Using Optical Device, (e.g., Fiber Optics, Cathode Ray Tubes) Patents (Class 341/137)
  • Patent number: 10295582
    Abstract: Techniques relate to reading a qubit coupled to a microwave resonator. A microwave signal at a microwave resonator frequency is input to the microwave resonator that couples to the qubit. A microwave readout signal from the microwave resonator is output to a microwave to optical converter. The microwave readout signal includes a qubit state of the qubit. The microwave to optical converter is configured to convert the microwave readout signal to an optical signal. In response to the optical signal being output by the microwave to optical converter, it is determined that the qubit is in a predefined qubit state. In response to no optical signal being output by the microwave to optical converter, it is determined that the qubit is not in the predefined qubit state.
    Type: Grant
    Filed: June 30, 2016
    Date of Patent: May 21, 2019
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Lev S. Bishop, Jay M. Gambetta, Jason S. Orcutt, Hanhee Paik, James R. Rozen
  • Patent number: 10225077
    Abstract: A symmetric data encryption system configured to receive a data stream to be encoded; to relate segments of the data stream with a predetermined distortion-inducing amplitude of light to encrypt the data stream; to transmit the data stream; to decrypt the data stream by compensating for the value induced by the distortion-inducing amplitude of light; wherein the distortion-inducing amplitude of light relates to different wavelengths of light emitted by one or more of a plurality of light sources in a non-uniform manner so the effect of the distortion-inducing amplitude of light is difficult to predict, thereby providing obfuscation and encryption of the data stream.
    Type: Grant
    Filed: January 29, 2018
    Date of Patent: March 5, 2019
    Assignee: OPEN PORTAL ENTERPRISES (OPE)
    Inventors: Joshua Norman Smith, Robert Chad McCollum
  • Patent number: 10223626
    Abstract: The present invention embraces a method to obtain barcoded information off a computer screen under high ambient lighting conditions, including a direct sunlight environment. The method includes a user prompting a computer to present an active window on all or a portion of its screen. The computer generates a communication sequence, comprising information commonly included on a barcode, and displays the communication sequence on the computer screen. After activating the scanner into an alternative or screen mode, the user places the scanner on the active window of the computer screen and the scanner asynchronously receives the communication sequence. The scanner decodes the received communication sequence and obtains encoded information of the computer. The encoded information may include a unique identifier of the computer, such as a MAC address. With the MAC address, the scanner may wirelessly communicate with the computer to exchange other information.
    Type: Grant
    Filed: April 19, 2017
    Date of Patent: March 5, 2019
    Assignee: HAND HELD PRODUCTS, INC.
    Inventors: H. Sprague Ackley, Damien Francou
  • Patent number: 10191478
    Abstract: An integrated and networked system of remote operations is provided that extends remote expert NDT methodology to a variety of manufacturing and in-service processes. The functional elements of the system comprise remote NDT applications, advanced remote NDT, remote administration, remote NDT commercial operations, and remote data analytics, which are all tied together by a remote communications hub. The communications hub has communication links with computer systems of those functional elements.
    Type: Grant
    Filed: June 16, 2015
    Date of Patent: January 29, 2019
    Assignee: The Boeing Company
    Inventors: Gary E. Georgeson, Tyler M. Holmes, Jeffrey R. Kollgaard
  • Patent number: 10139704
    Abstract: A high-speed analog-to-digital converter can produce a digital signal representative of an analog input electrical signal. An optical amplitude modulator can modulate an input optical pulse train using the analog input electrical signal. An optical splitter can split the modulated optical pulse train into a plurality of modulated optical pulse trains. Optical path delays can stagger in time the modulated optical pulse trains to form a plurality of time-staggered modulated optical pulse trains. Demodulators can detect and filter the time-staggered modulated optical pulse trains to form a respective plurality of time-averaged voltages. Analog-to-digital converters can output a respective plurality of digital time series representative of the respective time-averaged voltages. An interleaver can aggregate the plurality of digital time series to form the digital signal, which has a sample rate greater than a repetition rate of the input optical pulse train.
    Type: Grant
    Filed: July 24, 2017
    Date of Patent: November 27, 2018
    Assignee: Raytheon Company
    Inventors: Bishara Shamee, Steven R. Wilkinson, Makan Mohageg
  • Patent number: 10095262
    Abstract: Under one aspect, a method for performing a linear algebra operation includes imposing matrix elements onto a chirped optical carrier; inputting into a multi-mode optic the matrix elements imposed on the chirped optical carrier; outputting by the multi-mode optic a speckle pattern based on the matrix elements imposed on the optical carrier; and performing a linear algebra operation on the matrix elements based on the speckle pattern. The matrix elements can be from matrix A and a vector b, and the multi-mode optic can optically transform each of matrix A and vector b by a speckle transformation S, so as to output a speckle pattern including elements of a matrix SA of dimension p,n and matrix elements of a vector Sb of dimension p. The linear algebra operation can include generating {tilde over (x)}=(SA)†Sb, wherein † indicates a pseudo-inverse operation.
