Amplitude Modulation Patents (Class 359/276)
  • Patent number: 11880116
    Abstract: An optical DAC includes a 1:N splitter that splits a single light beam into N light beams corresponding to bits of an N-bit electrical digital signal (where N is an integer of 2 or more) and makes the N light beams different in optical intensities such that (N?1) light beams corresponding to bits except a least significant bit of the N-bit electrical digital signal each have an optical intensity which is four times as large as an optical intensity of a light beam corresponding to a next less significant bit, an optical intensity modulator that individually intensity-modulates the N light beams, an N:1 combiner that combines the N output light beams intensity-modulated by the optical intensity modulator and outputs the combined light, and a phase shifter that is adjustable such that the light beams that are combined by the N:1 combiner are made in phase.
    Type: Grant
    Filed: June 21, 2019
    Date of Patent: January 23, 2024
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Shota Kita, Akihiko Shinya, Masaya Notomi, Kengo Nozaki
  • Patent number: 11838615
    Abstract: A terminal device includes a display unit, and an outer case, a first light sensing unit, and a second light sensing unit. The display unit has a display screen. The display unit displays images on the display screen. The outer case receives the display unit. The first light sensing unit is located below the display unit and configured to sense incident light transmitted through the display screen. The second light sensing unit is placed inside the outer case when deactivated, and extends outside the outer case when activated. Also, a dual front-facing camera operating method is provided.
    Type: Grant
    Filed: November 5, 2020
    Date of Patent: December 5, 2023
    Assignee: GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., LTD.
    Inventor: Chang Liu
  • Patent number: 11342991
    Abstract: A light source (12) outputs a light (L1). A branching unit (13) branches the light (L1) output from the light source (12) into a first branched light (L2) and a local oscillation light (LO). A modulator (14) modulates the first branched light (L2) to output an optical signal (LS1). A receiver (15) causes the local oscillation light (LO) to interfere with an optical signal (LS2) to receive the optical signal (LS2). An EDFA (16) amplifies the optical signal (LS1) output from the modulator (14). An excitation light source (17) outputs an excitation light (Le) exciting the EDFA (16) to the EDFA (16). An optical attenuator (18) attenuates optical power of the optical signal (LS1) amplified by the EDFA (16). A control unit (11) controls attenuation of the optical signal (LS1) in the optical attenuator (18). The control unit (11) adjusts the attenuation of the optical signal (LS1) and adjusts an output of the excitation light (Le) from the excitation light source (17).
    Type: Grant
    Filed: January 6, 2021
    Date of Patent: May 24, 2022
    Assignee: NEC CORPORATION
    Inventor: Isao Tomita
  • Patent number: 10967566
    Abstract: An apparatus and a method for powder bed fusion additive manufacturing involve a multiple-chamber design achieving a high efficiency and throughput. The multiple-chamber design features concurrent printing of one or more print jobs inside one or more build chambers, side removals of printed objects from build chambers allowing quick exchanges of powdered materials, and capabilities of elevated process temperature controls of build chambers and post processing heat treatments of printed objects. The multiple-chamber design also includes a height-adjustable optical assembly in combination with a fixed build platform method suitable for large and heavy printed objects.
    Type: Grant
    Filed: October 27, 2016
    Date of Patent: April 6, 2021
    Assignee: SEURAT TECHNOLOGIES, INC.
    Inventors: James A. DeMuth, Erik Toomre, Francis L. Leard, Kourosh Kamshad, Heiner Fees, Eugene Berdichevsky
  • Patent number: 10917172
    Abstract: A light source outputs a light. A branching unit branches the light output from the light source into a first branched light and a local oscillation light. A modulator modulates the first branched light to output an optical signal. A receiver causes the local oscillation light to interfere with an optical signal to receive the optical signal. An EDFA amplifies the optical signal output from the modulator. An excitation light source outputs an excitation light exciting the EDFA to the EDFA. An optical attenuator attenuates optical power of the optical signal amplified by the EDFA. A control unit controls attenuation of the optical signal in the optical attenuator. The control unit adjusts the attenuation of the optical signal and adjusts an output of the excitation light from the excitation light source.
    Type: Grant
    Filed: May 25, 2018
    Date of Patent: February 9, 2021
    Assignee: NEC Corporation
    Inventor: Isao Tomita
  • Patent number: 10880003
    Abstract: Even in a case where light sources at an optical transmission-side and an optical reception-side are made into a common light source, a optical transmission function and an optical reception function are enabled to be used at a time.
