Dielectric Optical Waveguide Type Patents (Class 359/332)
  • Patent number: 10341782
    Abstract: This disclosure provides systems, methods and apparatus related to an ultrasonic receiver for detecting ultrasonic energy received at a first surface of the ultrasonic receiver. The ultrasonic receiver includes an array of pixel circuits disposed on a substrate, each pixel circuit in the array including at least one thin film transistor (TFT) element and having a pixel input electrode electrically coupled to the pixel circuit. The ultrasonic receiver is fabricated by forming a piezoelectric layer so as to be in electrical contact with the pixel input electrodes. Forming the piezoelectric layer includes coating a solution containing a polymer onto the array of pixel circuits, crystallizing the polymer to form a crystallized polymer layer and poling the crystallized polymer layer.
    Type: Grant
    Filed: March 19, 2018
    Date of Patent: July 2, 2019
    Assignee: QUALCOMM Incorporated
    Inventors: Jack Conway Kitchens, II, John Keith Schneider, Stephen Michael Gojevic
  • Patent number: 10331010
    Abstract: A terahertz-wave generating element includes a waveguide including an electro-optic crystal; an optical coupling member that extracts a terahertz wave, which is generated from the electro-optic crystal as a result of light propagating through the waveguide, to a space; and at least two electrodes that cause a first-order electro-optic effect in the electro-optic crystal by applying an electric field to the waveguide so as to change a propagation state of the light propagating through the waveguide. A crystal axis of the electro-optic crystal of the waveguide is set such that the terahertz wave generated by a second-order nonlinear optical process and the light propagating through the waveguide are phase-matched.
    Type: Grant
    Filed: November 16, 2016
    Date of Patent: June 25, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Toshihiko Ouchi
  • Patent number: 10215016
    Abstract: A distributed acoustic sensing cable package having a polymer composite extruded over an optical waveguide to encase the waveguide and to form a crystalline matrix layer acoustically coupled to the waveguide. The crystalline matrix includes reinforcement fibers to further enhance transmission of a cable strain to the optical waveguide. During manufacture of the cable, the polymer composite may be extruded over the optical waveguide and subsequently subjected to heat treatment to increase the crystallinity of the polymer composite and increase the elastic modulus. Both axial and radial strain fields are effectively interact with cased fiber waveguide for producing measurable phase shift signal for distributed acoustic noise detection.
    Type: Grant
    Filed: March 10, 2015
    Date of Patent: February 26, 2019
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Hua Xia, Avinash V. Taware, David A. Barfoot
  • Patent number: 10197793
    Abstract: A light modulator (e.g., for terahertz radiation) may be constructed using a prism in which light undergoes total internal reflection (TIR) at one surface. A tunable conductive layer is disposed on the TIR surface. The tunable conductive layer can have a conductivity that is dynamically controllable, e.g., by applying a voltage across the tunable conductive layer or by optically pumping the tunable conductive layer. The tunable conductive layer can absorb a portion of the reflected light beam, attenuating the beam, with the attenuation being a function of the electrical conductivity of the tunable conductive layer. The phase of the reflected light beam can also be altered as a function of electrical conductivity of the tunable conductive layer.
    Type: Grant
    Filed: May 8, 2017
    Date of Patent: February 5, 2019
    Assignee: The Chinese University of Hong Kong
    Inventors: Xudong Liu, Zefeng Chen, Edward Philip John Parrott, Benjamin Ung, Jianbin Xu, Emma MacPherson
  • Patent number: 10191204
    Abstract: Materials and lightguides formed thereof that are suitable for use in lighting units to impart a color filtering effect to visible light. At least a portion of such a lightguide (16) is formed of a composite material comprising a polymeric matrix material and an inorganic particulate material that contributes a color filtering effect to visible light passing through the composite material, and the particulate material comprises a neodymium compound containing Nd3+ ions.
    Type: Grant
    Filed: January 6, 2015
    Date of Patent: January 29, 2019
    Assignee: GE Lighting Solutions, LLC
    Inventors: Yingchun Fu, Chenjie Xu, Xiaojun Ren, Dengke Cai, Jianmin He, Matthew A. Bugenske
  • Patent number: 10046415
    Abstract: A tool and related method for removing unwanted gas hydrates from the surface of equipment used in subsea exploration and production. The tool includes a main vessel and a power cable linked together by a connector. Inside the vessel a laser device is connected to an adjustable focus collimator by a cable, with the wavelength emitted by the laser being between 200 nm and 930 nm. When the radiation reaches the subsea exploration equipment it causes the heating thereof, which in turn heats the hydrate through conduction, breaking down the hydrate formation from the inside out. The front lid of the tools includes a window fitted with anti-reflection film that forms an interface between the vessel and the aqueous medium.
    Type: Grant
    Filed: October 18, 2013
    Date of Patent: August 14, 2018
    Assignees: WSN SISTEMAS DE MONITORAMENTO LTD, ALIS SOLUÇÕES EM ENGENHARIA LTD
    Inventor: Leone Pereira Masiero
  • Patent number: 9941994
    Abstract: Methods and systems are provided for wavelength shift elimination during spectral inversion in optical networks. The method includes receiving an input optical signal, and generating a combined optical signal by combining, by Bragg scattering, the input optical signal having an input wavelength with a first pump signal having a first wavelength. The method further includes converting the combined optical signal into an output optical signal, by phase-conjugation, using a second pump signal having a second wavelength. The output optical signal has the same wavelength as the input optical signal.