    Type: Grant
    Filed: December 12, 2016
    Date of Patent: October 9, 2018
    Assignee: The Aerospace Corporation
    Inventors: George C. Valley, Thomas Justin Shaw
  • Patent number: 10069619
    Abstract: A method of performing optical serial-to-parallel conversion of an optical signal includes performing phase modulation of the optical pulse stream and outputting a phase-modulated optical signal as a result thereof. The method also includes performing optical switching of the phase-modulated optical signal by optical switches connected to each other in a series relationship on a signal path. The method further includes performing optical switching of a reference optical clock signal by optical switches connected to each other in a series relationship on a reference path.
    Type: Grant
    Filed: March 6, 2013
    Date of Patent: September 4, 2018
    Assignee: ROCKWELL COLLINS, INC.
    Inventors: Raymond Zanoni, Kim S. Jepsen, Mark A. Laliberte, Oliver S. King
  • Patent number: 9948454
    Abstract: A symmetric data encryption system configured to receive a data stream to be encoded; to relate segments of the data stream with a predetermined distortion-inducing amplitude of light to encrypt the datastream; to transmit the datastream; to decrypt the data stream by compensating for the value induced by the distortion-inducing amplitude of light; wherein the distortion-inducing amplitude of light relates to different wavelengths of light emitted by one or more of a plurality of light sources in a non-uniform manner such that the effect of the distortion-inducing amplitude of light is difficult to predict, thereby providing obfuscation and encryption of the datastream.
    Type: Grant
    Filed: January 14, 2016
    Date of Patent: April 17, 2018
    Assignee: OPEN PORTAL ENTERPRISES (OPE)
    Inventors: Joshua Norman Smith, Robert Chad McCollum
  • Patent number: 9933688
    Abstract: An analog-to-digital converter can produce a digital signal representative of an analog input electrical signal. A continuous-wave laser can lock to a multifrequency optical signal and produce a continuous-wave optical signal. An optical amplitude modulator can modulate the continuous-wave optical signal using the analog input electrical signal to produce a first modulated optical signal. An optical splitter can split the first modulated optical signal into a plurality of modulated optical signals. A plurality of detectors can convert the modulated optical signals into respective modulated electrical signals. A plurality of comparators and a decoder arranged in a flash converter topology can receive the modulated electrical signals and output the digital signal using a timing reference derived from the multifrequency optical signal. Using a relatively high-precision multifrequency optical signal, such as produced by a photonic oscillator, can produce a relatively high-precision device.
    Type: Grant
    Filed: July 24, 2017
    Date of Patent: April 3, 2018
    Assignee: Raytheon Company
    Inventors: Bishara Shamee, Steven R. Wilkinson
  • Patent number: 9835931
    Abstract: A voltage-mode integrate-and-dump photonic ADC front-end circuit includes a current integrator for immediately integrating current pulses onto a capacitor voltage, the current pulses converted by photodetectors from optical data pulses corresponding to a received analog input signal. The circuit may include dampeners for reducing voltage ringing and resulting intersymbol interference (ISI) to preserve SNR at high data rates. The integrating capacitor may be discharged by a reset switch based on clock signals generated by a master clock; the reset switch may include a pulse width controller enabling the integrating capacitor to track and hold the integrated voltage, rather than downstream sample-and-hold amplifiers. Quantizers and other signal processors generate digital signal output by sampling and digitizing the integrated voltage output of the current integrator.
    Type: Grant
    Filed: April 7, 2017
    Date of Patent: December 5, 2017
    Assignee: Rockwell Collins, Inc.
    Inventor: Altin E. Pelteku
  • Patent number: 9823191
    Abstract: A disposable micro-prism test chip for surface plasmon resonance measurement comprises a micro-tray and a micro-prism mounted on the micro-tray. The micro-tray and the micro-prism form at least one cell for providing a fluid dielectric medium for measurement. The disposable micro-prism test chip also comprises a thin metal layer coated on the surface of the micro-prism in the formed cell between the fluid dielectric medium and the micro-prism. The micro-tray may have at least one through window for forming the at least one cell. The micro-tray may also have a half-through cavity facing the micro-prism. The disposable micro-prism test chip is disposed after at least one use. The micro-prism may be fabricated by pulling a heated preform, where the preform has the same cross-section as that of the pulled micro-prism.
    Type: Grant
    Filed: April 19, 2014
    Date of Patent: November 21, 2017
    Assignee: Ecolife Technologies, LLC
    Inventors: Benny L. Chan, Suganda Jutamulia
  • Patent number: 9477040
    Abstract: The present invention includes a high-speed, high-saturation power detector (e.g., a photodiode) compatible with a relatively simple monolithic integration process. In particular embodiments, the photodiode includes an intrinsic bulk absorption region, which is grown above a main waveguide core including a number of quantum wells (QWs) that are used as the active region of a phase modulator. The invention also includes methods of fabricating integrated photodiode and waveguide assemblies using a monolithic, simplified process.
    Type: Grant
    Filed: July 16, 2015
    Date of Patent: October 25, 2016
    Assignee: Sandia Corporation
    Inventor: Erik J. Skogen
  • Patent number: 9438263
    Abstract: A controllable opto-electronic time stretcher comprising a first wave guide and a second waveguide coupled to the first waveguide along a coupling portion; wherein at least one of the first and second waveguides in the coupling portion has a controllable refractive index.
