Patents Examined by John D. Lee
  • Patent number: 7604419
    Abstract: An optical module capable of preventing the efficiency of optical coupling from deteriorating even if temperature varies. The optical module 1 has a holder 2 and an aspherical lens 11, which are formed of a plastic so as to be integrated with each other. The holder 2 has a cylindrical portion 8 which engages a photoelectric transfer element package 3. The photoelectric transfer element package 3 has a flange portion 15 which butts the open end face 16 of the cylindrical portion 8. The flange portion 15 is bonded to the open end face 16 of the cylindrical portion 16, and a gap is formed between the outer peripheral surface 18 of the cap 12 of the photoelectric transfer element package 3 and the inner peripheral surface of the cylindrical portion 8.
    Type: Grant
    Filed: January 29, 2004
    Date of Patent: October 20, 2009
    Assignee: Enplas Corporation
    Inventor: Shimpei Morioka
  • Patent number: 7280728
    Abstract: An optical fiber including: (i) a silica based, rare earth doped core having a first index of refraction n1; (ii) a silica based inner cladding surrounding the core and having a second index of refraction n2, such that n1>n2, said inner cladding having a plurality of air holes extending longitudinally through the length of said optical fiber; (iii) a silica based outer cladding surrounding said inner cladding and having a third index of refraction n3, such that n2>n3, wherein said optical fiber supports a single polarization mode within the operating wavelength range.
    Type: Grant
    Filed: October 22, 2004
    Date of Patent: October 9, 2007
    Assignee: Corning Incorporated
    Inventors: George E Berkey, Xin Chen, Joohyun Koh, Ming-Jun Li, Daniel A Nolan, Donnell T Walton, Ji Wang, Luis A Zenteno
  • Patent number: 7272293
    Abstract: A device including: at least two electronic/electrical components; and a casing, the casing having at least a portion thereof acting as a communication bus for connecting the at least two electronic/electrical components.
    Type: Grant
    Filed: August 12, 2003
    Date of Patent: September 18, 2007
    Assignee: Omnitek Partners LLC
    Inventors: Jahangir S. Rastegar, Harbans Dhadwal, Thomas Spinelli
  • Patent number: 7224861
    Abstract: A switch core is set forth that comprises a plurality of duplex switches that are interconnected with a interconnection fabric to implement, for example, strictly non-blocking operation of the switch core for reciprocal traffic. In one embodiment, an N-way reciprocal switch is implemented. The N-way reciprocal switch comprises a plurality of duplex switches numbering N of at least a 1×(N?1) switch type (e.g., the duplex switches have at least N?1 ports available for connection to implement the interconnection fabric). The interconnection fabric interconnects the plurality of duplex switches so that each duplex switch is connected to every other duplex switch used in the interconnection fabric by a single connection. A similar architecture using switches numbering N of at least a 1×N switch type are also set forth.
    Type: Grant
    Filed: September 23, 2005
    Date of Patent: May 29, 2007
    Assignee: Tellabs Operations, Inc.
    Inventors: Philip J. Lin, Paul E. Green, Jr., Oman A. Gerstel
  • Patent number: 7215854
    Abstract: An improved low-loss waveguide crossover uses an out-of-plane, such as vertical, waveguide to bridge over any number of waveguides with very low, or essentially no, optical loss or crosstalk. Optical signals transmitted in a waveguide system having the improved waveguide crossover can cross over one or multiple transverse waveguides with a greatly reduced loss of signal intensity by using a second waveguide (such as a bridge) positioned in a second plane different from the plane containing the transverse waveguides. An optical signal from the input waveguide is coupled efficiently through directional coupling to the bridge waveguide and optionally from the bridge waveguide to the output waveguide. Methods for fabricating the improved waveguide crossover are described.