    Type: Grant
    Filed: October 30, 2015
    Date of Patent: April 10, 2018
    Assignee: Fujitsu Limited
    Inventors: Kevin Croussore, Inwoong Kim, Olga I. Vassilieva, Takao Naito
  • Patent number: 9935712
    Abstract: An opto-electrical oscillator includes, in part, first and second optical phase modulators, a coupler, an optical-to-electrical signal conversion circuit, and a control circuit. The first optical phase modulator modulates the phase of a first optical signal in response to a first feedback signal to generate a first phase modulated signal. The second optical phase modulator modulates the phase of a second optical signal in response to a second feedback signal to generate a second phase modulated signal. The first and second optical signals travel through first and second optical paths respectively and are generated from the same optical source. The optical-to-electrical signal conversion circuit receives an optical signal from the coupler and in response generates an electrical signal applied to the control circuit. The output signals of the control circuit cause the first and second feedback signals to be out of phase.
    Type: Grant
    Filed: September 13, 2013
    Date of Patent: April 3, 2018
    Assignee: CALIFORNIA INSTITUTE OF TECHNOLOGY
    Inventors: Firooz Aflatouni, Behrooz Abiri, Seyed Ali Hajimiri
  • Patent number: 9882342
    Abstract: A method and system for delivering laser pulses achieves the delivery of high quality laser pulses at the location of an application. The method includes the steps of: generating laser pulses, amplifying the laser pulses, temporally stretching the amplified laser pulses, and propagating the amplified laser pulses through an optical delivery fiber of desired length, wherein the laser pulses are temporally compressed in the optical delivery fiber and wherein the laser pulses undergo nonlinear spectral broadening in the optical delivery fiber.
    Type: Grant
    Filed: April 8, 2016
    Date of Patent: January 30, 2018
    Assignee: Toptica Photonics AG
    Inventors: Armin Zach, Robert Herda
  • Patent number: 9831951
    Abstract: An opto-electrical oscillator includes, in part, first and second optical phase modulators, a coupler, an optical-to-electrical signal conversion circuit, and a control circuit. The first optical phase modulator modulates the phase of a first optical signal in response to a first feedback signal to generate a first phase modulated signal. The second optical phase modulator modulates the phase of a second optical signal in response to a second feedback signal to generate a second phase modulated signal. The first and second optical signals travel through first and second optical paths respectively and are generated from the same optical source. The optical-to-electrical signal conversion circuit receives an optical signal from the coupler and in response generates an electrical signal applied to the control circuit. The output signals of the control circuit cause the first and second feedback signals to be out of phase.
    Type: Grant
    Filed: September 13, 2013
    Date of Patent: November 28, 2017
    Assignee: CALIFORNIA INSTITUTE OF TECHNOLOGY
    Inventors: Firooz Aflatouni, Behrooz Abiri, Seyed Ali Hajimiri
  • Patent number: 9806486
    Abstract: An optical amplifier module is configured as a multi-stage free-space optics arrangement, including at least an input stage and an output stage. The actual amplification is provided by a separate fiber-based component coupled to the module. A propagating optical input signal and pump light are provided to the input stage, with the amplified optical signal exiting the output stage. The necessary operations performed on the signal within each stage are provided by directing free-space beams through discrete optical components. The utilization of discrete optical components and free-space beams significantly reduces the number of fiber splices and other types of coupling connections required in prior art amplifier modules, allowing for an automated process to create a “pluggable” optical amplifier module of small form factor proportions.
    Type: Grant
    Filed: March 17, 2016
    Date of Patent: October 31, 2017
    Assignee: II-VI Incorporated
    Inventors: Mark H. Garrett, Aravanan Gurusami, Ian Peter McClean, Nadhum Zayer, Eric Timothy Green, Mark Filipowicz, Massimo Martinelli
  • Patent number: 9778543
    Abstract: A tunable parametric mixer comprising a pump laser, a nonlinear waveguide, and a refractive index tuner. The pump laser is configured to generate pump photons. The nonlinear waveguide comprises a cladding and a core. The core is made of nonlinear optical material and the cladding in made of a material with a tunable index of refraction. The nonlinear waveguide is configured to convert the pump photons into signal and idler photons. The refractive index tuner is configured to change the refractive index of the cladding to dynamically tune the dispersion properties of the nonlinear waveguide in order to alter a spectral location of a gain band of the parametric mixer.
    Type: Grant
    Filed: December 9, 2014
    Date of Patent: October 3, 2017
    Assignee: The United States of America as represented by Secretary of the Navy
    Inventors: Sanja Zlatanovic, Joanna Ptasinski
  • Patent number: 9774161
    Abstract: A method and system for delivering laser pulses achieves the delivery of high quality laser pulses at the location of an application. The method includes the steps of: generating laser pulses, amplifying the laser pulses, temporally stretching the amplified laser pulses, and propagating the amplified laser pulses through an optical delivery fiber of desired length, wherein the laser pulses are temporally compressed in the optical delivery fiber and wherein the laser pulses undergo nonlinear spectral broadening in the optical delivery fiber.
