Light Intensity Dependent (e.g., Nonlinear Effects) Patents (Class 385/5)
  • Patent number: 11002995
    Abstract: A fringe projector apparatus includes: a phase modulator having a first waveguide, a second waveguide, and a plurality of heaters including a first heater and a second heater, wherein the first and second waveguides and the plurality of heaters are provided on a single substrate, and wherein the first heater heats the first waveguide and the second heater heats a position away from the first waveguide; a light source that generates a light beam to be input to the first waveguide and the second waveguide; and a controller that controls a phase difference between the first waveguide and the second waveguide by changing an electric power consumption of the first heater under a condition that a total electric power consumption of the plurality of heaters is constant.
    Type: Grant
    Filed: July 16, 2019
    Date of Patent: May 11, 2021
    Assignees: OLYMPUS CORPORATION, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Daichi Watanabe, Satomi Katayose, Kei Watanabe, Yu Kurata, Ryoichi Kasahara
  • Patent number: 10633353
    Abstract: It is an object of the present invention to provide a polymerizable compound having a good liquid crystal property, a good alignment property, sufficient solubility in solvents, high preservation stability in a solution state, and high optical stability; a composition including the polymerizable compound; a polymer produced by polymerizing the polymerizable compound, such as a resin produced using the polymerizable compound; an optically anisotropic body including the polymer; and a liquid crystal display element and an organic EL device that include the optically anisotropic body. As a result of conducting intensive studies in order to achieve the above object, the compound represented by General Formula (I) is developed.
    Type: Grant
    Filed: December 1, 2015
    Date of Patent: April 28, 2020
    Assignee: DIC CORPORATION
    Inventors: Sayaka Nose, Yuji Ohashi, Junichi Mamiya, Akihiro Koiso, Tatsufumi Yamazaki
  • Patent number: 10539742
    Abstract: A PhC all-optical multistep-delay self-OR-transformation logic gate including an optical switch unit, a PhC structure unit, a reference-light, a memory or delayer, a D-type flip-flop unit and a wave absorbing load; a logic signal X is connected to the input port of a two-branch waveguide whose two output ports are respectively connected with the input port of the memory and the logic-signal input port of the optical switch unit; the output port of the memory is connected with the delay-signal input port of the optical switch unit; the reference-light source is connected with the reference-light input port of the optical switch unit whose three intermediate-signal output ports are respectively connected with the first and second intermediate-signal input ports of the PhC structure unit and the wave absorbing load; and the output port of the PhC structure unit is connected with the D-signal input port of the D-type flip-flop unit.
    Type: Grant
    Filed: June 19, 2017
    Date of Patent: January 21, 2020
    Assignee: SHENZHEN UNIVERSITY
    Inventor: Zhengbiao Ouyang
  • Patent number: 10068593
    Abstract: A slider configured for heat-assisted magnetic recording has an upper surface, an opposing air bearing surface (ABS), and a body defined between the upper surface and the ABS. The slider comprises a write pole and a near-field transducer (NFT) at or near the ABS. An optical waveguide is configured to receive light from a laser source and comprises a first cladding layer, a second cladding layer, and a core between the first and second cladding layers. The core has a width, a length, and a longitudinal axis oriented along the length of the core. A bolometer is situated within the body of the slider at a location that receives at least some of the light communicated along the waveguide used during a writing operation. The bolometer is spaced apart from the core and comprises a longitudinal axis that is oriented substantially parallel to the longitudinal axis of the core.
    Type: Grant
    Filed: January 10, 2018
    Date of Patent: September 4, 2018
    Assignee: Seagate Technology LLC
    Inventors: James Gary Wessel, Chen Wang
  • Patent number: 9971228
    Abstract: In one aspect, a device for generating triplet photons is disclosed, which includes a waveguide extending from a proximal end for receiving pump radiation to a distal end through which triplet photons generated via nonlinear interaction of the pump radiation with the waveguide exit the waveguide, where the waveguide is configured such that the triplet photons generated within the waveguide reach its distal end at a rate in a range of about 0.05 triplet photons/second/mW and 0.3 triplet photons/second/mW, e.g., in a range of about 0.1 triplet photons/second/mW to about 0.2 triplet photons/second/mW.
    Type: Grant
    Filed: April 15, 2016
    Date of Patent: May 15, 2018
    Assignee: President And Fellows of Harvard College
    Inventors: Eric Mazur, Christopher Courtney Evans, Michael Gerhard Moebius, Orad Reshef, Sarah E. Griesse-Nascimento
  • Patent number: 9470956
    Abstract: The present teachings are generally directed to devices and methods for triplet photons generations, and in particular to on-chip integrated sources for generating direct triplet entangled photons.
