Frequency Patents (Class 372/32)
  • Patent number: 11394460
    Abstract: An optical transmission/reception unit includes a carrier rotatable about a rotational axis, an optical receiver arranged at the carrier on the rotational axis to receive an optical reception signal from a first direction, an optical transmitter arranged adjacent to the optical receiver at the carrier to emit an optical transmission signal in a second direction, and a transmission/reception optic arranged at the carrier on the rotational axis above the optical receiver and extending across the optical receiver and the optical transmitter, wherein the transmission/reception optic includes a reception optic and a transmission optic arranged in the reception optic. The reception optic is configured to guide the optical reception signal incident on the transmission/reception optic towards the optical receiver on the rotational axis, and the transmission optic is arranged above the optical transmitter and is configured to shape the optical transmission signal emitted by the optical transmitter into an output beam.
    Type: Grant
    Filed: October 6, 2020
    Date of Patent: July 19, 2022
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
    Inventor: Tobias Schneider
  • Patent number: 11387908
    Abstract: Provided is an optical transceiver including a reference tunable laser module configured to generate and output light of a reference wavelength; a first general tunable laser module configured to generate and output light of a first wavelength; and a controller configured to control a tuning operation of the first wavelength of the first general tunable laser module, based on information about a relationship between the reference wavelength and the first wavelength.
    Type: Grant
    Filed: November 30, 2020
    Date of Patent: July 12, 2022
    Assignee: SOLiD, INC.
    Inventor: Bum Soo Park
  • Patent number: 11387070
    Abstract: There is described a device for generating electromagnetic field oscillation in a RF device or cavity. The device generally has a photo-diode configured for receiving a laser pulse train and emitting a first electrical signal based thereon, the first electrical signal having a plurality of frequencies; and a harmonics selector configured to output a second electrical signal having one or more frequency of the first electrical signal, the one or more frequency being selected in a manner for the output to generate the electromagnetic field oscillation in the RF device or cavity.
    Type: Grant
    Filed: July 30, 2019
    Date of Patent: July 12, 2022
    Assignee: THE ROYAL INSTITUTION FOR THE ADVANCEMENT OF LEARNING/MCGILL UNIVERSITY
    Inventors: Martin Otto, Bradley Siwick
  • Patent number: 11374380
    Abstract: Provided is a semiconductor laser including: a core layer having an active layer and a diffraction grating layer optically coupled to the active layer; and paired clad layers arranged sandwiching the core layer, and formed with a waveguide along the core layer, and the semiconductor laser includes: a flat layer provided continuously with the diffraction grating layer along the waveguide; and a temperature control mechanism for controlling the temperature of the flat layer to a temperature different from that of the diffraction grating layer.
    Type: Grant
    Filed: September 14, 2018
    Date of Patent: June 28, 2022
    Assignee: HORIBA, Ltd.
    Inventors: Tomoji Terakado, Makoto Matsuhama, Kyoji Shibuya
  • Patent number: 11320587
    Abstract: Aspects of the present disclosure describe planar lightwave circuit systems, methods and structures including a resonant mirror assembly having cascaded resonators that provide or otherwise facilitate the control of the transmissivity/reflectivity of a planar lightwave circuit (PLC)—or portion thereof—over a range of 0% to substantially 100%.
    Type: Grant
    Filed: July 1, 2019
    Date of Patent: May 3, 2022
    Assignee: LioniX International BV
    Inventors: Ruud Michiel Oldenbeuving, Chris Gerardus Hermanus Roeloffzen, Roelof Bernardus Timens, Jörn Philipp Epping, Ilka Dove, Dimitri Geskus
  • Patent number: 11305352
    Abstract: Methods, architectures, mechanisms and/or apparatus configured to manufacture a component (and components manufactured thereby) by optimizing a location of an internal feature of the component to be manufactured using powder fusion additive manufacturing (PFAM) based on an energy release rate being proportional to the third derivative of a component shape function and the shape function itself; the internal feature comprising one or more cavities having unfused powder disposed therein to provide vibration dampening.
    Type: Grant
    Filed: March 13, 2019
    Date of Patent: April 19, 2022
    Assignee: United States of America as represented by the Secretary of the Air Force
    Inventors: Onome Scott-Emuakpor, Tommy George, Brian Runyon
  • Patent number: 11303088
    Abstract: An optical frequency manipulation using an optical subsystem configured to provide a modulated laser beam for interaction with an atomic sample. The optical system may include: an optical subsystem for producing a light beam, the optical subsystem having a laser source and an IQ modulator, wherein the IQ modulator is operable to modulate light from the laser source at a carrier frequency to produce modulated light having a single sideband at a sideband frequency; and a chamber for containing an atomic sample, wherein the optical subsystem is arranged to direct the light beam towards the chamber to interact with an atomic sample contained therein.
