For Driving Or Controlling Laser Patents (Class 372/38.02)
  • Patent number: 11114820
    Abstract: A push-pull circuit for an opto-electronic device includes: an output node; a pull-up circuit that, in operation, controls a falling edge rate of an input signal to the opto-electronic device while sharing charge with the output node; and a pull-down circuit that, in operation, controls a rising edge rate of the input signal to the opto-electronic device while sharing charge with the output node.
    Type: Grant
    Filed: November 12, 2018
    Date of Patent: September 7, 2021
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Zhubiao Zhu, Clinton Harold Parker, Daniel Alan Berkram
  • Patent number: 11099467
    Abstract: A micro laser diode projector comprises: an MEMS scanning device, which rotates around a first axis and a second axis that are orthogonal to each other; and a micro laser diode light source including at least one micro laser diode, wherein the micro laser diode light source is mounted on the MEMS scanning device and rotates around the first and second axes with the MEMS scanning device to project light to a projection screen. An electronics apparatus including the micro laser diode projector is also discussed.
    Type: Grant
    Filed: February 6, 2017
    Date of Patent: August 24, 2021
    Assignee: GOERTEK INC.
    Inventors: Zhe Wang, Quanbo Zou, Qinglin Song, Jialiang Yan, Yujing Lin, Xiaoyang Zhang
  • Patent number: 11095093
    Abstract: A laser driver with high-speed and high-current and current modulating method thereof is invented. The laser driver includes a first driving unit and a second driving unit, each driving unit including a pre-drive amplifier circuit and a main drive amplifier circuit. The pre-drive amplifier circuit includes a first differential transistor pair circuit, a differential voltage conversion circuit, a DC common mode level reduction circuit and a first cascode current mirror circuit. The main drive amplifier circuit includes a second differential transistor pair circuit, a bandwidth boost circuit, a matching circuit and a second cascode current mirror circuit. The present invention avoids the enhancement of chip area caused by the use of passive inductors peaking mode to enhance bandwidth, and reduces the cost of chip, design complexity and circuit power consumption.
    Type: Grant
    Filed: January 12, 2020
    Date of Patent: August 17, 2021
    Assignees: ANHUI TRANSILICA MICROELECTRONICS CO., LTD., JIANGSU KEDA HENGXIN SEMICON TECH CO., LTD.
    Inventors: Fujiang Lin, Ahmed Wahba Abdalla Elsayed, Xi Li
  • Patent number: 10987166
    Abstract: A system for surgical treatment, in particular endovenous laser treatment, includes a laser device and an application module, wherein the laser device comprises a laser light source having at least one first laser diode element and the application module is optically connectable or connected to the laser light source. The application module is designed as a flexurally flexible catheter having an optical waveguide which comprises an RFID chip with a parameter and/or release coding, wherein the laser device comprises a controlling means with an RFID transmitter and receiver unit for reading from and writing to the RFID chip. The controlling means is configured such that an activation of the laser light source ensues in response to the RFID receiver unit detecting a predetermined parameter and/or release coding, and a timestamp is stored on the RFID chip for the invalidating of the catheter.
    Type: Grant
    Filed: September 29, 2017
    Date of Patent: April 27, 2021
    Assignee: IMS GmbH
    Inventor: Michael Schubert
  • Patent number: 10955444
    Abstract: A circuit includes a peak detector, a diode, a dynamic clamp circuit, and an offset correction circuit. The peak detector generates a voltage on the peak detector output proportional to a lowest voltage on the peak defector input. The anode of the diode is coupled to the peak detector input. The dynamic clamp circuit is coupled to the peak detector input and is configured to clamp a voltage on the peak detector input responsive to a voltage on the diode's anode being greater than the lowest voltage on the peak detector's input. The offset correction circuit is coupled to the peak detector output and is configured to generate an output signal whose amplitude is offset from an amplitude of the peak detector output.
    Type: Grant
    Filed: September 30, 2019
    Date of Patent: March 23, 2021
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Marius Vicentiu Dina, Susan Ann Thompson
  • Patent number: 10903832
    Abstract: A current drive circuit has a first transistor that outputs a current, a second transistor connected to the first transistor by cascode connection, a third transistor connected to the second transistor by cascode connection, a first current source that supplies a current to the third transistor and the second transistor, a fourth transistor that shares a gate with the third transistor, a fifth transistor that is connected to the fourth transistor by cascode connection and shares a gate with the second transistor, a second current source that supplies a current to the fourth transistor and the fifth transistor, a sixth transistor that shares a gate with the third transistor and the fourth transistor and controls a gate voltage of the first transistor, and a third current source that supplies a drain current of the sixth transistor.