    Type: Grant
    Filed: February 18, 2015
    Date of Patent: September 26, 2017
    Assignee: Toptica Photonics AG
    Inventors: Armin Zach, Robert Herda
  • Patent number: 9774160
    Abstract: A femtosecond laser based laser processing system having a femtosecond laser, frequency conversion optics, beam manipulation optics, target motion control, processing chamber, diagnostic systems and system control modules. The femtosecond laser based laser processing system allows for the utilization of the unique heat control in micromachining, and the system has greater output beam stability, continuously variable repetition rate and unique temporal beam shaping capabilities.
    Type: Grant
    Filed: August 27, 2015
    Date of Patent: September 26, 2017
    Assignee: IMRA AMERICA, INC.
    Inventor: Donald J. Harter
  • Patent number: 9746615
    Abstract: The light-synthesizing laser device includes a plurality of collimating lenses that are arranged in a one-to-one relationship with a plurality of laser light sources which exhibit anisotropy in a laser light emission angle, and that convert laser light beams emitted from the laser light sources into parallel light; a condensing lens that condenses the laser light that has been converted into parallel light by the plurality of collimating lenses; and an optical fiber (5) having a square waveguide core (SC) which has a square shape, the fiber receiving and synthesizing the laser light condensed by the condensing lens. A longitudinal axis of a condensed beam condensed by the condensing lens is aligned with a diagonal axis of the square waveguide core.
    Type: Grant
    Filed: June 17, 2014
    Date of Patent: August 29, 2017
    Assignee: SHIMADZU CORPORATION
    Inventors: Jiro Saikawa, Naoya Ishigaki, Shingo Uno, Tomoyuki Hiroki, Ichiro Fukushi, Akiyuki Kadoya, Junki Sakamoto, Koji Tojo, Kazuma Watanabe
  • Patent number: 9711940
    Abstract: In the field of narrow linewidth laser sources and a laser device that comprises a laser source and a waveguide of determined refractive index with which it is coupled, a waveguide is single-mode and includes at least four reflectors in the form of trenches etched into the waveguide and irregularly distributed along the waveguide, the distance separating two neighbouring reflectors being above 1 ?m, and the waveguide and the laser source have respective lengths such that the length of waveguide over which the reflectors are located is greater than the length of the laser source itself.
    Type: Grant
    Filed: December 12, 2014
    Date of Patent: July 18, 2017
    Assignee: THALES
    Inventors: Guang-Hua Duan, Frédéric Van Dijk, Gaël Kervella
  • Patent number: 9667021
    Abstract: In the method for generating blue laser light with high optical and electrical efficiency, wherein the improvement comprises the step of using a phosphate glass photonic crystal fiber rod as a gain medium.
    Type: Grant
    Filed: October 6, 2015
    Date of Patent: May 30, 2017
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventors: Daniel J. Creeden, Peter A. Ketteridge, Paul R. Moffitt, Katherine J. Snell
  • Patent number: 9627839
    Abstract: A fiber gain medium provided by a rare-earth doped fiber (10) is contained in a first resonant cavity by end reflectors (12, 18). The reflector (12) is wavelength selective to limit the frequency band of the first resonant cavity. The first resonant cavity also contains a second resonant enhancement cavity (16) with multiple transmission bands lying within the first resonant cavity's frequency band. Multiple standing wave modes of the first resonant cavity lie within both the frequency band of the first resonant cavity and the transmission bands of the second resonant cavity, and it is these standing wave modes that support laser action when the rare-earth doped fiber is suitably pumped by pump lasers (40).
    Type: Grant
    Filed: May 13, 2011
    Date of Patent: April 18, 2017
    Assignee: UNIVERSITY OF SOUTHAMPTON
    Inventors: William Andrew Clarkson, Rafal Cieslak
  • Patent number: 9553421
    Abstract: The present invention relates to compact, low noise, ultra-short pulse sources based on fiber amplifiers, and various applications thereof. At least one implementation includes an optical amplification system having a fiber laser seed source producing seed pulses at a repetition rate corresponding to the fiber laser cavity round trip time. A nonlinear pulse transformer, comprising a fiber length greater than about 10 m, receives a seed pulse at its input and produces a spectrally broadened output pulse at its output, the output pulse having a spectral bandwidth which is more than 1.5 times a spectral bandwidth of a seed pulse. A fiber power amplifier receives and amplifies spectrally broadened output pulses. A pulse compressor is configured to temporally compress spectrally broadened pulses amplified by said power amplifier. Applications include micro-machining, ophthalmology, molecular desorption or ionization, mass-spectroscopy, and/or laser-based, biological tissue processing.
    Type: Grant
    Filed: October 16, 2013
    Date of Patent: January 24, 2017
    Assignee: IMRA AMERICA, INC.