    Type: Grant
    Filed: September 19, 2019
    Date of Patent: December 29, 2020
    Assignee: NEC Corporation
    Inventor: Hiroshi Yamamoto
  • Patent number: 10734212
    Abstract: A ring stacked accelerator for use in a mass spectrometer includes a plurality of ring shaped plates arranged in a stack and is electrically coupled to a voltage divider that allows a substantially homogeneous electric field to be produced when the stack is energized. The voltage divider can include resistors and capacitors, where the capacitors are chosen to compensate for parasitic capacitances experienced by the plates. The ring stacked accelerator can be energized using an RF pulse. The ring stack accelerator can include one or more balancing capacitors for correcting effects that cause nonlinearity.
    Type: Grant
    Filed: December 20, 2014
    Date of Patent: August 4, 2020
    Assignee: DH Technologies Development Pte. Ltd.
    Inventors: Robert Haufler, William M. Loyd, Alexander Tsipirovich
  • Patent number: 10718991
    Abstract: Some embodiments are directed to a generating device, including a pulse laser source providing primary photons having at least one wavelength, shaping device(s) acting on the primary photons to provide an input beam, a nonlinear crystal, and controller(s) generating, in the nonlinear crystal, at least one electric field that is synchronous with the input beam and suitable for inducing a phase mismatching in the nonlinear crystal through an electro-optical effect, in order to convert the primary photons of the input beam into secondary photons having wavelengths belonging to a supercontinuum.
    Type: Grant
    Filed: January 20, 2017
    Date of Patent: July 21, 2020
    Assignees: CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, UNIVERSIT√Č DE LIMOGES
    Inventors: Katarzyna Krupa, Badr Shalaby, Alexis Labruyère, Alessandro Tonello, Vincent Couderc
  • Patent number: 10447387
    Abstract: Even in a case where light sources at an optical transmission-side and an optical reception-side are made into a common light source, a optical transmission function and an optical reception function are enabled to be used at a time.
    Type: Grant
    Filed: December 28, 2016
    Date of Patent: October 15, 2019
    Assignee: NEC Corporation
    Inventor: Hiroshi Yamamoto
  • Patent number: 10416498
    Abstract: A spatial light modulator (SLM) configured to reduce a fringe field effect (FFE) is provided. The SLM comprises pixels each having a liquid crystal (LC) on a pixel region. At least one pixel is an optimized pixel. The LC of the optimized pixel has an inhomogeneous distribution of pretilt angle or anchoring energy over the pixel region. The inhomogeneous distribution is selected to oppose the FFE. In one embodiment, the optimized pixel is partitioned into an outer region and an interior region. The outer region is an area between the optimized-pixel boundary and a pre-determined distance inwardly therefrom. The inhomogeneous distribution has one value of the pretilt angle or anchoring energy over the outer region and another value over the interior region. In another embodiment, a polymer stabilized network with an inhomogeneous polymerization degree over the pixel region is used to configure the LC layer to oppose the FFE.
    Type: Grant
    Filed: December 13, 2016
    Date of Patent: September 17, 2019
    Assignee: Hong Kong Applied Science and Technology Research Institute Company Limited
    Inventor: Cheng-Hsing Liao
  • Patent number: 10158504
    Abstract: In a transmission system, a transmission signal is generated from transmission data. The transmission signal has a series of shaped pulses, such as raised-cosine or root-raised-cosine shaped pulses. A reception signal, based on the transmission signal having passed through a transmission channel, is sampled to generate sampled digital data. The sampled digital data is filtered through a super-Gaussian filter to regenerate the transmission data.
    Type: Grant
    Filed: January 29, 2018
    Date of Patent: December 18, 2018
    Assignee: Roshmere, Inc.
    Inventors: Nikola Alic, Eduardo Temprana Giraldo
  • Patent number: 10078209
    Abstract: Disclosed is an optical assembly including: a case provided with a first optical path, which passes light from a first light source, and a second optical path, which communicates with a side of the first optical path and introduces the light from a second light source into the first optical path; and a beam splitter that divides the first optical path into an irradiation area in a front side and an incident area in a rear side, maintains a traveling direction with respect to the light irradiated from the first light source, and changes the traveling direction of the light from the second light source so that the light from the second light source can travel parallel to the light irradiated from the first light source. The centerline of the irradiation area and a centerline of the incidence area are not parallel to each other.
