Tuning Patents (Class 372/20)
  • Patent number: 10992107
    Abstract: The present disclosure discloses a narrow-linewidth laser. The narrow-linewidth laser comprises a passive ring waveguide, a first passive input/output waveguide which is coupled with the passive ring waveguide, a gain wavelength-selection unit which is used for providing gain for the whole laser and is configured to be capable of selecting the light with a specific wavelength to be coupled into the passive ring waveguide, and a second passive input/output waveguide which is coupled with the passive ring waveguide in order to output lasing light from the laser. The narrow-linewidth semiconductor laser provided by the present disclosure has a simple structure and does not have butt-joint coupling loss between a gain region and a waveguide external cavity region. There is no a linewidth limitation caused by butt-coupling loss in such semiconductor lasers.
    Type: Grant
    Filed: November 14, 2017
    Date of Patent: April 27, 2021
    Assignee: Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences
    Inventor: Ruiying Zhang
  • Patent number: 10944025
    Abstract: A light-emitting diode including: a first n-doped semiconductor layer configured to form a cathode, and a second p-doped semiconductor layer configured to form an anode, and together forming a p-n junction of the diode; an active zone located between the first layer and the second layer, including at least two emissive layers including a semiconductor capable of forming quantum wells, and a plurality of semiconductor barrier layers such that each emissive layer is located between two barrier layers; an n-doped semiconductor buffer layer located between the first layer and the active zone, the n-dope semiconductor of the buffer layer having a band gap energy less than or equal to about 97% of the band gap energy of the p-doped semiconductor of the second layer.
    Type: Grant
    Filed: March 25, 2014
    Date of Patent: March 9, 2021
    Assignee: Commissariat a l'energie atomique et aux energies alternatives
    Inventors: Ivan-Christophe Robin, Hubert Bono
  • Patent number: 10942417
    Abstract: A tunable comb generator may include a light source to generate an optical signal, an intensity modulator to modulate an intensity of the optical signal from the light source based on a RF drive signal, a frequency-locking loop (FLL) to maintain an optical frequency of the optical signal received from the intensity modulator at a target optical frequency corresponding to a resonance frequency of a periodic optical filter in the FLL, and an optoelectronic oscillator (OEO) loop. The OEO loop may include a photodetector to generate the RF drive signal based on the optical signal from the FLL, a tunable phase shifter to select a resonance frequency of the OEO loop corresponding to a harmonic of the resonance frequency of the periodic optical filter, and one or more phase modulators to generate an optical comb signal by modulating a portion of the optical signal from the FLL.
    Type: Grant
    Filed: February 21, 2020
    Date of Patent: March 9, 2021
    Assignee: University of Central Florida Research Foundation, Inc.
    Inventors: Michael Plascak, Ricardo Bustos Ramirez, Peter Delfyett
  • Patent number: 10935482
    Abstract: In one aspect, the present teachings provide a system for performing cytometry that can be operated in three operational modes. In one operational mode, a fluorescence image of a sample is obtained by exciting one or more fluorophore(s) present in the sample by an excitation beam formed as a superposition of a top-hat-shaped beam with a plurality of beams that are radiofrequency shifted relative to one another. In another operational mode, a sample can be illuminated successively over a time interval by a laser beam at a plurality of excitation frequencies in a scanning fashion. The fluorescence emission from the sample can be detected and analyzed, e.g., to generate a fluorescence image of the sample. In yet another operational mode, the system can be operated to illuminate a plurality of locations of a sample concurrently by a single excitation frequency, which can be generated, e.g., by shifting the central frequency of a laser beam by a radiofrequency.
    Type: Grant
    Filed: April 27, 2020
    Date of Patent: March 2, 2021
    Assignee: Becton, Dickinson and Company
    Inventors: Eric D. Diebold, Keegan Owsley, Jonathan Lin
  • Patent number: 10892593
    Abstract: A laser device for laser resonance ionization includes a wavelength variable grating-type titanium-doped sapphire laser and includes a titanium (Ti) doped titanium sapphire crystal disposed within a resonator. The titanium sapphire crystal is fixedly disposed on a stage. The titanium-doped sapphire crystal can be moved in the optical axis direction by the stage, thereby changing the position of the titanium-doped sapphire crystal. The switching between the wideband mode and the high-output mode can be performed by changing the position of the titanium-doped sapphire crystal.