    Type: Grant
    Filed: May 1, 2015
    Date of Patent: September 6, 2016
    Assignee: HRL Laboratories, LLC
    Inventors: Willie W. Ng, Mohiuddin Ahmed, Troy Rockwood
  • Patent number: 9386241
    Abstract: The present invention is directed to an apparatus, method and software product for enhancing the dynamic range of a CCD sensor without substantially increasing the noise. Initially, the area of a N×M pixel CCD sensor array is subdivided into two regions, a large region having (M?a) pixels in each column for outputting large-amplitude signals with low noise and a smaller region having a pixels in each column for outputting small-amplitude signals with improved dynamic range. At integration time, the CCD is read out one region's rows at a time into the horizontal shift registers by shifting the pixel charges in either a or M?a vertical shifts. The charges in the horizontal shift registers are then shifted out of the horizontal shift registers in N horizontal shifts. Next, the remaining pixels in the region of the CCD are read out into the horizontal shift registers by shifting the pixel charges in the other of a or M?a vertical shifts.
    Type: Grant
    Filed: July 2, 2003
    Date of Patent: July 5, 2016
    Assignee: Verity Instruments, Inc.
    Inventor: Andrew Weeks Kueny
  • Patent number: 9356704
    Abstract: A photonic processor can include a first input for a phase-modulated optical pulse signal, a second input for an optical reference signal, and a plurality of states. Each stage is configured to receive the phase-modulated optical pulse signal and a phase-delayed version of the optical reference signal. The phase-delayed version is phase-delayed in accordance with a phase position of the stage. Each stage is comprised of a reference path, a signal path, a coupler and a balanced photo detector. The coupler receives the phase-modulated optical pulse signal and provides as stage phase-modulated optical pulse signal to the signal path. The signal path is coupled to a first input of the balanced photo detector. The coupler also receives the phase-delayed version and provides a stage optical reference signal to the reference path. The reference path is coupled to a second input of the detector. The detector provides an electronic output signal corresponding to a phase relationship.
    Type: Grant
    Filed: August 9, 2013
    Date of Patent: May 31, 2016
    Assignee: Rockwell Collins, Inc.
    Inventors: Raymond Zanoni, Oliver S. King, Wenlu Chen, Kim S. Jepsen, Thomas J. Cullen
  • Patent number: 9350374
    Abstract: A time-interleaved analog-to-digital converter for conversion of L analog input signals to L corresponding digital output signals comprises an array of N (N>L) constituent analog-to-digital converters each having an analog input and a digital output and each adapted to digitize an analog input sample, and a controller adapted to (for each of the L analog input signals indexed by i=1, 2, . . . , L) select a number Ni, of constituent analog-to-digital converters from the array of N constituent analog-to-digital converters (wherein Ni?1 and ?i=1L Ni?N), and cause each sample of the analog input signal to be digitized in a respective one of the selected Ni, constituent analog-to-digital converters. The analog-to-digital converter also comprises a multiplexer adapted to (for each of the L analog input signals) multiplex the digitized samples of each of the selected Ni constituent analog-to-digital converters to produce the digital output signal.
    Type: Grant
    Filed: March 7, 2014
    Date of Patent: May 24, 2016
    Assignee: ANACATUM DESIGN AB
    Inventors: Rolf Sundblad, Robert Hägglund, Staffan Holmbring
  • Patent number: 9344125
    Abstract: An interference cancellation system (ICS) may be used with a communication system to prevent or minimize interference from one or more sources. The ICS may receive radio frequency (RF) signals comprised of one or more signals of interest (SOI) and multiple interfering signals. An interference estimation processor (IEP) may be used to estimate the one or more interfering signals. The interfering signals may be estimated using spatial and/or time diversity, which may be combined with statistical methods. The estimated interfering signals may be sent to the ICS, which may use the estimated interference signal to cancel the interference and output the SOI.
    Type: Grant
    Filed: May 21, 2013
    Date of Patent: May 17, 2016
    Assignee: L-3 Communications Corporation
    Inventors: Elias Bonaventure Kpodzo, Robert Holland, Paul Dourbal, Yanhua Deng, Paul Prucnal, Andrew McCandless
  • Patent number: 9228891
    Abstract: An improved light to frequency converter optical sensor and method using electronic bias. Adjustable gain also may be provided. A summing circuit sums electrical current from a photo detector and electrical current from a bias current circuit and provides the summed current to an integrator. A threshold detector comparator circuit has an input coupled to the output of the integrator and an output providing a series of pulses. The series of pulses has a frequency based on the light received by the photo detector and the electrical current from the bias current circuit.
    Type: Grant
    Filed: March 17, 2014
    Date of Patent: January 5, 2016
    Assignee: SPECTRAL SENSORS INC.
    Inventors: Wayne D Jung, Russell W Jung, Alan R Loudermilk
  • Patent number: 9201287
    Abstract: A photonic analog-to-digital converter is provided that includes a tunable light source, an optical sampling clock source, an optical splitter and a plurality of optical signal processing channels. The tunable light source produces an optical signal at a variable wavelength corresponding to analog levels of an electrical input signal. The optical sampling clock source produces an optical sampling clock signal that defines a sequence of sampling periods. The optical splitter is operably coupled to the tunable light source. The optical splitter splits the optical signal produced by the tunable light source for supply to the plurality of optical signal processing channels. Each one of the optical signal processing channels includes a photonic filter and corresponding optoelectronic thyristor comparator that is operably coupled to the optical sampling clock source.