    Type: Grant
    Filed: July 27, 2018
    Date of Patent: April 12, 2022
    Assignee: THE UNIVERSITY OF BIRMINGHAM
    Inventors: Yu-Hung Lien, Michael Holynski, Lingxiao Zhu, Kai Bongs
  • Patent number: 11294256
    Abstract: A method and a system for controlling an optical frequency comb, where the working power of the pump source is dynamically adjusted and controlled, which not only greatly shortens a control time of a stable mode-locking and realizes a fast mode-locking control, but also quickly stabilizes the power control of stable working condition, thereby reducing unnecessary power consumption caused by power reciprocating oscillation tracking controls and better achieving the energy-saving effect of the power adjustment control process. The temperature of the working environment of the pump source is dynamically adjusted and controlled, so that the environment temperature can quickly reach the reference environment temperature required for mode-locking, which not only creates a good temperature condition for the mode-locking of the optical comb system, but also improves the efficiency of environment temperature stability control in the stable working conditions.
    Type: Grant
    Filed: February 7, 2021
    Date of Patent: April 5, 2022
    Assignees: Chongqing Institute of East China Normal University, SHANGHAI LANGYAN OPTOELECTRONICS TECHNOLOGY CO., LTD., East China Normal University
    Inventors: Heping Zeng, Shuang Li, Xuling Shen
  • Patent number: 11281070
    Abstract: A device for high-speed real-time sampling of mid-infrared ultrafast light signals includes a time domain amplification unit and a detection unit. The time domain amplification unit is used to perform sampling and time domain amplification on signal light incident to the time domain amplification unit, and convert the signal light of a mid-infrared band into a near-infrared/visible band. The detection unit is used to receive and record information of the to-be-detected signal light processed by the time domain amplification unit to realize high-speed real-time sampling and measurement of the mid-infrared ultrafast light signal. The present disclosure can accurately obtain subpicosecond transient characteristics of the light signal, breaks through the capacity limit to the response rate of a traditional photoelectric detector, the bandwidth of the oscilloscope and the like, and is applicable to femtosecond-level mid-infrared ultrafast light signals.
    Type: Grant
    Filed: December 2, 2019
    Date of Patent: March 22, 2022
    Assignee: Xi'an Institute of Optics and Precision Mechanics of CAS
    Inventors: Qibing Sun, Leiran Wang, Wenfu Zhang, Aihu Zheng, Chao Zeng, Wei Zhao
  • Patent number: 11264779
    Abstract: The optical module includes: a housing having first and second end walls and a pair of side walls; a semiconductor laser element; a first TEC; a wavelength locker unit including an optical splitting component and an etalon filter; and a second TEC. The second end wall is provided with a feedthrough. The pair of side walls is not provided with an external connection terminal. The second TEC is disposed between the first TEC and the second end wall and has: a first substrate thermally coupled to a bottom surface of the housing; a second substrate thermally coupled to the etalon filter; and a heat transfer part that transfers heat. The optical module further includes a wiring pattern that is arranged side by side with the heat transfer part and that supplies electric power to the first TEC from the feedthrough.
    Type: Grant
    Filed: December 7, 2018
    Date of Patent: March 1, 2022
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Taichi Misawa, Tomoya Saeki
  • Patent number: 11237060
    Abstract: The invention relates to an optoelectronic chip comprising the following elements: a light inlet; a wavelength-sensitive optical filter; a first photoelectric element for measuring a first light intensity, particularly a first photodiode, the first photoelectric element being arranged such that light penetrating the optoelectronic chip via the light inlet, transmitted by the filter, hits the first photoelectric element; and a second photoelectric element for measuring a second light intensity, particularly a second photodiode, the second photoelectric element being arranged such that the light penetrating the optoelectronic chip via the light inlet, which is reflected by the filter, hits the second photoelectric element.
    Type: Grant
    Filed: August 10, 2018
    Date of Patent: February 1, 2022
    Assignee: FOS4X GMBH
    Inventor: Markus Schmid
  • Patent number: 11231642
    Abstract: A light source module, a projector using the same and a light source control method are disclosed. The light source module includes a laser light source, a temperature sensor, a light source driver and a controller. The temperature sensor is adjacent to the light source and configured to sense a light source temperature of the laser light source. The controller is configured to: (1) determine whether the light source temperature reaches a first temperature value; (2) if yes, control the light source driver to drive the laser light source to illuminate by a first current; (3) determine whether the light source temperature changes from the first temperature value to a second temperature value different from the first temperature value; and, (4) if yes, control the light source driver to drive the laser light source to illuminate by a second current different from the first current.
    Type: Grant
    Filed: October 8, 2020
    Date of Patent: January 25, 2022
    Assignee: Qisda Corporation
    Inventors: Chien-Hung Lin, Tzu-Huan Hsu
  • Patent number: 11231278
    Abstract: An optical system includes at least one laser source configured to generate first light having a first spectrum comprising a plurality of first peaks, a waveform generator configured to produce a noise waveform, and an electro-optic phase modulator in optical communication with the at least one laser source and in electrical communication with the waveform generator. The electro-optic phase modulator is configured to receive the first light, to receive the noise waveform, and to respond to the noise waveform by modulating the first light to produce second light having a second spectrum comprising a plurality of second peaks. The peak wavelengths of the second peaks are equal to the peak wavelengths of the first peaks and the linewidths of the second peaks are broader than the linewidths of the corresponding first peaks.