    Type: Grant
    Filed: October 31, 2014
    Date of Patent: October 18, 2016
    Assignee: President And Fellows Of Harvard College
    Inventors: Eric Mazur, Christopher Courtney Evans, Michael Gerhard Moebius, Orad Reshef, Sarah E. Griesse-Nascimento
  • Patent number: 9207403
    Abstract: The present invention relates to a total reflection type optical switch using polymer insertion type silica optical waveguides and a manufacturing method thereof. The total reflection type optical switch forms a trench in an intersecting point of the silica optical waveguides having two optic routes, and inserts a polymer into the trench. A total reflection type optical switch has a heater which heats the polymer. The polymer is made of thermo-optic material, and totally reflects an optical signal as a refraction index falls when heated by the heater. In addition, when not heated by the heater, the polymer transilluminates the optical signal. When the polymer is made of electric-optic material, the total reflection type optical switch may have upper and lower electrodes for applying an electric field in the polymer instead of the heater.
    Type: Grant
    Filed: October 25, 2011
    Date of Patent: December 8, 2015
    Assignee: Photonics Planar Integration Technology, Inc.
    Inventors: Young Sic Kim, Jang-Uk Shin, Hyung-Myung Moon, Jin-Bong Kim
  • Patent number: 9083457
    Abstract: Light escaping from an optical path, for example via Raman or Rayleigh scattering, can provide information about how light flows in the path, about the optical path, or about matter disposed in the optical path. The path can be a waveguide, an optical channel, or a fiber that may be attached to or integrated with a substrate, for example in a passive or active planar lightguide/lightwave circuit, photonic integrated circuit, semiconductor laser, or optoelectronic element. The escaped light can be color-shifted with respect to the primary light flowing along the path. The escaped light can leave the path at an angle that facilitates detection. Processing or analyzing the scattered light, for example with support of a computing device, can help evaluate the path and/or assess a light intensity pattern thereof, for example to aid design, engineering, testing, qualification, troubleshooting, inspection, manufacturing, etc.
    Type: Grant
    Filed: February 11, 2012
    Date of Patent: July 14, 2015
    Assignee: CIRREX SYSTEMS, LLC
    Inventor: Michael L. Wach
  • Patent number: 9002146
    Abstract: An object of the present invention is to realize an optical gate switch of a monolithic integration type which can avoid problems of losses caused by light coupling of a phase modulation unit to a interferometer optical circuit unit, and can be minimized by integration. The optical gate switch according to the present invention includes an optical waveguide wafer in which a quantum well having a phase modulation effect which is generated by an intersubband transition is set as a core layer; a Michelson interferometer formed on the optical waveguide wafer; and a variable light intensity attenuation unit adjusting a light balance of an interferometer in one of reflection side arms of the Michelson interferometer reflection.
    Type: Grant
    Filed: February 15, 2012
    Date of Patent: April 7, 2015
    Assignee: National Institute of Advanced Industrial Science and Technology
    Inventors: Ryouichi Akimoto, Shinichirou Gozu, Teruo Mozume, Hiroshi Ishikawa
  • Patent number: 9002143
    Abstract: A tunable Radio Frequency (RF) filter device includes a tunable optical source configured to generate an optical carrier signal, and a modulator coupled to the tunable optical source and configured to modulate the optical carrier signal with an RF input signal. The tunable RF filter device may also include first and second optical waveguides coupled to the modulator and having first and second dispersion slopes of opposite sign, and an optical-to-electrical converter coupled to the first and second optical waveguides and configured to generate an RF output signal with a frequency notch therein based upon the tunable optical source.
    Type: Grant
    Filed: September 17, 2014
    Date of Patent: April 7, 2015
    Assignee: Harris Corporation
    Inventors: Richard Desalvo, Charles Franklin Middleton, IV
  • Patent number: 8983242
    Abstract: According to one embodiment of the invention, a plasmonic device has a beam splitter adapted to split a surface-plasmon (SP) input beam into first and second SP beams and direct them along first and second propagation paths, respectively. One of the propagation paths has a plasmonic-beam interaction region adapted to controllably change the phase of the corresponding split beam within that interaction region in response to an SP control signal applied thereto. The plasmonic device further has an SP beam mixer adapted to receive the first and second beams from their respective propagation paths and to mix them to produce an SP output signal. In various configurations, the plasmonic device can operate as a plasmonic-signal amplifier, a plasmonic-beam router, a 1×2 plasmonic-beam switch, and/or a plasmonic modulator.
    Type: Grant
    Filed: January 31, 2008
    Date of Patent: March 17, 2015
    Assignee: Alcatel Lucent
    Inventors: Girsh Blumberg, Benard Yurke
  • Patent number: 8978237
    Abstract: A method to align an optical device optically with an interference device is disclosed. The method includes steps of: selecting one of arm waveguides, biasing rest of arm waveguides to cause optical absorption thereat, and aligning the optical device optically with the selected arm waveguide.
