Modulation Patents (Class 372/26)
  • Patent number: 11125689
    Abstract: Building blocks are provided for on-chip chemical sensors and other highly-compact photonic integrated circuits combining interband or quantum cascade lasers and detectors with passive waveguides and other components integrated on a III-V or silicon. A MWIR or LWIR laser source is evanescently coupled into a passive extended or resonant-cavity waveguide that provides evanescent coupling to a sample gas (or liquid) for spectroscopic chemical sensing. In the case of an ICL, the uppermost layer of this passive waveguide has a relatively high index of refraction that enables it to form the core of the waveguide, while the ambient air, consisting of the sample gas, functions as the top cladding layer. A fraction of the propagating light beam is absorbed by the sample gas if it contains a chemical species having a fingerprint absorption feature within the spectral linewidth of the laser emission.
    Type: Grant
    Filed: July 12, 2019
    Date of Patent: September 21, 2021
    Assignee: The Government of the United States of America, as represented by the Secretary of the Navy
    Inventors: Jerry R. Meyer, Igor Vurgaftman, Chadwick Lawrence Canedy, William W. Bewley, Chul Soo Kim, Charles D. Merritt, Michael V. Warren, R. Joseph Weiblen, Mijin Kim
  • Patent number: 11082132
    Abstract: A system can include at least one optical encoder section configured to transform a first optical signal carrying first data into a second optical signal carrying the first data and an additional optical feature not present in the first optical signal; at least one optical modulator configured to optically modulate the second optical signal according to a compare data to generate an optical match signal that indicates matches between the compare data and the first data; and at least one photodetector configured to generate an electrical match signal in response to the optical match signal; wherein the optical match signal has at least first values when the first data matches the compare data, and at least second values when the first data does not match the compare data. Corresponding methods are also disclosed.
    Type: Grant
    Filed: April 7, 2020
    Date of Patent: August 3, 2021
    Inventor: Bradley T Sako
  • Patent number: 11061077
    Abstract: A test and measurement instrument for performing multiple operations, including a port to receive a signal from a device under test; and a processor. The processor configured to, based on a parallel trigger model, execute a first process associated with first functionality of the test and measurement instrument, and execute a second process on the signal from the device under test, the second process associated with second functionality of the test and measurement instrument. The second process commencing prior to completion of the first process.
    Type: Grant
    Filed: December 29, 2017
    Date of Patent: July 13, 2021
    Assignee: Keithley Instruments, LLC
    Inventors: Brian P. Frackelton, George J. Polly
  • Patent number: 11046245
    Abstract: A motor vehicle includes a lighting module that generates a symbol on the ground in the surroundings of the motor vehicle, a surrounding sensor system that detects sensor information in a region in the surroundings of the motor vehicle, and a controller designed to control the lighting module depending on the sensor information such that the symbol is generated automatically by the lighting module in a ground region between the motor vehicle and another road user as soon as the distance between the motor vehicle and the other road user falls below a specified threshold according to the sensor information.
    Type: Grant
    Filed: September 6, 2019
    Date of Patent: June 29, 2021
    Assignee: Bayerische Motoren Werke Aktiengesellschaft
    Inventors: Helmut Erdl, Abdelmalek Hanafi, Thomas Hausmann, Lenja Sorokin
  • Patent number: 11005232
    Abstract: A light source device includes a laser diode configured to emit a laser light used as an illumination light, a determination unit configured to determine one of a plurality of modes as an operation mode of the laser diode based on usage state of the light source device; and a driver configured to drive the laser diode in a condition that a bias current to the laser diode is applied depending on the operation mode determined by the determination unit.
    Type: Grant
    Filed: December 7, 2018
    Date of Patent: May 11, 2021
    Assignee: OLYMPUS CORPORATION
    Inventors: Iwao Komazaki, Masahiro Nishio
  • Patent number: 10971772
    Abstract: A storage module stores electrical energy. The storage module has a first storage cell and a second storage cell, each having a positive terminal and a negative terminal. The storage module includes a contact bridge, which connects one terminal of the first storage cell to one terminal of the second storage cell in an electrically conductive manner. The contact bridge is designed to reduce an electrical resistance between the electrically connected terminals of the first storage cell and of the second storage cell with rising temperature.
    Type: Grant
    Filed: December 7, 2018
    Date of Patent: April 6, 2021
    Assignee: Bayerische Motoren Werke Aktiengesellschaft
    Inventors: Marc-Thomas Eisele, Juergen Hildinger, Christian Kulp
  • Patent number: 10962713
    Abstract: An optical waveguide structure including a bottom layer, a middle waveguide layer, and a top cladding layer is provided. The middle waveguide layer is disposed on the bottom layer. The top cladding layer is disposed on the middle waveguide layer and covers the middle waveguide layer. The refractive index of the middle waveguide layer is greater than that of the bottom layer, and is greater than that of the top cladding layer. The optical waveguide structure has a first end region and a second end region. The middle waveguide layer in the first end region has a first end having a width gradually decreased toward the second end region. The top cladding layer in the second end region has a second end having a width gradually decreased away from the first end region.