    Type: Grant
    Filed: August 12, 2005
    Date of Patent: May 8, 2007
    Assignee: Gemfire Corporation
    Inventors: Arthur Telkamp, Randy Bindrup
  • Patent number: 7215860
    Abstract: The present invention provides an apparatus comprising a passive optical transmission fiber. The passive optical transmission fiber comprises a passive glass fiber core, a glass optical inner cladding surrounding the core and a glass optical outer cladding surrounding the inner cladding. The inner cladding has a lower index of refraction than the passive glass fiber core and the outer cladding has a lower index of refraction than the inner cladding. The passive optical transmission fiber also comprises a second optical segment coupled to the optical fiber. The second optical segment is configured to dissipate light in the inner cladding.
    Type: Grant
    Filed: May 2, 2005
    Date of Patent: May 8, 2007
    Assignee: Lucent Technologies Inc.
    Inventors: Jon W. Engelberth, Douglas P. Holcomb, Paul F. Wysocki
  • Patent number: 7210862
    Abstract: The present invention provides a configuration to improve a heat-radiating effect of an optical subassembly having a co-axial package and a plurality of lead pins arranged in an arrayed shape. The heat generated inside the subassembly may be dissipated through the heat-radiating fin attached to a flat surface, not a curved side surface of the subassembly such that the lead pins provided in the subassembly pass through the slot provided in the heat-radiating fin. The heat-radiating fin has a slab portion attached to the cover of the transceiver, when the subassembly is installed within the transceiver. Thus, the heat generated in the subassembly can be easily and effectively dissipated to the cover.
    Type: Grant
    Filed: June 13, 2005
    Date of Patent: May 1, 2007
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Satoshi Yoshikawa, Toshio Mizue
  • Patent number: 7209623
    Abstract: A semiconductor waveguide based optical receiver is disclosed. An apparatus according to aspects of the present invention includes an absorption region defined along an optical waveguide. The absorption region includes a first type of semiconductor material having a first refractive index. The apparatus also includes a multiplication region defined along the optical waveguide. The multiplication region is proximate to and separate from the absorption region. The multiplication region includes a second type of semiconductor material having a second refractive index. The first refractive index greater than the second refractive index such that an optical beam directed through the optical waveguide is pulled towards the absorption region from the multiplication region and absorbed in the absorption region to create electron-hole pairs from the optical beam. The multiplication region includes first and second doped regions defined along the optical waveguide.
    Type: Grant
    Filed: May 3, 2005
    Date of Patent: April 24, 2007
    Assignee: Intel Corporation
    Inventor: Michael T. Morse
  • Patent number: 7209282
    Abstract: Provided is a resonant cascaded difference frequency generator that is capable of improving the conversion efficiency of the second-order nonlinear optical phenomena by resonating the second harmonic wave of a pump light. The resonant cascaded difference frequency generator includes: a nonlinear medium, which receives a pump light and a signal light and then generates the second harmonic wave of the pump light through second harmonic generation, in a cascaded way generates a converted light of a difference frequency through difference frequency generation between the signal light and the second harmonic wave; and a resonant structure that resonates the second harmonic wave of the pump light on the basis of the nonlinear medium.
    Type: Grant
    Filed: December 30, 2004
    Date of Patent: April 24, 2007
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Jong Bae Kim, Jung Jin Ju, Min Su Kim, Byeong Ha Lee
  • Patent number: 7209628
    Abstract: An optical device for collecting light and selectively outputting or concentrating the light. A layer has an optical index of refraction n1, and top, bottom and side surfaces defining an angel of inclination ?. A back surface spans the top, bottom and side surface. A first layer is coupled to the bottom surface of the layer and has an index of refraction n2. The first layer index n2 causes light input through the back surface of the layer to be preferentially output into the first layer. A second layer is coupled to the bottom of the first layer and selectively causes output of light into ambient. Additional layers, such as alight polarization layer, a polarization converting layer a and a post LCD diffuser layer can be used to make preferential use of polarized light of diffuse light having passed through the LCD layer to enhance viewing of the output light.