    Type: Grant
    Filed: August 30, 2012
    Date of Patent: March 17, 2015
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Tohru Watanabe
  • Patent number: 8971671
    Abstract: A tunable Radio Frequency (RF) filter device includes a tunable optical source generating an optical carrier signal, and a modulator coupled to the tunable optical source and modulating the optical carrier signal with an RF input signal. The tunable RF filter device may include first and second optical waveguide paths coupled to the modulator and having first and second dispersion slopes of opposite sign from each other, one or more of the first and second optical waveguide paths comprising an optical splitter and combiner pair therein, and an optical-to-electrical converter coupled to the first and second optical waveguide paths and generating an RF output signal with a frequency notch therein based upon the tunable optical source.
    Type: Grant
    Filed: July 25, 2011
    Date of Patent: March 3, 2015
    Assignee: Harris Corporation
    Inventors: Richard DeSalvo, Charles Middleton
  • Publication number: 20150023628
    Abstract: Compact laser systems are disclosed which include ultrafast laser sources in combination with nonlinear crystals or waveguides. In some implementations fiber based mid-IR sources producing very short pulses and/or mid-IR sources based on a mode locked fiber lasers are utilized. A difference frequency generator receives outputs from the ultrafast sources, and generates an output including a difference frequency. The output power from the difference frequency generator can further be enhanced via the implementation of large core dispersion shifted fibers. Exemplary applications of the compact, high brightness mid-IR light sources include medical applications, spectroscopy, ranging, sensing and metrology.
    Type: Application
    Filed: October 7, 2014
    Publication date: January 22, 2015
    Applicant: IMRA AMERICA, INC.
    Inventors: Martin E. FERMANN, Ingmar HARTL
  • Patent number: 8897607
    Abstract: A tunable Radio Frequency (RF) filter device includes a tunable optical source configured to generate an optical carrier signal, and a modulator coupled to the tunable optical source and configured to modulate the optical carrier signal with an RF input signal. The tunable RF filter device may also include first and second optical waveguides coupled to the modulator and having first and second dispersion slopes of opposite sign, and an optical-to-electrical converter coupled to the first and second optical waveguides and configured to generate an RF output signal with a frequency notch therein based upon the tunable optical source.
    Type: Grant
    Filed: July 25, 2011
    Date of Patent: November 25, 2014
    Assignee: Harris Corporation
    Inventors: Richard DeSalvo, Charles Middleton
  • Publication number: 20140334766
    Abstract: Embodiments of the present invention generally relate to optical mode conversion by nonlinear effects. More specifically, embodiments of the present invention relate to nonlinear mode conversion utilizing intermodal four-wave mixing to convert light between modes having different wavelengths for complex applications. In one embodiment of the present invention, a fiber comprises an input end for receiving light in a first mode at a first wavelength, and an output end for outputting light in a desired second mode at a desired second wavelength, wherein the first wavelength and the second wavelength are not the same. In many embodiments, the fiber comprises a higher-order mode fiber.
    Type: Application
    Filed: December 6, 2012
    Publication date: November 13, 2014
    Inventors: Lars Gruner-Nielsen, Dan P Jakobsen, Martin E.V. Pedersen, Chris Xu, Ji Cheng
  • Patent number: 8729459
    Abstract: An apparatus for optical signal detection may include a housing in which a channel may be defined to receive an optical fiber in a bent configuration. The channel may have a predetermined radius of curvature to cause optical energy to escape from the fiber when an optical signal is being conveyed in the fiber and be detected at a photodetector arranged at the predetermined radius of curvature.
    Type: Grant
    Filed: March 24, 2011
    Date of Patent: May 20, 2014
    Assignee: Conolog Corporation
    Inventors: Marc Benou, Shirley J. Fogg
  • Patent number: 8705898
    Abstract: Some embodiments of the disclosed subject matter provide systems, devices, and methods for tuning resonant wavelengths of an optical resonator. Some embodiments of the disclosed subject matter provide systems, devices, and methods for tuning dispersion properties of photonic crystal waveguides. In some embodiments, methods for tuning a resonant wavelength of an optical resonator are provided, the methods including: providing an optical resonator having a surface; determining an initial resonant wavelength emitted by the optical resonator in response to an electromagnetic radiation input; determining a number of layers of dielectric material based on a difference between the initial resonant wavelength and a target resonant wavelength and a predetermined tuning characteristic; and applying the determined number of layers of dielectric material to the surface of the optical resonator to tune the initial resonant wavelength to a tuned resonant wavelength.