    Type: Grant
    Filed: December 25, 2019
    Date of Patent: March 30, 2021
    Assignee: Industrial Technology Research Institute
    Inventor: Wen-Chin Lee
  • Patent number: 10955691
    Abstract: Within a modulator driver, different blocks are employed, e.g. a buffer, one or more variable gain amplifiers (VGA), and a final driver stage. Each of these blocks has an optimum bias point for best performance; however, interconnecting the blocks requires sharing the DC bias points in their interface, which does not necessarily match the optimum performance bias point of each block. Accordingly, a first offset feedback loop extending from reference points after a selected one of the blocks to an input of one of the blocks. The first offset feedback loop includes current sources capable of delivering a variable current to the input of the selected block in order to compensate any offset in an amplified differential input electrical signal measured at the reference points. A first bias feedback loop is also provided, including a current sinker for subtracting excess current introduced in the first offset compensation feedback loop.
    Type: Grant
    Filed: June 13, 2019
    Date of Patent: March 23, 2021
    Assignee: Elenion Technologies, LLC
    Inventors: Ariel Leonardo Vera Villarroel, Abdelrahman Ahmed, Daihyun Lim, Alexander Rylyakov
  • Patent number: 10824532
    Abstract: A method includes recording, in a first database table, user interactions of one or more users with a user interface, retrieving a list of runtime errors that have occurred in a system resulting from the user interactions, for each runtime error in the list, identifying a type of the runtime error comprising one of a first type and a second type, and retrieving a corresponding call stack comprising a sequence of function calls that led to the runtime error, storing information from the call stack in a second database table, correlating the user interactions recorded in the recording step with the function calls in the call stack, and providing, on a display device, a visual reproduction of processing steps leading up to the runtime error using the correlations in the correlating step.
    Type: Grant
    Filed: October 16, 2018
    Date of Patent: November 3, 2020
    Assignee: SAP SE
    Inventors: Reivin Richards Raj, Aparna Vohra
  • Patent number: 10826265
    Abstract: A frequency stabilizer includes: a delay line interferometer that receives an optical signal corresponding to one frequency mode of a pulsed laser, divides and transmits the received optical signal to a reference arm and a delay arm including an optical fiber delay line, and then outputs an interference signal between signals passing through the reference arm and the delay arm; a photoelectric converter that converts the interference signal into an electrical signal; a mixer that generates a baseband signal of the electrical signal by mixing a carrier frequency signal; and a feedback controller that transmits a control signal generated based on the baseband signal to the pulsed laser. The optical signal passing through the delay arm is weighted with a delay time caused by the optical fiber delay line compared to the optical signal passing through the reference arm, and the optical signal passing through the delay arm is frequency shifted to a carrier frequency of an oscillator.
    Type: Grant
    Filed: September 17, 2019
    Date of Patent: November 3, 2020
    Assignee: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Jungwon Kim, Dohyeon Kwon
  • Patent number: 10811840
    Abstract: A laser module that can suppress influence due to a reflected light between chips is provided. A laser module 100 according to one embodiment of the present invention includes: a laser element 110 provided on a first substrate and having a laser oscillation unit that generates a laser light and a first optical waveguide that guides the laser light; and an optical amplifier 120 provided on a second substrate and having a second waveguide that guides the laser light. The first optical waveguide is nonparallel relative to an end face of the first substrate and connected thereto, the second optical waveguide is nonparallel relative to an end face of the second substrate and connected thereto, and the first substrate and the second substrate are arranged such that the laser light output from the first optical waveguide is optically coupled to the second optical waveguide.
    Type: Grant
    Filed: August 3, 2018
    Date of Patent: October 20, 2020
    Assignee: FURUKAWA ELECTRIC CO., LTD.
    Inventors: Maiko Ariga, Yusuke Inaba, Kazuaki Kiyota, Toshihito Suzuki
  • Patent number: 10771161
    Abstract: Provided is an optical transmission module which can generate PAM4 optical modulation signals without converting a plurality of binary electric signals to a multi-level electric signal. An optical transmission module (200) comprising: a light source (60) for emitting continuous waveform (CW) light; optical modulators (51,52,53) arranged in series with a path of the CW light configured to modulate the CW light by switching relatively large absorption and relatively small absorption of the optical modulators in response to a modulation signal applied to the respective optical modulators; and an arithmetic logic circuit (100) configured to receive a plurality of binary electrical signals, and then to perform logic operation on the plurality of binary electrical signals for generating a new plurality of binary electrical signals, wherein each of the new plurality of binary electrical signals is applied to the respective optical modulators as the modulation signal.
    Type: Grant
    Filed: December 7, 2017
    Date of Patent: September 8, 2020
    Assignee: Lumentum Japan, Inc.
