Modulation Of Polarized Light Via Modulating Input Signal Patents (Class 359/246)
  • Patent number: 11119380
    Abstract: Optical modulators are described having a Mach-Zehnder interferometer and a pair of RF electrodes interfaced with the Mach-Zehnder interferometer in which the Mach-Zehnder interferometer comprises optical waveguides formed from semiconductor material. The optical modulator additionally comprises a plurality of phase shifters configured to interface with the plurality of interconnected optical waveguides such that at least one phase shifter of the plurality of phase shifters is interfaced with at least one optical waveguide of the plurality of interconnected optical waveguides. A phase shifter controller, including an energy source with a variable output controlled by the controller and a plurality of electrical connections connecting the energy source to each of the plurality of phase shifters, is also included. In various embodiments, the plurality of electrical connections are configured to provide approximately equal power to each of the phase shifting elements from the energy source.
    Type: Grant
    Filed: September 23, 2019
    Date of Patent: September 14, 2021
    Assignee: NeoPhotonics Corporation
    Inventors: Giorgio Giaretta, Alessio Pirastu
  • Patent number: 11002994
    Abstract: Apparatus, systems, or methods for mixed reality are disclosed herein. An apparatus may include an optical structure, a display structure, and a controller coupled to the optical structure and the display structure. The optical structure may be controlled by a first electrical signal to act as a transparent glass to present a natural view, or to act as a magnifying glass to present a virtual view. The display structure may be controlled by a second electrical signal to act as an opaque display or a transparent display. In addition, the controller may control the apparatus to operate in at least an AR mode to interlace the natural view and the virtual view. Other embodiments may also be described and claimed.
    Type: Grant
    Filed: August 29, 2019
    Date of Patent: May 11, 2021
    Assignee: Intel Corporation
    Inventors: Jun Jiang, Zhiming Zhuang
  • Patent number: 10983372
    Abstract: An electro-optic modulator includes a doped semiconductor crystal having a crystallographic surface having an amplitude modulation orientation, a first metal electrode located on a first surface of the doped semiconductor crystal, a second metal electrode located on a second surface of the doped semiconductor crystal, and accumulation space charge regions located within surface regions of the doped semiconductor crystal that are proximal to the first metal electrode and the second metal electrode and including excess charge carriers of a same type as majority charge carriers of the doped semiconductor crystal.
    Type: Grant
    Filed: July 16, 2018
    Date of Patent: April 20, 2021
    Assignee: REDLEN TECHNOLOGIES, INC.
    Inventors: Francis Joseph Kumar, Saied Taherion, David Giles, Jason MacKenzie
  • Patent number: 10739642
    Abstract: A pixel structure, a liquid crystal display panel, a method of operating the liquid crystal display panel, and a display device are disclosed. The pixel structure includes a light shutter for switching between first and second states, wherein in the first and second states, the light shutter only allows first polarized light having a first polarization direction and second polarized light having a second polarization direction to pass, respectively; a birefringent filter for causing emergent paths of the first and second polarized light to be first and second paths, respectively; a first liquid crystal unit and a first color filter in the first path and corresponding to a first sub-pixel region, wherein the first color filter is at a light-emergent side of the first liquid crystal unit; and a second liquid crystal unit in the second path and corresponding to a second sub-pixel region.
    Type: Grant
    Filed: September 12, 2019
    Date of Patent: August 11, 2020
    Assignee: BOE TECHNOLOGY GROUP CO., LTD.
    Inventors: Guoqiang Wang, Qingzhao Liu
  • Patent number: 10557977
    Abstract: Methods, systems and devices for diffractive waveplate lens and mirror systems allowing electronically focusing light at different focal planes. The system can be incorporated into a variety of optical schemes for providing electrical control of transmission. In another embodiment, the system comprises diffractive waveplates of different functionality to provide a system for controlling not only focusing but other propagation properties of light including direction, phase profile, and intensity distribution.
    Type: Grant
    Filed: December 14, 2018
    Date of Patent: February 11, 2020
    Assignees: Beam Engineering for Advanced Measurements Co., U.S. Government as represented by the Secretary of the Army
    Inventors: Nelson V. Tabirian, Svetlana Serak, Olena Uskova, David E. Roberts, Anna Tabirian, Diane Steeves, Brian Kimball
  • Patent number: 10429634
    Abstract: A microelectrical mechanical system (MEMS) implementation of tunable Fabry Perot filter devices is disclosed. The advantages associated with the use of these tunable etalons include increases in aperture size, displacement, reliability, and a reduction in cost. In some examples, integrated tunable detectors in miniature spectrometers using a thermal driven MEMS Fabry-Perot tunable filter are provided. Other examples use integrated thermal driven tunable MEMS Fabry-Perot filter to select fiber optical communication channel.
    Type: Grant
    Filed: December 4, 2017
    Date of Patent: October 1, 2019
    Assignee: Agiltron, Inc.