    Type: Grant
    Filed: June 16, 2008
    Date of Patent: April 22, 2014
    Assignee: The Trustees of Columbia University in the City of New York
    Inventors: Chee Wei Wong, Xiaodong Yang, Charlton Chen, Chad Husko
  • Patent number: 8649640
    Abstract: The present invention provides an optical 90-degree hybrid circuit for reducing wavelength dependency of an IQ phase difference. An optical 90-degree hybrid circuit according to the present invention comprises a first demultiplexing optical coupler including a first and second input port, a second demultiplexing optical coupler including a third and fourth input port, first and second arm waveguides connected to the first and second input port, each having the same length, a third and fourth arm waveguides connected to the third and fourth input port, each having the same length, a 90-degree phase shift section installed in one of the first to fourth arm waveguides, a first optical coupler connected to the first and third arm waveguide, and a second optical coupler connected to the second and fourth arm waveguide, the light is inputted into the first and fourth input port or into the second and third input port.
    Type: Grant
    Filed: July 22, 2010
    Date of Patent: February 11, 2014
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Yohei Sakamaki, Yusuke Nasu, Toshikazu Hashimoto, Kuninori Hattori, Hiroshi Takahashi
  • Patent number: 8634679
    Abstract: Consistent with the present disclosure an optical filter is provided that preferably includes a plurality of looped or ring-shaped waveguides provided on a substrate which are coupled to one another by tunable couplers. Portions of each waveguide constitute part of each tunable coupler, which may include, for example, a Mach-Zehnder interferometer. A heater may be thermally coupled to one or both arms of the Mach-Zehnder interferometer, to thereby adjust an amount of optical coupling between adjacent looped waveguides. The filter bandwidth (i.e., the spectral width of the passband), which, as noted above, is related to such coupling, can thus also be tuned or varied. Additional heaters may be provided to tune the center wavelength of the passband so that a filter having both a variable passband spectral width and center wavelength can be obtained.
    Type: Grant
    Filed: September 15, 2008
    Date of Patent: January 21, 2014
    Assignee: Infinera Corporation
    Inventor: Brent E. Little
  • Patent number: 8606060
    Abstract: The present invention is a method and an apparatus for dynamic manipulation and dispersion in photonic crystal devices. In one embodiment, a photonic crystal structure comprises a substrate having a plurality of apertures formed therethrough, a waveguide formed by “removing” a row of apertures, and a plurality of pairs of lateral electrical contacts, the lateral electrical contact pairs extending along the length of the waveguide in a spaced-apart manner. The lateral electrical contact pairs facilitate local manipulation of the photonic crystal structure's refractive index. Thus, optical signals of different wavelengths that propagate through the photonic crystal structure can be dynamically manipulated.
    Type: Grant
    Filed: May 4, 2005
    Date of Patent: December 10, 2013
    Assignee: International Business Machines Corporation
    Inventors: Hendrik F. Hamann, Sharee J. McNab, Martin P. O'Boyle, Yurii A. Vlasov
  • Patent number: 8532441
    Abstract: An optical device comprising a 1×2 optical coupler on a planar substrate and a waveguide on the planar substrate, the waveguide having a first arm and a second arm coupled to the 1×2 optical coupler. The device also comprises an optical resonator on the planar substrate, wherein the optical resonator is optically coupled to the first arm and the optical resonator is substantially athermalized.
    Type: Grant
    Filed: November 3, 2009
    Date of Patent: September 10, 2013
    Assignee: Alcatel Lucent
    Inventor: Mahmoud Rasras
  • Patent number: 8520988
    Abstract: An optical switch includes a microresonator comprising a plurality of silicon nanoparticles within a silicon-rich silicon oxide layer. The microresonator further includes an optical coupler optically coupled to the microresonator and configured to be optically coupled to a pump source and to a signal source. A method of optical switching includes providing an optical switch comprising an optical coupler and a microresonator having a plurality of nanoparticles and receiving an optical pulse by the optical switch, wherein at least a portion of the optical pulse is absorbed by the nanoparticles such that at least a portion of the microresonator undergoes an elevation of temperature and a corresponding refractive index change when the optical pulse has an optical power greater than a predetermined threshold level.
    Type: Grant
    Filed: April 23, 2012
    Date of Patent: August 27, 2013
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventors: Michel J. F. Digonnet, Anuranjita Tewary, Mark Brongersma
  • Patent number: 8515216
    Abstract: Disclosed is a system including an integrated silicon-based structure including a microcavity configured to receive optical energy from an input beam carrying an optical signal and absorb the optical energy by a nonlinear multi-photon absorption process. For example, the multi-photon absorption process can be two-photon absorption (TPA). The integrated silicon-based structure further includes electrodes responsive to the nonlinear multi-photon absorption process in the microcavity for producing an electronic signal indicative of the optical signal. A related method is also disclosed.