    Inventors: Atsushi Nakamura, Shunya Yamauchi, Yoriyoshi Yamaguchi, Nozomu Yasuhara, Yoshihiro Nakai, Hideaki Asakura, Noriko Sasada, Takayoshi Fukui, Hiroki Irie
  • Patent number: 10694597
    Abstract: A pixel circuit for illuminating an LED unit with a level of brightness is provided, which includes a latch circuit, a pass switch, a PWM circuit, and a current source. The latch circuit latches control data according to a latch signal to generate a control signal. The pass switch provides the control data from a data signal to the latch circuit according to a scan signal. The PWM circuit generates a PWM signal according to the control signal and an enable signal. The current source supplies a constant current flowing through the LED unit according to the PWM signal.
    Type: Grant
    Filed: September 28, 2018
    Date of Patent: June 23, 2020
    Assignee: INNOLUX CORPORATION
    Inventor: Hirofumi Watsuda
  • Patent number: 10663774
    Abstract: An embodiment includes an optical transmission module, an optical transceiver, and an optical communication system including the same, the optical transmission module comprising: a light emitting diode; and an optical modulator for modulating first light emitted from the light emitting diode, wherein the light emitting diode and the optical modulator include GaN, and the optical modulator transmits the first light therethrough when a voltage is applied.
    Type: Grant
    Filed: October 3, 2019
    Date of Patent: May 26, 2020
    Assignee: Industry-University Cooperation Foundation Hanyang University Erica Campus
    Inventors: Jong In Shim, Dong Soo Shin, Won Jin Choi
  • Patent number: 10613513
    Abstract: A system includes a computing device that generates at least one process script for the modification to a material substrate and at least one pattern script that corresponds to the process script. The computing device also merges the process script with the pattern script and generates a plurality of command signals that are based on the merged process and pattern scripts. An energy source generates a plurality of light beams based on the generated command signal(s). At least one modulating component modulates the generated light beams based on generated command signal(s). A waveform apparatus generates at least one waveform signal to customize the generated light beams based on the generated command signal(s). A motion control apparatus controls at least one parameter of the light beams based on the generated command signal(s).
    Type: Grant
    Filed: March 24, 2017
    Date of Patent: April 7, 2020
    Assignee: The Aerospace Corporation
    Inventor: Frank Edward Livingston
  • Patent number: 10581527
    Abstract: A system, method, and device for RF upconversion. The system can include a laser, two EAMs, a photonic filter, a photonic service filter, two photodiodes, and a mixer. The first EAM can convert a received RF signal into the photonic domain by modulating an optical signal (received from the laser) based on the received RF signal to output a modulated optical signal. The photonic filter can output a filtered optical signal based on the modulated optical signal to the first photodiode which can output a filtered RF signal in the RF domain. The second EAM can output an LO modulated optical signal based on a received LO to the service filter which can output a filtered LO optical signal to the second photodiode which can output a filtered LO signal in the RF domain. The mixer can mix the filtered RF and LO signals to generate an IF signal.
    Type: Grant
    Filed: November 27, 2017
    Date of Patent: March 3, 2020
    Assignee: LOCKHEED MARTIN CORPORATION
    Inventors: Andrew F. Schaefer, Paul T. Coyne, John C. Ceccherelli
  • Patent number: 10581220
    Abstract: A light emitting module includes a light emitting device including first to sixth electrodes and a holder including first to sixth terminals. An insulator body of the holder at least partially surrounds the light emitting device in a plan view with the light emitting device being interposed between a first inner edge and a second inner edge of the insulator body, and a third inner edge linking the first and second inner edges. The first terminal projects from a third inner edge and is connected to the first electrode. The second and third terminals project from the first inner edge and are connected to the second and third electrodes, respectively. The fourth terminal projects from the third inner edge and connected to the fourth electrode. The fifth and sixth terminals project from the second inner edge and are connected to the fifth and sixth electrodes, respectively.
    Type: Grant
    Filed: February 26, 2019
    Date of Patent: March 3, 2020
    Assignee: NICHIA CORPORATION
    Inventors: Tomohiko Hatano, Daisuke Sato
  • Patent number: 10574382
    Abstract: An embodiment method includes multiplexing light emitted by the plurality of optical transmitters to provide a multiplexed optical signal; propagating the multiplexed optical signal through an optical interleaver from a first port thereof to a combined port thereof and back to a second port thereof; and detecting an optical signal at the second port of the optical interleaver.
