Patents Examined by Cassandra Spyrou
  • Patent number: 6542655
    Abstract: An N×N crossconnect switch, for large N, is implemented using an arrangement of smaller wavelength routers combined with space switches. An N×N crossconnect switch is constructed in three stages, using a plurality of input space switches, a plurality of (N/m)×(N/m) router (whose reduced size N/m allows efficient realization in integrated form), and a plurality of output space switches. In the router, the number of wavelengths is reduced by a factor m. The input and output space switches can be implemented using crossbar or Clos type construction. In one arrangement each modulator is combined with a small space switch consisting of 2×2 elements. Each space switch can be realized with negligible crosstalk by using a dilated arrangement.
    Type: Grant
    Filed: August 31, 2000
    Date of Patent: April 1, 2003
    Assignee: Lucent Technologies Inc.
    Inventor: Corrado P. Dragone
  • Patent number: 6542664
    Abstract: An improved highly doped waveguide is provided which comprises a waveguide employing an Er dopant and Pr sensitizer ions. The present invention also provides a method of efficient coupling from an optical source into a waveguide using a rotated optical element.
    Type: Grant
    Filed: October 19, 2001
    Date of Patent: April 1, 2003
    Assignee: Science & Technology Corporation @ UNM
    Inventors: Balaji Srinivasan, Ravinder K. Jain, Jason David Tafoya
  • Patent number: 6542660
    Abstract: An optical add/drop multiplexing (OADM) device can increase the number of information channels carried by an optical waveguide by utilizing different wavelength regions of light. In other words, each information channel can be assigned a specific wavelength region of light The OADM device can add additional virtual optical waveguides equal to the number of wavelength regions of light that can be efficiently propagated along a single optical waveguide. The OADM device can utilize conventional diode laser technology for adding information channels at predefined wavelength regions into an optical network. The OADM device can stabilize the output wavelength region of a conventional laser diode to any specific wavelength region with minimal hardware or structural modifications. By utilizing off the shelf hardware, the OADM device can lower manufacturing costs while providing an ample supply of spare parts.
    Type: Grant
    Filed: May 25, 2000
    Date of Patent: April 1, 2003
    Assignee: Cirrex Corp.
    Inventors: Michael W. Medin, Michael L. Wach
  • Patent number: 6542686
    Abstract: The present invention provides an optoelectronic device and a method of manufacture therefor, that prevents dopant diffusion and controls the dopant concentration therein. The optoelectronic device includes an active region formed over a substrate, and an interface barrier layer and barrier layer located over the active region. The optoelectronic device further includes an upper cladding layer located over the interface barrier layer and the barrier layer. In an exemplary embodiment of the invention, the interface barrier layer is an indium phosphide interface barrier layer and the barrier layer is an indium gallium arsenide phosphide barrier layer.
    Type: Grant
    Filed: August 25, 2000
    Date of Patent: April 1, 2003
    Assignee: Lucent Technologies Inc.
    Inventors: Michael Geva, Claude Lewis Reynolds, Jr., Lawrence E. Smith
  • Patent number: 6538974
    Abstract: An optical system and method for selective transmission of light between a source of light and set of storage disks along an optical path includes at least one polarization maintaining optical fiber optical fiber. Various noise reduction techniques are provided by substantially decreasing or eliminating spurious reflections (or the effects thereof) at end faces and of an optical fiber. In particular, various techniques, such as index matching, a cover slip method, or laser modulation, may be used to eliminate spurious reflections (or the effects thereof) at the front end face of the optical fiber. Various techniques, such index matching or multi-mode fiber splicing, may be used to eliminate spurious reflections (or the effects thereof) at the end face of the optical fiber.
    Type: Grant
    Filed: August 22, 2001
    Date of Patent: March 25, 2003
    Assignee: Seagate Technology LLC
    Inventors: Jeffrey P. Wilde, Alexander Tselikov, Yongwei Zhang, George R. Gray
  • Patent number: 6538815
    Abstract: A method and apparatus of bi-directional optical circulation are provided wherein, for a plurality of optical input/output ports including a certain logical sequence, light of a first set of lights inputted to any port is outputted from the logical next port in the sequence and is prevented from being output from any other port and light of a second set of lights different from the first set inputted to any port is outputted from the logical preceding port in the sequence and is prevented from being output from any other port. An apparatus including a bi-directional optical circulator capable of either band bi-directional or interleaved bi-directional operation is also provided.
    Type: Grant
    Filed: May 18, 2000
    Date of Patent: March 25, 2003
    Assignee: Avanex Corporation
    Inventor: Simon Cao
  • Patent number: 6533439
    Abstract: An indicator light for a motor vehicle includes a divider screen adapted to divide a light beam into a plurality of elementary light beams which are then added together downstream of the dividing screen. A first coloring means, for coloring some of the elementary light beams, is located at a distance from the divider screen. The light unit includes a second coloring means adapted to color at least some of the elementary light beams, the second coloring means being spaced away from the divider screen and the first coloring means.