    Type: Grant
    Filed: March 11, 2019
    Date of Patent: January 26, 2021
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventor: Yoichi Tokai
  • Patent number: 10866338
    Abstract: A droplet timing sensor that detects droplet passage timing by receiving a light from a light source unit with which a droplet is irradiated in an extreme ultraviolet light generating apparatus eliminates an influence of droplet passage on light source control for obtaining a constant light income. The droplet timing sensor includes: a light source unit configured to irradiate a droplet with an illumination light at a predetermined position; a light receiving unit (70) configured to receive the illumination light having passed through the predetermined position and detect a change in a light income; and a light source controller (301) configured to obtain a frequency distribution of light incomes measured multiple times with time using a statistical processing unit (76), and control an output of the light source unit based on a light income at maximum frequency.
    Type: Grant
    Filed: August 8, 2018
    Date of Patent: December 15, 2020
    Assignee: Gigaphoton Inc.
    Inventors: Hideyuki Hayashi, Takeshi Okamoto
  • Patent number: 10825768
    Abstract: A semiconductor device includes a substrate including a resistor region, a plurality of lower patterns in the resistor region, and a resistor line pattern on the plurality of lower patterns and the substrate of the resistor region. The plurality of lower patterns extend in a first direction parallel to a surface of the substrate and are spaced apart from each other in a second direction perpendicular to the first direction and parallel to the surface of the substrate. The resistor line pattern extends in the second direction. The resistor line pattern on the lower patterns has an upper surface and a lower surface protruding in a third direction perpendicular to the surface of the substrate.
    Type: Grant
    Filed: February 15, 2019
    Date of Patent: November 3, 2020
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Tae-Hee Lee, Hee-Sung Kam, Kyoung-Hoon Kim
  • Patent number: 10756509
    Abstract: This invention provides an accurate current mirror circuit in a low voltage headroom applied to common-anode laser drivers, including a reference current detection unit, a tail current source unit, and a control unit. The reference current detection unit generates a bias voltage and a reference voltage according to a reference current from the reference current source; the tail current source unit receives the bias voltage and generate a mirror current accordingly; the control unit receives the reference voltage and an output voltage corresponding to the mirror current and carry out a feedback regulation to the bias voltage accordingly. In this invention, the reference voltage and the output voltage are locked at same level, and then the bias voltage is mirrored to generate the mirror current outputted to the laser, thus avoiding the problem of inaccurate current output caused by the offset of the control unit in the low voltage headroom.
    Type: Grant
    Filed: January 14, 2019
    Date of Patent: August 25, 2020
    Assignee: AMPLIPHY TECHNOLOGIES LIMITED
    Inventors: Hehong Zou, Tianlin Cao, Jie Lou, Zhuoyuan Li
  • Patent number: 10718847
    Abstract: A beacon system includes a controller, a laser module operably connected to the controller, and at least one sensor operably connected to the controller. In such a system, the controller is configured to receive a signal from the at least one sensor, and to determine whether a response to the signal is required.
    Type: Grant
    Filed: January 12, 2018
    Date of Patent: July 21, 2020
    Assignee: LMD Power of Light Corporation
    Inventors: Christopher A. Gagliano, Jeffrey D. Tuller, Jeffrey W. Mock, Brian L. Olmsted
  • Patent number: 10707969
    Abstract: A controller includes an amplification ratio control unit, an amplification unit, a digital conversion unit, and a driving current control unit. The amplification ratio control unit is configured to generate an amplification ratio signal based on an ambient temperature of a laser diode. The amplification unit configured to amplify, based on the amplification ratio signal, a detection current from a photodiode configured to detect light output from the laser diode, and output the detection current as a voltage signal. The amplification ratio signal controls an amplification ratio of the amplification unit. The digital conversion unit is configured to convert the voltage signal into a digital signal. The driving current control unit is configured to control a driving current of a driver configured to drive the laser diode based on the digital signal.
    Type: Grant
    Filed: July 23, 2019
    Date of Patent: July 7, 2020
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Ji Buem Chun, Sung Man Pang, Je Hyeon Yu
  • Patent number: 10700490
    Abstract: A driver for driving laser or a modulator comprises a switch block for switching a current to the laser or modulator and a voltage converter comprising a voltage supply node, an input port for connecting a laser or modulator supply voltage and an output port connected to the switch block. The voltage converter comprises a voltage replica block adapted for generating a pre-defined voltage and is adapted for equalizing DC voltages in the driver by using the pre-defined voltage. The pre-defined voltage approximates the threshold voltage drop of a laser when the driver is connected with a laser or approximates the bias voltage over a modulator when connected with a modulator. The driver comprises a balancer comprising a dummy load connected to the switch block adapted for equalizing voltages in the switch block.
    Type: Grant
    Filed: June 30, 2017
    Date of Patent: June 30, 2020
    Assignees: UNIVERSITEIT GENT, IMEC VZW
    Inventors: Wouter Soenen, Xin Yin
  • Patent number: 10658814
    Abstract: A modulated light source comprises a laser diode and a drive circuit coupled operatively to the laser diode. The laser diode is configured to lase upon passing an above-threshold current for an accumulation period. The drive circuit is configured to draw a priming current through the laser diode over a priming period, the priming current being insufficient to cause the laser diode to lase during the priming period, but sufficient to shorten the accumulation period. The drive circuit is further configured to draw the above-threshold current through the laser diode after the priming period, thereby triggering emission from the laser diode following a shortened accumulation period.