    Type: Grant
    Filed: June 1, 2018
    Date of Patent: February 25, 2020
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Zhiping Jiang, Xuefeng Tang, Zhuhong Zhang
  • Patent number: 10574033
    Abstract: In the arrayed semiconductor optical device, a plurality of semiconductor optical devices including a first semiconductor optical device and a second semiconductor optical device are monolithically integrated on a semiconductor substrate, each of the semiconductor optical devices includes a first semiconductor layer having a multiple quantum well layer and a grating layer disposed on an upper side of the first semiconductor layer, a layer thickness of the first semiconductor layer of the first semiconductor optical device is thinner than a layer thickness of the first semiconductor layer of the second semiconductor optical device, and a height of the grating layer of the first semiconductor optical device is lower than a height of the grating layer of the second semiconductor optical device corresponding to difference in the layer thickness of the first semiconductor layer.
    Type: Grant
    Filed: July 24, 2019
    Date of Patent: February 25, 2020
    Assignee: Lumentum Japan, Inc.
    Inventors: Takeshi Kitatani, Koichiro Adachi
  • Patent number: 10558064
    Abstract: An optical communication module includes: an optical modulator that includes an optical modulation element housed in a rectangular parallelepiped container; a driver circuit that inputs a high-frequency signal to the optical modulation element; and a housing that houses the optical modulator and the driver circuit. An electrical interface is provided on one lateral surface of the housing, and an optical interface is provided on another lateral surface, which is opposite to the lateral surface, of the housing. In the optical modulator, an end of a wiring substrate, which is configured to introduce the high-frequency signal to the optical modulation element, is led out from one short-side side of the rectangular parallelepiped container, and the driver circuit is disposed between the short-side side of the optical modulator and the electrical interface.
    Type: Grant
    Filed: March 30, 2018
    Date of Patent: February 11, 2020
    Inventors: Norikazu Miyazaki, Kei Katou
  • Patent number: 10541510
    Abstract: The first transmission line has a width perpendicular to a transmission direction. The first electrode has a width not exceeding the width. The first electrode is opposed to the first transmission line. The ground layer has a positional relationship with each portion of the first transmission line. The ground layer is next to the first transmission line on at least one side consisting of a first side along a thickness direction of the mounting substrate, and a second side and a third side with the first transmission line interposed therebetween. The first transmission line is bonded to the first electrode and has the width equivalently, at least, at a portion of the first transmission line. The portion equivalently has the positional relationship with the ground layer. The portion is next to the ground layer in an equivalent shape along the transmission direction.
    Type: Grant
    Filed: July 27, 2018
    Date of Patent: January 21, 2020
    Assignee: Lumentum Japan, Inc.
    Inventor: Koichiro Adachi
  • Patent number: 10530123
    Abstract: A drive circuit is configured to supply a current to a light emitting element. The drive circuit includes a plurality of switching elements configured to switch between ON/OFF states with a modulation signal, a capacitor connected in parallel with the light emitting element, and a control module configured to control the switching elements so that a voltage of the capacitor does not become lower than a threshold.
    Type: Grant
    Filed: March 12, 2018
    Date of Patent: January 7, 2020
    Assignee: RICOH COMPANY, LTD.
    Inventors: Yuuki Oka, Tsuyoshi Ueno, Seiya Abe
  • Patent number: 10530124
    Abstract: Examples of the present disclosure include a tunable laser comprising an optical coupler to couple light between a first laser cavity and a second laser cavity. The first laser cavity may extending between the optical coupler and a first reflector and include a first gain section. The second laser cavity may extend between the optical coupler and a second reflector and including a second gain section. At least one of the first laser cavity and the second laser cavity is tunable.
    Type: Grant
    Filed: May 11, 2017
    Date of Patent: January 7, 2020
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Stanley Cheung, Michael Renne Ty Tan, Wayne V Sorin, Joaquin Matres Abril, Sagi Mathai
  • Patent number: 10514540
    Abstract: The disclosure provides a light source device and an image display device. The light source device includes a laser light source configured to emit laser light having a wavelength in a range from 635 nm to 645 nm inclusive, a temperature sensor configured to detect temperature around the light source device, and a laser control circuit configured to control the laser light source. The laser control circuit approximates, with use of a quartic expression, change in threshold current of the laser light source relative to temperature, and approximates, with use of a quadratic expression, change in slope efficiency of the laser light source relative to temperature, to obtain threshold current and slope efficiency of the laser light source corresponding to detection temperature of the temperature sensor, and controls the laser light source in accordance with the threshold current and the slope efficiency thus obtained.
    Type: Grant
    Filed: June 21, 2018
    Date of Patent: December 24, 2019
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Akira Kurozuka, Yuta Yamamoto, Susumu Uragami, Hiroyuki Furuya
  • Patent number: 10490967
    Abstract: The invention relates to bi-directional long-cavity semiconductor lasers for high power applications having two AR coated facets (2AR) to provide an un-folded cavity with enhanced output power. The lasers exhibit more uniform photon and carrier density distributions along the cavity than conventional uni-directional high-power lasers, enabling longer lasers with greater output power and lasing efficiency due to reduced longitudinal hole burning. Optical sources are further provided wherein radiation from both facets of several 2AR lasers that are disposed at vertically offset levels is combined into a single composite beam.