    Type: Grant
    Filed: October 15, 2020
    Date of Patent: January 25, 2022
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventors: Michel J. F. Digonnet, Jonathan M. Wheeler
  • Patent number: 11199754
    Abstract: A demodulator can include an optical resonator. The optical resonator can include a resonant cavity that extends between a first surface that is partially reflective and a second surface that is at least partially reflective. The first surface can receive a phase-modulated optical signal that has a time-varying phase. The resonant cavity can accumulate resonant optical signal energy based at least in part on the phase-modulated optical signal. The first surface can direct a fraction of the resonant optical signal energy out of the optical resonator to form an intensity-modulated optical signal that has a time-varying intensity. A data detector can receive at least a portion of the intensity-modulated optical signal and, in response, generate an intensity-modulated electrical signal that has a time-varying intensity that corresponds to the time-varying phase of the phase-modulated optical signal.
    Type: Grant
    Filed: June 16, 2020
    Date of Patent: December 14, 2021
    Assignee: Raytheon Company
    Inventors: Andrew M. Kowalevicz, Benjamin P. Dolgin, Gary M. Graceffo
  • Patent number: 11181374
    Abstract: A resonator fiber optic gyroscope (RFOG) that includes at least one laser, a resonator and a resonator hopping control system is provided. The resonator is in operational communication with the at least one laser to receive a clockwise (CW) laser light and counterclockwise (CCW) laser light produced by the at least one laser. The resonance hopping control system is in communication with an output of the resonator and the at least one laser. The resonance hopping control system is configured to control an output of the at least one laser to periodically unlock, hop and lock frequencies of the laser light traveling in the CW and CCW directions in the resonator to resonance frequencies of the resonator to mitigate bias errors due to resonance asymmetries.
    Type: Grant
    Filed: February 24, 2020
    Date of Patent: November 23, 2021
    Assignee: Honeywell International Inc.
    Inventors: Marc Smiciklas, Glen A. Sanders, Lee K. Strandjord
  • Patent number: 11143819
    Abstract: An optical filter assembly comprising: a tuneable optical filter; a beam splitter assembly configured to split an input beam into an output beam, a reference beam, and a probe beam, and to direct the output beam and the probe beam through the tuneable optical filter, such that the probe beam is at an angle ? to the output beam; a first detector configured to measure the intensity S0 of the reference beam; a second detector configured to measure the intensity S1 of the probe beam after it has passed through the filter; a controller configured to adjust the tuneable optical filter on the basis of the measured intensities of the reference and probe beams.
    Type: Grant
    Filed: January 30, 2019
    Date of Patent: October 12, 2021
    Assignee: Lumentum Technology UK Limited
    Inventor: Adrian Perrin Janssen
  • Patent number: 11095095
    Abstract: External cavity diode laser (ECDL) devices and methods for producing the same are described that allows ECDLs to be readily produced and configured to operate at a desired range of wavelengths, while allowing tunability of the output wavelength. One ECDL includes a laser gain chip including a gain medium, a first reflective surface at a first end of the gain medium, and a second surface at a second end of the gain medium opposite to the first reflective surface. The second surface has a facet that forms an angle approximately equal to Brewster's angle for light having a first wavelength. The ECDL further includes a diffraction grating positioned to receive light that passes through the second surface, to operate as a mirror in the external cavity diode laser, and to allow a portion of the light to be directed outside of the external cavity diode laser as output light.
    Type: Grant
    Filed: August 27, 2019
    Date of Patent: August 17, 2021
    Assignee: ARIZONA BOARD OF REGENTS ON BEHALF OF THE UNIVERSITY OF ARIZONA
    Inventor: Yushi Kaneda
  • Patent number: 11092426
    Abstract: Optical coherence tomography (OCT) probe and system designs are disclosed that minimize the effects of mechanical movement and strain to the probe to the OCT analysis. It also concerns optical designs that are robust against noise from the OCT laser source. Also integrated OCT system-probes are included that yield compact and robust electro-opto-mechanical systems along with polarization sensitive OCT systems.
    Type: Grant
    Filed: September 25, 2017
    Date of Patent: August 17, 2021
    Assignee: Excelitas Technologies Corp.
    Inventors: Bartley C. Johnson, Dale C. Flanders
  • Patent number: 11085831
    Abstract: A high-resolution real-time time-frequency domain measuring device includes a light splitting unit used to split signal light to be measured, a time lens unit used to perform time domain amplification on the signal light to be measured, a dispersion Fourier transform unit used to perform Fourier transform on the signal light to be measured, and a detection unit used to receive and detect measured data. The time lens and the dispersion Fourier transform technology are used to realize the real-time measurement of sub-picosecond transient characteristics of the ultra-short pulse to accurately obtain the time-frequency domain information of the ultra-short pulse.