    Type: Grant
    Filed: April 28, 2015
    Date of Patent: December 1, 2015
    Assignees: Opel Solar, Inc., The University of Connecticut
    Inventor: Geoff W. Taylor
  • Patent number: 9197471
    Abstract: A method of and system of processing a phase-modulated optical signal includes performing, by demodulators, demodulation of the phase-modulated optical signal and outputting optical demodulated signals. The processing further includes performing, by pairs of gated photo detectors respectively connected to the I/Q demodulators, photo detection of the demodulated signals. The processing further tracks and holds electronicversions of the demodulated signals with a track and hold amplifier.
    Type: Grant
    Filed: September 10, 2013
    Date of Patent: November 24, 2015
    Assignee: Rockwell Collins, Inc.
    Inventors: Raymond Zanoni, Kim S. Jepsen, Oliver S. King, Mark A. Laliberte
  • Patent number: 9176361
    Abstract: An optical analog to digital converter including a light source, a driver, an array of single photon avalanche diodes, and control circuitry. The light source emits photons. The driver receives an analog input signal and to drive the light source on the basis of the analog input signal. The array of single photon avalanche diodes detects the photons provided by the light source. The control circuitry is coupled to the array of single photon avalanche diodes and activates the array of single photon avalanche diodes for a predetermined time interval such that the array of single photon avalanche diodes detects the photons provided by the light source during the predetermined time interval. The control circuitry further determines the number of single photon avalanche diodes of the array of single photon avalanche diodes which detected a photon during the predetermined time interval.
    Type: Grant
    Filed: January 2, 2015
    Date of Patent: November 3, 2015
    Assignee: SONY CORPORATION
    Inventors: Piergiorgio Sartor, Klaus Zimmermann
  • Patent number: 9118423
    Abstract: A photonic processor can include a first input for an amplitude-modulated optical pulse signal, a second input for an optical reference signal, and a plurality of stages. Each stage is configured to receive the amplitude-modulated optical pulse signal and a version of the optical reference signal. The version is amplitude attenuated in accordance with a position of the stage. Each stage is comprised of a reference path, a signal path, two couplers and a balanced photo detector. The first coupler receives the pulse signal and provides as stage pulse signal to the signal path coupled to a first input of the detector. The second coupler receives the version and provides a stage optical reference signal to the reference path coupled to a second input of the detector. The detector provides an electronic output signal corresponding to an amplitude relationship.
    Type: Grant
    Filed: August 9, 2013
    Date of Patent: August 25, 2015
    Assignee: Rockwell Collins.com
    Inventors: Raymond Zanoni, Kim S. Jepsen, Oliver S. King, Thomas J. Cullen
  • Patent number: 9052534
    Abstract: An optical A/D converter according to the present invention includes an optical splitter that splits an analog input signal light into plurals, a plurality of Mach-Zehnder interferometers to which each of the signal lights split by the optical splitter is input, and plurality of optical/electrical conversion unit that convert each signal lights output from each Mach-Zehnder interferometer into a digital electrical signal, in which each Mach-Zehnder interferometer includes optical intensity-to-phase conversion unit that optically convert intensity of the input signal light into an amount of phase shift and the amount of phase shift differs for each Mach-Zehnder interferometer. Then, it is possible to provide a high speed and low power consuming optical demodulation circuit.
    Type: Grant
    Filed: April 28, 2011
    Date of Patent: June 9, 2015
    Assignee: NEC CORPORATION
    Inventors: Shinya Sudo, Kenji Sato
  • Patent number: 9054777
    Abstract: A method of sampling a radio frequency signal comprises: receiving the radio frequency signal; modulating an optical signal with the radio frequency signal and an oscillator signal to generate a modulated signal; applying a filter to the modulated signal to generate an intermediate frequency signal, the filter having an intermediate pass band and an intermediate roll-off, the intermediate pass band and the intermediate roll-off in combination defining a intermediate frequency band having a first bandwidth; and sampling the intermediate frequency signal at a sampling frequency using a number of optically interleaved analog-to-digital converters. The oscillator signal and the sampling frequency in combination are arranged such that the intermediate frequency band is defined between consecutive multiples of half of the sampling frequency. Corresponding apparatus for sampling a radio frequency signal is also disclosed.
    Type: Grant
    Filed: April 1, 2010
    Date of Patent: June 9, 2015
    Assignee: BAE SYSTEMS PLC
    Inventors: John Michael Wood, Christopher Ralph Pescod
  • Publication number: 20150123713
    Abstract: A digital/analog converter (30) with a first return-to-zero unit (311) which is connected to a first busbar (321), wherein the first busbar (321) is connected in each case to a first output of several differential units (351, 352, 35n). In this context, the first return-to-zero unit (311) provides at least one clock input which is directly or indirectly connected to a first photodiode, wherein the first photodiode is fed from a pulsed light source (5).