    Type: Grant
    Filed: September 30, 2016
    Date of Patent: November 26, 2019
    Assignee: Lumentum Operations LLC
    Inventors: Abdullah Demir, Matthew Glenn Peters
  • Patent number: 10483713
    Abstract: A laser apparatus may include: a quantum cascade laser outputting, based on a supplied current, laser light at an oscillation start timing when a first delay time elapses from a current rising timing of the supplied current: an amplifier disposed in a laser light optical path, and selectively amplifying light of a predetermined wavelength to output the amplified laser light to a chamber including a plasma generation region into which a target is fed; and a laser controller controlling a third delay time, from an output timing of a laser output instruction to the current rising timing, to cause a laser light wavelength to be equal to the predetermined wavelength at an aimed timing when a second delay time elapses from the oscillation start timing, based on oscillation parameters including the first delay time, a supplied current waveform, and a device temperature of the quantum cascade laser.
    Type: Grant
    Filed: September 7, 2017
    Date of Patent: November 19, 2019
    Assignee: Gigaphoton Inc.
    Inventors: Seiji Nogiwa, Yasufumi Kawasuji
  • Patent number: 10461639
    Abstract: Current in a switching converter is controlled using a current-mode hysteretic controller. The high-side switch (usually a PMOS) is turned off when the current in the coil exceeds a certain peak control current. The low-side switch (usually an NMOS) is turned off when the current in the coil falls below a certain valley control current. A current ramp is added to one of these control currents, either peak or valley. The current ramp is initiated by a reference clock signal, which has the effect of synchronizing the switching converter to the reference clock.
    Type: Grant
    Filed: August 23, 2018
    Date of Patent: October 29, 2019
    Assignee: Dialog Semiconductor (UK) Limited
    Inventor: Mark Childs
  • Patent number: 10451905
    Abstract: An embodiment includes an optical transmission module, an optical transceiver, and an optical communication system including the same, the optical transmission module comprising: a light emitting diode; and an optical modulator for modulating first light emitted from the light emitting diode, wherein the light emitting diode and the optical modulator include GaN, and the optical modulator transmits the first light therethrough when a voltage is applied.
    Type: Grant
    Filed: July 8, 2016
    Date of Patent: October 22, 2019
    Assignee: Industry-University Cooperation Foundation Hanyang University Erica Campus
    Inventors: Jong In Shim, Dong Soo Shin, Won Jin Choi
  • Patent number: 10429726
    Abstract: An image display apparatus according to an embodiment of the present technology includes a first light source module, a second light source module, an output control unit, and an image generation unit. The first light source module emits a first laser light. The second light source module includes a light source unit that emits a second laser light and a phosphor layer that emits visible light by excitation by the second laser light. The output control unit controls outputs of the first laser light and the second laser light on a basis of an average and a dispersion of luminance values in pixels of an input image. The image generation unit generates an image on a basis of the first laser light emitted from the first light source module and the visible light emitted from the second light source module.
    Type: Grant
    Filed: June 20, 2016
    Date of Patent: October 1, 2019
    Assignee: SONY CORPORATION
    Inventors: Chiharu Suzuki, Yukihiro Sasazaki, Naoya Matsuda
  • Patent number: 10418779
    Abstract: A laser driving control apparatus includes: a driver that constant-voltage drives a laser light source that radiates laser light by supplying a pulse signal in which a plurality of pulses, each pulse width thereof being changeable, is generated at a predetermined cycle; and a controller that performs control to change the pulse width of each of the plurality of pulses so that a first change amount of the pulse width when a present-time pulse width is changed to a preceding pulse width prior to reaching a pulse width at which a target light quantity is obtained stably is larger than a second change amount of the pulse width when the present-time pulse width is changed to a target pulse width corresponding to a driving current at an ON time of the laser light source in a steady state in which the target light quantity is obtained stably.
    Type: Grant
    Filed: April 27, 2018
    Date of Patent: September 17, 2019
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Chikaho Ikeda, Shigeyuki Sakaki, Akira Sakamoto
  • Patent number: 10394058
    Abstract: Optical modulators and modulation techniques for advanced optical modulation formats are described. An optical modulator may include two optical modulators in parallel optical paths, and optical powers in the two paths may be unequal. Polarization in the two paths may be orthogonal, and modulated outputs from each path may be combined to produce multilevel modulation formats.
    Type: Grant
    Filed: September 17, 2018
    Date of Patent: August 27, 2019
    Assignee: Acacia Communications, Inc.
    Inventors: Diedrik Vermeulen, Christopher Doerr
  • Patent number: 10386581
    Abstract: A grating based optical transmitter includes a light source region coupled to an interference region, two reflective regions on both sides of the interference region, and one or several gratings interacting with the interference light wave in the interference region causing a vertical emission. Two electrodes are used to inject electrical carriers, and a third electrode can be added to modulate the electrical carrier density recombined in the light source region. Compared to conventional edge-emitting laser with two electrodes, the grating-based optical transmitter in this invention largely reduces the packaging cost and complexity due to the vertical emission, and largely enhances the modulation bandwidth due to the three-terminal configuration.