    Type: Grant
    Filed: September 19, 2019
    Date of Patent: August 10, 2021
    Assignee: XI'AN INSTITUTE OF OPTICS AND PRECISION MECHANICS OF CAS
    Inventors: Qibing Sun, Chao Zeng, Leiran Wang, Wenfu Zhang, Wei Zhao
  • Patent number: 11079323
    Abstract: A method of generating frequency combs composed of a predetermined number of rays, wherein the method includes the modulation of a main ray generated by a laser source (20), by a first radiofrequency signal at a first frequency value, by a second radio frequency signal at a second frequency value, and by a third radio frequency signal at a third frequency value. The second frequency value is equal to twice the first frequency value. The third frequency value is equal to three times the first frequency value.
    Type: Grant
    Filed: May 22, 2018
    Date of Patent: August 3, 2021
    Assignees: CENTRE NATIONAL D'ETUDES SPATIALES, OFFICE NATIONAL D'ETUDES ET DE RECHERCHES AEROSPATIALES
    Inventors: Philippe Hébert, François Lemaître, Xavier Orlik, Thibault Dartigalongue
  • Patent number: 11050211
    Abstract: A pulsed laser device includes a laser light source, an electro-optic modulator, a laser light source driver, an electro-optic modulator driver, and a controller to control the laser light source driver and the electro-optic modulator driver. The laser light source outputs pulsed laser light pulse-modulated by the laser light source driver. The electro-optic modulator outputs pulsed laser light obtained by causing the electro-optic modulator driver to pulse-modulate the pulsed laser light from the laser light source. The control unit controls the laser light source driver and the electro-optic modulator driver such that the electro-optic modulator turns on at least while the laser light source is on and the electro-optic modulator turns on at least once while the laser light source is off, thereby increasing a duty ratio of the pulse modulation for the electro-optic modulator relative to a duty ratio of the pulse modulation for the laser light source.
    Type: Grant
    Filed: June 6, 2019
    Date of Patent: June 29, 2021
    Assignee: FURUKAWA ELECTRIC CO., LTD.
    Inventors: Ryo Kawahara, Shunichi Matsushita
  • Patent number: 11043788
    Abstract: The present disclosure provides a dark cavity laser, including: a frequency stabilized laser output device configured to generate a laser light, and perform a frequency stabilized processing on the generated laser light to output it to the dark cavity laser device as a pump light of a gain medium of a dark cavity; and a dark cavity laser device including a main cavity, and a cavity of the main cavity is provided inside with a gas chamber of a gain medium of a dark cavity laser light, where the gain medium of the dark cavity laser light is alkali metal atoms; the dark cavity laser device is configured to receive the pump light, and form a polyatomic coherent stimulated radiation between transition levels of the alkali metal atoms in the gas chamber by a weak feedback of the main cavity to generate the dark cavity laser light.
    Type: Grant
    Filed: September 23, 2019
    Date of Patent: June 22, 2021
    Assignee: WENZHOU COLLABORATIVE INNOVATION CENTER OF LASER AND OPTOELECTRONICS
    Inventors: Jingbiao Chen, Tiantian Shi
  • Patent number: 11018470
    Abstract: A system for producing single-frequency or near-single-frequency operation of a laser beam includes a laser for emitting a laser beam at each one of a plurality of cavity lengths, A detector is configured to receive at least a portion of the laser beam emitted, and generate a signal. A computer system is configured to identify at least one beat note in the signal for each of at least one of the plurality of cavity lengths, the at least one beat note indicating the presence of one or more higher-order transverse modes, longitudinal modes, or both, in the received at least the portion of the laser beam emitted at the at least one of the plurality of cavity lengths. The cavity is adjusted to one of the plurality of cavity lengths for eliminating or minimizing the at least one beat note.
    Type: Grant
    Filed: March 9, 2020
    Date of Patent: May 25, 2021
    Assignee: Picomole Inc.
    Inventors: Chris Purves, Jean-François Bisson, Gisia Beydaghyan
  • Patent number: 10980100
    Abstract: A system includes a laser source operable to provide a laser beam, a laser amplifier having a gain medium operable to provide energy to the laser beam when the laser beam passes through the laser amplifier, and a residual gain monitor operable to provide a probe beam and operable to derive a residual gain of the laser amplifier from the probe beam when the probe beam passes through the laser amplifier while being offset from the laser beam in time or in path.
    Type: Grant
    Filed: December 20, 2019
    Date of Patent: April 13, 2021
    Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING CO., LTD.
    Inventors: Chun-Lin Louis Chang, Jen-Hao Yeh, Han-Lung Chang, Tzung-Chi Fu, Bo-Tsun Liu, Li-Jui Chen, Po-Chung Cheng
  • Patent number: 10890484
    Abstract: A wavelength measuring device configured to detect a wavelength of ultraviolet laser light outputted from a laser resonator with at least one etalon, the wavelength measuring device includes: a first housing having an interior space being sealed and accommodating the etalon, an input window through which the ultraviolet laser light enters to the first housing, the input window being provided at a first opening of the first housing, a first sealing member configured to seal a gap between a rim part of the input window and a circumferential portion of the first opening, a shielding film provided between the rim part of the input window and the first sealing member and configured to shield the first sealing member from the ultraviolet laser light coming from the input window, and a diffusing element provided outside of the first housing and configured to diffuse the ultraviolet laser light before being incident on the input window.