    Inventors: Guanghai Jin, Congshun Wang, Jing Zhao
  • Patent number: 10418386
    Abstract: An optical receiver that can tune a selected wavelength using a wavelength tunable filter transmitting a plurality of wavelengths. The optical receiver is a wavelength tunable optical receiver that includes: a wavelength tunable filter (100) transmitting laser light from an optical fiber; and a photodiode (300) receiving laser light passing through the wavelength tunable filter (100), in which the wavelength tunable filter 100 is a Fabry-Perot type etalon filter transmitting a plurality of wavelengths. When a channel with a specific wavelength is moved to a channel with another wavelength, an optical channel is selected based on a peak different from a transmissive peak of an FP etalon filter selecting the previous channel so that temperature of the wavelength tunable filter can be changed. A light-receiving photodiode chip is disposed on a thermoelectric element and a wavelength tunable filter transmits different wavelengths in accordance with temperature of the thermoelectric element.
    Type: Grant
    Filed: May 13, 2014
    Date of Patent: September 17, 2019
    Assignee: PHOVEL. CO. LTD
    Inventor: Jeong-Soo Kim
  • Patent number: 10302951
    Abstract: A head mounted display system for use with a mobile computing device includes a main body configured to be worn on a human head. A lens assembly within the main body includes a first lens configured to focus vision of a wearer on a first area of a display of the mobile computing device when the mobile computing device is secured to the main body. A first contact point disposed in a fixed position relative to the first lens is configured to contact a surface of the display when the mobile computing device is secured to the main body. The first contact point is detectable by the mobile computing device and usable by the mobile computing device to derive a position of the display relative to the at least one lens.
    Type: Grant
    Filed: May 18, 2017
    Date of Patent: May 28, 2019
    Assignee: Merge Labs, Inc.
    Inventor: Franklin A. Lyons
  • Patent number: 10222637
    Abstract: A system for integrated power combiners is disclosed and may include receiving optical signals in input optical waveguides and phase-modulating the signals to configure a phase offset between signals received at a first optical coupler, where the first optical coupler may generate output signals having substantially equal optical powers. Output signals of the first optical coupler may be phase-modulated to configure a phase offset between signals received at a second optical coupler, which may generate an output signal having an optical power of essentially zero and a second output signal having a maximized optical power. Optical signals received by the input optical waveguides may be generated utilizing a polarization-splitting grating coupler to enable polarization-insensitive combining of optical signals. Optical power may be monitored using optical detectors. The monitoring of optical power may be used to determine a desired phase offset between the signals received at the first optical coupler.
    Type: Grant
    Filed: November 14, 2017
    Date of Patent: March 5, 2019
    Assignee: Luxtera, Inc.
    Inventors: Attila Mekis, Adithyaram Narasimha, Jeremy Witzens
  • Patent number: 10067069
    Abstract: Machine vision systems are provided. More specifically, machine vision systems are provided that incorporate polarized illumination and detection. Polarized electromagnetic radiation may be used to reduce glare and enable increased flashing speed in machine vision detection systems. Ultra-high power light sources, heat tolerant polarizing media and optical-path systems may be coupled with ultra-high speed flashing systems to enable increased web-speed while maintaining necessary accuracy in web-scanning operations.
    Type: Grant
    Filed: March 10, 2017
    Date of Patent: September 4, 2018
    Inventor: Gilbert Pinter
  • Patent number: 10036851
    Abstract: A polarization rotator rotates a portion of light received from an input surface to an orthogonal polarization. A polarization splitter is coupled to the polarization rotator and includes a channel waveguide section that transmits the rotated portion of the light towards an output surface. The splitter also includes a splitter waveguide separated from the channel waveguide section by a dielectric gap. The splitter waveguide couples an unrotated portion of the light away from a target region of the output surface.
    Type: Grant
    Filed: April 6, 2017
    Date of Patent: July 31, 2018
    Assignee: Seagate Technology LLC
    Inventors: Chubing Peng, Michael Allen Seigler
  • Patent number: 9903350
    Abstract: Actuators (artificial muscles) comprising twist-spun nanofiber yarn or twist-inserted polymer fibers generate torsional and/or tensile actuation when powered electrically, photonically, chemically, thermally, by absorption, or by other means. These artificial muscles utilize non-coiled or coiled yarns and can be either neat or comprising a guest. Devices comprising these artificial muscles are also described.