    Type: Grant
    Filed: October 23, 2017
    Date of Patent: May 19, 2020
    Assignee: MICROSOFT TECHNOLOGY LICENSING, LLC
    Inventors: Algird Michael Gudaitis, Raymond Kirk Price, Niranjan Achugundla Puttaswamy, Sheethal Somesh Nayak, John Allen Tardif
  • Patent number: 10651940
    Abstract: A CMOS IR transceiver includes an IR transmitter circuit, an IR receiver circuit, and an IR diode configured to either emit or receive an IR signal. CMOS elements, such as a PMOS current mirror, a PMOS switch, a NMOS switch, a NMOS current mirror, and a receiver enabling PMOSFET switch are used in the CMOS IR transceiver. The CMOS IR transceiver may have advantages of increased integration, occupying less space, and lower cost.
    Type: Grant
    Filed: August 13, 2019
    Date of Patent: May 12, 2020
    Assignee: Beken Corporation
    Inventors: Long Teng, Jiazhou Liu, Jian Wang
  • Patent number: 10615573
    Abstract: An optical module includes a laser transmitter driver chip, a Distributed Bragg reflection (DBR) raster, a laser transmitter, a first resistor, a first capacitor, a second resistor, a second capacitor and a power source. The first resistor is connected between a power source and a differential signal output positive terminal of the laser transmitter; the first capacitor is connected between the differential signal output positive terminal and the a positive terminal of the laser transmitter; the second resistor is connected between the power source and a differential signal output negative terminal of the laser transmitter driver chip; the second capacitor is connected between the differential signal output negative terminal and a negative terminal of the laser transmitter; and the negative terminal of the laser transmitter and a negative terminal of the DBR raster are grounded.
    Type: Grant
    Filed: September 21, 2018
    Date of Patent: April 7, 2020
    Assignees: HISENSE BROADBAND MULTIMEDIA TECHNOLOGIES, LTD., HISENSE USA CORP., HISENSE INTERNATIONAL CO., LTD.
    Inventors: Hongping Yan, Dengshan Xue, Qisheng Zhao, Ming Li
  • Patent number: 10608408
    Abstract: The present disclosure is generally directed to a laser subassembly for use in a TOSA module that includes an integrated impedance matching network to enable a plurality of selectable resistance configurations to ensure the driving circuit and laser emitter of the TOSA module have matching, or substantially matching, impedances. The laser subassembly includes a substrate with a driving circuit disposed thereon. The driving circuit includes signal conductors for electrically coupling to an external transmit connecting circuit, a conductive laser mounting section, and an impedance matching network. The impedance matching network includes a plurality of resistors, with one or more of the resistors being selectively electrically coupled to the conductive laser mounting section to introduce a selected amount of impedance to minimize or otherwise reduce reflection.
    Type: Grant
    Filed: November 28, 2018
    Date of Patent: March 31, 2020
    Assignee: Applied Optoelectronics, Inc
    Inventors: Kai-Sheng Lin, Ziliang Cai, Chong Wang
  • Patent number: 10574026
    Abstract: A driver circuit for driving a laser diode is described herein. In accordance with a first exemplary embodiment the driver circuit includes a first electronic switch connected to an output node that is configured to be operably connected to a laser diode. The electric connection between the first electronic switch and the output node has a first inductance. The driver circuit further includes a bypass circuit that is coupled to the output node and configured to take over, when activated, the current supplied to the output node via the first electronic switch, thus magnetizing the first inductance.
    Type: Grant
    Filed: March 16, 2018
    Date of Patent: February 25, 2020
    Assignee: Infineon Technologies AG
    Inventors: Franco Mignoli, Maurizio Galvano, Andrea Logiudice
  • Patent number: 10566762
    Abstract: The present disclosure is directed to an optical device including at least one temperature-dependent tunable element for controlling a wavelength of an optical signal, a first temperature control circuit for controlling a temperature of a first region of the optical device; and a second temperature control circuit for controlling a temperature of a second region of the optical device. The second region may include a portion of the first region. The second region may be smaller than the first region. The tunable element may be positioned in the second region such that a temperature of the tunable element is controlled based on the second temperature control circuit controlling the temperature of the second region. The tunable element may be one of (i) a laser for transmitting an outgoing optical signal and (ii) an optical filter coupled to a photodetector for receiving an incoming optical signal.
    Type: Grant
    Filed: May 14, 2018
    Date of Patent: February 18, 2020
    Assignee: Go!Foton Holdings, Inc.