    Type: Grant
    Filed: February 22, 2018
    Date of Patent: January 12, 2021
    Assignees: NATIONAL UNIVERSITY CORPORATION NAGOYA UNIVERSITY, KOGAKUIN UNIVERSITY
    Inventors: Hideki Tomita, Daiki Matsui, Tetsuo Sakamoto
  • Patent number: 10862267
    Abstract: A method for controlling the emission frequency of a laser comprises: recording a first spectrum by passing a laser light emitted by the laser through a sample onto a detector, the detector being connected to a multichannel analyzer which assigns pulses detected by the detector to a channel; determining a first channel to which the maximum of a first signal in the first spectrum has been assigned; determining a second channel to which the maximum of a second signal in the first spectrum has been assigned; recording a second spectrum in analog fashion like the first spectrum; determining whether the maximum of the first signal in the second spectrum has been assigned to the first channel and whether the maximum of the second signal in the second spectrum has been assigned to the second channel; adjusting the operating temperature of the laser in the event of deviations determined in the previous step.
    Type: Grant
    Filed: May 19, 2017
    Date of Patent: December 8, 2020
    Assignee: HUMEDICS GMBH
    Inventors: Axel Luchterhand, Alexander Helmke, Tom Rubin, Karsten Heyne
  • Patent number: 10861682
    Abstract: An apparatuses relating generally to a test wafer, processing chambers, and method relating generally to monitoring or calibrating a processing chamber, are described. In one such an apparatus for a test wafer, there is a platform. An optical fiber with Fiber Bragg Grating sensors is located over the platform. A layer of material is located over the platform and over the optical fiber.
    Type: Grant
    Filed: July 16, 2018
    Date of Patent: December 8, 2020
    Assignee: iSenseCloud, Inc.
    Inventors: William J. O'Banion, An-Dien Nguyen, Huy D. Nguyen
  • Patent number: 10859888
    Abstract: Disclosed is a system for generating short or ultra-short light pulses, including a light source configured to emit temporally continuous-wave light radiation, an electrical generator configured to operate at a tunable frequency in a passband included between 5 and 100 GHz and to emit an analogue modulating electrical signal including at least one electrical pulse of duration included between 10 ps and 100 ps, and an electro-optical modulator having electrodes and an electrical passband that are suitable for receiving the analog modulating electrical signal, the electro-optical modulator being configured to optically amplitude modulate the continuous-wave light radiation depending of the analog modulating electrical signal and to generate modulated light radiation including at least one light pulse of duration included between 10 ps and 100 ps.
    Type: Grant
    Filed: July 20, 2017
    Date of Patent: December 8, 2020
    Assignee: IRISIOME
    Inventors: Romain Royon, Romain Dubrasquet
  • Patent number: 10855379
    Abstract: A communication device includes a transmitter configured to generate a data signal, and a controller configured to stop an operation of the transmitter in response to an optical transmission stop instruction. The optical transmission stop instruction preferably has a predetermined bit pattern.
    Type: Grant
    Filed: April 12, 2016
    Date of Patent: December 1, 2020
    Assignee: Sony Corporation
    Inventors: Toshihisa Hyakudai, Masanari Yamamoto, Takeshi Ogura, Tsugita Komatsu, Hiroshi Morita, Gen Ichimura
  • Patent number: 10847948
    Abstract: A system and methods are drawn to a self-injection locked tunable laser using an InGaN/GaN gain chip to produce precise laser output at visible wavelengths. An external cavity length is adjusted by motorized stage to tune a resonance frequency of the external cavity to match the resonance frequency of the laser and self-injection lock the mode of the wavelength. Fine tuning is provided by adjusting the tilt angle of the partially reflective mirror. The laser diode may be operated at a range of injection currents and temperatures and provides precise control of output laser wavelengths and linewidths.
    Type: Grant
    Filed: March 13, 2019
    Date of Patent: November 24, 2020
    Assignee: King Fahd University of Petroleum and Minerals
    Inventors: Mohammed Zahed Mustafa Khan, Md. Hosne Mobarok Shamim, Tien Khee Ng, Boon S. Ooi
  • Patent number: 10830954
    Abstract: An optical coupling device is described herein. The optical coupling device comprises a first waveguide and a second waveguide that are formed on a common substrate, and a resonator that is positioned out of plane with the two waveguides. The resonator and waveguides are positioned such that light traveling in each of the waveguides evanescently couples to the resonator but not to the other of the waveguides. The optical coupling device can be used in connection with improving linewidth of a laser source for a lidar sensor. In another example, the optical coupling device can be used in connection with wavelength division multiplexing.