    Type: Grant
    Filed: July 12, 2017
    Date of Patent: September 18, 2018
    Assignee: INTHESMART INC.
    Inventors: Uk Kang, Ilhyung Shin
  • Patent number: 9755751
    Abstract: An optical transceiver of a flexible modulation format. The optical transceiver may include an optical transmitter to convert an electrical signal to an optical signal and transmit the optical signal, an optical receiver to receive and convert the optical signal to an electrical signal, and a controller to set modulation formats of the optical transmitter and the optical receivers according to modulation format information.
    Type: Grant
    Filed: February 5, 2016
    Date of Patent: September 5, 2017
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Joon Young Huh, Jong Hyun Lee, Jyung Chan Lee, Joon Ki Lee, Sae Kyoung Kang
  • Patent number: 9678277
    Abstract: A filter includes two translucent bodies. Each of the translucent bodies has a first plane, a second plane that forms a wedge angle with the first plane, and a third plane that intersects with both the first plane and the second plane, first planes of the two translucent bodies are parallel to each other, and second planes of the two translucent bodies are parallel to each other. The filter also comprises a beam splitting film, where surfaces of both sides are respectively combined with the first planes of the two translucent bodies. Two reflective films are combined, respectively, with the second planes of the two translucent bodies.
    Type: Grant
    Filed: November 25, 2015
    Date of Patent: June 13, 2017
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Min Zhou, Lei Wang, Huafeng Lin, Zhenxing Liao
  • Patent number: 9584220
    Abstract: Even in a case where light sources at an optical transmission-side and an optical reception-side are made into a common light source, a optical transmission function and an optical reception function are enabled to be used at a time.
    Type: Grant
    Filed: March 11, 2014
    Date of Patent: February 28, 2017
    Assignee: NEC Corporation
    Inventor: Hiroshi Yamamoto
  • Patent number: 9583907
    Abstract: A system for generating an optical signal having a preselected waveform includes: a laser source; a first waveform generator configured to apply a first signal to the laser source to create a laser output; an intensity modulator configured to receive the laser output; a second waveform generator configured to apply a second signal to the intensity modulator, the intensity modulator being configured to generate a pre-distorted laser signal based on the second signal and the laser output.
    Type: Grant
    Filed: April 11, 2014
    Date of Patent: February 28, 2017
    Assignee: RAYTHEON COMPANY
    Inventors: Brian F. Boland, Robert D. Stultz, David M. Filgas, Jean-Paul Bulot
  • Patent number: 9577656
    Abstract: A method, including receiving an input analog signal containing noise at a specific noise frequency and digitizing the input analog signal to form a digitized signal. The method also includes recovering a first amplitude and a first phase of the noise from the digitized signal, and generating an analog correction signal at the specific noise frequency. The analog correction signal has a second amplitude equal to the first amplitude and a second phase opposite to the first phase. The method further includes summing the input analog signal with the analog correction signal to generate an output analog signal.
    Type: Grant
    Filed: February 19, 2015
    Date of Patent: February 21, 2017
    Assignee: Biosense Webster (Israel) Ltd.
    Inventor: Assaf Govari
  • Publication number: 20150131995
    Abstract: The optical module includes an optical component, a substrate, and a laser, an electro-absorption modulator, and a semiconductor optical amplifier that grow on the substrate, where: the electro-absorption modulator is located between the laser and the semiconductor optical amplifier; the laser is configured to output an optical signal after power-on; the electro-absorption modulator is configured to perform signal modulation on the optical signal output by the laser; the semiconductor optical amplifier is configured to amplify the optical signal modulated by the electro-absorption modulator; the optical component is configured to perform deflection and convergence for the optical signal amplified by the semiconductor optical amplifier and output the optical signal.
    Type: Application
    Filed: December 2, 2014
    Publication date: May 14, 2015
    Applicant: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Liping WANG, Xiquan DAI
  • Publication number: 20150124309
    Abstract: Methods and apparatus for finding a bias voltage (20) corresponding to a quadrature point of an optical modulator, the modulator comprising a biasable component which is configurable to be biased by application of the bias voltage (20) such that the modulator operates at quadrature, the method comprising: providing a target for the output power of the modulator which corresponds to quadrature; applying, to the biasable component, a bias voltage (20) having an initial value; thereafter, finding a value for the bias voltage (20) that biases the biasable component such that the output power of the modulator is within a pre-defined range of the target by, starting at the initial value, alternately increasing and decreasing (or decreasing and increasing) the bias voltage (20) with gradually increasing amplitude; and identifying the found value for the bias voltage (20) as a bias voltage corresponding to a quadrature point of the optical modulator.
