woo Park, Ghie-Hugh Song, Un-Chul Paek, Mun-Hyun Do
  • Patent number: 6524529
    Abstract: An ultraviolet disinfection (UV) system for appliances including at least one UV light-ready appliance having at least one portal in the appliance for receiving UV light input from at least one light source, which is removably connected to the at least one UV light-ready appliance via a connector at the portal, and positioned to provide a focused, controllable UV light output that has at least one UV dose zone for providing effective sterilization of microorganisms and disinfection within an interior of the appliance.
    Type: Grant
    Filed: November 28, 2000
    Date of Patent: February 25, 2003
    Inventor: Isaac B. Horton, III
  • Patent number: 6522820
    Abstract: A method of fabricating a microstructured optical fiber is described in which a plurality of solid silica wafers are generated corresponding to longitudinally consecutive portions of the optical fiber, separately etched with void patterns in a lithographic process, and bonded together into a preform. The preform is then drawn to form the optical fiber. The lithographic process used to form the void patterns in the wafers may be any of several processes currently or prospectively used in VLSI fabrication. Such lithographic process may be used because the wafers comprise silica glass or other material common in VLSI devices and, in accordance with a preferred embodiment, are generated with thicknesses highly amenable to such fabrication methods. The wafers are preferably generated by creating a preliminary preform having the desired material refractive index profile using conventional preform fabrication methods, the wafers then being sliced from the preliminary preform.
    Type: Grant
    Filed: February 12, 2001
    Date of Patent: February 18, 2003
    Assignee: Gazillion Bits, Inc.
    Inventor: Shih-Yuan Wang
  • Patent number: 6510262
    Abstract: An optical coupling system includes a unitary separation-setting member for establishing precise spatial relationships among a microlens array, an array of light sources, and an array of optical fibers. The separation-setting member includes an interior region with a shoulder against which the lens array is positioned. The shoulder is at a precisely controlled distance from a target plane along which the ends of the optical fibers are aligned. The target plane is defined by the front surface of the separation-setting member. Thus, the dimensions of the separation-setting member control the distance of the fiber ends from the microlenses. Moreover, a back surface of the separation-setting member is at a precisely controlled distance from the shoulder, so that when the back surface is rested against a substrate on which the light sources are mounted, the light sources are precisely positioned relative to the microlenses.
    Type: Grant
    Filed: December 15, 2000
    Date of Patent: January 21, 2003
    Assignee: Agilent Technologies, Inc.
    Inventors: Kendra Gallup, Brian Kim
  • Patent number: 6507635
    Abstract: A system and method for radiographic inspection of an aircraft fuselage includes a radiation source located on one side of the fuselage and a plurality of radiation detectors located on another side of the fuselage. The system includes manipulators for moving the radiation source and the radiation detectors in a coordinated fashion. Radiation detected by the radiation detectors is processed to display stereoscopic images of areas of interest of the fuselage. The radiation source and detector positions are manipulated to obtain multiple sets of images from different viewing angles. The multiple sets of images are used to produce the stereoscopic images.
    Type: Grant
    Filed: March 30, 2001
    Date of Patent: January 14, 2003
    Assignee: General Electric Company
    Inventors: Thomas William Birdwell, Andrew Joseph Galish
  • Patent number: 6504900
    Abstract: An optical sample X-ray testing apparatus including an X-ray source which is configured to radiate X-rays including a group of line spectra. At least one line spectrum selecting device is provided between the X-ray source and an optical sample and configured to direct substantially one line spectrum among the group of line spectra from the X-ray source toward the optical sample. An optical characteristics finding device is configured to find optical characteristics of the optical sample based on radiation of the substantially one line spectrum through the line spectrum selecting device onto the optical sample.
    Type: Grant
    Filed: March 23, 2001
    Date of Patent: January 7, 2003
    Assignee: Nikon Corporation
    Inventors: Hiroyuki Kondo, Masayuki Shiraishi
  • Patent number: 6501828
    Abstract: An x-ray apparatus has an x-ray source and an x-ray receiver, the x-ray source being adjustable relative to a subject and emitting x-rays in the direction toward the x-ray receiver during the course of radiological exposures of the subject. The x-ray apparatus has an arrangement in the beam path of the x-rays for influencing the shape and/or the intensity profile of the x-ray beam, and this arrangement is dynamically adjustable during radiological exposures of the subject for influencing the shape and/or the intensity profile of the x-rays.
    Type: Grant
    Filed: October 20, 2000
    Date of Patent: December 31, 2002
    Assignee: Siemens Aktiengesellschaft
    Inventor: Stefan Popescu
  • Patent number: 6490033
    Abstract: A method of calibrating an interferometer system and a multilayer thin film used for calibrating the interferometer system. The method including measuring the step height of a gold step with the interferometer system, the multilayer thin film comprising a gold layer that defines the gold step. The multilayer thin film having an optical flat, a first layer on the surface of the optical flat, a second layer on the first layer, a test layer on a part of the second layer, and a gold layer on the test layer and on a part of the second layer uncovered by the test layer. The test layer having a test layer step, and the gold layer having a gold step over the test layer step. Also, a reference standard and a method of making the reference standard for a thin film sample with one or more component thin film layers, the reference standard having a gold layer over the surface of the thin film sample.