    Type: Application
    Filed: April 24, 2013
    Publication date: May 7, 2015
    Inventor: Gerhard Kahmen
  • Patent number: 8963751
    Abstract: A photonically assisted analog to digital conversion (ADC) system is presented. The system comprises: an optical sampling signal generator configured and operable for generating an optical sampling signal comprising a predetermined sampling pulse sequence in the form of a time separated pulse train of spectral components dispersed in a periodic fashion, where each pulse is distinguishable by a central wavelength thereof different from its neighboring pulses. The generation of the pulse sampling sequence is achieved by combining broadband dispersion and compensation with a periodic dispersion compensator having a free spectral range smaller than the broad bandwidth of the ultrashort pulse. The second innovative element is the introduction of coherent detection with oversampling of the interference terms of the phase modulated pulse sampling sequence and a reference pulse.
    Type: Grant
    Filed: November 29, 2011
    Date of Patent: February 24, 2015
    Assignee: Yissum Research Development Company of the Hebrew University of Jerusalem Ltd
    Inventor: Dan Mark Marom
  • Patent number: 8965211
    Abstract: A system and method of digitizing an analog signal without an amplitude channel is disclosed. The system and method includes receiving an analog signal comprising a voltage v(t) and a frequency f1, producing a series of optical pulses at a sampling frequency f2 with a pulsed laser, splitting the series of optical pulses into a first optical signal and an optical reference signal, phase modulating the first optical signal with the analog signal to produce a sampled optical signal such that phase shifts between adjacent samples in the sampled optical signal does not exceed ? radians, and receiving the sampled optical signal and the optical reference signal at a photonic signal processor.
    Type: Grant
    Filed: September 29, 2011
    Date of Patent: February 24, 2015
    Assignee: Rockwell Collins, Inc.
    Inventors: Raymond Zanoni, Kim S. Jepsen, Oliver S. King, Mark A. Laliberte
  • Patent number: 8941519
    Abstract: A light intensity subtractor according to one aspect of the present invention includes a light subtraction unit, a feedback circuit, a light input port, a first light output port, and a second light output port. The light subtraction unit receives input light through the light input port, outputs first output light to the first light output port, and outputs second output light to the second light output port. The light subtraction unit generates the first output light by reducing the light intensity of the second output light from the light intensity of the input light in accordance with a control voltage. The feedback circuit is connected to the light subtraction unit through the second light output port, and outputs the control voltage in accordance with the light intensity of the received second output light.
    Type: Grant
    Filed: November 18, 2011
    Date of Patent: January 27, 2015
    Assignee: NEC Corporation
    Inventor: Kenji Sato
  • Patent number: 8934058
    Abstract: A signal digitizing system and method based on analog-to-time optical mapping, optically maps amplitude information of an analog signal of interest first into wavelength information using an amplitude tunable filter (ATF) to impress spectral changes induced by the amplitude of the analog signal onto a carrier signal, i.e. a train of optical pulses, and next from wavelength information to temporal information using a dispersive element so that temporal information representing the amplitude information is encoded in the time domain in the carrier signal. Optical-to-electrical conversion of the optical pulses into voltage waveforms and subsequently digitizing the voltage waveforms into a digital image enables the temporal information to be resolved and quantized in the time domain. The digital image may them be digital signal processed to digitally reconstruct the analog signal based on the temporal information with high fidelity.
    Type: Grant
    Filed: November 27, 2013
    Date of Patent: January 13, 2015
    Assignee: Lawrence Livermore National Security, LLC
    Inventors: Jason Chou, Corey V. Bennett, Vince Hernandez
  • Patent number: 8928510
    Abstract: A method can be for use in a photonic analog to digital converter, a first optical signal and a radio frequency signal. The method modulates the first optical signal based on the radio frequency signal, quantizes one or more of phase, quadrature, and amplitude coordinates of the modulated signal, and provides the quantized coordinates to one or more electronic analog to digital converters.
    Type: Grant
    Filed: August 7, 2012
    Date of Patent: January 6, 2015
    Assignee: Rockwell Collins, Inc.
    Inventors: Raymond Zanoni, Alistair J. Price, Peter J. Morgan, Phillip R. Koenig
  • Patent number: 8922410
    Abstract: An optical intensity-to-phase converter according to the present invention includes first and second waveguides to which a first input light is input, a third waveguide to which a second input light is input, and an interaction region that is provided in common on the second and third waveguides in which the first and second input lights are multiplexed and interact. The optical intensity-to-phase converter provides delay to output lights output from the first and second waveguides based on intensity of the first or second input light. Then, it is possible to provide an optical intensity-to-phase converter that enables simple configuration of an optical A/D converter.
    Type: Grant
    Filed: April 28, 2011
    Date of Patent: December 30, 2014
    Assignee: NEC Corporation
    Inventors: Shinya Sudo, Kenji Sato
  • Patent number: 8917197
    Abstract: An interferometer used for modulating an optical signal with an electrical signal is described, where the optical signal can be subsequently detected so as to sample and digitize the electrical signal. Nonlinear optical elements can be located inside the interferometer to reduce the minimum detectable electrical input signal size. The interferometer can contain more than two arms to improve the tolerable dynamic range of the electrical signal. In some cases some outputs of the interferometer are dependent on the electrical input frequency while others have minimal frequency dependence, thereby allowing the frequency of the input electrical signal to be measured more easily. Ideally the modulator operates in a push-pull mode with a single electrode for the input electrical signal. Such a modulator can be constructed by using appropriate optical delay elements.