    Type: Grant
    Filed: August 1, 2013
    Date of Patent: February 27, 2018
    Assignee: The Board of Regents, The University of Texas System
    Inventors: Na Li, Carter S. Haines, Marcio D. Lima, Monica Jung De Andrade, Shaoli Fang, Jiyoung Oh, Mikhail E. Kozlov, Fatma Goktepe, Ozer Goktepe, Dongseok Suh, Ray H. Baughman
  • Patent number: 9843157
    Abstract: A laser system comprising an RE:XAB gain medium within a resonator cavity. X is selected from Ca, Lu, Yb, Nd, Sm, Eu, Gd, Ga, Tb, Dy, Ho, Er, and RE is selected from Lu, Y, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Pr, Tm, Cr, Ho. The system further comprises a pumping source having optical output directed towards the gain medium. A laser controller operates the pumping source. The system further comprises a heat spreader, the heat spreader in thermal communication with the gain medium through a surface wherein the pump source has optical output incident.
    Type: Grant
    Filed: May 12, 2016
    Date of Patent: December 12, 2017
    Assignee: Voxtel, Inc.
    Inventor: George Williams
  • Patent number: 9830555
    Abstract: In one aspect, a computational machine includes an optical device configured to receive energy from an optical energy source and generate a number N1 of optical signals, and a number N2 of coupling devices, each of which controllably couples a plurality of the number N1 optical signals. The coupling devices are individually controlled to simulate a computational problem. In another aspect, a computational machine includes a number N1 of parametric oscillators and a number N2 of coupling devices, each of which controllably couples a plurality of the number N1 of parametric oscillators together. The coupling devices are individually controlled to simulate a computational problem.
    Type: Grant
    Filed: July 9, 2014
    Date of Patent: November 28, 2017
    Assignees: The Board of Trustees of the Leland Stanford Junior University, Inter-University Research Institute Corporation, Research Organization of Information and Systems
    Inventors: Alireza Marandi, Yoshihisa Yamamoto, Robert Byer, Zhe Wang, Shoko Utsunomiya
  • Patent number: 9830506
    Abstract: A method and apparatus for cross-modal matching with polarimetric thermal image data is provided. According to one embodiment, the method comprises receiving a plurality of polarimetric thermal images of a face acquired by a polarimetric thermal imaging camera, extracting features of the face from each of the plurality of images to generate a plurality of feature vectors for each of the plurality of images, compositing the feature vectors for each of the plurality of images together to form composite feature vectors and cross-modally matching the composite feature vectors with other feature vectors, in order to determine whether the face matches a face represented by the other feature vectors.
    Type: Grant
    Filed: November 9, 2015
    Date of Patent: November 28, 2017
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Nathaniel J. Short, Shuowen Hu, Alex L. Chan, Kristan P. Gurton
  • Patent number: 9632319
    Abstract: An illuminating magnifier has an annular housing with an underside, an inner edge defining an opening and an outer edge. A magnifying lens fills the opening, which lens has an optical axis. Light emitting diodes are distributed about the axis at the underside of the housing, each diode, when energized, producing a relatively wide angle conical light beam with a central hot spot cone which cart illuminate a viewing field below the lens. Special mounting surfaces at the housing underside aim the diodes in the diode array at selected angles relative to the lens axis so that the conical light beams therefrom overlap and all points in the viewing field are illuminated by the light beam from each diode and a center region of that field around the axis is illuminated by the hot spot cones of all the diodes.
    Type: Grant
    Filed: June 1, 2016
    Date of Patent: April 25, 2017
    Inventor: Richard L. May
  • Patent number: 9632353
    Abstract: A backlight light guide comprises a generally planar structure having a light guide layer having a surface that includes a spaced array of extractors, a backside reflective layer, a low refractive index coupling layer disposed on an opposite major surface of the light guide layer, and a reflective polarizer to provide recycling of unused light.
    Type: Grant
    Filed: January 24, 2013
    Date of Patent: April 25, 2017
    Assignee: 3M Innovative Properties Company
    Inventors: Andrew J. Ouderkirk, Erin A. McDowell
  • Patent number: 9608732
    Abstract: It becomes difficult to regenerate transmitting signals depending on modulation systems for the optical phase modulation in a polarization multiplexed optical communication system employing the optical digital coherent communication system, therefore, an optical transmitter according to an exemplary aspect of the invention includes first optical quadrature modulation means for performing a phase modulation on a first continuous light beam and outputting a first transmitting light beam; second optical quadrature modulation means for performing a phase modulation on a second continuous light beam belonging in the same frequency band as that of the first continuous light beam and outputting a second transmitting light beam; optical phase difference adding means for adding an optical phase difference varying temporally between the first transmitting light beam and the second transmitting light beam; and polarization multiplexing means for polarization-multiplexing the first transmitting light beam and the second
    Type: Grant
    Filed: February 13, 2013
    Date of Patent: March 28, 2017
    Assignee: NEC CORPORATION
    Inventor: Daisaku Ogasahara
  • Patent number: 9529151
    Abstract: A polarization conversion element is disclosed in which an optical waveguide formed on a substrate sequentially includes a first waveguide portion, a polarization rotation portion, and a second waveguide portion, an effective refractive index of a TE mode having the highest effective refractive index in an eigen mode of waveguide light on a sectional surface of the first waveguide portion is higher than an effective refractive index of a TM mode having the highest effective refractive index, an effective refractive index of the TM mode having the highest effective refractive index on a sectional surface of the second waveguide portion is higher than an effective refractive index of the TE mode having the highest effective refractive index, and heights of waveguide structures (for example, cores) of the first waveguide portion and the second waveguide portion are equal to each other.