    Type: Grant
    Filed: January 5, 2000
    Date of Patent: December 3, 2002
    Assignee: Lucent Technologies Inc.
    Inventors: David Gerald Coult, Gustav Edward Derkits, Jr., Franklin Roy Dietz, Ranjani C. Muthiah, Sonja Radelow
  • Patent number: 6477236
    Abstract: A rotary anode X-ray tube, comprising a rotor, a stationary structure, a dynamic pressure slide bearing formed between the rotor and the stationary structure, the stationary structure having a lubricant storage chamber and provided with a lubricant passageway, and a vacuum vessel. Holes are formed in the stationary structure extending from the lower edge surface along the tube axis and not to cross the lubricant storage chamber and the lubricant passageway. Heat transfer members for the stationary structure having a heat conductivity higher than that of the stationary structure are inserted into the holes, respectively. A heat transfer member having a heat conductivity higher than that of the inner cylindrical structure of the rotor is bonded in a cylindrical form to the outer circumferential wall of the inner cylindrical structure constituting a bearing. A heat transfer member can be mounted to each of the rotor and the stationary structure.
    Type: Grant
    Filed: October 18, 2000
    Date of Patent: November 5, 2002
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hidero Anno, Yukinari Yoshida, Hironori Nakamuta
  • Patent number: 6466308
    Abstract: The present invention disclose a method for measuring a thermal expansion coefficient of a thin film, in which the thin film is first deposited on two substrates having different thermal expansion coefficients under the same conditions. For each of the two deposited substrates, a relationship between the thin film stresses and the measuring temperatures is established by using a phase shifting interferometry technique, in which the stresses in the thin films are derived by comparing the deflections of the substrates prior to and after the deposition. Based on the two relationships the thermal expansion coefficient, and elastic modulus, E f ( 1 - v f ) , can be calculated, wherein Ef and &ngr;f are the Young's modulus and Poisson's ratio of the thin film, respectively.
    Type: Grant
    Filed: April 12, 2000
    Date of Patent: October 15, 2002
    Assignee: Precision Instrument Development Center, National Science Council
    Inventors: Cheng-Chung Jaing, Cheng-Chung Lee, Chuen-Lin Tien, Ing-Jer Ho
  • Patent number: 6459710
    Abstract: A semiconductor laser system includes a reflector on the lid that directs light emitted from the front facet to the monitoring diode. Thus, even when the diode is installed behind the semiconductor laser chip, and as a result receives back facet light, the ratio of front facet to back facet light received by the monitoring diode is increased due to the operation of the reflector. This configuration improves power tracking in Bragg grating stabilized semiconductor laser systems, for example.
    Type: Grant
    Filed: November 7, 2000
    Date of Patent: October 1, 2002
    Assignee: Axsun Technologies, Inc.
    Inventors: Peter S. Whitney, Mark E. Kuznetsov, Steven C. Fawcett, Mark R. Malonson
  • Patent number: 6459768
    Abstract: A method and apparatus for providing a window frame and window for use in an x-ray tube, wherein the new structure reduces deforming stresses on the window produced by pressure differential incident upon the window. The support structure of the window frame to which the window is attached is angled toward the interior of the x-ray tube to an angle equaling the deflection to which a window is typically subjected in standard window frames. A window mounted to a frame in accordance with the present invention is subjected to reduced or eliminated deforming stresses, even in high deflection stress environments including air bake x-ray tube manufacturing processes. This elimination of deforming stresses allows for the use of thinner x-ray tube windows enabling a higher transmissivity of produced x-rays.
    Type: Grant
    Filed: October 6, 2000
    Date of Patent: October 1, 2002
    Assignee: Varian Medical Systems, Inc.
    Inventors: Thomas Koller, Charles Lynn Chidester, Mark Alan Heber
  • Patent number: 6457859
    Abstract: A CT scanner comprises a beryllium window mounted on an x-ray insert, a cooling fluid circulation line, and a cooling fluid return line. A plurality of fins are mounted in the cooling fluid circulation line. The fluid circulation line is in fluid communication with one of an anode side cavity and a cathode side cavity and in fluid communication with a heat exchanger. The fluid return line is in fluid communication with the heat exchanger and in fluid communication with the other one of the anode side cavity and the cathode side cavity. A pump means circulates the cooling fluid through the heat exchanger, the suction and return lines, and the x-ray tube housing assembly.
    Type: Grant
    Filed: October 18, 2000
    Date of Patent: October 1, 2002
    Assignee: Koninklijke Philips Electronics NV
    Inventors: Qing Kelvin Lu, Mark S. Maska