    Type: Grant
    Filed: October 3, 2018
    Date of Patent: January 12, 2021
    Assignee: Gigaphoton Inc.
    Inventor: Masato Moriya
  • Patent number: 10862272
    Abstract: A gallium- and nitrogen-containing laser device including an etched facet with surface treatment to improve an optical beam is disclosed.
    Type: Grant
    Filed: December 16, 2019
    Date of Patent: December 8, 2020
    Assignee: Soraa Laser Diode, Inc.
    Inventors: James W. Raring, Mathew C. Schmidt, Bryan Ellis
  • Patent number: 10756514
    Abstract: An oscillator system includes a laser source; a high-Q electro-optical oscillator to generate a high-Q electro-optical oscillator signals having oscillator frequencies; and an environment-insensitive resonator including ENZ metamaterials. The resonator receives a laser from the laser source and generate a feedback signal to lock the oscillator to reduce a phase/frequency noise in the oscillator. An optical system also includes a high-Q electro-optical oscillator to generate a high-Q electro-optical oscillator signal having oscillator frequencies; an environment insensitive signal delay waveguide having an EMNZ metamaterial such that the signal delay waveguide delays the high-Q electro-optical oscillator signal and generates a delayed signal; and a phase-lock circuit to receive the delayed signal from the signal delay waveguide and provide an electrical feedback signal to the oscillator.
    Type: Grant
    Filed: July 2, 2019
    Date of Patent: August 25, 2020
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Weimin Zhou
  • Patent number: 10670786
    Abstract: An electronic device may be provided with a color ambient light sensor. The color ambient light sensor may be used to measure an ambient light spectrum over a wavelength range of interest. Control circuitry in the electronic device can take actions based on the measured ambient light spectrum such as adjusting the brightness and color cast of content on a display. A display may have a display cover layer. The color ambient light sensor can be mounted under the display cover layer and may receive ambient light through the display cover layer. The color ambient light sensor may have a tunable wavelength filter such as an electrically adjustable Fabry-Perot resonator. A light collimator may be interposed between the display cover layer and the Fabry-Perot resonator to collimate ambient light that is passed to the Fabry-Perot resonator. A light detector measures the light passing through the Fabry-Perot resonator.
    Type: Grant
    Filed: April 13, 2018
    Date of Patent: June 2, 2020
    Assignee: Apple Inc.
    Inventors: Dong Zheng, Ove Lyngnes, Prashanth S. Holenarsipur, Serhan O. Isikman, Tianbo Sun, Tingjun Xu, Xianwei Zhao, Xingxing Cai
  • Patent number: 10666012
    Abstract: A method and system for obtaining single-frequency operation of a laser system. A laser beam is emitted from a laser cavity, having an adjustable length, at a plurality of cavity lengths. At least a portion of the laser beam is received at a detector, which detects the presence of transverse and/or longitudinal modes in the laser beam, and generates a laser beam signal having a beat-note indicative thereof. The laser beam signal for each of the plurality of cavity lengths can be analyzed, and a cavity length of best mode purity, indicating single-frequency operation, can be selected. The laser beam system can emit a laser and have a laser beam splitter for directing at least a portion of the emitted laser beam to a laser beam detector for generating at least one laser beam signal therefrom, and an actuator for adjusting the length of the laser cavity.
    Type: Grant
    Filed: March 13, 2018
    Date of Patent: May 26, 2020
    Assignee: PICOMOLE INC.
    Inventors: Chris Purves, Jean-François Bisson, Gisia Beydaghyan
  • Patent number: 10637581
    Abstract: An optical channel monitor (OCM) may include a modulator to provide a modulation signal and a local oscillator (LO) to provide a modulated LO signal. The modulated LO signal may be created by modulating an LO signal based on the modulation signal. The OCM may include a mixer to generate a pair of mixed optical signals. The pair of mixed optical signals may be generated based on mixing the modulated LO signal and an input optical signal. The OCM may include an optical detector to provide, based on the pair of mixed optical signals, a first electrical signal corresponding to a coherent mixture of the input optical signal and the modulated LO signal. The OCM may include a synchronous demodulator to provide, based on the first electrical signal and the modulation signal, a second electrical signal representative of the optical power spectrum of the input optical signal.
    Type: Grant
    Filed: March 12, 2019
    Date of Patent: April 28, 2020
    Assignee: Lumentum Operations LLC
    Inventors: Shane H. Woodside, Jiamin Zheng
  • Patent number: 10574028
    Abstract: The present disclosure provides a unique digitally integrated, self-trained pre-distortion curve generation method and apparatus for semiconductor lasers (SCLs) to generate linearly swept optical signals that are applicable to a wide range of sweep velocities and semiconductor laser types. The method requires no prior knowledge of the frequency response of the laser and is highly accurate.