    Inventor: Martin E. Fermann
  • Patent number: 9513441
    Abstract: A method for manufacturing a polarizing splitter includes providing a substrate including a top surface; forming a ridged asymmetric Y-shaped waveguide and a base by etching the substrate from the top surface into an inner region, the base includes an upper surface paralleling with the top surface, the ridged asymmetric Y-shaped waveguide projects from the upper surface of the base, and includes an input section configured for transmitting both a transverse electric wave and a transverse magnetic wave, a first branch configured for transmitting the transverse magnetic wave only, and a second branch configured for transmitting the transverse electric wave only, the first and the second branches branch from the input section; and forming a pair of strip-shaped first electrodes on the upper surface of the base, the strip-shaped first electrodes arranged at opposite sides of the input section and parallel with a central axis of the input section.
    Type: Grant
    Filed: February 1, 2016
    Date of Patent: December 6, 2016
    Assignee: HON HAI PRECISION INDUSTRY CO., LTD.
    Inventor: Hsin-Shun Huang
  • Patent number: 9235105
    Abstract: The present invention provides a tunable optical frequency converter based on a phase modulator, which comprises a laser, a first optical isolator and a circulating frequency shift module. Said circulating frequency shift module is composed of an optical coupler, a phase modulator, an optical amplifier, a second optical isolator, a first optical circulator, an optical fiber Bragg grating, a second optical circulator, a tunable filter and a tunable attenuator. Light outputted by said laser is inputted to said circulating frequency shift module to conduct frequency converting repeatedly after passing through the first optical isolator, and then separated by a tunable filter and a second optical circulator, then the frequency converted light is outputted from the port of the circulating frequency shift module.
    Type: Grant
    Filed: October 24, 2012
    Date of Patent: January 12, 2016
    Assignee: SHENZHEN UNIVERSITY
    Inventors: Zhengbiao Ouyang, Chunchao Qi
  • Patent number: 9048625
    Abstract: Normal group velocity dispersion mode-locked optical frequency combs are provided on-chip. On-chip coherent frequency comb generation includes pulses showing temporal durations of about 74 fs. Pump detuning and bandpass filtering are provided for stabilizing and shaping the pulses from normal group velocity dispersion microresonators.
    Type: Grant
    Filed: July 29, 2014
    Date of Patent: June 2, 2015
    Assignee: THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORK
    Inventors: Heng Zhou, Shu-Wei Huang, Chee Wei Wong
  • Patent number: 9042003
    Abstract: A frequency comb generator fabricated on a chip with elimination of a disadvantageous reflow process, includes an ultra-high Q disk resonator having a waveguide that is a part of a wedge structure fabricated from a silicon dioxide layer of the chip. The disk resonator allows generation of a frequency comb with a mode spacing as low as 2.6 GHz and up to 220 GHz. A surface-loss-limited behavior of the disk resonator decouples a strong dependence of pumping threshold on repetition rate.
    Type: Grant
    Filed: October 13, 2014
    Date of Patent: May 26, 2015
    Assignee: California Institute of Technology
    Inventors: Jiang Li, Hansuek Lee, Tong Chen, Kerry Vahala
  • Patent number: 9007677
    Abstract: A wavelength conversion element includes a core formed of a ferroelectric crystal having a periodically poled structure in which first and second domains having mutually inverted directions of spontaneous polarization are alternately aligned side by side, and a cladding covering all side surfaces of the core along a light propagation direction and having a uniform refractive index. Boundary surfaces of the first and second domains are arranged in a non-parallel manner with respect to the light propagation direction.
    Type: Grant
    Filed: July 18, 2013
    Date of Patent: April 14, 2015
    Assignee: Oki Electric Industry Co., Ltd.
    Inventor: Tadashi Kishimoto
  • Patent number: 9008132
    Abstract: A pulsed laser system may include a Raman fiber that is configured to act as multiple wavelength Raman laser. The fiber is configured to receive a pulsed input beam from an input source and convert the input beam to an output beam having narrow band outputs at first and second frequencies v1 and v2.
    Type: Grant
    Filed: April 20, 2011
    Date of Patent: April 14, 2015
    Assignee: IPG Photonics Corporation
    Inventors: Gregory L. Keaton, Manuel J. Leonardo, Mark W. Byer, Kiyomi Monro
  • Publication number: 20150029579
    Abstract: A frequency comb generator fabricated on a chip with elimination of a disadvantageous reflow process, includes an ultra-high Q disk resonator having a waveguide that is a part of a wedge structure fabricated from a silicon dioxide layer of the chip. The disk resonator allows generation of a frequency comb with a mode spacing as low as 2.6 GHz and up to 220 GHz. A surface-loss-limited behavior of the disk resonator decouples a strong dependence of pumping threshold on repetition rate.
    Type: Application
    Filed: October 13, 2014
    Publication date: January 29, 2015
    Inventors: Jiang LI, Hansuek LEE, Tong CHEN, Kerry VAHALA
  • Patent number: 8917443
    Abstract: It is provided a wavelength converting device comprising a periodic domain inversion structure for converting a wavelength of a fundamental wave to generate a harmonic wave. The wavelength conversion device includes a ferroelectric substrate and the periodic domain inversion structure formed in the ferroelectric substrate. A vertical domain inversion boundary of the periodic domain inversion structure is inclined with respect to a normal line of an upper face of the ferroelectric substrate, provided that the ferroelectric substrate is viewed in a cross section parallel with a propagating direction of the fundamental wave and parallel with the normal line of the upper face.