    Type: Grant
    Filed: May 16, 2005
    Date of Patent: April 24, 2007
    Assignee: 3M Innovative Properties Company
    Inventors: Roland Winston, Robert L. Holman, Benjamin A. Jacobson, Robert M. Emmons, Philip Gleckman
  • Patent number: 7206122
    Abstract: A wavelength converter that is used in an optical communication system utilizing wavelength multiplexing. The wavelength converter has a quasi-phase matched quartz crystal that has a second-order nonlinear effect, and a light coupling device that mixes the signal light and control light and inputs this mixed light into the quasi-phase matched quartz crystal. The wavelength converter also has quartz type optical fibers between the light coupling device and the quasi-phase matched quartz crystal. The mode diameter of the quartz type optical fibers is substantially the same as the mode diameter of the optical waveguide.
    Type: Grant
    Filed: September 18, 2003
    Date of Patent: April 17, 2007
    Assignee: National Institute for Materials Science
    Inventors: Sunao Kurimura, Masaki Harada
  • Patent number: 7202994
    Abstract: The present invention relates to a wavelength converter of structure enabling generation of converted light with high power even with a large difference between the wavelength of pumping light and the zero-dispersion wavelength. The wavelength converter includes an optical fiber having a dispersion slope whose absolute value at the wavelength of 1550 nm is 0.01 ps/nm2/km or less, for example.
    Type: Grant
    Filed: March 19, 2004
    Date of Patent: April 10, 2007
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Toshiaki Okuno, Masaaki Hirano, Takatoshi Kato
  • Patent number: 7203400
    Abstract: A dispersion compensator having relatively uniform transmission characteristics over the bandwidth of a communication channel. The compensator is designed to process an optical signal corresponding to the communication channel by decomposing that signal into spectral components, routing different components along different optical paths that impart relative delays between the components, and recombining the delayed components spatially and directionally to generate a processed optical signal with reduced chromatic dispersion. In one embodiment, the compensator is a waveguide circuit that includes four diffraction gratings operating in transmission and optically coupled to a tunable lens array, in which different tunable lenses receive light corresponding to different communication channels. For each channel, a desired group delay value is produced by selecting magnification strength of the corresponding tunable lens.
    Type: Grant
    Filed: November 16, 2005
    Date of Patent: April 10, 2007
    Assignee: Lucent Technologies Inc.
    Inventor: David T. Neilson
  • Patent number: 7202993
    Abstract: The invention relates to a device for the production of tuneable light impulses in a visible spectral range, comprising a laser system (LS) which emits femtosecond light impulses in the infrared spectral range, and an optical frequency converter (FC) for converting the wave lengths of the light impulses into the visible spectral range. According to the invention, the wave length of the light impulse emitted by the laser system can be tuned in order to provide said type of device which can be used as a light source for time-resolved fluorescence spectroscopy. Said device also comprises an optical stretcher which enables the duration of the impulse of the frequency converted light impulse to be increased to at least 1 ps.
    Type: Grant
    Filed: February 25, 2004
    Date of Patent: April 10, 2007
    Assignee: Toptica Photonics AG
    Inventors: Florian Tauser, Alfred Leitenstorfer, Frank Lison
  • Patent number: 7203395
    Abstract: A miniature movable device comprises a movable part (a mirror, a movable rod, support arms, and a movable comb tooth electrode) formed on a substrate and adapted to be displaced in a direction parallel to the sheet surface of the substrate, a fixing part formed and fixedly mounted on the substrate, and hinges, each having its opposite ends connected to the movable part and the fixing part and assuming two flexural conditions which are reversed in flexural, the hinges being effective to maintain the movable part at two positions by a self-holding action when it assumes either flexural condition. The substrate is formed with wall surfaces which are disposed oppositely to the opposite surfaces of the hinges over a movable range of the hinges.