    Type: Grant
    Filed: December 21, 2015
    Date of Patent: December 27, 2016
    Assignee: FUJIKURA LTD.
    Inventors: Kazuhiro Goi, Akira Oka, Hiroyuki Kusaka, Kensuke Ogawa
  • Patent number: 9417466
    Abstract: A method and system for integrated power combiners are disclosed and may include a chip comprising a polarization controller, the polarization controller comprising an input optical waveguide, optical couplers, and a polarization-splitting grating coupler. The chip may be operable to: generate two output signals from a first optical coupler that receives an input signal from said input optical waveguide, phase modulate one or both of the two output signals to configure a phase offset between the two generated output signals before communicating signals with the phase offset to a second optical coupler. One or both optical signals generated by said second optical coupler may be phase modulated to configure a phase offset between signals communicated to the polarization-splitting grating coupler; and an optical signal of a desired polarization may be launched into an optical fiber via the polarization-splitting grating coupler by combining the signals communicated to the polarization-splitting grating coupler.
    Type: Grant
    Filed: January 7, 2014
    Date of Patent: August 16, 2016
    Assignee: LUXTERA, INC.
    Inventors: Attila Mekis, Adithyaram Narasimha, Jeremy Witzens
  • Patent number: 9377615
    Abstract: An illuminating magnifier has an annular housing with an underside, an inner edge defining an opening and an outer edge. A magnifying lens fills the opening, which lens has an optical axis. Light emitting diodes are distributed about the axis at the underside of the housing, each diode, when energized, producing a relatively wide angle conical light beam with a central hot spot cone which can illuminate a viewing field below the lens. Special mounting surfaces at the housing underside aim the diodes in the diode array at selected angles relative to the lens axis so that the conical light beams therefrom overlap and all points in the viewing field are illuminated by the light beam from each diode and a center region of that field around the axis is illuminated by the hot spot cones of all the diodes.
    Type: Grant
    Filed: October 13, 2013
    Date of Patent: June 28, 2016
    Inventor: Richard L. May
  • Patent number: 9351634
    Abstract: A method for calculating the values of an intraocular lens to be implanted, wherein the results of numerous cataract operations are taken into account in the calculation for intraocular lenses to be implanted in the future. At least the corneal topography, the length of the eye and the depth of the anterior chamber are determined pre-operatively, the values of the IOL to be implanted are calculated by means of ray-tracing, and at least the corneal topography, the length of the eye, the depth of the anterior chamber and the objective, wavefront-based residual refraction are determined post-operatively. The measurement values determined pre-operatively and post-operatively are used to optimize the surgically-induced astigmatism and the post-operative anatomical lens position for calculating the values of IOLs to be implanted in the future.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: May 31, 2016
    Assignee: Carl Zeiss Meditec AG
    Inventors: Tobias Bühren, Michael Trost, Burkhard Wagner
  • Patent number: 9344193
    Abstract: A method and system for generating an optical channel signal for transmission through an optical fiber link of an optical communications system. A digital filter processes an input data signal using a compensation function and a shaping function to generate a pair of multi-bit sample streams representing a target optical E-field envelope of the optical channel signal. A modulator modulates an optical carrier light using the pair of multi-bit sample streams to generate the optical channel signal. The compensation function is designed to at least partially compensate impairments of the optical fiber link. The predetermined shaping function is designed to modify a baseband spectrum of the target optical E-field envelope.
    Type: Grant
    Filed: November 20, 2015
    Date of Patent: May 17, 2016
    Assignee: Ciena Corporation
    Inventors: David W. Boertjes, Kevin MacNeill, Jamie Gaudette
  • Patent number: 9344691
    Abstract: An imaging device includes an optical filter. The optical filter has a configuration in which a polarization filter layer and a spectral filter layer are laminated in light transmission direction. Of the polarization filter layer and the spectral filter layer, the layer on the lower side in lamination direction has an uneven top face in the lamination direction. The optical filter is formed by filling the uneven top face with a predetermined filling material so as to even out the top face and then forming other layer.
    Type: Grant
    Filed: July 24, 2012
    Date of Patent: May 17, 2016
    Assignee: RICOH COMPANY, LTD.
    Inventors: Hideaki Hirai, Yasuhiro Sato
  • Patent number: 9270380
    Abstract: In various embodiments, a monolithic integrated transmitter, comprising an on-chip laser source and a modulator structure capable of generating advanced modulation format signals based on amplitude and phase modulation are described.
