For Driving Or Controlling Laser Patents (Class 372/38.02)
  • 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: 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: 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: 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
  • Patent number: 9338036
    Abstract: One embodiment of the present invention sets forth a mechanism for transmitting and receiving differential signals. A transmitter combines a direct current (DC) to DC converter including a capacitor with a 2:1 multiplexer to drive a pair of differential signaling lines. The transmitter drives a pair of voltages that are symmetric about the ground power supply level. Signaling currents are returned to the ground plane to minimize the generation of noise that is a source of crosstalk between different differential signaling pairs. Noise introduced through the power supply is correlated with the switching rate of the data and may be reduced using an equalizer circuit.
    Type: Grant
    Filed: January 30, 2012
    Date of Patent: May 10, 2016
    Assignee: NVIDIA Corporation
    Inventors: John W. Poulton, Thomas Hastings Greer, III, William J. Dally
  • Patent number: 9325153
    Abstract: An optical module capable of monitoring an inner temperature thereof by a simple arrangement is disclosed. The optical module installs an avalanche photodiode (APD). The APD generates the first photocurrent under a bias where the APD shows the multiplication factor thereof M equal to the unity, and the second photocurrent under another bias where the multiplication factor becomes greater than the unity. The operating temperature of the laser diode (LD) may be estimated from a ratio of the first photocurrent to the second photocurrent.
    Type: Grant
    Filed: August 21, 2014
    Date of Patent: April 26, 2016
    Assignee: Sumitomo Electric Device Innovations, Inc.
    Inventors: Kenji Otobe, Kenichi Nakayama
  • Patent number: 9325421
    Abstract: A burst-mode laser control circuit and related methods thereof are disclosed. Using an APC loop with an additional burst-mode control circuit, and a switch in series with a diode and in parallel with the laser, a continuous-mode laser driver is enabled to operate in burst-mode by turning the switch on or off via external logic. Burst-mode control manages the switch, and a bandwidth-select circuit using a high or low logic level input, wherein the laser is disabled and the bandwidth-select circuit enters a fast-track mode when the external logic signal has a first level. The laser provides regular optical signals, and the bandwidth-select circuit enters a slow-track mode, thereby enabling the APC loop to operate normally, when the external logic signal has a second level. In addition to a low cost and simple implementation, the control circuit and method provide lasers with a fast response capability using one or more externally-controlled switch circuits to meet demands of PON systems for burst-mode ONUs.
    Type: Grant
    Filed: June 30, 2014
    Date of Patent: April 26, 2016
    Assignee: Source Photonics (Chengdu) Co., Ltd.
    Inventors: Xu Jiang, Yuan Song, Shuyuan Zhang, Yuanzhong Xu
  • Patent number: 9295144
    Abstract: A lighting device includes a AC/DC or DC/DC power converter, a controller/processor electrically connected to the AC/DC or DC/DC power converter, a light emitting diode (LED) current control circuit communicably coupled to the controller/processor and electrically connected to the AC/DC or DC/DC power converter, and one or more LEDs electrically connected to the LED current control circuit.
    Type: Grant
    Filed: November 11, 2013
    Date of Patent: March 22, 2016
    Assignee: ILUMI SOLUTIONS, INC.
    Inventors: Swapnil Bora, Corey Egan
  • Patent number: 9270075
    Abstract: A supercontinuum source capable of emitting waves between the infrared range and the ultraviolet range, includes a pulsed laser source (12) capable of generating a laser beam and a non-linear microstructured optical fiber (14) capable of receiving the laser beam, in such a way that the supercontinuum source is capable of generating a beam (F?) over a pulse duration (T?), characterized in that the supercontinuum source includes elements for varying the pulse duration.