    Type: Grant
    Filed: November 3, 2009
    Date of Patent: August 20, 2013
    Assignee: Massachusetts Institute of Technology
    Inventors: Jorge Bravo Abad, Erich P. Ippen, Marin Soljacic
  • Patent number: 8497467
    Abstract: A system and method for controlling an optical filter is provided. The system and method includes dithering a delay of an optical path within an optical filter unit cell, measuring a position of a filter zero, measuring a position of a filter pole, or measuring positions of both a filter zero and a filter pole by observing an output of the unit cell when the delay is dithered, and using the measurement as feedback for maintaining the position of the filter zero at a desired position, maintaining the position of the filter pole at a desired position, or maintaining the positions of both the filter zero and the filter pole at desired positions.
    Type: Grant
    Filed: December 16, 2009
    Date of Patent: July 30, 2013
    Assignee: Telcordia Technologies, Inc.
    Inventor: Paul Toliver
  • Patent number: 8483522
    Abstract: The invention relates to an optical modulator, comprising a first waveguide for a signal to be modulated, a second waveguide for a control signal, and an auxiliary waveguide, wherein the auxiliary waveguide is supported by a carrier which can be deflected to change a distance between the first waveguide and the auxiliary waveguide, wherein the carrier also comprises two layers with different coefficients of thermal expansion and the second waveguide is guided in such a way that a temperature of the carrier at least in a section can be manipulated by light transported by the second waveguide. The invention further relates to an integrated optical circuit comprising such an optical modulator, and to a modulation method which can be performed with such a modulator.
    Type: Grant
    Filed: September 23, 2009
    Date of Patent: July 9, 2013
    Assignee: Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
    Inventors: Helmut Heidrich, Peter Luetzow
  • Patent number: 8483521
    Abstract: Disclosed are resonant optical modulators, and methods of use thereof, that achieve constant photon populations in the resonator by simultaneously modulating at least two variable modulation parameters.
    Type: Grant
    Filed: May 28, 2010
    Date of Patent: July 9, 2013
    Assignee: Massachusetts Institute of Technology
    Inventor: Milos Popovic
  • Patent number: 8369659
    Abstract: An electromagnetically responsive element includes sets of arrangements of self-resonant bodies, such as atoms or quantum dots that form an effective dielectric constant, typically at or near a resonance.
    Type: Grant
    Filed: September 29, 2008
    Date of Patent: February 5, 2013
    Inventors: W. Daniel Hillis, Roderick A. Hyde, Nathan P. Myhrvold, Clarence T. Tegreene, Lowell L. Wood, Jr.
  • Patent number: 8358881
    Abstract: An electromagnetically responsive element includes sets of arrangements of self-resonant bodies, such as atoms or quantum dots that form an effective dielectric constant, typically at or near a resonance.
    Type: Grant
    Filed: July 9, 2008
    Date of Patent: January 22, 2013
    Inventors: W. Daniel Hillis, Roderick A. Hyde, Nathan P. Myhrvold, Clarence T. Tegreene, Lowell L. Wood, Jr.
  • Patent number: 8349605
    Abstract: A waveguide sensor capable of direct, real-time detection and monitoring of analytes in the vicinity of the waveguide surface without requiring the tagging or labeling of the analyte, is described. Analytic and numerical calculations have predicted that by locally detecting either changes in the evanescent field or changes in the light coupled out of the waveguide as a result of the presence of the analyte, high detection sensitivity will be able to be achieved.
    Type: Grant
    Filed: April 12, 2006
    Date of Patent: January 8, 2013
    Assignee: Colorado State University Research Foundation
    Inventors: Kevin L. Lear, David S. Dandy, Matthew D. Stephens, Guangwei Yuan
  • Patent number: 8306375
    Abstract: A first exemplary aspect of the present invention is a wavelength-tunable optical transmitter including: a semiconductor substrate (101); a wavelength-tunable light source that is formed on the semiconductor substrate (101) and includes at least a first reflector (102) of a wavelength-tunable type and a gain region (104); a semiconductor optical modulator formed on the semiconductor substrate (101); a first semiconductor optical waveguide (105c) that is formed on the semiconductor substrate (101) and smoothly connected to the wavelength-tunable light source; a second semiconductor optical waveguide (105d) that is formed on the semiconductor substrate and smoothly connected to the semiconductor optical modulator; a waveguide coupling region (108) in which the first and second semiconductor optical waveguides are collinearly coupled with a length LC that is not equal to m/2 (m: integer) times a complete coupling length LC0; and a second reflector (113) formed at an end of the waveguide coupling region (108).