    Type: Grant
    Filed: May 1, 2014
    Date of Patent: February 23, 2016
    Assignee: FREEDOM PHOTONICS, LLC.
    Inventors: Jonathon Barton, Leif Johansson, Milan Mashanovitch
  • Patent number: 9118422
    Abstract: A pre-equalization optical transmitter includes: a tap coefficient selecting unit for saving, in advance, a tap coefficients for generating an RZ pre-equalization signal and an NRZ pre-equalization signal, and for selecting and outputting one of the tap coefficients according to the value of a parameter that is a factor of transmission power fluctuations; a pre-equalization signal generating unit for generating the RZ pre-equalization signal or the NRZ pre-equalization signal based on the tap coefficient; and a modulating unit for generating a pre-equalization optical transmission signal by modulating an optical signal input from a light source by using a signal obtained through D/A conversion and amplification of the RZ pre-equalization signal or the NRZ pre-equalization signal, wherein a transmission method is switched between an RZ method and NRZ method by switching the tap coefficients by the tap coefficient selecting unit.
    Type: Grant
    Filed: October 17, 2012
    Date of Patent: August 25, 2015
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Takafumi Fujimori, Takashi Sugihara
  • Patent number: 9066083
    Abstract: A single-lens 2D/3D camera has a light valve placed in relationship to a lens module to control the light beam received by the lens module for forming an image on an image sensor. The light valve has a light valve area positioned in a path of the light beam. The light valve has two or more clearable sections such that only one section is made clear to allow part of the light beam to pass through. By separately making clear different sections on the light valve, a number of images as viewed through slightly different angles can be captured. The clearable sections include a right section and a left section so that the captured images can be used to produce 3D pictures or displays. The clearable sections also include a middle section so that the camera can be used as a 2D camera.
    Type: Grant
    Filed: January 8, 2013
    Date of Patent: June 23, 2015
    Assignee: 3DV Co., Ltd.
    Inventor: Allen Kwok Wah Lo
  • Patent number: 9039193
    Abstract: A first light-transmissive plate is provided on an opposite surface of a first substrate of an electro-optic panel to a second substrate. The first light-transmissive plate is smaller than the first substrate, and an end portion of the first substrate is exposed from the first light-transmissive plate. In addition, a heat radiation member made of a metal material is provided so as to be overlapped with the exposed portion from the first light-transmissive plate of the first substrate.
    Type: Grant
    Filed: September 4, 2012
    Date of Patent: May 26, 2015
    Assignee: Seiko Epson Corporation
    Inventor: Tomoaki Miyashita
  • Patent number: 9036239
    Abstract: Electrooptical cell, including, on a substrate (1), a layer of ferroelectric massive material (4), with an electrode (2) forming an earth plane, provided between the substrate (1) and the ferroelectric layer (4), another electrode (5), narrow, mounted opposite the first above the ferroelectric layer and grooves (6) made in the ferroelectric layer, on either side of the upper electrode (5).
    Type: Grant
    Filed: January 23, 2012
    Date of Patent: May 19, 2015
    Inventor: Marc Alexandre Bouvrot
  • Patent number: 9013776
    Abstract: A light modulator includes a band-pass filter configured to select a wavelength of an incident light; a first layer; a second layer configured to include a trench with a bottom surface, a side surface, and a top surface; a thin metal film provided on the side surface of the trench of the second layer; and a dielectric layer provided between the first and second layers at the bottom and the top surfaces of the trench. An electric field is applied to the dielectric layer by using the first and second layers. The dielectric layer is provided between the thin metal film and the first layer at the side surface of the second layer so that the thin metal film has an anisotropic permittivity due to the electric field.
    Type: Grant
    Filed: October 4, 2013
    Date of Patent: April 21, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventor: Mamoru Miyawaki
  • Publication number: 20150098013
    Abstract: An image capture device includes an electro-optics arrangement having an arrangement of polarizers, polarization sensitive optical elements, and polarization modulating elements. First and second polarization sensitive optical elements are provided having an edge displaced relative to a plane normal to an optical axis of the electro-optics arrangement. A control system coupled to the electro-optics arrangement controls the application of voltages to the polarization modulating elements to control the polarization rotation of the light input to the polarization sensitive optical elements, such that the optical path length of the polarization sensitive optical elements is changed to provide for capture of the object images at each of the different focal planes. The first and second polarization sensitive optical elements generate lateral image shifts between respective object images captured at the different focal planes responsive to the polarization rotation of the light input thereto.
    Type: Application
    Filed: October 9, 2013
    Publication date: April 9, 2015
    Applicant: General Electric Company
    Inventors: Daniel Curtis Gray, Kevin George Harding, Frederick Wilson Wheeler, Gil Abramovich
  • Patent number: 8982449
    Abstract: A light modulation layer of a full-color reflective display (112), the light modulation layer including an addressing layer (404); a mirror (406) positioned above the addressing layer (404), the mirror (406) configured to reflect light of a predetermined wavelength band; and an electro-optic layer (416) positioned above the mirror (406), the electro-optic layer (416) configured to absorb light of a predetermined wavelength band in response to a signal received from a switching device (204) of the addressing layer (404).