    Type: Grant
    Filed: December 31, 2013
    Date of Patent: December 23, 2014
    Assignee: NGK Insulators, Ltd.
    Inventors: Minori Tani, Keiichiro Asai, Shoichiro Yamaguchi
  • Patent number: 8917444
    Abstract: A frequency comb generator fabricated on a chip with elimination of a disadvantageous reflow process, includes an ultra-high Q disk resonator having a waveguide that is a part of a wedge structure fabricated from a silicon dioxide layer of the chip. The disk resonator allows generation of a frequency comb with a mode spacing as low as 2.6 GHz and up to 220 GHz. A surface-loss-limited behavior of the disk resonator decouples a strong dependence of pumping threshold on repetition rate.
    Type: Grant
    Filed: June 15, 2012
    Date of Patent: December 23, 2014
    Assignee: California Institute of Technology
    Inventors: Jiang Li, Hansuek Lee, Tong Chen, Kerry Vahala
  • Patent number: 8873133
    Abstract: A system for conversion or amplification using quasi-phase matched four-wave-mixing includes a first radiation source for providing a pump radiation beam, a second radiation source for providing a signal radiation beam, and a bent structure for receiving the pump radiation beam and the signal radiation beam. The radiation propagation portion of the bent structure is made of a uniform Raman-active or uniform Kerr-nonlinear material and the radiation propagation portion comprises a dimension taking into account the spatial variation of the Raman susceptibility or Kerr susceptibility along the radiation propagation portion as experienced by radiation travelling along the bent structure for obtaining quasi-phase-matched four-wave-mixing in the radiation propagation portion. The dimension thereby is substantially inverse proportional with the linear phase mismatch for four-wave-mixing.
    Type: Grant
    Filed: October 4, 2010
    Date of Patent: October 28, 2014
    Assignee: Vrije Universiteit Brussel
    Inventors: Nathalie Vermeulen, John Edward Sipe, Hugo Jean Arthur Thienpont
  • Patent number: 8854725
    Abstract: A wavelength conversion element disclosed in the present application includes a phosphor layer including a plurality of phosphor particles and a matrix that is located among the plurality of phosphor particles and is formed of zinc oxide. The zinc oxide is columnar crystals or a single crystal in a c-axis orientation.
    Type: Grant
    Filed: November 4, 2013
    Date of Patent: October 7, 2014
    Assignee: Panasonic Corporation
    Inventors: Takahiro Hamada, Nobuyasu Suzuki, Kenji Orita, Nobuaki Nagao
  • Patent number: 8820968
    Abstract: A method of manufacturing a wavelength conversion element can control a formation process of a polarization inversion structure with single crystalline magnesium-doped lithium niobate having a congruent composition, and can stably manufacture wavelength conversion elements having high conversion efficiency. The method involves forming periodic electrodes on the +z face of an MgLN substrate and forming an opposite electrode on the ?z face of the MgLN substrate; heat-treating the substrate after forming the periodic electrodes and the opposite electrode; and applying a pulsed electric field between the periodic electrodes and the opposite electrode while holding the MgLN substrate at a temperature of 100° C. or higher. The wavelength conversion element has a polarization inversion structure formed by applying an electric field to a heat-treated MgLN substrate.
    Type: Grant
    Filed: October 10, 2012
    Date of Patent: September 2, 2014
    Assignee: Panasonic Corporation
    Inventor: Hiroyuki Furuya
  • Patent number: 8817363
    Abstract: A wavelength conversion device includes a base substrate having a transparent electrode on one surface thereof and a ferroelectric single crystal substrate provided with an optical waveguide. The ferroelectric single crystal substrate has an insulating film formed on one surface and is bonded to the base substrate such that the insulating film faces the transparent electrode.
    Type: Grant
    Filed: August 24, 2010
    Date of Patent: August 26, 2014
    Assignee: Citizen Holdings Co., Ltd.
    Inventors: Gakuji Anzai, Masafumi Ide
  • Patent number: 8787757
    Abstract: An optical communication network includes a plurality of optical transmission devices, a communication path, an optical repeater, and a supervisory controller that includes a supervisory control information sender which is installed on at least one of one of the optical transmission devices and the optical repeater and controls a drive signal supplied to a semiconductor optical amplifier that amplifies and outputs input signal light onto the communication path on the basis of the supervisory control information, and a supervisory control information receiver that receives the light which has been output from a semiconductor optical amplifier and transmitted through the communication path, converts the received light to an electric signal and identifies the supervisory control information on the basis of an intensity-modulated component of the total power of the electric signal in at least the other of one of the optical transmission devices and the optical repeater.