    Type: Grant
    Filed: February 26, 2019
    Date of Patent: February 25, 2020
    Assignee: Rhode Island Council on Postsecondary Education
    Inventors: Tao Wei, Zheyi Yao, Yan Sun
  • Patent number: 10566013
    Abstract: A light source unit for thermally-assisted magnetic head includes a substrate member having a bonding surface, multiple layers formed on the bonding surface and comprising a base layer, a connection pad layer, an insulation layer and a bonding layer; a light source assembly attached on the bonding layer of the substrate member and having a laser diode embedded therein and connected to the connection pad layer on the bonding surface, so as to form a laser diode circuit; and a heater buried in the insulation layer and connected to the connection pad layer, so as to form a heater circuit. The light source unit can maintain stable heat power for facilitating performance of the thermally-assisted magnetic head, and further reduce the sizes of the light source unit and substrate member.
    Type: Grant
    Filed: January 17, 2019
    Date of Patent: February 18, 2020
    Assignees: SAE MAGNETICS (H.K.) LTD., HEADWAY TECHNOLOGIES, INC.
    Inventors: Takashi Honda, Ryo Hosoi, Wah Chun Chan, Makoto Kawato, Dayu Zhou, Koji Shimazawa, Kowang Liu
  • Patent number: 10554011
    Abstract: A light source device according to the present disclosure that is provided with a semiconductor laser unit configured to emit excitation light of a prescribed wavelength, a wavelength conversion unit configured to amplify the excitation light by causing the excitation light to resonate and generate output light of a different wavelength from the excitation light using a prescribed non-linear crystal, the wavelength conversion unit including a first optical path for amplifying the excitation light, and a second optical path for generating the output light, a first servo mechanism configured to control an optical path length of the first optical path, and a second servo mechanism configured to control an optical path length of the second optical path.
    Type: Grant
    Filed: November 17, 2014
    Date of Patent: February 4, 2020
    Assignee: SONY CORPORATION
    Inventors: Kenji Tanaka, Goro Fujita
  • Patent number: 10530116
    Abstract: A laser device includes an excitation light source, a resonator which receives excitation light from the excitation light source and generates laser light, an absorption cell to which the laser light is emitted, a light converter which converts the laser light passing through the absorption cell to a light output signal, a third order differential lock-in amplifier which generates a third order differential signal of the light output signal, and a controller. When a predetermined waveform of the third order differential signal is detected, the controller includes a return controller that determines a return direction of a resonator length based on the predetermined waveform and a resonator length controller that changes the resonator length to the return direction.
    Type: Grant
    Filed: October 29, 2018
    Date of Patent: January 7, 2020
    Assignee: MITUTOYO CORPORATION
    Inventor: Yusuke Shirakawa
  • Patent number: 10524345
    Abstract: A laser system includes a laser source operable to provide a laser beam; a laser amplifier having an input port and an output port and operable to amplify the laser beam, the laser beam travelling along a main beam path through the laser amplifier from the input port to the output port; and a residual gain monitor operable to provide a probe laser beam, the probe laser beam travelling along a probe beam path through the laser amplifier from the output port to the input port, wherein the residual gain monitor calculates a residual gain of the laser amplifier according to the probe laser beam.
    Type: Grant
    Filed: April 5, 2018
    Date of Patent: December 31, 2019
    Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING CO., LTD.
    Inventors: Chun-Lin Louis Chang, Jen-Hao Yeh, Han-Lung Chang, Tzung-Chi Fu, Bo-Tsun Liu, Li-Jui Chen, Po-Chung Cheng
  • Patent number: 10516470
    Abstract: A method may comprise relaying a wireless signal via a bi-directional, full-duplex relay. The relay may comprise an analog uplink relay and an analog downlink relay, and may relay signals between a transmitter and a backscatter node. The spectrum of the downlink signal transmitted by the downlink relay may be different than the spectrum of the uplink signal received by the uplink relay. Filtering may attenuate leakage from the downlink relay to the uplink relay, and vice versa. The uplink relay may create a phase offset that is opposite in sign and substantially equal in magnitude to the phase offset created by the downlink relay. The downlink and uplink relays, taken together, may create a substantially constant net phase offset. The full-duplex relay may be housed in a vehicle that moves, and may be used to determine spatial coordinates of backscatter sources that are located in the relay's environment.
    Type: Grant
    Filed: July 3, 2019
    Date of Patent: December 24, 2019
    Assignee: Massachusetts Institute of Technology
    Inventors: Yunfei Ma, Nicholas Selby, Fadel Adib
  • Patent number: 10459013
    Abstract: An apparatus is provided that can estimate a transfer function, for example of current measurement systems, voltage measurement systems and power measurement systems, and also provide an estimate of certainty about the transfer function. This enables customers to have confidence that they are not being overcharged for electricity.