    Type: Grant
    Filed: April 29, 2010
    Date of Patent: March 17, 2015
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: John Christopher Rudin, Stephen Kitson, Adrian Geisow
  • Patent number: 8970935
    Abstract: A laser device includes a seed laser, a polarizer, a pseudorandom bit sequence (PRBS) pattern generator, and a phase modulator. The polarizer may be optically coupled to receive an output of the seed laser and may generate a polarization filtered output. The PRBS pattern generator may be configured to generate a PRBS pattern. The phase modulator may be configured to apply a PRBS modulation scheme to the polarization filtered output based on the PRBS pattern. The PRBS pattern may be generated to have a length above a first threshold for avoiding an occurrence of backward propagation being in phase with forward propagation in an active fiber receiving an output of the phase modulator when the pattern repeats and below a second threshold for phase mismatch in the active fiber.
    Type: Grant
    Filed: September 27, 2012
    Date of Patent: March 3, 2015
    Assignee: The Johns Hopkins University
    Inventors: Michael L. Dennis, William E. Torruellas, David M. Brown
  • Publication number: 20150030280
    Abstract: A non-reciprocal device incorporating metamaterials which exhibit non-reciprocity through angular momentum biasing. The metamaterial, such as a ring resonator, is angular-momentum biased. This is achieved by applying a suitable mechanical or spatio-temporal modulation to resonant inclusions of the metamaterial, thereby producing strong non-reciprocity. In this manner, non-reciprocity can be produced without requiring the use of large and bulky magnets to produce a static magnetic field. The metamaterials of the present invention can be realized by semiconducting and/or metallic materials which are widely used in integrated circuit technology, and therefore, contrary to magneto-optical materials, can be easily integrated into the non-reciprocal devices and large microwave or optical systems. The metamaterials of the present invention can be compact at various frequencies due to the enhanced wave-matter interaction in the constituent resonant inclusions.
    Type: Application
    Filed: June 5, 2014
    Publication date: January 29, 2015
    Inventors: Andrea Alu, Dimitrios Sounas, Nicholas Estep
  • Patent number: 8923352
    Abstract: One embodiment is directed towards a stabilized laser including a laser to produce light at a frequency and a resonator coupled to the laser such that the light from the laser circulates therethrough. The laser also includes Pound-Drever-Hall (PDH) feedback electronics configured to adjust the frequency of the light from the laser to reduce phase noise in response to light sensed at the reflection port of the resonator and transmission port feedback electronics configured to adjust the frequency of the light from the laser toward resonance of the resonator at the transmission port in response to the light sensed at the transmission port of the resonator, wherein the transmission port feedback electronics adjust the frequency at a rate at least ten times slower than the PDH feedback electronics.
    Type: Grant
    Filed: August 10, 2012
    Date of Patent: December 30, 2014
    Assignee: Honeywell International Inc.
    Inventors: Lee K. Strandjord, Tiequn Qiu, Glen A. Sanders
  • Patent number: 8913205
    Abstract: Disclosed is a segmented liquid crystal modulator panel apparatus and method for driving the same that overcomes electrical cross-talk associated with capacitive coupling to a common electrode. Each modulator segment may be divided into subsegments and driven substantially synchronously and out-of-phase. The field-polarity insensitive LC materials yield a substantially identical optical response for each subsegment, while allowing current on the common electrode to flow between the subsegments, thereby reducing power consumption and decreasing response times.
    Type: Grant
    Filed: October 22, 2011
    Date of Patent: December 16, 2014
    Assignee: RealD Inc.
    Inventors: Michael G. Robinson, Terry W. Norton
  • Patent number: 8861063
    Abstract: An optical control apparatus includes: an optical input/output port to which light is input from outside or from which light is output outside; a spatial optical modulator that emits light having entered from the optical input/output port towards the optical input/output port and has polarization dependence; a condensing element that is disposed between the optical input/output port and the spatial optical modulator and optically couples the optical input/output port and the spatial optical modulator; and a polarization control element that is disposed between the condensing element and the spatial optical modulator, controls a polarization state of input light to cause the input light to have only a single polarization direction, and outputs the input light controlled.
    Type: Grant
    Filed: April 26, 2013
    Date of Patent: October 14, 2014
    Assignee: Furukawa Electric Co., Ltd.