    Inventors: Feng Tian, Chi Kong Paul Ng
  • Patent number: 10530484
    Abstract: An integrated high speed electro-optical control loop for very high-speed linearization and temperature compensation of an electro-absorption modulator (EAM) for analog optical data center interconnect applications is disclosed. The control loop can function in a stable manner because the electronics and optical components are monolithically integrated on a single substrate in small form factor. Because of the small size enabled by monolithic integration, the temperatures of the optical blocks and electronics blocks are tightly coupled, and the control loop time delays and phase delays are small enough to be stable, even for very high frequency operation. This arrangement enables a low cost, low power analog transmitter implementation for data center optical interconnect applications using advanced modulation schemes, such as PAM-4 and DP-QPSK.
    Type: Grant
    Filed: January 31, 2019
    Date of Patent: January 7, 2020
    Assignee: ElectroPhotonic-IC Inc.
    Inventors: Gudmundur A. Hjartarson, William A. Hagley
  • Patent number: 10476229
    Abstract: Systems and methods for calibrating, operating, and setting the magnitude of the power of light provided by a laser diode in a conducted electrical weapon (“CEW”). The light of the laser diode assists in targeting by providing a visible indication of the projected point of impact of the tethered electrode of the CEW. The calibration process enables laser diode of a CEW to operate within regional guidelines of the maximum output power of light permitted by a laser. The method further permits the magnitude of the power of the light provided by a laser diode to be set and operated in changing environmental conditions in the field.
    Type: Grant
    Filed: July 24, 2017
    Date of Patent: November 12, 2019
    Assignee: AXON ENTERPRISE, INC.
    Inventor: Magne Nerheim
  • Patent number: 10471274
    Abstract: A battery-powered laser-based dermatological treatment device may include a laser unit comprising at least one laser diode, a battery unit, at least one sensor configured to generate sensor signals, and a laser drive control system including a laser drive circuit comprising the laser unit, the battery unit, a first switch (e.g., a first FET), and a second switch (e.g., a second FET), wherein the laser unit is arranged in series between the first switch and the second switch, and control electronics configured to control the first switch based at least on sensor signals from the at least one sensor, and control the second switch using pulse width modulation (PWM), thereby delivering current from the battery unit to the laser unit with a PWM current waveform. The laser drive circuit may also include a snubber circuit configured to prevent voltage spikes upon the second switch being turned off.
    Type: Grant
    Filed: January 29, 2014
    Date of Patent: November 12, 2019
    Assignee: CHANNEL INVESTMENTS, LLC
    Inventors: Harvey I-Heng Liu, John P. Beale
  • Patent number: 10461498
    Abstract: A method for biasing a tunable laser during burst-on and burst-off states through a common-cathode laser driving circuit includes delivering a bias current to an anode of a gain-section diode having a shared substrate with the laser, and receiving a burst mode signal indicative of a burst-on state or a burst-off state. When the burst mode signal is indicative of the burst-off state, the method includes sinking a sink current away from the anode of the gain-section diode. The sink current is less than the bias current delivered to the anode of the gain-section diode. When the burst mode signal transitions to be indicative of the burst-on state from the burst-off state, the method includes ceasing the sinking of the sink current away from the anode of the gain-section diode, and delivering an overshoot current to the anode of the gain-section diode to accelerate heating of the gain-section diode.
    Type: Grant
    Filed: October 1, 2018
    Date of Patent: October 29, 2019
    Assignee: Google LLC
    Inventors: Tao Zhang, Liang Du, Xiangjun Zhao, Changhong Joy Jiang, Cedric Fung Lam, Shuang Yin, Adam Edwin Taylor Barratt
  • Patent number: 10355442
    Abstract: An optical module that includes at least one semiconductor optical device, a carrier, a housing, and eutectic alloy that fixes the carrier to the housing is disclosed. The carrier mounts a component that couples with the semiconductor optical device. The housing, which includes a side wall made of ceramics and a base made of metal to form a space that encloses the semiconductor optical device, the carrier, and the component therein. The carrier provides a room facing the base and the side wall, where the room receives excess eutectic alloy oozing out from a gap between the carrier and the base.
    Type: Grant
    Filed: July 26, 2018
    Date of Patent: July 16, 2019
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Yasushi Fujimura, Taichi Misawa
  • Patent number: 10327626
    Abstract: A light source apparatus includes at least one light-emitter, a driving circuit, an input unit, a temperature control circuit, and an effective light power setting circuit. The driving circuit allows the light-emitter to emit light by applying a driving waveform to the light-emitter. The effective light power setting circuit drives the driving circuit to allow the light-emitter to emit light with a predetermined effective light power, in accordance with a driving condition set by the temperature control circuit. The temperature control circuit controls the light-emitter to be in a predetermined heat generation state by increasing or decreasing a heat generation amount of the light-emitter without changing the predetermined effective light power of the light emitted from the light-emitter by adjusting the driving condition of the light-emitter.