    Type: Grant
    Filed: June 4, 2019
    Date of Patent: November 10, 2020
    Assignee: GM Cruise Holdings LLC
    Inventors: Jacob Levy, Vala Fathipour, Lutfollah Maleki, Vladimir S. Ilchenko
  • Patent number: 10826272
    Abstract: An optical source may include an optical gain chip that provides an optical signal and that is optically coupled to an SOI chip. The optical gain chip may include a reflective layer. Moreover, the SOI chip may include: a first optical waveguide, a first ring resonator that selectively optically coupled to a second optical waveguide and that performs phase modulation and filtering of the optical signal, the second optical waveguide, an amplitude modulator, and an output port. Note that the reflective layer in the optical gain chip and the amplitude modulator may define an optical cavity. Furthermore, a resonance of the first ring resonator may be aligned with a lasing wavelength, and the resonance of the first ring resonator and a resonance of the amplitude modulator may be offset from each other. Additionally, modulation of the first ring resonator and the amplitude modulator may be in-phase with each other.
    Type: Grant
    Filed: July 18, 2018
    Date of Patent: November 3, 2020
    Assignee: Axalume, Inc.
    Inventors: Jock Bovington, Xuezhe Zheng, Saman Saeedi, Ashok V. Krishnamoorthy
  • Patent number: 10827152
    Abstract: Disclosed herein is a novel a tunable Micro-Electro-Mechanical (MEMS) Etalon system including: a functional layer patterned to define a suspension structure for suspending a first mirror being an aperture mirror of the Etalon, an aperture mirror coupled to the suspension structure, and a back layer including a second mirror, being a back mirror of the Etalon. The functional layer may be located above the back layer and the back layer may include spacer structures protruding therefrom towards the aperture mirror to define a minimal gap between the aperture mirror and the back mirror and prevent collision between them. The aspect ratio between the width of the etalon/mirrors may be high (e.g. at least 500), and the minimal gap/distance between the mirrors may be small in the order of tens of nanometers (nm).
    Type: Grant
    Filed: July 14, 2016
    Date of Patent: November 3, 2020
    Assignee: TECHNOLOGY INNOVATION MOMENTUM FUND (ISRAEL) LIMITED PARTNERSHIP
    Inventors: Viacheslav Krylov, Ariel Raz, David Mendlovic
  • Patent number: 10816463
    Abstract: A laser spectrometer includes a tunable laser assembly, a periodically-poled nonlinear optical crystal, with parallel polished input and output end faces, and a mechanism for controlling an entrance location of a pump input beam of the tunable laser on the input end face of the periodically-poled nonlinear optical crystal, such that the pump input beam traverses different grating periods of the periodically-poled nonlinear optical crystal.
    Type: Grant
    Filed: August 9, 2018
    Date of Patent: October 27, 2020
    Assignee: United States of America as represented by the Administrator of NASA
    Inventors: Kenji Numata, Haris Riris, Stewart T. Wu, Xiaoli Sun
  • Patent number: 10788633
    Abstract: In example implementations, an apparatus is provided. The apparatus includes an optical transmission component and an optical reception component. The optical transmission component includes a plurality of lasers and a transmit filter. The plurality of lasers each emit a different wavelength of light. The transmit filter includes a plurality of different regions that correspond to one of the different wavelengths of light emitted by the plurality of lasers. The optical reception component includes a plurality of photodiodes and a complementary reverse order (CRO) filter. The CRO filter includes a same plurality of different regions as the transmit filter in a reverse order.
    Type: Grant
    Filed: April 30, 2018
    Date of Patent: September 29, 2020
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Kevin B. Leigh, Paul Kessler Rosenberg, Sagi Mathai, Wayne Victor Sorin, Michael Renne Ty Tan, Georgios Panotopoulos
  • Patent number: 10781096
    Abstract: A MEMS device includes a substrate, a MEMS element portion disposed on a surface of the substrate, a cap having a cavity formed to oppose the MEMS element portion, and a diffusion prevention layer formed on at least a portion of the cap, wherein at least one of the cap and the substrate includes a bonding layer disposed outside of the cavity, and wherein the cap includes a spreading prevention portion disposed between the bonding layer and the cavity and having a V-shape in cross-section.