    Type: Application
    Filed: April 30, 2013
    Publication date: May 7, 2015
    Applicant: BAE SYSTEMS plc
    Inventors: Andrew James Smith, Mohammed Nawaz, Simon Charles Giles
  • Publication number: 20150088385
    Abstract: A device for assisting the nighttime driving of a motor vehicle fitted with a lighting device for emitting a beam for illuminating the road scene in front of the vehicle, the illumination emitted by the lighting device being variable periodically between a maximum value and a minimum value, the device including at least one variable-transmission screen placed between the road scene and the driver, the coefficient of transmission of the screen being variable periodically between a maximum value and a minimum value, the switching on of at least one light source of the lighting device and the coefficient of transmission of the variable-transmission screen controlled by the control unit, the illumination reaching its maximum value when the coefficient of transmission of the screen reaches its maximum value. The control unit controls a circuit for regulating the power supply and a transmitter of remote control waves toward a receiver.
    Type: Application
    Filed: March 22, 2013
    Publication date: March 26, 2015
    Applicant: Valeo Vision
    Inventor: Benoist Fleury
  • Patent number: 8983241
    Abstract: Techniques are described to form an optical waveguide switch that could reach a very high extinction ratio. In particular, this disclosure describes an asymmetric MZI, in which different waveguide capacitor structures are used in two arms of the MZI: a first arm with a waveguide capacitor to achieve the mainly phase modulation and a second arm with a waveguide capacitor to achieve mainly the magnitude modulation, respectively. Using the asymmetric MZI in accordance with this disclosure, one can design an algorithm to achieve almost unlimited extinction ration during the switching operation.
    Type: Grant
    Filed: December 22, 2011
    Date of Patent: March 17, 2015
    Inventor: Bing Li
  • Publication number: 20150002920
    Abstract: A system and methods for electro-optical modulation are presented. A first optical signal and a second optical signal are optically coupled to produce a local oscillator signal propagated in two signal paths. The local oscillator signal in the first signal path and the second signal path is electro-optically phase modulated with a radio frequency electrical signal to produce a first phase modulated optical signal and a second phase modulated optical signal respectively. The first phase modulated optical signal and the second phase modulated optical signal are optically coupled to produce an intensity modulated signal comprising an RF frequency of the radio frequency electrical signal frequency mixed by a local oscillator frequency of the local oscillator signal.
    Type: Application
    Filed: July 1, 2013
    Publication date: January 1, 2015
    Inventor: Yongqiang Shi
  • Patent number: 8902488
    Abstract: Systems for switching optical signals are disclosed. Such a system may include a splitter and a plurality of polarizing filters. The splitter may be configured to receive emitted light and duplicate the emitted light into a plurality of light copies. Each polarizing filter may have a polarization and may be operably connected to the splitter. In addition, each polarizing filter may be configured to receive at least one of the plurality of light copies, filter the at least one of the plurality of received light copies such that light having a similar polarization as that of the polarizing filter passes through the polarizing filter, and output one of a plurality of outputs.
    Type: Grant
    Filed: June 28, 2012
    Date of Patent: December 2, 2014
    Assignee: Accipiter Systems, Inc.
    Inventors: David Jeffrey Graham, David Markham Drury, Eric John Helmsen
  • Patent number: 8879921
    Abstract: The invention relates to an apparatus and a method for modulation of an optical signal with a data signal, said apparatus (6) comprising a configurable digital encoding unit (8) encoding data of said data signal to provide an encoded modulation control signal (EMCS), and a signal modulation unit (9) modulating said optical signal with respect to its signal phase and/or signal amplitude in orthogonal polarization directions in response to said encoded modulation control signal (EMCS) to generate a multi-dimensional optical signal vector.
    Type: Grant
    Filed: May 31, 2011
    Date of Patent: November 4, 2014
    Assignee: Adva Optical Networking SE
    Inventor: Michael Eiselt
  • Patent number: 8818204
    Abstract: A light transmitter receives a low-rate data signal having a low data rate and a high-rate data signal having a high data rate that is greater than the low data rate. The transmitter includes a light source and a light modulator to modulate the light source based on logic levels of the high-rate data signal and logic levels of the low-rate data signal, to produce modulated light that concurrently conveys the logic levels of the low-rate data signal and the logic levels of the high-rate data signal.