    Type: Grant
    Filed: May 13, 1998
    Date of Patent: March 18, 2003
    Assignee: Valeo Vision
    Inventors: Vincent Duflos, Régis Duplessy, Benoist Fleury, Vincent Godbillon
  • Patent number: 6535332
    Abstract: An infrared optical system for infrared cameras has a convex lens held by a holding member composed of a low-dispersion material that transmits infrared light. A stop for restricting light beams entering the convex lens is disposed on an object side from the convex lens. An aberration correcting plate for reducing spherical aberration is provided in the vicinity of the stop. A field flattener, the thickness of which changes along image height to offset curvature of field, is disposed on an image side of the convex lens.
    Type: Grant
    Filed: November 2, 2000
    Date of Patent: March 18, 2003
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Takayuki Nakano, Yasuhisa Tamagawa
  • Patent number: 6535340
    Abstract: When n is taken as integers of 2 or more, n reflecting systems are constituted by providing reflecting mirrors on opposite (two) side surfaces in 2n side surfaces of a transparent body having the shape of a 2n-sided prism. The n reflecting systems are provided on each pair of opposite side surfaces, and images of an object are formed using each of the n reflecting systems.
    Type: Grant
    Filed: September 21, 1998
    Date of Patent: March 18, 2003
    Assignee: Canon Kabushiki Kaisha
    Inventor: Hiroshi Saruwatari
  • Patent number: 6535336
    Abstract: A high reflection mirror has a layer structure comprising on a substrate, a TiOx layer, an Ag layer, an Al2O3 layer and a TiO2 layer in this order, or alternatively on a substrate, an SiOx layer, a Cr layer, an Ag layer, an Al2O3 layer and a TiO2 layer in this order (1≦x≦2). An SiOy protective layer may be formed on the top TiO2 layer (1≦y≦2). The high reflection mirror shows a high reflectance and a high durability and can be produced at a lower cost because of the reduced number of layers.
    Type: Grant
    Filed: May 23, 2001
    Date of Patent: March 18, 2003
    Assignee: Canon Kabushiki Kaisha
    Inventor: Shumpei Tatsumi
  • Patent number: 6530668
    Abstract: A heat-formable mirror comprising a flat substrate capable of plastic flow upon application of heat and a sputter-deposited coating formed on the surface of the substrate. From the substrate outwardly, the coating comprises a transparent amorphous layer and a reflective layer comprising contiguous first and second different metal films. The first metal film, positioned nearer the substrate than the second metal film, is a reflective metal film, and the second metal film comprises a protective film that is less reflective than the reflective metal film, the second metal film being of niobium, tungsten, tantalum, iron and nickel and being present in a thickness sufficient to protect the first metal film and avoid significant reduction of reflectance during heat forming of the mirror.
    Type: Grant
    Filed: December 22, 2000
    Date of Patent: March 11, 2003
    Assignee: Cardinal CG Company
    Inventor: Annette J. Krisko
  • Patent number: 6532120
    Abstract: An optical filter comprises a transparent support and a filter layer. The filter layer has an absorption maximum in the wavelength region of 560 to 620 nm. The absorption maximum has a half-width in the range of 5 to 50 nm. The optical filter properly absorbs undesired light component emitted from an image display apparatus (especially, a plasma display panel).
    Type: Grant
    Filed: April 20, 2001
    Date of Patent: March 11, 2003
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Toru Harada, Tsukasa Yamada, Ryuta Suzuki, Yoshiharu Yabuki, Junji Nishigaki
  • Patent number: 6532321
    Abstract: A fiber optic isolator device is used by fiber optic systems operating at more than one wavelength. The device may be inserted anywhere within the fiber network. The fiber optic device permits the separation of the wavelengths so that an optical isolator module can isolate a first wavelength without significantly affecting the second wavelength. This device is useful isolating a communications signal at 1.55 &mgr;m while avoiding significant losses for an optical time domain reflectometry signal, for example at 1.3 &mgr;m.
    Type: Grant
    Filed: February 16, 2000
    Date of Patent: March 11, 2003
    Assignee: ADC Telecommunications, Inc.
    Inventors: B. Barry Zhang, Liang-Ju Lu
  • Patent number: 6532112
    Abstract: An anti-reflection layer system is composed of 5 layers of oxide materials and the materials of the outermost layer has a high-refractive index between 1.9 to 2.1. The materials of outermost layer are a kind of transparent conductive coating such as SnO2, ZnO2, In2O3 and ITO. Because of the surface layer has a good electrical conductive property, the layer system reduce much of work of grounding process and also increase the total yield in the volume production. The present invention provided a surface conductive layer structure of anti-reflection coating, which can be applied not only on display industry but also on touch sensor industry for glass and plastic substrate.
    Type: Grant
    Filed: April 18, 2001
    Date of Patent: March 11, 2003
    Assignee: Applied Vacuum Coating Technologies Co., Ltd.