    Type: Grant
    Filed: November 15, 2010
    Date of Patent: July 22, 2014
    Assignee: Fujitsu Limited
    Inventor: Yutaka Kai
  • Patent number: 8749874
    Abstract: An optical integration circuit includes a semiconductor optical amplifier (SOA), a readout mechanism coupled to the SOA, and an optical filter coupled to an output of the SOA. The SOA has a decaying response function and an input for receiving an optical input signal having a first wavelength. The SOA is configured to output an optical signal representing a temporal integration of the optical input signal. The readout mechanism provides an optical readout signal having a second wavelength to the SOA for measuring a state of the SOA. The optical filter is configured to receive the signal representing the temporal integration of the optical input signal and block optical signals having the first wavelength.
    Type: Grant
    Filed: March 10, 2010
    Date of Patent: June 10, 2014
    Assignees: Lockheed Martin Corporation, The Trustees of Princeton University
    Inventors: David Rosenbluth, Paul R. Prucnal, Konstantin Kravtsov
  • Patent number: 8731404
    Abstract: An optical transmission system is provided. The optical transmission system includes a user side optical repeater device (ORD), a central office side ORD, and wavelength multiplexing and wavelength de-multiplexing functions (MUX/DEMUX). The user side optical repeater device (ORD) is to be connected with a user side optical network unit (ONU), transmits data in two ways, and is used for wavelength division multiplexing (WDM). The central office side ORD is to be connected with a central office side optical line terminal (OLT), transmits data in two ways, and is used for WDM. The wavelength multiplexing and a wavelength de-multiplexing functions (MUX/DEMUX), are used for relaying between the user side ORD and the central office side ORD.
    Type: Grant
    Filed: November 30, 2012
    Date of Patent: May 20, 2014
    Assignee: Furukawa Electric Co., Ltd.
    Inventor: Masayuki Miura
  • Patent number: 8708901
    Abstract: A health monitoring system includes a waveguide that receives a wave transmitted from an external power source and that guides the wave to reach within a width of a rectenna. The waveguide may include a negative refractive index medium and/or a surface plasmon medium.
    Type: Grant
    Filed: December 30, 2009
    Date of Patent: April 29, 2014
    Assignee: University of Seoul Industry Cooperation Foundation
    Inventor: Doyeol Ahn
  • Patent number: 8698399
    Abstract: A method of sustaining a plasma, by focusing a first wavelength of electromagnetic radiation into a gas within a volume, where the first wavelength is substantially absorbed by a first species of the gas and delivers energy into a first region of a plasma having a first size and a first temperature. A second wavelength of electromagnetic radiation is focused into the first region of the plasma, where the second wavelength is different than the first wavelength and is substantially absorbed by a second species of the gas and delivers energy into a second region of the plasma region within the first region of the plasma having a second size that is smaller than the first size and a second temperature that is greater than the first temperature.
    Type: Grant
    Filed: February 12, 2010
    Date of Patent: April 15, 2014
    Assignee: KLA-Tencor Corporation
    Inventors: Ilya V. Bezel, Anatoly Shchemelinin, Eugene Shifrin, Matthew W. Derstine, Richard W. Solarz
  • Patent number: 8693835
    Abstract: A method for transferring a thin layer from a lithium-based first substrate includes proton exchange between the first substrate and a first electrolyte, which is an acid, through a free face of the first substrate so as to replace lithium ions of the first substrate by protons, in a proportion between 10% and 80%, over a first depth e1. A reverse proton exchange between the first substrate and a second electrolyte, through the free face is carried out so as to replace substantially all the protons with lithium ions over a second depth e2 smaller than the first depth e1, and so as to leave an intermediate layer between the depths e1 and e2, in which intermediate layer protons incorporated during the proton exchange step remain. The depth e2 defines a thin layer between the free face and the intermediate layer. A heat treatment is carried out under conditions suitable for embrittling the intermediate layer and the thin film is separated from the first substrate at the intermediate layer.
    Type: Grant
    Filed: April 10, 2009
    Date of Patent: April 8, 2014
    Assignees: Commissariat a l'Energie Atomique et aux Energies Alternatives, S.O.I. Tec Silicon on Insulator Technologies
    Inventors: Aurélie Tauzin, Jean-Sébastien Moulet
  • Patent number: 8642982
    Abstract: A fast switching arbitrary frequency light source for broadband spectroscopic applications. The light source may operate near 1.6 um based on sideband tuning using an electro-optic modulator driven by an arbitrary waveform generator. A Fabry-Perot filter cavity selects a single sideband of the light source. The finesse (FSR/??FWHM) of the filter cavity may be chosen to enable rapid frequency switching at rates up to 5 MHz over a frequency range of 40 GHz (1.3 cm?1). The bandwidth, speed and spectral purity are high enough for spectroscopic applications where rapid and discrete frequency scans are needed. Significant signal-to-noise advantages may be realized using the rapid and broadband scanning features of this system in many areas of spectroscopy, e.g., process monitoring and control, reaction dynamics, and remote sensing (e.g., greenhouse gas monitoring, biological/chemical agent screening).