    Type: Grant
    Filed: April 30, 2012
    Date of Patent: August 26, 2014
    Assignee: Intel Corporation
    Inventor: Richard D. Roberts
  • Patent number: 8754844
    Abstract: Provided is a display device using electrowetting including a reservoir layer in which a reservoir for storing oil and transparent water-soluble liquid is formed. A first electrode and a second electrode may be formed on an upper surface of the reservoir layer and on an inner wall of the reservoir, respectively.
    Type: Grant
    Filed: August 11, 2010
    Date of Patent: June 17, 2014
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Jung-mok Bae
  • Patent number: 8630828
    Abstract: Methods are disclosed for computer modeling of amplitude modulated light in dispersive optical systems. Ray tracings are extended to include calculations of the modulated phase for the rays. Examples are given for electronic distance measurement instrument applications.
    Type: Grant
    Filed: February 26, 2013
    Date of Patent: January 14, 2014
    Inventor: David H. Parker
  • Patent number: 8624961
    Abstract: The present invention relates to a method and an apparatus for 3-D display based on random constructive interference. It produces a number of discrete secondary light sources by using an amplitude-phase-modulator-array, which helps to create 3-D images by means of constructive interference. Next it employs a random-secondary-light-source-generator-array to shift the position of each secondary light source to a random place, eliminating multiple images due to high order diffraction. It could be constructed with low resolution liquid crystal screens to realize large size real-time color 3-D display, which could widely be applied to 3-D computer or TV screens, 3-D human-machine interaction, machine vision, and so on.
    Type: Grant
    Filed: January 23, 2009
    Date of Patent: January 7, 2014
    Inventor: Zhiyang Li
  • Patent number: 8625047
    Abstract: A fluid ingress resistant interactive display device is disclosed herein. The device includes one or more gasket layers to serve as a fluid barrier to resist fluid from entering an interior of the device.
    Type: Grant
    Filed: May 31, 2011
    Date of Patent: January 7, 2014
    Assignee: Microsoft Corporation
    Inventors: Bernie Schultz, Rajesh Manoher Dighde
  • Publication number: 20140002885
    Abstract: Systems for switching optical signals are disclosed. Such a system may include a splitter and a plurality of polarizing filters. The splitter may be configured to receive emitted light and duplicate the emitted light into a plurality of light copies. Each polarizing filter may have a polarization and may be operably connected to the splitter. In addition, each polarizing filter may be configured to receive at least one of the plurality of light copies, filter the at least one of the plurality of received light copies such that light having a similar polarization as that of the polarizing filter passes through the polarizing filter, and output one of a plurality of outputs.
    Type: Application
    Filed: June 28, 2012
    Publication date: January 2, 2014
    Applicant: ACCIPITER SYSTEMS, INC.
    Inventors: David Jeffrey Graham, David Markham Drury, Eric John Helmsen
  • Publication number: 20130335795
    Abstract: Provided is a complex spatial light modulator and a holographic 3D image display including the complex spatial light modulator. The complex spatial light modulator includes a spatial light modulator for modulating a phase or an amplitude of light, a pair of lens arrays, and a grating disposed between the pair of lens arrays. Accordingly, the phase and the amplitude of light may be modulated simultaneously.
    Type: Application
    Filed: June 7, 2013
    Publication date: December 19, 2013
    Inventors: Hoon SONG, Hong-seok LEE, Gee-young SUNG, Kang-hee WON, Kyu-hwan CHOI
  • Patent number: 8588621
    Abstract: A simple and effective all-optical system, producing a multilevel coded optical signal based on the M-ASK technology and by the minimized equipment. The novel all-optical modulation technique for optical M-ASK generation is based on nonlinear interaction between optical signals, say between N 2-ASK modulated pump signals having extinction ratio ER1 and a single 2-ASK modulated optical probe signal having extinction ratio ER2. According to the invention, a 4-ASK optical signal can be obtained using just a single binary modulated pump optical signal and a single binary modulated probe optical signal.
    Type: Grant
    Filed: May 19, 2008
    Date of Patent: November 19, 2013
    Assignee: ECI Telecom Ltd.