    Type: Grant
    Filed: July 5, 2016
    Date of Patent: August 20, 2019
    Inventors: Shu-Lu Chen, Yun-Chung Na
  • Patent number: 10381395
    Abstract: A light control device according to the present disclosure includes: stacked M (provided that M?1) light control layers 113M in each of which a first nanocarbon film 114, a first intermediate layer 117A, a dielectric material layer 116, and a second intermediate layer 117B are stacked; and a second nanocarbon film 115formed on the second intermediate layer 117B included in an M-th light control layer 113M. A voltage is applied to the first nanocarbon film 114 and the second nanocarbon film 115.
    Type: Grant
    Filed: November 12, 2014
    Date of Patent: August 13, 2019
    Assignee: SONY SEMICONDUCTOR SOLUTIONS CORPORATION
    Inventors: Kyoko Izuha, Tomoo Mitsunaga, Kouichi Harada, Koji Kadono
  • Patent number: 10355451
    Abstract: A laser comprising a laser cavity formed by a broadband mirror and a comb mirror having a plurality of reflection peaks. A spacing between the plurality of reflection peaks is adjusted such that only one reflection peak is in a gain bandwidth of the laser.
    Type: Grant
    Filed: April 25, 2018
    Date of Patent: July 16, 2019
    Assignee: FREEDOM PHOTONICS LLC
    Inventors: Gordon Barbour Morrison, Leif Johansson, Milan L. Mashanovitch
  • Patent number: 10333468
    Abstract: A terahertz wave fast modulator based on coplanar waveguide combining with transistor is disclosed. The terahertz waves are inputted through a straight waveguide structure, and then are coupled through a probe structure onto a core part of the present invention, which includes a suspended coplanar waveguide structure and a modulation unit with high electron mobility transistor, wherein the suspended coplanar waveguide structure is formed by three metal wires and a semiconductor substrate; and the modulation unit with high electron mobility transistor is located between adjacent metal transmission strips of the coplanar waveguide structure. Transmission characteristics of the terahertz waves in the coplanar waveguide structure are changed through the switching on/off of the modulation unit, so as to fast modulate the amplitudes and phases of the terahertz waves, and finally the modulated terahertz waves are transmitted through a probe—waveguide structure.
    Type: Grant
    Filed: June 13, 2017
    Date of Patent: June 25, 2019
    Assignee: University of Electronic Science and Technology of China
    Inventors: Yaxin Zhang, Han Sun, Yuncheng Zhao, Shixiong Liang, Ziqiang Yang
  • Patent number: 10324037
    Abstract: An extremely sensitive spectroscopy method utilizes a laser modified to an extremely low emission with an integrated control system, interfaced within a typical Raman platform to comprise low energy laser spectroscopy (LELS). LELS acquires and utilizes a quantum entangled state of photons and particles, including omnipresent cosmological dark matter particles (OCDM) and omnipresent cosmological dark energy (OCDE). The OCDM and OCDE matter has an affinity to particles of same OCDM and OCDE matter in target specimens, with same-time data results of high sensitivity. In a semiconductor light emitter, electron flow at a low energy level is provided to a quantum well to produce a quantum tunneling of electrons into an active region of the laser quantum well and creating sublasering. Sublasering allows OCDM and OCDE to become entangled with other particles and energies in the laser's quantum well and create a transmission package comprising quantum entangled fields, waves, wave packages, states and energies.
    Type: Grant
    Filed: December 3, 2014
    Date of Patent: June 18, 2019
    Inventor: Gustav Hudson
  • Patent number: 10288981
    Abstract: A laser light-source apparatus includes a control unit configured to perform control in such a manner that a seed light source is driven in a pulse oscillation mode of oscillating pulse light based on gain switching in an output permitted state where output of pulse light from the apparatus is permitted, and is driven in a continuous oscillation mode of oscillating continuous light in an output stopped state in which the output of the pulse light from the apparatus is stopped, with power of excitation light for a solid state amplifier maintained, and adjusts power of laser light input to the solid state amplifier from the seed light source in the continuous oscillation mode in such a manner that the solid state amplifier outputs light with substantially same average power in the output stopped state and in the output permitted state.
    Type: Grant
    Filed: March 30, 2016
    Date of Patent: May 14, 2019
    Assignee: SPECTRONIX CORPORATION
    Inventors: Joji Okada, Yosuke Orii, Shinichi Murayama, Daisuke Okuyama
  • Patent number: 10291324
    Abstract: An optoelectronic transceiver includes an optoelectronic transmitter, an optoelectronic receiver, memory, and an interface. The memory is configured to store digital values representative of operating conditions of the optoelectronic transceiver. The interface is configured to receive from a host a request for data associated with a particular memory address, and respond to the host with a specific digital value of the digital values. The specific digital value is associated with the particular memory address received from the host. The optoelectronic transceiver may further include comparison logic configured to compare the digital values with limit values to generate flag values, wherein the flag values are stored as digital values in the memory.