    Inventors: Hiroshi Matsuura, Atsushi Oguri
  • Patent number: 8861066
    Abstract: The present invention relates to a reconfigurable micro-mechanical light modulator including a two-dimensional array of modulating elements with redundant rows of modulating elements. In particular, it relates to extending the life of the modulator by shifting the set of elements used, without physically replacing the micro-mechanical light modulator. The modulating elements are adapted to modulate light impinging on the micro-mechanical light modulator. The array of modulating elements comprises a first and a second set of modulating elements. The second set is a redundant set of modulating elements that can be selected to substitute for the first set of modulating elements in modulating light impinging on the micro-mechanical light modulator, without physically replacing the micro-mechanical light modulator. Devices and methods are described.
    Type: Grant
    Filed: February 16, 2010
    Date of Patent: October 14, 2014
    Assignee: Micronic AB
    Inventors: Per Askebjer, Torbjörn Sandström
  • Publication number: 20140300838
    Abstract: The disclosure provides a light modulating module attached on a display side of a reflective display apparatus, including: a light source portion capable of providing an illumination light beam, wherein the illumination light beam is capable of being transmitted to the reflective display apparatus, and the reflective display apparatus is adapted to reflect the illumination light beam to generate an image light beam; and an image light modulating device is disposed above the reflective display apparatus and disposed in a light path of the image light beam, wherein the image light modulating device is capable of modulating a direction and/or a polarization state of the image light beam, and the image light beam is emitted to either a left or right eye of a viewer to form an autostereoscopic image perceivable to the viewer after the image light beam passes through the image light modulating device.
    Type: Application
    Filed: April 3, 2013
    Publication date: October 9, 2014
    Applicant: DELTA ELECTRONICS, INC.
    Inventors: Yeong-Feng WANG, Ming-Wei TSAI, Keh-Su CHANG, Rong-Chang LIANG
  • Patent number: 8810886
    Abstract: A display system includes a coherent light source that can emit a coherent light beam, a de-speckling device configured to distort a wavefront of the coherent light beam to produce a distorted coherent light beam, and a two-dimensional array of light modulators that can selectively modulate the distorted coherent light beam to select a plurality of pixels for display.
    Type: Grant
    Filed: February 7, 2012
    Date of Patent: August 19, 2014
    Assignee: Spatial Photonics, Inc.
    Inventors: Vlad Novotny, Gabriel Matus, Michel Combes
  • Patent number: 8787709
    Abstract: A method for optical chirp-free optical polarization modulation includes dividing a data modulated optical signal into a first optical path and a second optical path, using a Mach-Zehnder intensity modulator in the first optical path for imparting a ? phase difference between adjacent symbols of the data modulated optical signal in the first optical path, adjusting a delay and amplitude of symbols of the data modulated optical signal in the second path so that the symbols in the first path and the symbols in the second path are synchronized and have substantially equal power levels, and combining the first and second optical paths so that symbols from the first and second optical paths are in orthogonal polarizations.
    Type: Grant
    Filed: March 30, 2012
    Date of Patent: July 22, 2014
    Assignee: NEC Laboratories America, Inc.
    Inventors: Fatih Yaman, Shaoliang Zhang, Lei Xu, Ting Wang, Yoshihisa Inada, Takaaki Ogata, Yasuhiro Aoki
  • Patent number: 8774567
    Abstract: A polarization conversion device converts a polarization state of a light which is input to a first waveguide, that is, TE/TM mode of the light, to output it from the first waveguide. The polarization conversion device includes: a mode converter that performs the inter-conversion of TE/TM modes of the light which is input to the first waveguide; and a polarization separator that receives the light passed through the mode converter and separates the received light into a first light, TE/TM of which mode has been converted by the mode converter and a second light, TE/TM of which mode has not been converted, to output the first light to the first waveguide.
    Type: Grant
    Filed: August 30, 2012
    Date of Patent: July 8, 2014
    Assignee: Fujitsu Limited
    Inventors: Masaharu Doi, Kazuhiro Tanaka
  • Publication number: 20140118813
    Abstract: There is provided a light-guide, compact collimating optical device, including a light-guide having a light-waves entrance surface, a light-waves exit surface and a plurality of external surfaces, a light-waves reflecting surface carried by the light-guide at one of the external surfaces, two retardation plates carried by light-guides on a portion of the external surfaces, a light-waves polarizing beamsplitter disposed at an angle to one of the light-waves entrance or exit surfaces, and a light-waves collimating component covering a portion of one of the retardation plates. A system including the optical device and a substrate, is also provided.
    Type: Application
    Filed: January 7, 2014
    Publication date: May 1, 2014
    Applicant: Lumus Ltd
    Inventors: Yaakov Amitai, Mali Hadad, Naamah Friedmann
  • Patent number: 8705901
    Abstract: A method for making a polarization rotator includes the steps of forming a structure including a semiconductor substrate and a mesa part, forming a first semiconductor layer on a main surface of the semiconductor substrate and around the mesa part, forming a second semiconductor layer on the first semiconductor layer, forming a semiconductor laminate by forming a third semiconductor layer on the second semiconductor layer, forming a mask layer on the third semiconductor layer, forming a mesa including a first semiconductor core by etching the semiconductor laminate, and forming a first semiconductor cladding by forming a fourth semiconductor layer around the mesa. The first semiconductor core and the first semiconductor cladding form a polarization rotating unit. An inclined surface of a mesa-part-adjacent portion extends in a second direction forming an acute angle with the main surface. An inclined portion of the second semiconductor layer extends in the second direction.