    Inventors: David Jimmy Dahan, Uri Mahlab
  • Patent number: 8520306
    Abstract: Apparatus for combining laser radiation (1) 5 which apparatus comprises a seed laser (2), a splitter (3), a plurality of amplifier chains (4), a reference amplifier chain (7), detection means (5). demodulator means (6), and phase control means (12), wherein each of the amplifier chains (4) comprises at least one optical amplifier (11), optical radiation (17) emitted from the seed laser (2) is split into the plurality of amplifier chains (4) by the splitter (3).
    Type: Grant
    Filed: October 23, 2009
    Date of Patent: August 27, 2013
    Assignee: SPI Lasers UK Ltd
    Inventors: Malcolm Paul Varnham, Mikhail Nickolaos Zervas, Fabio Ghiringhelli, Andrew Thomas Harker
  • Patent number: 8463324
    Abstract: An antenna and power amplifier element assembly may include an antenna assembly and a quasi-optic power amplifier. The quasi-optic power amplifier may include an output transistor coupled to the antenna assembly. A harmonic trap may be coupled to the quasi-optic power amplifier.
    Type: Grant
    Filed: December 18, 2009
    Date of Patent: June 11, 2013
    Assignee: The Boeing Company
    Inventors: Brian K. Kormanyos, Jeremy Popp, Timothy T. Lee, Alfred E. Lee, Gregory A. Kromholtz
  • Publication number: 20130141772
    Abstract: An apparatus comprising a circuit configured to couple to a nested Mach-Zehnder modulator (MZM), the circuit configured to receive a first signal proportional to a sum of an in-phase (I) component and a quadrature (Q) component, receive a second signal that is proportional to a difference between the I component and the Q component, and generate a difference signal as a difference in intensity between the first signal and the second signal, and a controller configured to provide a bias signal to the nested MZM to control a phase difference between the I component and the Q component, wherein the bias signal is based on the difference signal.
    Type: Application
    Filed: October 12, 2012
    Publication date: June 6, 2013
    Applicant: FUTUREWEI TECHNOLOGIES, CO.
    Inventor: Futurewei Technologies, Co.
  • Patent number: 8427725
    Abstract: The present invention relates to a light modulating device, comprising a SLM and a pixelated optical element, in which a group of at least two adjacent pixels of the SLM in combination with a corresponding group of pixels in the pixelated optical element form a macropixel, the pixelated optical element being of a type such that its pixels comprise a fixed content, each macropixel being used to represent a numerical value which is manifested physically by the states of the pixels of the SLM and the content of the pixels of the pixelated optical element which form the macropixel.
    Type: Grant
    Filed: October 20, 2008
    Date of Patent: April 23, 2013
    Assignee: Seereal Technologies S.A.
    Inventors: Gerald Futterer, Bo Kroll, Steffen Buschbeck
  • Patent number: 8405897
    Abstract: An electrically controlled optical oscillator for a single subcarrier optical phase-locked loop, which includes: an electrically controlled electrical oscillator having an input, which receives an electrical driving input signal, and an output, which supplies an electrical driving output signal that has a frequency that is a function of the electrical driving input signal; a continuous-wave laser source, which supplies an optical carrier; and an optical modulator, which has an optical input connected to the laser source and receives the optical carrier, an electrical input, which is connected to the output of the electrically controlled electrical oscillator and receives the electrical driving output signal, and an optical output that modulates the optical carrier with the electrical driving output signal and generates an optical modulated signal. The optical modulator generates an optical modulated signal with single optical subcarrier.
    Type: Grant
    Filed: August 6, 2008
    Date of Patent: March 26, 2013
    Assignee: Instituto Superiore Mario Boella Sulle Technologie Dell 'Informazione E Delle Telecommunicazioni
    Inventors: Valter Ferrero, Stefano Camatel
  • Patent number: 8391724
    Abstract: Included are a first modulator, a second modulator, a first optical amplifier that amplifies an output of the first modulator at an amplification factor based on a first bias signal, a second optical amplifier that amplifies an output of the second modulator at an amplification factor based on a second bias signal, an optical phase adjuster that phase-rotates an output of the second optical amplifier, an optical multiplexer that multiplexes an output of the first optical amplifier with an output of the optical phase adjuster, and a second bias corrector that generates a first pulse signal and a second pulse signal, which are complementary to each other, and obtains a first bias value and a second bias value based on a change of strength of an output signal of the optical multiplexer. The first and second pulse signals are superimposed on the first and second bias signals, respectively.