    Type: Grant
    Filed: October 1, 2004
    Date of Patent: April 10, 2007
    Assignee: Japan Aviation Electronics Industry Limited
    Inventors: Yoshichika Kato, Keiichi Mori, Satoshi Yoshida, Osamu Imaki, Yoshihiko Hamada, Kenji Kondou
  • Patent number: 7200299
    Abstract: In a first aspect, an apparatus includes a substrate having a planar surface, an optical demultiplexer located along the surface, and an optical cross-connect matrix located along the surface. The optical demultiplexer has N optical outputs. The optical cross-connect matrix has a first array of N optical input ports and a second array of N optical output ports. Each optical input port of the optical cross-connect matrix is optically connected to a corresponding one of the optical outputs of the optical demultiplexer. The output ports have a sequential ordering in the second array that is a nontrivial permutation of a sequential ordering of the corresponding input ports in the first array.
    Type: Grant
    Filed: March 23, 2006
    Date of Patent: April 3, 2007
    Assignee: Lucent Technologies Inc.
    Inventor: Mark Peter Earnshaw
  • Patent number: 7197216
    Abstract: A cable system and method including a cable or a microduct provided within the groove extending vertically into, but not through, a pavement. The cable has a central strength member, at least one buffer tube stranded around the central strength member, an outer jacket surrounding the buffer tube and central strength member, and at least one transmission element provided within said at least one buffer tube. Provided within the microduct is a microduct cable including at least one transmission element. A cable including a central strength member, at least one buffer tube stranded around the central strength member, an outer jacket surrounding the buffer tube and central strength member, and at least one transmission element provided within said at least one buffer tube. The cable has a longitudinal thermal expansion force due to a change in temperature from 20° C. to 70° C. of less than 305 lbs when constrained.
    Type: Grant
    Filed: June 29, 2006
    Date of Patent: March 27, 2007
    Assignee: Draka Comteq B.V.
    Inventors: Olaf Storaasli, Ray Lovie, Bob J. Overton, Jeff Barker, Charles J. Welnack, Terry Holshouser, Sr.
  • Patent number: 7197217
    Abstract: A method of making a fiberoptic light guide utilizes a hollow glass cladding blackened by chemical reduction. The cladding has a predetermined lead content and is heated to an elevated temperature in an atmosphere of substantially 100% hydrogen gas in a furnace. The blackening step is accomplished before or after a bundle of optic fibers is inserted within the cladding and is drawn to produce a fused fiberoptic rod. The blackening step provides the cladding with a black opaque nature that inhibits the transmission of light transversely through the cladding.
    Type: Grant
    Filed: June 30, 2005
    Date of Patent: March 27, 2007
    Assignee: Sunoptic Technologies LLC
    Inventors: Harry Voyagis, Antonio Galarza, Bryant Thigpen
  • Patent number: 7195403
    Abstract: The present invention is to provide an intelligent pluggable transceiver improving EMI tolerance with a simple mechanism. The optical transceiver of the invention includes upper and lower housings, a holder, optical assemblies, a cover, a substrate and a grip. The optical assemblies are fixed with the upper and lower housings together with the holder by interposing a conductive elastic member. Although the rear end of the substrate is exposed outside of the transceiver, the shield gasket and the ground pattern on the substrate shield the contact portion between the substrate and the upper housing, and between the substrate and the cover. Moreover, the grip and the latch lever installed in the lower housing, and the elastic piece realize the latching/releasing mechanism of the transceiver with the host system.
    Type: Grant
    Filed: April 27, 2005
    Date of Patent: March 27, 2007
    Assignee: Sumitomo Electric Industrial, Ltd.
    Inventors: Kazushige Oki, Hiromi Kurashima, Tomoyuki Funada, Shojiro Kiyotake, Kou Nito, Hiroshi Murata
  • Patent number: RE39833
    Abstract: A thermally actuated spectroscopic optical switch including reflective surfaces which are selectively moved into a position intersecting a beam of light by applying electrical or heat energy to a selected composite cantilever beam on which the reflective surface is mounted.
    Type: Grant
    Filed: June 13, 2005
    Date of Patent: September 11, 2007
    Assignee: Southwest Research Institute
    Inventors: Joseph Nathan Mitchell, Martin Peter Wuest