    Type: Grant
    Filed: January 3, 2013
    Date of Patent: December 23, 2014
    Assignee: Nucript LLC
    Inventor: Gregory S. Kanter
  • Patent number: 8912935
    Abstract: A digital input includes a galvanically isolated section having an integrating capacitor coupled to a high voltage signal input by at least one current-limiting resistor, a relaxation oscillator coupled across the integrating capacitor, and an electronic switch controlled by the relaxation oscillator. An optical isolator has an input side and an output side, wherein the input side is coupled across the integrating capacitor by the switch, and a low voltage section includes a decoder having an input coupled to the output side of the optical isolator and having a low voltage signal output.
    Type: Grant
    Filed: December 26, 2013
    Date of Patent: December 16, 2014
    Assignee: Maxim Integrated Products, Inc.
    Inventor: Douglas S. Smith
  • Patent number: 8902095
    Abstract: An apparatus and method are disclosed to digitize an input electrical signal. A sequence of nonuniformly spaced optical pulses impinges an optical modulator, where the pulses are modulated by the electrical input signal, the optical pulses being detected by one or more photoreceivers, the photoreceiver outputs being electrically sampled in analog-to-digital converters and then processed in a digital signal processor (DSP) in order to measure the electrical input signal. The series of nonuniform pulses are formed by interleaving L uniformly spaced pulse streams each of repetition period T and where fmax, the maximum allowable spectral frequency of the input electrical signal, is greater than 4·L·f/2, where f=1/T.
    Type: Grant
    Filed: September 11, 2012
    Date of Patent: December 2, 2014
    Assignee: Nucript LLC
    Inventors: Gregory S. Kanter, Daniel Reilly, Shawn X. Wang
  • Patent number: 8902096
    Abstract: Systems and methods for converting wideband signals into the digital domain are provided herein. The system may include an electronic or guided-wave optic based replicator configured to obtain at least M replicas of a signal applied thereto, and an electronic or guided-wave optic based segmenter configured to segment a signal applied thereto into at least N segments based on time or wavelength. Together, the replicator and the segmenter obtain M×N segment replicas of the received signal. An electronic or guided-wave optic based mixer is configured to multiply the M×N segment replicas by a mixing matrix having dimension M×N and then to form M integrations each of N segment replicas so as to obtain a measurement vector of length M. A signal recovery processor is configured to obtain a digital representation of the received signal based on the measurement vector and the mixing matrix.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: December 2, 2014
    Assignee: The Aerospace Corporation
    Inventors: George C. Valley, George Sefler, Thomas Justin Shaw
  • Patent number: 8872681
    Abstract: An optical intensity-to-phase converter according to the present invention includes first and second waveguides to which a first input light is input, a third waveguide to which a second input light is input, and an interaction region that is provided in common on the second and third waveguides in which the first and second input lights are multiplexed and interact. The optical intensity-to-phase converter provides delay to output lights output from the first and second waveguides based on intensity of the first or second input light. Then, it is possible to provide an optical intensity-to-phase converter that enables simple configuration of an optical A/D converter.
    Type: Grant
    Filed: April 28, 2011
    Date of Patent: October 28, 2014
    Assignee: NEC Corporation
    Inventors: Shinya Sudo, Kenji Sato
  • Patent number: 8860598
    Abstract: A converter system, including a first converter that digitizes the a first portion of an input signal, the first converter including a comparator, a timer having a circuit structure that emulates a circuit structure of a comparator in the first converter, the timer receiving an input signal indicating commencement of operations in the comparator, a second converter that digitizes a second portion of the input signal remaining from the first portion in response to an output from the timer, and a combiner having inputs to generate a digital code from the digitized first and second portions.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: October 14, 2014
    Assignee: Analog Devices Technology
    Inventors: Frederick Carnegie Thompson, John Cullinane
  • Patent number: 8842028
    Abstract: The present invention relates to Digital-to-Analog conversion in the optical or photonic domain. The present invention provides a digital-to-analog converter (DAC) (100) arranged to receive an N-bit digital optical signal (105) and to process the N-bit digital optical signal to generate an analog optical signal (110). The DAC comprises a photonic circuit (120a, 120b) arranged to adjust the amplitude of each bit of the N-bit digital optical signal dependent on the amplitudes of at least one of the other bits of the N-bit digital optical signal. The amplitudes are adjusted using a non-linear optical effect in order to generate respective outputs for each bit. The DAC also comprises a photonic combiner (145) arranged to combine the outputs for each bit to generate the analog output signal (110).