    Type: Grant
    Filed: June 17, 2016
    Date of Patent: October 29, 2019
    Assignee: Analog Devices Global
    Inventors: Jonathan Ephraim David Hurwitz, Seyed Amir Ali Danesh, William Michael James Holland, John Stuart
  • Patent number: 10453370
    Abstract: A control apparatus is used in a display apparatus. The control apparatus includes a laser element; a temperature sensor configured to detect a temperature of the laser element; a laser driver configured to drive the laser element; and a laser control unit configured to control a driving current to be supplied to the laser element by the laser driver, such that an optical output value of the laser element converges to a target optical output value. The laser control unit determines an initial driving current value that causes an initial optical output value to be output from the laser element, based on temperature characteristic data of the initial driving current value, and a detection temperature of the laser element detected by the temperature sensor, and controls the driving current to start from the determined initial driving current value.
    Type: Grant
    Filed: April 23, 2019
    Date of Patent: October 22, 2019
    Assignee: MITSUMI ELECTRIC CO., LTD.
    Inventors: Etsuji Hayakawa, Toyoki Tanaka
  • Patent number: 10389429
    Abstract: A full-duplex analog relay may comprise an analog uplink relay and an analog downlink relay, and may relay signals between a transmitter and a backscatter node. The spectrum of the downlink signal transmitted by the downlink relay may be different than the spectrum of the uplink signal received by the uplink relay. Filtering may attenuate leakage from the downlink relay to the uplink relay, and vice versa. The uplink relay may create a phase offset that is opposite in sign and substantially equal in magnitude to the phase offset created by the downlink relay. The downlink and uplink relays, taken together, may created a substantially constant net phase offset. The full-duplex relay may be housed in a vehicle that moves, and may be used to determine spatial coordinates of backscatter sources that are located in the relay's environment.
    Type: Grant
    Filed: February 12, 2018
    Date of Patent: August 20, 2019
    Assignee: Massachusetts Institute of Technology
    Inventors: Yunfei Ma, Nicholas Selby, Fadel Adib
  • Patent number: 10281747
    Abstract: A low-cost, robust method for automatically tuning a coupled resonator to match a wavelength of electromagnetic radiation emitted from an applied laser source. Dithering signals are used for automatic wavelength tuning and thermal stabilization of microring resonators. The disclosed method can be applied using low-speed analog and digital circuitry, to create a complete photonic interconnection network. The methods disclosed also automatically detect, measure, and correct for resonance shift.
    Type: Grant
    Filed: July 16, 2015
    Date of Patent: May 7, 2019
    Assignee: THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORK
    Inventors: Kishore Padmaraju, Keren Bergman
  • Patent number: 10256934
    Abstract: A technique for optical signal transmission includes generating a plurality of double sideband modulated optical signals by modulating a plurality of source data signals using a plurality of direct modulation laser (DML) optical sources, wherein the plurality of double sideband modulated optical signals occupy non-overlapping neighboring optical frequency bands, generating a chirp-managed laser (CML) output signal by multiplexing the plurality of double sideband modulated optical signals using a wavelength-selective multiplexer, and transmitting the CML output signal over an optical transport medium.
    Type: Grant
    Filed: October 10, 2017
    Date of Patent: April 9, 2019
    Assignee: ZTE Corporation
    Inventors: Jianjun Yu, Hung-Chang Chien
  • Patent number: 10251234
    Abstract: A thermal management system for an object comprising: one or more thermoelectric elements, one or more light emitting sources, electricity transport medium; electrical energy storage, and a controller. Heat energy that is generated or absorbed by the object is converted by said thermoelectric element to electrical energy. This energy is transferred to light emitting source to emit the energy to the environment or delivered to the electrical energy storage or back to the thermoelectric elements using the electricity transport medium and the controller to achieve the thermal goal of the thermal management system.
    Type: Grant
    Filed: June 24, 2016
    Date of Patent: April 2, 2019
    Inventor: David Hirshberg
  • Patent number: 10132747
    Abstract: An absorption spectrometer which measures a gas component concentration in a measured gas and which operates via wavelength modulation spectroscopy, wherein the light wavelength of a wavelength-tunable light source is periodically varied over a gas component absorption line of interest and simultaneously sinusoidally modulated with a high frequency and a low amplitude signal, and wherein the measurement signal of a detector is demodulated in a phase-sensitive manner at the frequency and/or a harmonic of the frequency and further analyzed, where modulation starts in each period or each n-th period with the frequency in a time interval before the beginning of the time function and is performed with a higher amplitude than during the time function to demodulate the measurement signal in a phase-synchronous manner, where a device provided for the phase-sensitive demodulation is synchronized during the time interval such that a cable for transmitting synchronization signals is no longer necessary.
    Type: Grant
    Filed: December 2, 2015
    Date of Patent: November 20, 2018
    Assignee: Siemens Aktiengesellschaft
    Inventor: Franz Steinbacher
  • Patent number: 10122144
    Abstract: Provided is a solar-pumped fiber laser device that includes: a first layer of a light guiding material or a fluorescent material having a circular or an elliptical planar contour with an even thickness; and an optical fiber wound around a peripheral thickness edge of the first layer, wherein the optical fiber is irradiated with light formed of solar light having entered a flat surface of the planar contour of the first layer, the solar light being scattered by the light guiding material, or with fluorescence generated by applying the solar light having entered the flat surface of the planar contour of the first layer to the fluorescent material.