    Type: Grant
    Filed: February 21, 2017
    Date of Patent: May 14, 2019
    Assignee: Finisar Corporation
    Inventors: Lewis B. Aronson, Lucy G. Hosking
  • Patent number: 10291444
    Abstract: A transmission device outputs a modulated signal based on amplitude information and phase information respectively indicating an amplitude and a phase of a transmission symbol. The transmission device includes: an oscillation signal generation circuit configured to generate an oscillation signal based on the phase information; a laser light source configured to be driven by the oscillation signal; a bias controller configured to control a bias current of the laser light source based on the amplitude information; a photo detector configured to convert an output light of the laser light source into an electric signal; and a bandpass filter configured to filter an output signal of the photo detector so as to output the modulated signal.
    Type: Grant
    Filed: June 19, 2017
    Date of Patent: May 14, 2019
    Assignee: FUJITSU LIMITED
    Inventor: Alexander Nikolaevich Lozhkin
  • Patent number: 10288406
    Abstract: A laser component includes multiple laser devices arranged in an array to include different emission wavelengths, and a driving unit that, while switching each of the laser devices along the array into a turn-ON-enabled state that enables the laser device to turn to an ON state, brings one of the laser devices in the turn-ON-enabled state into an ON state.
    Type: Grant
    Filed: June 21, 2017
    Date of Patent: May 14, 2019
    Assignee: FUJI XEROX CO., LTD.
    Inventor: Takashi Kondo
  • Patent number: 10231038
    Abstract: A silicon-on-insulator chip including an arrayed waveguide grating (AWG) and an array of detector remodulators (DRMs) in a planar arrangement with the AWG such that the modulators or modulators and detectors of said DRMs are located within the same plane as the waveguides of the AWG; and wherein each DRM is located at an input or output of the AWG.
    Type: Grant
    Filed: February 24, 2015
    Date of Patent: March 12, 2019
    Assignee: Rockley Photonics Limited
    Inventors: Andrew Rickman, Aaron Zilkie
  • Patent number: 10205242
    Abstract: THz device includes: a semiconductor substrate; a first semiconductor layer disposed on the semiconductor substrate; an active element formed by being laminated on the first semiconductor layer; a second electrode connected to the first semiconductor layer to be connected to a cathode K of the active element, the second electrode disposed on the semiconductor substrate; a first electrode connected to an anode A of the active element, the first electrode disposed on the semiconductor substrate to be opposite to the second electrode; a rear reflector metal layer disposed on a back side surface of the semiconductor substrate opposite to the first semiconductor layer, wherein the active element forms a resonator between the second and first electrodes, wherein electromagnetic waves are reflected on the rear reflector metal layer, and electromagnetic waves have a surface light-emission radiating pattern or surface light-receiving pattern in a vertical direction to the semiconductor substrate.
    Type: Grant
    Filed: June 6, 2017
    Date of Patent: February 12, 2019
    Assignee: ROHM CO., LTD.
    Inventors: Toshikazu Mukai, Kazuisao Tsuruda
  • Patent number: 10187940
    Abstract: An LED (light-emitting diode) driver for a photoplethysmography system, including a switched-mode operational amplifier for driving a driver transistor with a source-drain path in series with the LED. In a first clock phase in which the LED is disconnected from the driver transistor, the amplifier is coupled in unity gain mode, and a sampling capacitor stores a voltage corresponding to the offset and flicker noise of the amplifier; the gate of the driver transistor is precharged to a reference voltage in this first clock phase. In a second clock phase, the sampled voltage at the capacitor is subtracted from the reference voltage applied to the amplifier input, so that the LED drive is adjusted according to the sampled noise. A signal from the transmitter channel is forwarded to a noise/ripple remover in the receiving channel, to remove transmitter noise from the received signal.
    Type: Grant
    Filed: April 18, 2016
    Date of Patent: January 22, 2019
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Arup Polley, Ajit Sharma, Srinath Ramaswamy, Sriram Narayanan
  • Patent number: 10164763
    Abstract: According to a transmitter, a receiving device, and a frequency offset correction method that are provided in embodiments of the present invention, after a power parameter of a pilot in an OFDM signal received by a receiving device is detected, a frequency offset value used to indicate a degree and a direction that are of a difference that is between a center frequency of a filter and a center frequency of a laser and that deviates from a first threshold is determined according to the power parameter of the pilot, and then the receiving device corrects the difference between the center frequency of the laser and the center frequency of the filter according to the determined frequency offset value, thereby implementing frequency offset correction of an OFDM system.