    Type: Grant
    Filed: September 2, 2016
    Date of Patent: June 25, 2019
    Assignee: OLYMPUS CORPORATION
    Inventor: Masahiro Nishio
  • Patent number: 10277006
    Abstract: Provided is a technology for suppressing variations in the waveform of a light emission pulse caused by various factors in a light-emitting device. A light-emitting device is provided with: a light source 101 in which relaxation oscillation occurs immediately after energization; a light source drive circuit 104 which includes a differentiation circuit 102 having a resistor and a capacitor connected in parallel, and in which a switching element 103 for voltage application is connected in series with the differentiation circuit; a power supply circuit 105; a light-reception element 107 which detects pulsed light emitted from the light source 101; and a voltage control unit 109 which controls an output voltage from the power supply circuit 105 in correspondence with the waveform of the detected pulsed light.
    Type: Grant
    Filed: April 28, 2016
    Date of Patent: April 30, 2019
    Assignee: TOPCON CORPORATION
    Inventors: Suguru Miyagawa, Yoshiaki Goto, Yoshikatsu Tokuda
  • Patent number: 10234765
    Abstract: Excimer laser annealing apparatus includes and excimer laser delivering laser-radiation pulses to a silicon layer supported on a substrate translated with respect to the laser pulses such that the consecutive pulses overlap on the substrate. The energy of each of the laser-radiation pulses is monitored, transmitted to control-electronics, and the energy of a next laser pulse is adjusted by a high-pass digital filter.
    Type: Grant
    Filed: June 5, 2017
    Date of Patent: March 19, 2019
    Assignee: COHERENT LASERSYSTEMS GMBH & CO. KG
    Inventor: Igor Bragin
  • Patent number: 10230213
    Abstract: A semiconductor laser driving circuit that ensures the satisfied extinction ratio, the accuracy of the light output, and enables the light output dynamically to change based on a modulation signal.
    Type: Grant
    Filed: July 11, 2018
    Date of Patent: March 12, 2019
    Assignee: SHIMADZU CORPORATION
    Inventors: Ichiro Fukushi, Akiyuki Kadoya, Kazuma Watanabe
  • Patent number: 10178772
    Abstract: A controllable current driver integrated circuit is provided. The controllable current driver includes a multitude of different current value output transistors digitally controlled and combined to provide a controllable current output. The different current value transistors are each provided as single lithographic devices on a same substrate in proximity to each other having weighted drain and source areas corresponding to the different current values. The weighted drivers reduce the implementation area required on the semiconductor die for decoding and driving the output transistors substantially increasing the density of current drivers which can be integrated in one semiconductor die.
    Type: Grant
    Filed: July 24, 2014
    Date of Patent: January 8, 2019
    Assignee: 4233999 CANADA INC.
    Inventors: Najeeb Ashraf Khalid, Maksymilian Wulkan
  • Patent number: 10148357
    Abstract: Non-ideal downstream loading of a differential driver in a single ended circuit driving a communications laser—e.g., Electro absorption Modulated Laser (EML)—may be compensated by deploying a second matching network at the non-functional (terminated) driver output node. Certain embodiments may further compensate for distortion arising from circuit non-ideality, by introducing a laser replica downstream of the second matching network to mimic electrical properties of the laser. Embodiments may sufficiently compensate for downstream circuit non-ideality to allow replacing the bulky choke inductor of a bias tee, with a resistor. Substituting a resistor for a more complex inductor structure can simplify design and fabrication of the single-ended driver circuit, and also reduce footprint by eliminating area formerly occupied by the choke inductor.
    Type: Grant
    Filed: May 24, 2017
    Date of Patent: December 4, 2018
    Assignee: INPHI CORPORATION
    Inventors: Halil Cirit, Karthik Gopalakrishnan, Karim Abdelhalim, Jorge Pernillo, Lawrence Tse
  • Patent number: 10133205
    Abstract: An imaging device has a photoconductor with a surface that is selectively discharged by a light from a laser diode to create a latent electrostatic image for attracting toner for transfer to a media. A circuit drives the laser diode. The circuit has a switch for turning on and off the light, a resistor complementary to the laser diode selectively connectable to the switch, and a passive circuit component coupled to the laser diode. The passive circuit component is a delay line, inductor, choke, coiled wire, or ferrite bead is contemplated. It may also typify a length of copper tracing on a printed circuit board that supports the laser diode. The circuit causes an initial overshoot voltage spike in an on voltage pulse that is about 20% or more than the settled on voltage. The voltage spike dampens out in about one-fourth of a total voltage on time of the pulse.
    Type: Grant
    Filed: March 29, 2017
    Date of Patent: November 20, 2018
    Assignee: LEXMARK INTERNATIONAL, INC.