    Type: Grant
    Filed: February 16, 2009
    Date of Patent: September 23, 2014
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Claudio Porzi, Antonella Bogoni, Luca Poti
  • Publication number: 20140266826
    Abstract: Systems and methods for converting wideband signals into the digital domain are provided herein. The system may include an electronic or guided-wave optic based replicator configured to obtain at least M replicas of a signal applied thereto, and an electronic or guided-wave optic based segmenter configured to segment a signal applied thereto into at least N segments based on time or wavelength. Together, the replicator and the segmenter obtain M×N segment replicas of the received signal. An electronic or guided-wave optic based mixer is configured to multiply the M×N segment replicas by a mixing matrix having dimension M×N and then to form M integrations each of N segment replicas so as to obtain a measurement vector of length M. A signal recovery processor is configured to obtain a digital representation of the received signal based on the measurement vector and the mixing matrix.
    Type: Application
    Filed: March 14, 2013
    Publication date: September 18, 2014
    Applicant: The Aerospace Corporation
    Inventors: George C. VALLEY, George SEFLER, Thomas Justin SHAW
  • Publication number: 20140252202
    Abstract: A system and method is disclosed for an imaging device and/or an analog to digital converter which converts an analog input signal to a digital data signal using a comparator which compares the analog input signal to a first ramped reference signal to determine an operating point and then uses the same comparator to compare the analog input signal to a second ramped reference signal multiple times about the determined operating point.
    Type: Application
    Filed: March 11, 2013
    Publication date: September 11, 2014
    Applicant: TAIWAN SEMICONDUCTOR MANUFACTURING CO., LTD.
    Inventors: Kuo-Yu Chou, Shang-Fu Yeh, Erik Tao, Calvin Yi-Ping Chao
  • Patent number: 8797198
    Abstract: A modulator device for converting digital data into modulation of an optical signal includes an electronic input for receiving an input data word of N bits and an electrically controllable modulator for modulating the intensity of an optical signal, the modulator including M actuating electrodes where M?N. An electrode actuating device, most preferably a digital-to-digital converter, operates actuating electrodes so that at least one electrode is actuated as a function of values of more than one bit of the input data word. According to an alternative, or supplementary, aspect of the invention, the set of electrodes includes at least one electrode having an effective area which is not interrelated to others of the set by factors of two. In one preferred implementation, a Mach-Zehnder modulator also provides phase modulation to give QAM functionality. Another implementation employs a semiconductor laser.
    Type: Grant
    Filed: October 25, 2011
    Date of Patent: August 5, 2014
    Assignee: Ramot at Tel-Aviv University Ltd.
    Inventors: Yossef Ehrlichman, Ofer Amrani, Shlomo Ruschin
  • Patent number: 8779955
    Abstract: A photonic analog-to-digital signal conversion system can utilize an optical phase modulator configured to receive a first signal and a first optical pulse signal and to provide an optical phase—modulated pulse signal. A photonic processor can be configured to receive the optical phase—modulated pulse signal and the optical pulse signal and to provide an electronic first demodulated signal and an electronic second demodulated signal. A first comparator can be configured to receive the electronic first demodulated signal and provide a first compared signal, and a second comparator can be configured to receive the electronic second demodulated signal and provide a second compared signal. At least one logic circuit can be configured to receive the first compared signal and the second compared signal.
    Type: Grant
    Filed: September 25, 2012
    Date of Patent: July 15, 2014
    Assignee: Rockwell Collins, Inc.
    Inventors: Raymond Zanoni, Kim S. Jepsen, Oliver S. King
  • Patent number: 8725004
    Abstract: Methods and apparatus for optical analog to digital conversion are disclosed. An optical signal is converted by mapping the optical analog signal onto a wavelength modulated optical beam, passing the mapped beam through interferometers to generate analog bit representation signals, and converting the analog bit representation signals into an optical digital signal. A photodiode receives an optical analog signal, a wavelength modulated laser coupled to the photodiode maps the optical analog signal to a wavelength modulated optical beam, interferometers produce an analog bit representation signal from the mapped wavelength modulated optical beam, and sample and threshold circuits corresponding to the interferometers produce a digital bit signal from the analog bit representation signal.
    Type: Grant
    Filed: January 26, 2012
    Date of Patent: May 13, 2014
    Assignee: Sandia Corporation
    Inventor: Gregory A. Vawter
  • Publication number: 20140055437
    Abstract: A display apparatus includes pixels, gate lines and data lines, a gate driver driving the gate lines, a data driver which drives the data lines, and a timing controller which controls the gate and data drivers and provides digital image signals to the data driver. The data driver includes a digital-to-analog converter which receives first and second gamma voltages and converting the digital image signals to analog image signals and an output buffer which outputs the analog image signals to the data lines. The digital-to-analog converter includes a resistor string which receives the first and second gamma voltages and generates gamma voltages, a look-up table which stores selection signals, a first decoder which selects the gamma voltages and outputs the selected gamma voltages as gamma reference voltages, and a second decoder which converts the digital image signals to the analog image signals based on the gamma reference voltages.
    Type: Application
    Filed: January 10, 2013
    Publication date: February 27, 2014
    Applicant: SAMSUNG DISPLAY CO., LTD.