    Type: Grant
    Filed: November 14, 2016
    Date of Patent: December 25, 2018
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Yuanyuan Fang, Jialong Shuai, Qiang Zhang
  • Patent number: 10153612
    Abstract: A method includes receiving a mode control signal indicative of a current-mode or a voltage-mode. When the mode control signal is indicative of the voltage-mode, the method includes connecting a voltage-mode bias sub-circuit to an anode of a reflector-section diode and applying an adjustable bias voltage to bias a diode voltage at the anode of the reflector-section diode. The reflector-section diode is disposed on a shared substrate of a tunable laser. When the mode control signal is indicative of the current-mode, the method includes connecting a current-mode bias sub-circuit to the anode of the reflector-section diode and delivering an adjustable bias current to the anode of the reflector-section diode.
    Type: Grant
    Filed: October 31, 2017
    Date of Patent: December 11, 2018
    Assignee: Google LLC
    Inventors: Tao Zhang, Xiangjun Zhao, Changhong Joy Jiang, Liang Du, Shuang Yin, Cedric Fung Lam, Adam Edwin Taylor Barratt
  • Patent number: 10126559
    Abstract: A system based on recombination by superposition using a diffractive optical element DOE to combine the beams is provided. An optical diffractive assembly is placed upstream of a diffractive optical element to make it possible, via an appropriate imaging system, to optimize the combining efficiency in the ultra-short pulse regime.
    Type: Grant
    Filed: May 26, 2015
    Date of Patent: November 13, 2018
    Assignee: THALES
    Inventors: Jérôme Bourderionnet, Arnaud Brignon
  • Patent number: 10101550
    Abstract: A heat-sinking package of an optical fiber combiner comprising an optical fiber combiner assembly and a case operates for a uniform temperature gradient inside the case. The optical fiber combiner assembly, fixed inside the case, comprises an overlay structure and an optical fiber combiner. The overlay structure comprises a long shallow receptacle divided by three compartments on upper side of the overlay structure, in which the optical fiber combiner is fixed with three epoxies respectively applied in the three compartments. The three epoxies with different refractive indices accommodated in the three compartments of the long shallow receptacle not only fix the optical fiber combiner in place but also serve thermal contacts to effectively disperse the heat generated in the optical fiber combiner to the overlay structure, further dispersing to surroundings of the case. The overlay structure further comprises one or more thermally conductive sheaths to more efficiently disperse the heat.
    Type: Grant
    Filed: October 7, 2017
    Date of Patent: October 16, 2018
    Assignee: Lightel Technologies, Inc.
    Inventors: Chungho Hsia, Pai-Sheng Shen
  • Patent number: 10084239
    Abstract: A spatial modulator for RF beams (microwave (uW), millimeter wave (MMW), and sub-millimeter wave (sub-MMW)) using dynamically-writable highly-reflective regions, with sub-wavelength diffractive pattern spatial definition that is finer than the wavelength of the incident RF beam.
    Type: Grant
    Filed: March 15, 2016
    Date of Patent: September 25, 2018
    Assignee: Vadum, Inc.
    Inventors: Jesse Hart Shaver, Francois Jacques Malassenet
  • Patent number: 10050407
    Abstract: Generally discussed herein are systems, devices, and methods for providing a frequency stabilized optical frequency comb, including frequency stabilizing the optical frequency comb to a laser that is frequency stabilized to an optical reference cavity, generating a low frequency electrical signal from the optical frequency comb, comparing the generated low frequency electrical signal to a reference low frequency electrical signal, determining an optical reference cavity drift based on the comparison, and then adjusting a frequency of the laser in response to the determined optical reference cavity drift.
    Type: Grant
    Filed: July 12, 2017
    Date of Patent: August 14, 2018
    Assignee: Raytheon Company
    Inventors: Javier H. Fernandez, Todd O. Clatterbuck, Gabriel N. Price, Andrew N. Daniele, Michael S. Lackey, Chon Thai, Darcy Bibb
  • Patent number: 9985414
    Abstract: Apparatus and associated methods relate to an open-loop control circuit (OLCC) configured to determine a lasing element drive current as a function of a commanded optical power signal and a measured temperature signal, where the absolute value of the second derivative of the optical output power with respect to laser drive current exceeds a predetermined threshold. In an illustrative example, the absolute value of the second derivative may exceed the predetermined threshold in a non-linear operating region of the laser element. The non-linear operating region may represent, for example, a characteristic output power vs. drive current curve of the lasing element. The OLCC may provide laser peak power control for arbitrary peak power, within linear and non-linear regions of laser efficiency. In some embodiments, the OLCC may substantially improve control over laser optical output power over a wide dynamic range of, for example, temperature associated with the lasing element.
    Type: Grant
    Filed: June 16, 2017
    Date of Patent: May 29, 2018
    Assignee: Banner Engineering Corp.
    Inventor: Ashley Wise