    Inventors: John Bruce Berry, William Pohl Corbett, Jr., Robert Michael Tulenko
  • Patent number: 10122151
    Abstract: An optical module includes a laser transmitter driver chip, a Distributed Bragg reflection (DBR) raster, a laser transmitter, a first resistor, a first capacitor, a second resistor, a second capacitor and a power source. The first resistor is connected between a power source and a differential signal output positive terminal of the laser transmitter; the first capacitor is connected between the differential signal output positive terminal and the a positive terminal of the laser transmitter; the second resistor is connected between the power source and a differential signal output negative terminal of the laser transmitter driver chip; the second capacitor is connected between the differential signal output negative terminal and a negative terminal of the laser transmitter; and the negative terminal of the laser transmitter and a negative terminal of the DBR raster are grounded.
    Type: Grant
    Filed: March 31, 2016
    Date of Patent: November 6, 2018
    Assignees: HISENSE BROADBAND MULTIMEDIA TECHNOLOGIES, LTD., HISENSE USA CORP., HISENSE INTERNATIONAL CO., LTD.
    Inventors: Hongping Yan, Dengshan Xue, Qisheng Zhao, Ming Li
  • Patent number: 10116114
    Abstract: According to the invention, a plurality of elementary laser beams (fi) are generated, the phases of which are adjusted by an electro-optical feedback loop (6, 7i, 8i, 9) implementing the matrix equation of a phase-contrast filtering device (6).
    Type: Grant
    Filed: October 14, 2015
    Date of Patent: October 30, 2018
    Assignees: COMPAGNIE INDUSTRIELLE DES LASERS CILAS, CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE (CNRS), UNIVERSITE DE LIMOGES
    Inventors: Vincent Kermene, Agnes Desfarges-Berthelemot, Paul Armand, Joel Benoist, David Kabeya, Alain Barthelemy, David Sabourdy, Jean-Eucher Montagne
  • Patent number: 10095154
    Abstract: A light scanning apparatus, including: a light source configured to emit a light beam; a light intensity detection portion configured to detect a light intensity of the light beam; and a light intensity control portion configured to control the light intensity of the light beam based on a detection result of the light intensity detection portion, wherein the light intensity control portion supplies, in advance, to the light source, a bias current equal to or less than a threshold current at which the light source starts emitting the light beam, and supplies, to the light source, a switching current superposed on the bias current, the switching current being modulated in order to control light emission of the light source in accordance with an image signal, and wherein the light intensity control portion includes a bias current changing unit configured to change the bias current.
    Type: Grant
    Filed: May 26, 2017
    Date of Patent: October 9, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Yuichi Seki
  • Patent number: 9998228
    Abstract: Systems and methods described herein include methods and systems for controlling bias voltage provided to an optical modulating device. The optical modulating device is biased at a bias point that is different from a null point of the device such that an offset to the received optical power due to limited extinction ratio is reduced.
    Type: Grant
    Filed: November 3, 2016
    Date of Patent: June 12, 2018
    Assignee: INPHI CORPORATION
    Inventors: Shih Cheng Wang, Jinwoo Cho, Shu Hao Fan
  • Patent number: 9948400
    Abstract: A drive circuit includes a bias current supply circuit for supplying a bias current to a light-emitting element and a modulated current supply circuit for supplying a modulated current to the light-emitting element, and has a first path through which the bias current flows, a second path including a path for supplying the modulated current to the light-emitting element from the modulated current supply circuit, through which a current returns to the bias current supply circuit through the modulated current supply circuit from the bias current supply circuit without going through the light-emitting element when the bias current flows, and a third path which is joined to the second path in the modulated current supply circuit and has an adjusting resistance before a junction, through which a current flows through the adjusting resistance to the bias current supply circuit when the bias current flows.
    Type: Grant
    Filed: October 7, 2014
    Date of Patent: April 17, 2018
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventor: Shuitsu Yuda
  • Patent number: 9917415
    Abstract: A driving circuit for causing a light emitting element to emit light in response to a driving signal is provided. The driving circuit comprising a first current supply circuit that starts to supply a driving current to the light emitting element in response to the driving signal, a second current supply circuit that starts to supply a supplementary current to the light emitting element in response to the driving signal. The second current supply circuit stops to supply the supplementary current upon detecting that a voltage applied to the light emitting element has reached a threshold voltage.
    Type: Grant
    Filed: February 10, 2016
    Date of Patent: March 13, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventor: Hiroyuki Nakamura
  • Patent number: 9899797
    Abstract: A laser diode driving method that reliably maintains average optical power and extinction ratio is disclosed. The present invention for laser driving uses a preloaded laser diode characteristic curve/table and/or mathematical equations to create a programmable bias and modulation current range. This ensures stable closed-loop operation and prevents system failure if the feedback signal is impaired by confining the operation of the laser diode to a normal operating range.
    Type: Grant
    Filed: March 16, 2017
    Date of Patent: February 20, 2018
    Assignee: LITRINIUM, INC.