    Type: Grant
    Filed: February 21, 2012
    Date of Patent: April 22, 2014
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Chie Fukuda
  • Publication number: 20140098409
    Abstract: A light modulator includes a band-pass filter configured to select a wavelength of an incident light; a first layer; a second layer configured to include a trench with a bottom surface, a side surface, and a top surface; a thin metal film provided on the side surface of the trench of the second layer; and a dielectric layer provided between the first and second layers at the bottom and the top surfaces of the trench. An electric field is applied to the dielectric layer by using the first and second layers. The dielectric layer is provided between the thin metal film and the first layer at the side surface of the second layer so that the thin metal film has an anisotropic permittivity due to the electric field.
    Type: Application
    Filed: October 4, 2013
    Publication date: April 10, 2014
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Mamoru Miyawaki
  • Patent number: 8687260
    Abstract: A spatial light modulator comprises a solid-state chiral material disposed between electrodes such that the polarization direction of the polarized light incident thereto can be controlled through an electrical field established between the electrodes.
    Type: Grant
    Filed: December 28, 2007
    Date of Patent: April 1, 2014
    Assignee: Texas Instruments Incorporated
    Inventor: Simon Joshua Jacobs
  • Publication number: 20140055754
    Abstract: An illumination system, a projection device, and an illumination method are provided. The illumination system includes a polarized light source, a polarization switching element, a beam splitting element, a wavelength conversion element, a reflective element, and a wave plate. The polarized light source emits a polarized light beam with a first color. The polarization switching element switches a polarized direction of the polarized light beam at different time points. The beam splitting element separates polarized light beams having different polarized directions. The wavelength conversion element converts the polarized light beam having a first polarized direction to a converted light beam. The reflective element reflects the polarized light beam having a second polarized direction to form a reflected light beam. The beam splitting element combines the converted light beam and the reflected light beam comes from the wave plate disposed between the beam splitting element and the reflective element.
    Type: Application
    Filed: February 26, 2013
    Publication date: February 27, 2014
    Applicant: Young Optics Inc.
    Inventors: Keng-Han Chuang, Teng-Hung Hung
  • Patent number: 8599465
    Abstract: A method for making an electrowetting device includes: (a) forming a surrounding wall on an upper surface of a substrate to surround a microchamber, the surrounding wall having an inner surface surrounding the microchamber and a top surface above the inner surface, the upper surface of the substrate being non-hydrophobic; (b) coating the surrounding wall and the upper surface of the substrate with a hydrophobic coating material; (c) removing a portion of the hydrophobic coating material formed on the top surface of the surrounding wall, thereby exposing the top surface of the surrounding wall; and (d) disposing a liquid into the microchamber.
    Type: Grant
    Filed: September 23, 2010
    Date of Patent: December 3, 2013
    Assignee: Incha Hsieh
    Inventor: Incha Hsieh
  • Publication number: 20130301094
    Abstract: Embodiments of the present invention provide systems and methods to robustly inter-convert between polarization-entangled photon pairs and time-entangled photon pairs, such that produced polarization-entangled photons pairs can be converted into time-entangled photon pairs, stored as time-entangled photon pairs to preserve the entanglement for longer periods of time, and then converted back to polarization-entangled photon pairs when ready for manipulation, processing, and measurement by a quantum application.
    Type: Application
    Filed: April 3, 2013
    Publication date: November 14, 2013
    Applicant: The MITRE Corporation
    Inventors: Gerald N. GILBERT, Jonathan S. Hodges, Stephen Peter Pappas, Yaakov Shmuel Weinstein
  • Patent number: 8576206
    Abstract: The present invention relates to a phase modulating apparatus capable of highly accurately and easily correcting the phase modulation characteristic of a reflective electric address spatial light modulator even when a condition of input light is changed. In the LCOS phase modulating apparatus, an input unit inputs the condition of the input light, and a processing unit sets an input value for each pixel. A correction value deriving unit determines a correction condition according to the condition of the input light. A control input value converting unit converts the input value set for each pixel into a corrected input value based on the correction condition. An LUT processing unit converts the corrected input value into a voltage value, and drives each pixel by using a drive voltage equivalent to the converted voltage value.
    Type: Grant
    Filed: December 4, 2008
    Date of Patent: November 5, 2013
    Assignee: Hamamatsu Photonics K.K.
    Inventors: Naoya Matsumoto, Norihiro Fukuchi, Takashi Inoue, Yasunori Igasaki