    Type: Grant
    Filed: March 27, 2009
    Date of Patent: November 6, 2012
    Assignee: NEC Corporation
    Inventor: Tomoaki Kato
  • Patent number: 8306372
    Abstract: The waveguide-type polarizer includes: a Z-cut lithium niobate substrate; an optical waveguide having a ridge structure and formed on the substrate; a low refractive index film formed with a thickness satisfying 0?n·t/??0.3742 (where n is a refractive index, t (?m) is the thickness of the film, and ? (?m) is the wavelength of a light wave) on the side of the ridge structure; and a high refractive index film formed with a thickness satisfying 0.089?n·/? on the low refractive index film. The width of the ridge structure is a ridge width where the distribution of ordinary light of the light waves propagated through the optical waveguide changes and the distribution of extraordinary light of the light waves does not change, the angle of the ridge structure is less than 90°, and the waveguide-type polarizer has a function of transmitting extraordinary light.
    Type: Grant
    Filed: March 29, 2011
    Date of Patent: November 6, 2012
    Assignee: Sumitomo Osaka Cement Co., Ltd.
    Inventors: Katsutoshi Kondou, Masanao Kurihara, Toru Sugamata
  • Patent number: 8260093
    Abstract: Fibre substrates act as a conduit for light along which response signals are transmitted to a controller in the form of an electronic device associated with a component. The processed signals are stored in a local memory to provide a component history and a prediction of future performance and life. Service and repair history may be added to the component device memory to enable a complete history to be stored with the component. A controller may transmit data to an external controller or display through typically a wireless connection. Power to the component electronics may be provided by an induction loop or transformer.
    Type: Grant
    Filed: November 10, 2008
    Date of Patent: September 4, 2012
    Assignee: Rolls-Royce, PLC
    Inventor: Ian C. D. Care
  • Patent number: 8237102
    Abstract: Radiation detection systems and methods. In one approach, optical radiation can be detected by using the radiation to be detected as input to a high index contrast waveguide modulator that modulates a wavelength of light that falls within the detection band of a detector. In another approach, the optical radiation that is to be detected is combined with a high power CW boost mode signal in a waveguide, and the sum and/or difference frequencies are detected. In either approach, one can use grating couplers to couple the optical radiation of interest into a waveguide.
    Type: Grant
    Filed: December 3, 2009
    Date of Patent: August 7, 2012
    Assignee: University of Washington
    Inventors: Tom Baehr-Jones, Michael J. Hochberg
  • Patent number: 8238697
    Abstract: A polarization beam splitter-polarization rotator-polarization beam combiner optical structure comprising a pair of polarization rotators having a polarization beam splitter associated with the input ends of the two polarization rotators, and a polarization beam combiner associated with output ends of the two polarization rotators, and a method of purifying a light signal comprising TE and TM modes by disassociating the primary TE and TM modes from first order splitter and rotation error components.
    Type: Grant
    Filed: April 19, 2010
    Date of Patent: August 7, 2012
    Assignee: Infinera Corporation
    Inventors: Brent E. Little, Wei Chen
  • Patent number: 8224467
    Abstract: An information processing apparatus in which its function can be improved by installing an additional module to an existing module in a module configuration system. A video information processing apparatus 100, which is an existing module, has the function of reading, from a network module 150 as an additional module, software held in the network module 150. The software held in the network module 150 includes control software for the network module and software for making the control software available to the existing video information processing apparatus 100. The software held in the network module 150 is added to the video information processing apparatus 100, and the network module 150 is operated by the video information processing apparatus 100.
    Type: Grant
    Filed: August 31, 2005
    Date of Patent: July 17, 2012
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kiyoyasu Maruyama, Kyosuke Yoshimoto, Chihiro Morita, Tokumichi Murakami, Yoshiki Mizutani
  • Publication number: 20120176766
    Abstract: Disclosed is an optical element that includes: a light guide body into which light from a light-emitting element enters; carrier generation layer (6) formed in the light guide body, in which carriers are generated by the light from the light guide body; plasmon excitation layer (8) stacked on carrier generation layer (6), which has a plasma frequency higher than the frequency of light generated when carrier generation layer (6) is excited by the light from the light-emitting element; and wave vector conversion layer (10) stacked on plasmon excitation layer (8), which converts light incident from plasmon excitation layer (8) into light having a predetermined exit angle to output the light. Plasmon excitation layer (8) is sandwiched between low dielectric constant layer (7) and high dielectric constant layer (9).