    Type: Grant
    Filed: March 19, 2019
    Date of Patent: September 22, 2020
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Tae Hun Lee, Kwang Su Kim, Tae Yoon Kim
  • Patent number: 10784652
    Abstract: There is disclosed a DBR laser and a method of use. The DBR laser comprises a phase section in a cavity of the DBR laser and configured to adjust an optical path length of the cavity. A DBR section comprises a frequency tuning system configured to adjust a Bragg frequency of the DBR section. A detector is configured to detect laser light transmitted through the DBR section.
    Type: Grant
    Filed: September 27, 2017
    Date of Patent: September 22, 2020
    Assignee: Lumentum Technology UK Limited
    Inventors: Samuel Davies, Andrew John Ward, Andrew Cannon Carter
  • Patent number: 10749314
    Abstract: A method of determining initial parameters and target values for tuning an emission wavelength of a wavelength tunable laser capable of emitting laser light in a substantial wavelength range is disclosed. The method iterates an evaluation of initial parameters and target values at target wavelengths in a preset order. The evaluation includes steps of supplying empirically obtained parameters to the t-LD, confirming whether the t-LD generates an optical beams, determining the initial parameters and the target values by carrying out feedback loops of the AFC and the APC when the t-LD generates the optical beam, or shifting the wavelength range so as to exclude the current target wavelength when the t-LD generates no optical beam.
    Type: Grant
    Filed: September 5, 2019
    Date of Patent: August 18, 2020
    Assignee: Sumitomo Electric Device Innovations, Inc.
    Inventor: Hirokazu Tanaka
  • Patent number: 10741999
    Abstract: Methods, systems, and apparatus, including a laser including a layer having first and second regions, the first region including a void; a mirror section provided on the layer, the mirror section including a waveguide core, at least part of the waveguide core is provided over at least a portion of the void; a first grating provided on the waveguide core; a first cladding layer provided between the layer and the waveguide core and supported by the second region of the layer; a second cladding layer provided on the waveguide core; and a heat source configured to change a temperature of at least one of the waveguide core and the grating, where an optical mode propagating in the waveguide core of the mirror section does not incur substantial loss due to interaction with portions of the mirror section above and below the waveguide core.
    Type: Grant
    Filed: January 9, 2018
    Date of Patent: August 11, 2020
    Assignee: Infinera Coropration
    Inventors: Peter W. Evans, Mingzhi Lu, Fred A. Kish, Jr., Vikrant Lal, Scott Corzine, John W. Osenbach, Jin Yan
  • Patent number: 10727938
    Abstract: Systems, methods, and structures for overcoming Rayleigh backscatter in wavelength division multiplexed fiber optic systems and in particular fiber optic sensor systems along with method(s) for detecting faults in optical networks employing the intentional temporal separation of share wavelength noise and demarcation signals in conjunction with the use of accumulated Rayleigh noise signal(s) to detect a fault location.
    Type: Grant
    Filed: March 11, 2019
    Date of Patent: July 28, 2020
    Assignee: Luna Innovations Incorporated
    Inventors: Todd Christian Haber, Justin Stay, Joel Leslie Mock, Daniele Costantini
  • Patent number: 10720746
    Abstract: An optical element includes an optical waveguide layer. The optical waveguide includes a periodic structure of grooves. The optical waveguide layer has a layer-thickness equal to or greater than 1.5 ?m and is made of material selected from a group consisting of Ta2O5, Al2O3, LiNbO3, LiTaO3, AlN, GaN, SiC, and Yttrium aluminum garnet (YAG). (D/0.5?)?2.5 is satisfied where D indicates the depth of groove; and ? indicates the pitch of the arranged grooves in the periodic structure. The unit of ? is identical to the unit of D.
    Type: Grant
    Filed: May 31, 2019
    Date of Patent: July 21, 2020
    Assignee: NGK Insulators, Ltd.