    Inventors: Najabat Hasnain Bajwa, Mikhail Barashenka, Hanqing Qian
  • Patent number: 9891549
    Abstract: A light scanning apparatus, including: a light source configured to emit a light beam; a rotary polygon mirror configured to deflect the light beam emitted from the light source so that the light beam scans on a surface of a photosensitive member in a main scanning direction; a motor configured to rotate the rotary polygon mirror; and a rotational position detection unit configured to detect a magnetic flux change caused by rotation of the motor to generate a rotational position detection signal, wherein an emitting start timing of the light beam from the light source is determined based on the rotational position detection signal in order to maintain a writing start position of the light beam with respect to the photosensitive member in the main scanning direction.
    Type: Grant
    Filed: September 2, 2016
    Date of Patent: February 13, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Yuichi Seki
  • Patent number: 9888555
    Abstract: The transmission system may include: an optical path adjustment device configured to substantially unify optical paths of a first pre-pulse laser beam and a second pre-pulse laser beam; an optical path separation device configured to separate the optical paths of the substantially unified first pre-pulse laser beam and the second pre-pulse laser beam to an optical path for the first pre-pulse laser beam and an optical path for the second pre-pulse laser beam; a first beam adjustment device disposed on the optical path for the first pre-pulse laser beam separated by the optical path separation device and configured to adjust a beam parameter of the first pre-pulse laser beam; and a second beam adjustment device disposed on the optical path for the second pre-pulse laser beam separated by the optical path separation device and configured to adjust a beam parameter of the second pre-pulse laser beam.
    Type: Grant
    Filed: February 2, 2017
    Date of Patent: February 6, 2018
    Assignee: Gigaphoton Inc.
    Inventors: Masahiko Ando, Yoshifumi Ueno, Toru Suzuki
  • Patent number: 9838142
    Abstract: A system uses optical signals to monitor real world inputs and convert them to electrical signals for conventional indication and control systems. Optical signals see use where electrical signals cannot and improve reliability of existing control systems. Optical loops extend to peripheral devices which process the light into discrete or analog light signals. A receiving circuit interprets that signal and converts it to a useable electrical signal of discrete or analog form. The system operates within a range of light wavelength from at least as low as 399 nm up to at least as high as 1801 nm. The system replaces electrical conductors for input cards of Programmable Logic Controller systems. The optical sensing devices withstand electrical surges and immersion into water, do not generate electrical noise, allow for maintenance without shock hazard, and lack susceptibility to electrical or magnetic phenomenon.
    Type: Grant
    Filed: October 15, 2015
    Date of Patent: December 5, 2017
    Inventor: Christopher B. Tyrrell
  • Patent number: 9819151
    Abstract: A laser resonator includes an active material, which amplifies light associated with an optical gain of the resonator, and passive materials disposed in proximity with the active material. The resonator oscillates over one or more optical modes, each of which corresponds to a particular spatial energy distribution and resonant frequency. Based on a characteristic of the passive materials, for the particular spatial energy distribution corresponding to at least one of the optical modes, a preponderant portion of optical energy is distributed apart from the active material. The passive materials may include a low loss material, which stores the preponderant optical energy portion distributed apart from the active material, and a buffer material disposed between the low loss material and the active material, which controls a ratio of the optical energy stored in the low loss material to a portion of the optical energy in the active material.
    Type: Grant
    Filed: June 30, 2014
    Date of Patent: November 14, 2017
    Assignee: CALIFORNIA INSTITUTE OF TECHNOLOGY
    Inventors: Christos T Santis, Scott T Steger, Amnon Yariv
  • Patent number: 9780530
    Abstract: Provided is a butt-jointed (BJ) semiconductor integrated optical device having a high manufacturing yield. A semiconductor integrated optical device, which is configured such that, on a semiconductor substrate, a first semiconductor optical element including an active layer and a second semiconductor optical element including a waveguide layer are butt-jointed to each other with their optical axes being aligned with each other, includes: a semiconductor regrowth layer including at least one of a diffraction grating layer or an etching stop layer, which is formed by one epitaxial growth across an entire surface above the active layer and the waveguide layer; and a cladding layer formed above the semiconductor regrowth layer.
    Type: Grant
    Filed: December 8, 2015
    Date of Patent: October 3, 2017
    Assignee: OCLARO JAPAN, INC.
    Inventors: Koichiro Adachi, Takanori Suzuki, Yasushi Sakuma, Kazuhiko Naoe, Akira Nakanishi
  • Patent number: 9753139
    Abstract: An electro-optical distance measuring device includes a laser driver for a laser diode for emitting laser light pulses. The measuring device further includes a laser diode voltage supply having a cascade of at least two voltage regulators, each of which provides an output voltage at a level below a laser threshold voltage of the laser diode. By changing from a first to a second switching position of an electronic switching element of the measuring device, one of the laser light pulses can be emitted and, in the steady-state first and the steady-state second switching positions, no laser light is emitted.