    Type: Grant
    Filed: February 17, 2011
    Date of Patent: March 5, 2013
    Assignee: Mitsubishi Electric Corporation
    Inventors: Hiroshi Aruga, Keita Mochizuki, Atsushi Sugitatsu
  • Patent number: 8379291
    Abstract: The designed resonator system comprises a light source generating device for outputting a light source and a resonating cavity device. The resonating cavity device includes: a first waveguide with an input end for receiving the light source; a first resonator disposed adjacent to the first waveguide for receiving the light source coupled from the first waveguide in order to generate a resonating light source; a second waveguide having one end disposed adjacent to the first resonator, an adapting end for receiving the resonating light source coupled from the first resonator, and an output end; and an electro-optic modulator disposed adjacent to the other end of the second waveguide for receiving the resonating light source coupled from the second waveguide and generating an optical modulating signal by an electrical modulating signal, and the optical modulating signal is outputted from the output end of the second waveguide.
    Type: Grant
    Filed: January 4, 2010
    Date of Patent: February 19, 2013
    Assignee: National Tsing Hua University
    Inventors: Shiuh Chao, Chih-T'sung Shih, Zhi-Wei Zeng
  • Patent number: 8368994
    Abstract: A scanned, one-dimensional, phased-array display system combines imaging optics on one axis with Fourier transform optics on another. The display offers the energy efficiency and fault tolerance of phase modulator-based displays, and the compactness, flexibility and speed of optical MEMS. Also described is a mechanism to introduce amplitude variations on the Fourier axis if needed to compensate for image artifacts.
    Type: Grant
    Filed: June 28, 2008
    Date of Patent: February 5, 2013
    Assignee: Alces Technology, Inc.
    Inventor: David M. Bloom
  • Publication number: 20130027763
    Abstract: An apparatus and methods for generating multi-level output signals for use by an optical modulator are provided. The apparatus comprises a plurality of input signal lines each configured to receive a binary input signal, an output signal line and a plurality of amplifier stages. The amplifier stages are each connected between one of the input signal lines and the output signal line so as to each produce an output voltage on the output signal line of either a first level or a second level. The level of the output voltage is based on the binary signal at the respective input signal line, and the output voltages of the respective plurality of amplifier stages collectively produce a summed analog output voltage on the output signal line at two or more different levels each configured to drive an optical modulator.
    Type: Application
    Filed: July 27, 2011
    Publication date: January 31, 2013
    Applicant: CISCO TECHNOLOGY, INC.
    Inventors: Juergen Hauenschild, Chris Fludger, Thomas Duthel
  • Publication number: 20130004175
    Abstract: An optical modulator and a method for operating the optical modulator are provided, the optical modulator contains at least two semiconductor optical amplifier sections that are arranged in a cascaded structure. An information signal is applicable to one of the semiconductor optical amplifier sections and an inverse information signal is applicable to another of the semiconductor optical amplifier sections. In addition, a communication system containing at least one such modulator is suggested.
    Type: Application
    Filed: February 22, 2011
    Publication date: January 3, 2013
    Applicant: NOKIA SIEMENS NETWORKS OY
    Inventors: Tiago Silveira, Ana Ferreira
  • Publication number: 20120293856
    Abstract: An optical delay device includes an optical path in which an input optical signal travels the same path recursively; an optical switch that switches between an output state of outputting the optical signal input to the optical path, and a non-output state of not outputting the optical signal input to the optical path; and a controller that sets the optical switch to the non-output state until a point in time when a given delay time elapses since input of the optical signal to the optical path and at the point in time when the given delay time elapses, switches the optical switch to the output state.
    Type: Application
    Filed: March 20, 2012
    Publication date: November 22, 2012
    Applicant: FUJITSU LIMITED
    Inventor: Miki ONAKA
  • Patent number: 8280054
    Abstract: Various embodiments of the present invention are directed to scrambling-descrambling systems for encrypting and decrypting electromagnetic signals transmitted in optical and wireless networks. In one aspect, a system (1302) for scrambling electromagnetic signals comprises a first electronically reconfigurable electro-optical material (1402) positioned to receive a beam of electromagnetic radiation including one or more electromagnetic signals encoding data. The beam is transmitted through the electro-optical material (1402) and a two-dimensional speckled pattern (1410) is introduced into the cross-section of the beam such that data encoded in the one or more electromagnetic signals is scrambled.