    Type: Application
    Filed: September 30, 2010
    Publication date: July 12, 2012
    Applicant: NEC CORPORATION
    Inventor: Masanao Natsumeda
  • Patent number: 8184932
    Abstract: A method fabricates an optical switch comprising a microsphere coated with silicon nanocrystals. The method includes providing a silica optical fiber. The method further includes melting at least a portion of the fiber to form at least one silica microsphere. The method further includes coating the microsphere with a silica layer. The method further includes precipitating silicon nanocrystals within the silica layer by annealing the microsphere. The method further includes passivating the nanocrystals by annealing the microsphere in a hydrogen-containing atmosphere.
    Type: Grant
    Filed: February 3, 2010
    Date of Patent: May 22, 2012
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventors: Michel J. F. Digonnet, Anuranjita Tewary, Mark Brongersma
  • Patent number: 8139904
    Abstract: A method of implementing optical deflection switching includes directing a tuning operation at a specific region of coupled optical resonators coupled to an input port, a first output port and a second output port, the coupled optical resonator including a plurality of cascaded unit cells; wherein the tuning operation interrupts a resonant coupling between one or more of the unit cells of the coupled resonators so as to cause an input optical signal from the input port to be directed from the first output port to the second output port.
    Type: Grant
    Filed: September 18, 2007
    Date of Patent: March 20, 2012
    Assignee: International Business Machines Corporation
    Inventors: William M. Green, Fengnian Xia, Yurii Vlasov
  • Patent number: 8098965
    Abstract: A novel electroabsorption modulator based on tuning the Fermi level relative to mid-gap states in a semiconductor. The modulator includes a semiconductor waveguide that has an input port and an output port. Between the input port and the output port is a section of the waveguide that functions as an electroabsorptive region. Adjacent to the electroabsorptive region are electrical contacts. In operation by adjusting voltages on the electrical contacts, the quasi-Fermi level in the electroabsorptive region of the semiconductor waveguide is brought above or below mid band-gap electronic states. As these states transition between occupancy and vacancy, the absorption coefficient for optical radiation in the electroabsorptive region of the semiconductor changes.
    Type: Grant
    Filed: December 3, 2009
    Date of Patent: January 17, 2012
    Assignee: University of Washington
    Inventors: Tom Baehr-Jones, Michael J. Hochberg
  • Patent number: 8078016
    Abstract: Techniques are generally disclosed for optical devices that may be used to implement a variety of logic devices or other circuits by optical means. Example optical devices use a photodiode to alter the charge carrier concentration in a waveguide, thereby altering the index of refraction of the waveguide. The photodiode may be driven by an optical signal, which may be coupled to the photodiode through an optical waveguide. The optical signal may be configured to control the phase of coherent light coupled through the waveguide. A variety of logic devices and other circuits may be implemented by allowing the light coupled through the waveguide to constructively or destructively interfere with other coherent light.
    Type: Grant
    Filed: April 10, 2009
    Date of Patent: December 13, 2011
    Assignee: Empire Technology Development LLC
    Inventor: Ezekiel Kruglick
  • Patent number: 7941011
    Abstract: In a multilevel light intensity modulator of the invention, input light is branched into n (n is an integer of 2 or more), and respectively sent to n branching waveguides. On the branching waveguides are respectively provided MZI light modulating sections. The MZI light modulating sections branch the input light into two at a branching ratio different from 0.5:0.5, and respectively output a binary optical signal with a quenching ratio being deteriorated, by on/off driving with a binary electric signal. Then by coupling the light output from the MZI light modulating sections, an optical signal with the light intensity modulated to a 2n value not including the zero level is output. As a result quaternary or higher level light intensity modulation which does not include the zero level, can be realized by a practical configuration using a binary electric signal.
    Type: Grant
    Filed: September 18, 2009
    Date of Patent: May 10, 2011
    Assignee: Fujitsu Limited
    Inventor: Masaharu Doi
  • Patent number: 7922337
    Abstract: The invention relates to a method for establishing a light beam (CLB) with substantially constant luminous intensity comprising the steps of establishing a light beam (LB) by means of a light source (SAL) and controlling an attenuation of said light beam (LB) on the basis of occurrences of luminous intensity peaks (IP) in said light beam (LB).
    Type: Grant
    Filed: March 16, 2004
    Date of Patent: April 12, 2011
    Assignee: Sign-Tronic AG
    Inventor: Henrik Glent-Madsen
  • Patent number: 7826688
    Abstract: Embodiments of the inventions described herein comprise a device and method for manipulating an optical beam. The method comprises propagating an optical beam through a waveguide in proximity to a resonant cavity and pumping the resonant cavity with sufficient optical power to induce non-linearities in the refractive index of the resonant cavity. The method further comprises tuning the resonant frequency band of the resonant cavity with a modulation signal such that the optical beam is manipulated in a useful way.