    Type: Grant
    Filed: December 19, 2013
    Date of Patent: September 5, 2017
    Assignee: LEICA GEOSYSTEMS AG
    Inventors: Kurt Giger, Reto Metzler, Bernhard Fiegl
  • Patent number: 9722695
    Abstract: An optical network unit (ONU) includes an optical transceiver module, a switch, a detecting module, and an ONU chip. The switch is electronically coupled between the optical transceiver module and a power supply. The detecting module is electronically coupled between the switch and the power supply. The detecting module includes a sensor, an amplifier, and a comparator. The sensor is electronically coupled between the power supply and the switch to sense a driving current output from the power supply to the optical transceiver module and output a voltage signal to the amplifier, the amplifier amplifies the voltage signal and outputs an amplified voltage signal to the comparator, the comparator compares the amplified voltage signal with a predetermined voltage signal and outputs a comparison result. The ONU chip controls the switch to connect/disconnect the electrical connection between the optical transceiver module and the power supply according to the comparison result.
    Type: Grant
    Filed: November 20, 2015
    Date of Patent: August 1, 2017
    Assignees: HONG FU JIN PRECISION INDUSTRY (ShenZhen) CO., LTD., HON HAI PRECISION INDUSTRY CO., LTD.
    Inventor: Po-Wen Chiang
  • Patent number: 9667031
    Abstract: An architecture for current driver circuitry for diode laser systems is contemplated whereby the circuitry is both modular and minimally complex with respect to the number of components and connections.
    Type: Grant
    Filed: November 24, 2015
    Date of Patent: May 30, 2017
    Assignee: Coherent, Inc.
    Inventors: Ulrich Ritter, Jerry Chang
  • Patent number: 9651289
    Abstract: An adder adds a phase ?plus, which is n times a size of 60 degrees, to a phase output from a phase switching unit and outputs the phase as a voltage command phase ?. A voltage generation unit generates voltage command value based on the voltage command phase output by the adder and outputs the command value. A drive-signal generation unit, based on an output from the voltage generation unit generates drive signals corresponding to respective switching elements of an inverter, and outputs respective generated drive signals to the corresponding switching elements of the inverter, and generates a high-frequency AC voltage in the inverter.
    Type: Grant
    Filed: August 30, 2010
    Date of Patent: May 16, 2017
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kazunori Hatakeyama, Takuya Shimomugi, Shinya Matsushita, Naoki Wakuta, Tsutomu Makino, Shinsaku Kusube
  • Patent number: 9627848
    Abstract: A method and apparatus for powering up and powering down a laser diode and its driver are disclosed. The disclosed method and apparatus enable the use of deep sub-micron CMOS technology to build a laser diode driver (LDD), while ensuring the low voltage limits prescribed by such technology are not exceeded. Building an LDD with deep sub-micron CMOS technology pushes circuit integration further ahead, bringing cost of LDDs and required board circuits down.
    Type: Grant
    Filed: January 6, 2016
    Date of Patent: April 18, 2017
    Assignee: Microsemi Storage Solutions (U.S.), Inc.
    Inventors: Jean-Francois Delage, Guillaume Fortin, Tiberiu Galambos
  • Patent number: 9557293
    Abstract: This invention relates to methods and apparatus of a combination of multi-laser wave mixing technology with diagnostic flow system with embodiments describing capillary electrophoresis. The unique combination of these technologies along with minute detection levels not yet been seen in the field.
    Type: Grant
    Filed: December 15, 2014
    Date of Patent: January 31, 2017
    Inventor: Behrokh Bagherifar Sadri
  • Patent number: 9397473
    Abstract: A transmitter module that includes a laser diode (LD) and a driver, each mounted on a sub-mount, is disclosed. The driver directly drives the LD by supplying a modulation signal, a bias signal, and a reference. Two signals are provided to a first pad of the LD, while, the reference is provided to the second pad of the LD. The second pad in the center thereof is formed relatively closer to the second facet of the LD opposite to the first facet through which the laser light is emitted.
    Type: Grant
    Filed: September 29, 2014
    Date of Patent: July 19, 2016
    Assignee: Sumitomo Electric Device Innovations, Inc.
    Inventors: Yasuo Yamasaki, Nobumasa Okada
  • Patent number: 9370056
    Abstract: A driving apparatus and method for a dimmable LED is provided. The apparatus includes a dimmer switch which controls connection or disconnection of an LED series. The apparatus further includes: a boost circuit electrically coupled to the LED series; a comparator electrically coupled to the boost circuit, the comparator receiving a triangle wave signal to generate a PWM signal, the PWM signal controlling the boost circuit; and a RC circuit electrically coupled to the comparator, the RC circuit utilized to output a charging curve signal to the comparator when the dimmer switch disconnects, thereby improving noise and electromagnetic interference of the boost circuit.
    Type: Grant
    Filed: January 22, 2013
    Date of Patent: June 14, 2016
    Assignee: SHENZHEN CHINA STAR OPTOELECTRONICS TECHNOLOGY CO., LTD.
    Inventors: Anle Hu, Xiang Yang, Hua Zhang