    Inventor: Jau-Jier Chu
  • Patent number: 6532119
    Abstract: A laminated film including two polyester films each having a thermal shrinkage. A metal layer is deposited on one surface of at least one of the polyester films which are secured together using a laminating adhesive to form a laminated reflector film. In one embodiment in which the laminated film is used to manufacture a thin film mirror using a wrap around technique, the thickness of each of the polyester films is less than or equal to approximately 0.001 inch and a total combined thickness of less than or equal to approximately 0.002 inch (50 microns) thick. Preferably, each polyester film has a thickness of approximately 0.0005 inch and a total thickness of approximately 0.001 inch. Alternatively, the laminated film may be used to manufacture a thin film mirror using a face bond technique, wherein the total combined thickness of the two polyester films is less than or equal to approximately 0.004 inch, preferably the total thickness is less than or equal to approximately 0.003 inch.
    Type: Grant
    Filed: January 3, 2000
    Date of Patent: March 11, 2003
    Inventor: Eugene Martinez, Sr.
  • Patent number: 6532068
    Abstract: In a method of spectrochemical depth-profile analysis of heterogeneous materials, a first burst of ablation laser pulses in a first beam is directed at a sample to form an ablation crater. A second single pulse or burst of laser pulses in a second beam having a smaller width than said first beam is then directed at the bottom of the crater so as to create a plasma that emits radiation representative of a component in the sample without a significant contribution from the walls of the ablation crater. The intensity of radiation from the plasma is measured and the concentration of the selected component is determined from the intensity of the radiation. The depth at which the measurement is taken is then evaluated and the above steps repeated to determined the evolution of concentration of said selected component as a function of depth.
    Type: Grant
    Filed: July 17, 2001
    Date of Patent: March 11, 2003
    Assignee: National Research Council of Canada
    Inventors: Vincent Detalle, Mohamad Sabsabi
  • Patent number: 6529669
    Abstract: A junction box for a single-tube cable, and particularly an optical fiber cable for the connection of one or several wires or fibers of the cable to one or several wires or fibers of another cable. The box has a hollow support (3) suitable for a tensioned connected cable crossing (C) and a spacer (2) to hold the casing of the axially cut cable spread inside the hollow support (3) to free the cable wires or fibers (F). Application to the installation and maintenance of cable networks is also described.
    Type: Grant
    Filed: February 9, 1999
    Date of Patent: March 4, 2003
    Assignee: France Telecom
    Inventor: Daniel Crespel
  • Patent number: 6529325
    Abstract: A compact inline fiber optic polarization splitter/combiner for use in fiber optic communications. The splitter/combiner uses two birefringent wedges aligned with their optical axis at 90° from each other and their bases disposed oppositely to each other. One lens is used at the input to couple light from the input fiber. A single output lens is used to couple light into two adjacent polarization maintaining fibers. When used as a combiner a beam of a first linear polarization state from one input fiber is combined with a beam of second linear polarization state from a second input fiber into a third output fiber carrying both beams. The splitter/combiner also provides for the ready alignment of the input and output beams further saving cost and complexity.
    Type: Grant
    Filed: September 15, 2000
    Date of Patent: March 4, 2003
    Assignee: Micro Optics, Inc.
    Inventors: Jan W. Kokkelink, Talal K. Findakly
  • Patent number: 6529296
    Abstract: A hologram scanner is constructed with a driving source for providing a rotational force, a deflection disk installed at the rotation shaft of the driving source for forming a scanning line, the deflection disk having a plurality of sectors where a hologram pattern for diffracting and deflecting incident light is formed, a TE polarized light emitting device, arranged to face one side of the deflection disk, for emitting TE polarized light so that major axis of an elliptical spot formed at a predetermined position on the deflection disk by the incident light is perpendicular to the radius vector of the deflection disk passing through the spot having an elliptical cross-section and a TE polarization mode, and an optical path altering device for altering the proceeding path of incident light, so that a scanning line formed by the rotation of the deflection disk proceeds to a photoreceptor medium.
    Type: Grant
    Filed: August 9, 2000
    Date of Patent: March 4, 2003
    Assignee: SamSung Electronics Co., Ltd.
    Inventor: Moon-gyu Lee
  • Patent number: 6529328
    Abstract: This invention relates to invention relates to a variable slope optical filter in the form of a Fabry-Perôt etalon having an end face with a variable finesse. A method for filtering and a variable slope optical filter for in-line use with an optical amplifier signal is also disclosed. The filter has a wavelength response that is substantially linear in slope within a band of operation wavelengths of the amplifier; the slope of the filter in an operating band of wavelengths is between zero and a only one of a positive or negative number; furthermore the filter has an amplitude response that has an opposite and counter slope as a function of wavelength to that of a gain tilt of the amplifier within the operation band of wavelengths. Relative movement between the filter and the optical amplifier signal is provided to vary the slope of the filter by means of varying the amplitude wavelength response of the filter.
    Type: Grant
    Filed: July 30, 1999
    Date of Patent: March 4, 2003
    Assignee: JDS Fitel Inc.
    Inventors: Yihao Cheng, Donald R. Zimmerman