    Type: Grant
    Filed: April 30, 2009
    Date of Patent: October 2, 2012
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventor: Alexandre M. Bratkovski
  • Patent number: 8218226
    Abstract: An optical modulator that utilizes Bloch surface plasmon (BSP) effects is disclosed. The BSP optical (BSPO) modulator (10) includes a permittivity-modulated (P-M) grating (20) that can be one-dimensional or two-dimensional. Electro-optic (EO) substrates (30) sandwich the P-M grating. The EO substrates have electrodes (64) arranged thereon, and a voltage source (60) connected to the electrodes is used to provide an applied voltage (V30) via a modulation voltage signals (SM) that switches the modulator. Index-matching layers (40) may be used to mitigate adverse reflection effects. The BSPO modulator allows for normally incident input light (100I) to be modulated directly without having to generate oblique angles of incidence for the input light in order to excite the surface plasmon.
    Type: Grant
    Filed: July 28, 2009
    Date of Patent: July 10, 2012
    Assignee: Corning Incorporated
    Inventors: Andrey Kobyakov, Kevin Bryan Sparks, Aramais Zakharian
  • Patent number: 8208190
    Abstract: An optical imaging system including an imaging lens and a spatial light modulator is provided. The imaging system has an aperture stop position. The spatial light modulator is disposed at the aperture stop position of the imaging system to serve as a pupil of the imaging lens. The spatial light modulator is adapted to modulate the light transmission rate of the spatial light modulator to change an amplitude and a phase of a light intensity of the pupil.
    Type: Grant
    Filed: December 1, 2010
    Date of Patent: June 26, 2012
    Assignee: National Chiao Tung University
    Inventors: Chu-Ming Cheng, Jyh-Long Chern
  • Publication number: 20120154880
    Abstract: Various embodiments of the present invention are directed to external, electronically controllable modulators. In one embodiment, a modulating device (100,400) includes a first electrode (104,404), a second electrode (106,406), and an active region (102,402). The active region is configured so that at least a portion of the active region is disposed between the first electrode and the second electrode. Applying a voltage of an appropriate magnitude and polarity to the electrodes changes the conductivity of the active region which in turn shifts the phase and/or amplitude of electromagnetic radiation transmitted through the active region.
    Type: Application
    Filed: September 10, 2009
    Publication date: June 21, 2012
    Inventors: Wei Wu, Jingjing Li, Shih-Yuan Wang, Alexandre M. Bratkovski, R. Stanley Williams
  • Patent number: 8175465
    Abstract: Examples of apparatus and methods are provided for controlling a bias in an optical modulator. An exemplary apparatus may comprise an optical modulator operable to modulate an optical signal. The optical modulation apparatus may comprise a photodetector disposed to receive at least a portion of the modulated optical signal. The optical modulation apparatus may comprise a bias controller coupled to both the optical modulator and the photodetector. The bias controller may be configured to receive a dither signal and to produce a bias feedback signal for the optical modulator. The bias feedback signal may be based on a ratio between an odd order harmonic signal of the modulated optical signal and an even order harmonic signal of the modulated optical signal.
    Type: Grant
    Filed: November 10, 2009
    Date of Patent: May 8, 2012
    Assignee: Lockheed Martin Corporation
    Inventors: Leah Wang, Anthony C. Kowalczyk
  • Patent number: 8164819
    Abstract: In a radio frequency (RF)-photonic arbitrary waveform generator (AWG), an optical carrier signal is phase-modulated using an arbitrary waveform optical phase generator (AWPOG), which may include, e.g., sequential optical phase modulators. The phase-modulated optical signal is combined with a version of the optical carrier signal to yield an optical waveform, whose amplitude varies with a phase shift introduced by the AWPOG to the optical carrier signal. By manipulating electrical inputs to the AWPOG which control the phase shift, the optical waveform can be arbitrary shaped. The optical waveform may then be converted to an electrical waveform having a radio frequency.
    Type: Grant
    Filed: May 10, 2010
    Date of Patent: April 24, 2012
    Assignee: Alcatel Lucent
    Inventors: Kun-Yii Tu, Ting-Chen Hu, Young-Kai Chen
  • Patent number: 8139282
    Abstract: A display system is based on a linear array phase modulator and a phase edge discriminator optical system.
    Type: Grant
    Filed: March 30, 2011
    Date of Patent: March 20, 2012
    Assignee: Alces Technology, Inc.
    Inventors: David M Bloom, Matthew A Leone