    Type: Grant
    Filed: October 20, 2006
    Date of Patent: November 2, 2010
    Assignee: Luxtera, Inc.
    Inventors: Thiruvikraman Sadagopan, Roger Koumans, Thierry Pinguet, Lawrence Cary Gunn, III
  • Patent number: 7792398
    Abstract: Data to be sent are, in a data communication unit, first divided into electric signal packets by a data transmission/receipt control unit, whereby an electric signal sequence tag is added to each electric signal packet, then converted into optical packets by an optical signal transmitting unit, and transmitted through an optical signal path. At optical switch, the optical paths of the packets are switched to optical signal paths by the actions of optical destination tags that are respectively synchronized with optical packets and irradiated by an optical signal transmitting unit. At optical signal receiving units, the received optical packets are converted to electric signal packets, and reassembled to be original data according to the identification information on the reassembly sequence recorded in the sequence tag in an electric signal packet by data transmission/receipt control units, and distributed to client devices as electric signals.
    Type: Grant
    Filed: March 14, 2005
    Date of Patent: September 7, 2010
    Assignees: Dainichiseika Color & Chemicals Mfg. Co., Ltd., National Institute of Advanced Industrial Science and Technology
    Inventors: Norio Tanaka, Ichiro Ueno, Takashi Hiraga, Nobutaka Tanigaki, Toshiko Mizokuro, Noritaka Yamamoto, Hiroyuki Mochizuki
  • Publication number: 20100202724
    Abstract: A polarization beam splitter-polarization rotator-polarization beam combiner optical structure comprising a pair of polarization rotators having a polarization beam splitter associated with the input ends of the two polarization rotators, and a polarization beam combiner associated with output ends of the two polarization rotators, and a method of purifying a light signal comprising TE and TM modes by disassociating the primary TE and TM modes from first order splitter and rotation error components.
    Type: Application
    Filed: April 19, 2010
    Publication date: August 12, 2010
    Inventors: Brent E. Little, Wei Chen
  • Patent number: 7711215
    Abstract: It is an object of the present invention to provide a DSB-SC system capable of suppressing a third order component. The DSB-SC modulation having high extinction ratio can be realized by adjusting the first order component, which is generated by applying a modulation signal (3fm), and the third order component, which is generated by applying a basic signal (fm), to have reversed phase and the same intensity level, and then by applying the first order component to the third order component, these two components cancel each other.
    Type: Grant
    Filed: August 30, 2006
    Date of Patent: May 4, 2010
    Assignee: National Institute of Information and Communications Technology
    Inventors: Tetsuya Kawanishi, Masayuki Izutsu, Takahide Sakamoto, Masahiro Tsuchiya
  • Patent number: 7702188
    Abstract: A polarization beam splitter-polarization rotator-polarization beam combiner optical structure comprising a pair of polarization rotators having a polarization beam splitter associated with the input ends of the two polarization rotators, and a polarization beam combiner associated with output ends of the two polarization rotators, and a method of purifying a light signal comprising TE and TM modes by disassociating the primary TE and TM modes from first order splitter and rotation error components.
    Type: Grant
    Filed: July 24, 2007
    Date of Patent: April 20, 2010
    Assignee: Infinera Corporation
    Inventors: Brent E. Little, Wei Chen
  • Patent number: 7697798
    Abstract: A catheter with many fiber optic pressure sensors. The sensor diaphragm is formed from a wafer with a thin silicon layer and a silicon substrate layer separated by a silicon dioxide layer. A method includes masking and etching channels through the silicon substrate layer in a pattern of concentric circles to form a concentric circular etched channels and cylindrical unetched portions of the silicon substrate layer between the channels, exposing the silicon dioxide in the etched regions, and dissolving the exposed silicon dioxide to expose the crystalline silicon layer in the etched regions. The unetched cylindrical portion of the silicon substrate forms the diaphragm support element and the thin silicon layer forms the diaphragm. After applying a reflective coating to the exposed thin silicon layer, the support element face is adhered to the end face of a tubular housing, and a fiber optic probe is inserted in the tubular housing.
    Type: Grant
    Filed: January 21, 2009
    Date of Patent: April 13, 2010
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Nicholas Lagakos, Joseph A Bucaro
  • Patent number: 7684664
    Abstract: An optical switch includes a microresonator comprising a plurality of nanoparticles. The microresonator is configured to receive signal light having a signal wavelength and to receive a pump pulse having a pump wavelength. At least a portion of the microresonator is responsive to the pump pulse by undergoing a refractive index change at the signal wavelength.
    Type: Grant
    Filed: September 18, 2006
    Date of Patent: March 23, 2010
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventors: Michel J. F. Digonnet, Anuranjita Tewary, Mark Brongersma