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: February 4, 2014
    Assignee: The United States of America, as represented by the Secretary of Commerce, NIST
    Inventors: David F. Plusquellic, Kevin O. Douglass, Stephen E. Maxwell, Joseph T. Hodges, David A. Long, Gar-Wing Truong
  • Patent number: 8642984
    Abstract: According to the present invention, an electromagnetic wave emission device includes a nonlinear crystal having an optical waveguide; and a prism including an electromagnetic wave input surface and an electromagnetic wave transmission surface. The electromagnetic wave transmission surface includes a rotation surface which is a trajectory of a tilted line segment rotated about a central axis of the electromagnetic wave input surface, the tilted line segment being tilted with respect to the central axis. The tilted line segment and the central axis are on the same plane. The central axis is in parallel to an extending direction of the optical waveguide. The central axis passes through a projection of the optical waveguide into the electromagnetic wave input surface.
    Type: Grant
    Filed: April 15, 2013
    Date of Patent: February 4, 2014
    Assignee: Advantest Corporation
    Inventors: Kazunori Shiota, Akiyoshi Irisawa
  • Patent number: 8642983
    Abstract: An electromagnetic wave emission device includes a nonlinear crystal, a prism, and a cylindrical lens. The nonlinear crystal has an optical waveguide, receives exciting light having at least two wavelength components, and outputs an electromagnetic wave having a frequency equal to or more than 0.01 [THz] and equal to or less than 100 [THz] by means of the Cherenkov phase matching. The prism includes an electromagnetic wave input surface receiving the electromagnetic wave from the optical waveguide and an electromagnetic wave transmission surface through which the electromagnetic wave which has entered from the electromagnetic wave input surface passes. The cylindrical lens has two bottom surfaces opposed to each other, a flat surface intersecting with the two bottom surfaces, and a curved surface intersecting with the two bottom surfaces and the flat surface, wherein the flat surface is in contact with the electromagnetic wave transmission surface.
    Type: Grant
    Filed: September 11, 2012
    Date of Patent: February 4, 2014
    Assignee: Advantest Corporation
    Inventor: Kazunori Shiota
  • Patent number: 8619356
    Abstract: A new method for making a nonlinear optical structure for frequency conversion and for using that structure for frequency conversion is described. The nonlinear optical structure is made by depositing alternating contiguous layers of gallium arsenide and aluminum gallium arsenide onto a gallium arsenide substrate. Optical frequency conversion is performed by transmitting a pump laser beam through the structure. The new method is easier to perform than prior art methods.
    Type: Grant
    Filed: March 7, 2012
    Date of Patent: December 31, 2013
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: David Weyburne, David Bliss, Candace Lynch
  • Patent number: 8571076
    Abstract: A laser light source includes a fundamental laser generator that generates a fundamental laser light, a wavelength conversion element that is made of a ferroelectric crystal with a periodically poled structure and converts the fundamental laser light to a laser light having a different wavelength, a holding member that holds at least a part of an element surface of the wavelength conversion element that crosses a polarization direction of the periodically poled structure, and an insulation layer that is provided between the holding member and the element surface. Electric resistivity of the insulation layer is 1×108 ?·cm or higher.
    Type: Grant
    Filed: March 26, 2009
    Date of Patent: October 29, 2013
    Assignee: Panasonic Corporation
    Inventors: Koichi Kusukame, Hiroyuki Furuya, Kiminori Mizuuchi, Tomoya Sugita, Akihiro Morikawa, Nobuyuki Horikawa, Kazuhisa Yamamoto, Shinichi Kadowaki
  • Patent number: 8542434
    Abstract: An optical waveguide device includes a ferroelectric layer having a thickness of 4 ?m-7 ?m; a supporting body; and an adhesive layer adhering a bottom face of the ferroelectric layer and supporting body. The ferroelectric layer includes a ridge comprising a channel optical waveguide, first and second protuberances on opposite sides of the ridge, inner grooves between the ridge and protuberances, respectively, and outer grooves outside of the protuberances, respectively. The outer groove is deeper than the inner groove. The ridge portion has a width of 6.6 ?m-8.5 ?m, a distance of an outer edge of the first protuberance and an outer edge of the second protuberance is 8.6 ?m-20 ?m, the inner groove has a depth of 2.0 ?m-2.9 ?m, and the outer groove has a depth of 2.5 ?m-3.5 ?m.
    Type: Grant
    Filed: August 29, 2011
    Date of Patent: September 24, 2013
    Assignee: NGK Insulators, Ltd.
    Inventors: Jungo Kondo, Tetsuya Ejiri, Yuichi Iwata, Shoichiro Yamaguchi, Taku Nishigaki
  • Patent number: 8519803
    Abstract: Tunable resonator systems and methods for tuning resonator systems are disclosed. In one aspect, a resonator system includes an array of resonators disposed adjacent to a waveguide, at least one temperature sensor located adjacent to the array of resonators, and a resonator control electronically connected to the at least one temperature sensor. Each resonator has a resonance frequency in a resonator frequency comb and channels with frequencies in a channel frequency comb are transmitted in the waveguide. Resonance frequencies in the resonator frequency comb are to be adjusted in response to ambient temperature changes detected by the at least one temperature sensors to align the resonance frequency comb with the channel frequency comb.