    Type: Grant
    Filed: April 8, 2011
    Date of Patent: February 23, 2016
    Assignees: UNIVERSITE DE LIMOGES, LEUKOS, MULTITEL
    Inventors: Philippe Leproux, Vincent Couderc, Yves Hernandez, Anthony Bertrand, Marco Andreana, Stephane Hilaire, Philippe Roy
  • Patent number: 9263854
    Abstract: Technologies are generally described for implementing non-linear VCSEL equalization. In some examples, a rising edge tap parameter, a falling edge tap parameter, an equalization delay and a bias current may be used to equalize a data signal to be output from a VCSEL. A VCSEL model may be used to derive a VCSEL response to one or more isolated data pulses. The derived response may then be used to determine the rising and falling edge tap parameters and an equalization delay, based on a bias current value for the VCSEL and a data rate associated with the data signal. The data signal may then be adjusted based on the equalization delay and the rising and falling edge tap parameter and sent to the VCSEL for output. At the same time, the VCSEL may be biased with a bias current having the bias current value.
    Type: Grant
    Filed: May 29, 2015
    Date of Patent: February 16, 2016
    Assignee: CALIFORNIA INSTITUTE OF TECHNOLOGY
    Inventors: Mayank Raj, Azita Emami
  • Patent number: 9209599
    Abstract: Symmetrical, direct coupled laser drivers for high frequency applications. The laser drivers are in integrated circuit form and use a minimum of relatively small (low valued) external components for driving a laser diode coupled to the laser driver through transmission lines. An optional amplifier may be used to fix the voltage at an internal node at data frequency spectrum to improve circuit performance. Feedback to a bias input may also be used to fix the voltage at the internal node. Programmability and a burst mode capability may be included.
    Type: Grant
    Filed: March 2, 2015
    Date of Patent: December 8, 2015
    Assignee: Maxim Integrated Products, Inc.
    Inventors: James Cong Nguyen, Ashok Kumar Verma
  • Patent number: 9153936
    Abstract: An optical transmitter is disclosed. In accordance with some embodiments of the present disclosure, an optical transmitter may comprise a vertical-cavity surface-emitting laser (VCSEL) and a VCSEL driver. The VCSEL driver may comprise an input stage configured to receive a voltage signal and a low-impedance output stage comprising an input coupled to the input stage and a low-impedance output coupled to the VCSEL and configured to provide a modulated output current to the VCSEL.
    Type: Grant
    Filed: June 20, 2013
    Date of Patent: October 6, 2015
    Assignee: Fujitsu Limited
    Inventors: Tony Shuo-Chun Kao, Nikola Nedovic
  • Patent number: 9130341
    Abstract: A semiconductor laser drive apparatus includes: a current setting circuit that stores a first set value for a light-emission current obtained by subtracting a first bias current used when the semiconductor laser element emits light, from a drive current used when the semiconductor laser element emits light, a second set value for the first bias current, and a third set value for a second bias current used when the semiconductor laser element does not emit light; a first current generator circuit that generates a first input current from the first set value; a second current generator circuit that generates a second input current from the second set value and a third input current from the third set value; and a switching circuit that supplies a sum of the first and second input currents to a drive circuit when a light-emission control signal is on, and the third input current to the drive circuit when the light-emission control signal is off.
    Type: Grant
    Filed: May 9, 2014
    Date of Patent: September 8, 2015
    Assignee: RICOH COMPANY, LTD.
    Inventors: Daijiro Sumino, Takao Watanabe
  • Patent number: 9130343
    Abstract: A gas laser oscillator including a discharge tube provided in a gas channel through which a laser gas circulates; an output command part outputting a power output command; a power supply part applying to the discharge tube a discharge tube voltage corresponding to a power output command value; a voltage detector detecting the discharge tube voltage; and a discharge start judging part judging if a discharge has been started in the discharge tube based on a ratio of change of the discharge tube voltage. The output command part increases the power output command value in steps by an increment obtained by dividing a power output command value corresponding to a discharge start voltage serving as a predetermined reference by a number of steps of 2 or more, at a step time interval determined by using as a reference the time required until the power supply part responds to the power output command.
    Type: Grant
    Filed: March 24, 2014
    Date of Patent: September 8, 2015
    Assignee: FANUC CORPORATION
    Inventor: Tooru Nukui