    Type: Grant
    Filed: November 15, 2017
    Date of Patent: November 6, 2018
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventor: Taizo Masuda
  • Patent number: 10096967
    Abstract: Wafer positioning errors in stepper-scanners contribute to imaging defects. Changing the wavelength of the light source's generated light can compensate for wafer positional errors in the Z-direction. The wafer's real-time z-position is determined and a change in wavelength target to offset this error is communicated to the light source. The light source uses this change in wavelength target in a feed-forward operation and, in an embodiment, in combination with existing feedback operations, on a pulse-by-pulse basis for subsequent pulses in a current burst of pulses in addition to receiving the newly-specified laser wavelength target for a subsequent burst of laser pulses.
    Type: Grant
    Filed: December 7, 2016
    Date of Patent: October 9, 2018
    Assignee: Cymer, LLC
    Inventors: Rahul Ahlawat, Thomas P. Duffey
  • Patent number: 10067405
    Abstract: An optoelectronic component for generating and radiating an electromagnetic signal exhibiting a frequency lying between 30 GHz and 10 THz referred to as a microwave frequency, comprises: a planar guide configured to confine and propagate freely in a plane XY a first and a second optical wave exhibiting an optical frequency difference, referred to as a heterodyne beat, equal to the microwave frequency, a system for injecting the optical waves into the planar guide, a photo-mixer coupled to the planar guide to generate, on the basis of the first optical wave and of the second optical wave, a signal exhibiting the microwave frequency, the photo-mixer having an elongated shape exhibiting along an axis Y a large dimension greater than or equal to half the wavelength of the signal, the injection system configured so that the optical waves overlap in the planar guide and are coupled with the photo-mixer over a length along the axis Y at least equal to half the wavelength of the signal, the photo-mixer thus being abl
    Type: Grant
    Filed: December 11, 2015
    Date of Patent: September 4, 2018
    Assignees: THALES, ALCATEL LUCENT
    Inventor: Frédéric Van Dijk
  • Patent number: 9983132
    Abstract: Apparatus and methods for fluorescence imaging using radiofrequency multiplexed excitation. One apparatus splits an excitation laser beam into two arms of a Mach-Zehnder interferometer. The light in the first beam is frequency shifted by an acousto-optic deflector, which is driven by a phase-engineered radiofrequency comb designed to minimize peak-to-average power ratio. This RF comb generates multiple deflected optical beams possessing a range of output angles and frequency shifts. The second beam is shifted in frequency using an acousto-optic frequency shifter. After combining at a second beam splitter, the two beams are focused to a line on the sample using a conventional laser scanning microscope lens system. The acousto-optic deflectors frequency-encode the simultaneous excitation of an entire row of pixels, which enables detection and de-multiplexing of fluorescence images using a single photomultiplier tube and digital phase-coherent signal recovery techniques.
    Type: Grant
    Filed: July 27, 2016
    Date of Patent: May 29, 2018
    Assignee: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
    Inventors: Eric D. Diebold, Bahram Jalali, Brandon Buckley
  • Patent number: 9979501
    Abstract: Frequency independent isolation of duplexed ports in distributed antenna systems (DASs) is disclosed. Instead of providing a duplexer in a DAS that provides frequency dependent separation between downlink and uplink communications signals, an isolation circuit is provided. The isolation circuit is coupled to a duplexed port that provides downlink communications signals to the DAS and receives uplink communications signals from the DAS. To isolate uplink communications signals from the downlink communications path, the isolation circuit includes a directional coupler. The directional coupler provides frequency independent isolation between uplink communications signals and a downlink communications path in the DAS. Further, to isolate downlink communications signals from the uplink communications path, the isolation circuit includes at least one circulator isolator.
    Type: Grant
    Filed: April 18, 2016
    Date of Patent: May 22, 2018
    Assignee: Corning Optical Communications Wireless Ltd
    Inventors: Yury Abramov, Motti Vahedy
  • Patent number: 9971090
    Abstract: A laser source or a plurality of laser sources in a photonic integrated circuit (PIC) are provided with an electrical contact that is either segmented or is connected to a series of vernier resistor segments for supply of current to operate the laser source. In either case, at least one segment of the laser contact or at least one vernier resistor segment can be trimmed in order to vary the amount of current supplied to the laser source resulting in a change to its current density and, thus, a change in its operational wavelength while maintaining the current supplied to the laser source constant.
    Type: Grant
    Filed: August 11, 2004
    Date of Patent: May 15, 2018
    Assignee: Infinera Corporation
    Inventors: Fred A. Kish, Jr., Charles H. Joyner, David F. Welch
  • Patent number: 9941668
    Abstract: In various embodiments, wavelength beam combining laser systems incorporate etalons to establish external lasing cavities and/or to combine multiple input beams into a single output beam.
    Type: Grant
    Filed: November 11, 2016
    Date of Patent: April 10, 2018
    Assignee: TERADIODE, INC.
    Inventors: Bien Chann, James Burgess, Wang Zhou, Bryan Lochman, Francisco Villarreal-Saucedo