    Type: Grant
    Filed: October 29, 2010
    Date of Patent: August 27, 2013
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Moray McLaren, Raymond G. Beausoleil, Marco Fiorentino, Nathan Lorenzo Binkert, Norman Paul Jouppi, Alan Lynn Davis
  • Patent number: 8515290
    Abstract: The invention relates to a method for coupling a first and second laser (1, 2) having an adjustable difference of their pulse frequencies, which is not equal to zero, wherein the method comprises the following steps: derivation of a first harmonic signal and a signal of the Mth harmonic from the time progression of the light intensity of the pulses emitted by the first laser, mixing of the first harmonic signal and the signal of the Mth harmonic, in order to obtain a first mixed signal, derivation of a second harmonic signal and a signal of the Nth harmonic from the time progression of the light intensity of the pulses emitted by the second laser, mixing of the second harmonic signal and the signal of the Nth harmonic, in order to obtain a second mixed signal, wherein the first and second harmonic signal and the Mth and Nth harmonic are selected in such a manner that the frequencies of the first and second mixed signal are identical, wherein the method furthermore comprises regulation of the pulse frequen
    Type: Grant
    Filed: September 14, 2010
    Date of Patent: August 20, 2013
    Assignee: Giga Optics GmbH
    Inventors: Albrecht Bartels, Raphael Gebs
  • Patent number: 8514482
    Abstract: A terahertz electromagnetic wave generating element can include a generation layer, and a plurality of pairs of layer structures provided on opposite sides thereof. The layer structures are each provided with a first layer, a second layer on the side of the first layer opposite to the generation layer, and a first grating and a second grating, and having a grating period smaller than the wavelength of the terahertz electromagnetic wave to be used. The first and second gratings are configured so that the refractive index of a medium between the first layer and the second layer continuously varies between a first refractive index and a second refractive index. The thickness of the first and second layers and the grating period, and the grating height are determined so that a terahertz electromagnetic wave having a desired bandwidth with respect to a central wavelength of the terahertz electromagnetic wave generated by the generation layer can be generated.
    Type: Grant
    Filed: October 13, 2011
    Date of Patent: August 20, 2013
    Assignee: Nalux Co., Ltd.
    Inventor: Masato Okano
  • Patent number: 8508840
    Abstract: A device for reducing time distortion generated in light pulses by an optical frequency converter including at least one nonlinear optical component (4) having a nonlinear optical susceptibility ? of about 2 or 3, the converter being capable of receiving at least one incident pulse light beam (2), the incident light pulses having a duration ?t0, an optical frequency ?0±??0 and an intensity I0(t), and of generating, by frequency conversion, at least one output pulse beam (3), the output light pulses having a duration ?t1, an optical frequency ?1±??1 different from ?0±??0, and an intensity I1(t). The time distortion-reducing device includes a pre-compensation linear time filter (5) provided on the path of the incident beam (2), and capable of reducing the intensity time distortions generated in the frequency-converted output light pulses to at least one pre-compensation intensity Icomp.
    Type: Grant
    Filed: December 21, 2009
    Date of Patent: August 13, 2013
    Assignee: Commissariat a l'Energie Atomique et aux Energies Alternatives
    Inventors: Steve Hocquet, Denis Penninckx, Claude Gouedard
  • Patent number: 8508839
    Abstract: A system and method for improving conversion efficiency of a difference frequency generator (DFG) and/or for outputting a desired shape of the output signal, where the method includes providing a pump source, modifying the pump pulse temporal shape for optimal DFG conversion efficiency, and providing the modified pump pulse to the DFG. The pump source may be, for example, a MOPA laser or a diode or any other suitable source. In one embodiment, the pump pulse shape is modified such that an initial gain within the DFG is high, followed by a lower level signal for efficient conversion within the DFG. An example of such a shape is a double square pulse. Other configurations are possible as well such as a single rectangular pulse shape.
    Type: Grant
    Filed: September 15, 2009
    Date of Patent: August 13, 2013
    Assignees: Ramot At Tel-Aviv University Ltd., Elbit Systems Electro-Optics Elop Ltd.
    Inventors: Zachary Sacks, Ady Arie, Ofer Gayer
  • Patent number: RE45177
    Abstract: Use of quasi-phase-matched (QPM) materials for parametric chirped pulse amplification (PCPA) substantially reduces the required pump peak power and pump brightness, allowing exploitation of spatially-multimode and long duration pump pulses. It also removes restrictions on pump wavelength and amplification bandwidth. This allows substantial simplification in pump laser design for a high-energy PCPA system and, consequently, the construction of compact diode-pumped sources of high-energy ultrashort optical pulses. Also, this allows elimination of gain-narrowing and phase-distortion limitations on minimum pulse duration, which typically arise in a chirped pulse amplification system. One example of a compact source of high-energy ultrashort pulses is a multimode-core fiber based PCPA system. Limitations on pulse energy due to the limited core size for single-mode fibers are circumvented by using large multimode core.
    Type: Grant
    Filed: March 26, 2003
    Date of Patent: October 7, 2014
    Assignee: IMRA America, Inc.
    Inventors: Almantas Galvanauskas, Donald Harter, Gregg Sucha