    Inventors: Young-Il BAN, SUNKYU SON, Kyungha KIM
  • Publication number: 20140055583
    Abstract: An endoscope system may include: an insertion section that is inserted into an object under examination, having an image capturing unit that successively outputs a pixel signal of a strength responsive to the amount of light of the pixel, and a time converter that converts the intensity of the pixel signal to time information representing a time interval by a time width and that transmits the converted time information; a transfer section that guides the outside of the object under examination the time information transmitted from the time converter; and an external apparatus positioned outside the object under examination, having a time interval converter that receives the time information guided by the transfer section and converts to a digital signal and outputs the intensity of the pixel signal represented by the received time information and an image processing unit that outputs an image responsive to the pixel signal.
    Type: Application
    Filed: February 15, 2013
    Publication date: February 27, 2014
    Applicant: OLYMPUS CORPORATION
    Inventor: OLYMPUS CORPORATION
  • Patent number: 8655176
    Abstract: A system and methods are provided for converting a first temporally short and spectrally broad optical pulse into a train of spectrally narrow and distinct optical pulses. This involves receiving, on a first I/O channel, the first optical pulse associated with a plurality of wavelengths and performing wavelength division demultiplexing on the first optical pulse at an optical unit housed on an optical chip to output a plurality of second optical pulses on different ones of a plurality of second I/O channels, each of the second optical pulses associated with a unique wavelength range from the first optical pulse. This also involves receiving the second optical pulses at loop mirrors in the second I/O channels, wherein the second I/O channels are patterned as waveguides in the optical chip and reflecting, at the loop mirrors, the second optical pulses back to the optical unit.
    Type: Grant
    Filed: January 27, 2010
    Date of Patent: February 18, 2014
    Assignee: Telcordia Technologies, Inc.
    Inventor: Janet Jackel
  • Publication number: 20140042300
    Abstract: An image sensor and a column analog-to-digital converter thereof are provided. The column analog-to-digital converter includes a counter providing a counter result, a ramp signal generator providing a ramp signal and a start signal, a sampling and comparing array, a first latch array, a second latch array, and an arithmetic unit. The sampling and comparing array outputs a plurality of brightness transformation signals according to the ramp signal, the start signal, and initial voltages and brightness voltages of a plurality of photosensitive pixels. The first and the second latch arrays latch the counter result in response to the brightness transformation signals and output a plurality of first brightness latch values during a first period and a plurality of second brightness latch values during a second period. The arithmetic unit calculates the brightness values of the photosensitive pixels according to the first brightness latch values and the second brightness latch values.
    Type: Application
    Filed: November 23, 2012
    Publication date: February 13, 2014
    Applicant: NOVATEK MICROELECTRONICS CORP.
    Inventor: Jer-Hao Hsu
  • Patent number: 8618966
    Abstract: A method of digitizing an analog electrical signal combines optical and electronic techniques in order to improve the resolution, sampling rate, input frequency range, or flexibility. It implements an optical interferometric modulator, which modulates an input optical signal by the input electrical signal combined with a calibration signal. A set of two or more photoreceivers receiving the output optical signals from the optical modulator produce output electrical signals, which are digitized and processed in a DSP to produce a digitized version of the electrical input signal, and a digitized calibration signal value is used to optimize the input electrical signal digitization. The method and the device can be used in many fields including instrumentation, communications, and imaging.
    Type: Grant
    Filed: February 20, 2012
    Date of Patent: December 31, 2013
    Assignee: Nucript LLC
    Inventors: Gregory S. Kanter, Daniel Reilly
  • Publication number: 20130328706
    Abstract: A photonically assisted analog to digital conversion (ADC) system is presented. The system comprises: an optical sampling signal generator configured and operable for generating an optical sampling signal comprising a predetermined sampling pulse sequence in the form of a time separated pulse train of spectral components dispersed in a periodic fashion, where each pulse is distinguishable by a central wavelength thereof different from its neighboring pulses. The generation of the pulse sampling sequence is achieved by combining broadband dispersion and compensation with a periodic dispersion compensator having a free spectral range smaller than the broad bandwidth of the ultrashort pulse. The second innovative element is the introduction of coherent detection with oversampling of the interference terms of the phase modulated pulse sampling sequence and a reference pulse.
    Type: Application
    Filed: November 29, 2011
    Publication date: December 12, 2013
    Applicant: Yissum Research Development Company of the Hebrew University of Jerusalem Ltd.
    Inventor: Dan Mark Marom
  • Patent number: 8606051
    Abstract: Circuits, methods, and apparatus are described that provide calibration of column-parallel analog-to-digital converters (ADCs) in image processing contexts only once per frame (or less frequently) to reduce column-wise noise. For example, the column ADCs are calibrated during an inter-frame time interval, like a vertical blanking interval. In some embodiments, calibration data for the column ADCs for a calibration period is stored at the digital block for use in processing row data from the column ADCs. In other embodiments, calibration data for the column ADCs for the calibration period is stored at column ADCs in a local memory for local correction of the pixel data prior to being read out to the digital block for processing. In certain embodiments, techniques, such as differential ADC architectures, are used to mitigate row-wise noise in context of the frame-wise calibration.
    Type: Grant
    Filed: August 16, 2010
    Date of Patent: December 10, 2013
    Assignee: SK hynix Inc.
    Inventors: Yibing Michelle Wang, Jeffrey Joseph Rysinski, Sang-Soo Lee