    Inventors: Kousuke Niwa, Jungo Kondou, Shoichiro Yamaguchi, Keiichiro Asai
  • Patent number: 10714895
    Abstract: An optical source may include an optical gain chip that provides an optical signal and that is optically coupled to an SOI chip. The optical gain chip may include a reflective layer. Moreover, the SOI chip may include: a common optical waveguide, a splitter that splits the optical signal into optical signals, a first pair of resonators that are selectively optically coupled to the common optical waveguide and that are configured to perform modulation and filtering of the optical signals, and a first bus optical waveguide that is selectively optically coupled to the first pair of resonators. Furthermore, resonance wavelengths of the resonators may be offset from each other with a (e.g., fixed) separation approximately equal or corresponding to a modulation amplitude, and a reflectivity of the first pair of resonators may be approximately independent of the modulation.
    Type: Grant
    Filed: July 18, 2018
    Date of Patent: July 14, 2020
    Assignee: Axalume, Inc.
    Inventors: Ashok V. Krishnamoorthy, Jock Bovington, Xuezhe Zheng, Saman Saeedi
  • Patent number: 10707648
    Abstract: A technique for narrowing a linewidth of a plurality of lines of a coherent comb laser (CCL) concurrently comprises providing a mode-locked semiconductor coherent comb laser (CCL) adapted to output of at least 4 mode-locked lines; tapping a fraction of a power from the CCL from the laser cavity to form a tapped beam; propagating the tapped beam to an attenuator to produce an attenuated beam; and reinserting the attenuated beam into the laser cavity, where the reinserted beam has a power less than 10% of a power of the tapped beam. The reinsertion allows the CCL to be operated to output the mode-locked lines, each with a linewidth of less than 80% of the original linewidth. By propagating the tapped and attenuated beams on a solid waveguide, and ensuring that the secondary cavity is polarization maintaining, improved stability of the linewidth narrowing is ensured.
    Type: Grant
    Filed: July 31, 2018
    Date of Patent: July 7, 2020
    Assignee: National Research Council of Canada
    Inventors: Zhenguo Lu, Jiaren Liu, Philip Poole, Chunying Song, Shoude Chang
  • Patent number: 10707647
    Abstract: A technique for narrowing a linewidth of a plurality of lines of a coherent comb laser (CCL) concurrently comprises providing a mode-locked semiconductor coherent comb laser (CCL) adapted to output of at least 4 mode-locked lines; tapping a fraction of a power from the CCL from the laser cavity to form a tapped beam; propagating the tapped beam to an attenuator to produce an attenuated beam; and reinserting the attenuated beam into the laser cavity, where the reinserted beam has a power less than 10% of a power of the tapped beam. The reinsertion allows the CCL to be operated to output the mode-locked lines, each with a linewidth of less than 80% of the original linewidth. By propagating the tapped and attenuated beams on a solid waveguide, and ensuring that the secondary cavity is polarization maintaining, improved stability of the linewidth narrowing is ensured.
    Type: Grant
    Filed: July 31, 2018
    Date of Patent: July 7, 2020
    Assignee: National Research Council of Canada
    Inventors: Zhenguo Lu, Jiaren Liu, Philip Poole, Chunying Song, Shoude Chang
  • Patent number: 10700491
    Abstract: A semiconductor laser is for generating colored light. The semiconductor laser oscillates in a longitudinal multimode. A width of a wavelength band with an intensity equal to or more than ?20 dB relative to a peak intensity in a spectrum distribution of output light is equal to or less than 15 nm. A light source device may include The semiconductor laser; a wavelength estimating device configured to estimate a wavelength ? of light from the semiconductor laser; and an emission-light intensity setting unit configured to set an emission light intensity of the semiconductor laser in accordance with an estimation result by the wavelength estimating device.
    Type: Grant
    Filed: April 19, 2017
    Date of Patent: June 30, 2020
    Assignee: RICOH COMPANY, LTD.
    Inventors: Kohji Sakai, Miho Higuchi
  • Patent number: 10700788
    Abstract: A method and an apparatus for compensating for wavelength drift are disclosed. The method includes: generating, by a burst control circuit, a burst bias current; sending, by the burst control circuit, the burst bias current to a light emitting part and a trigger; converting, by the trigger, the received burst bias current into burst DA data; sending, by the trigger, the burst DA data to a synthesizer circuit; receiving, by the synthesizer circuit, the burst DA data sent by the trigger and the calibrated DA data sent by the MCU respectively; synthesizing, by the synthesizer circuit, the burst DA data and the calibrated DA data to obtain a synthesized signal; and sending, by the synthesizer circuit, the synthesized signal to a temperature control part.
    Type: Grant
    Filed: February 25, 2019
    Date of Patent: June 30, 2020
    Assignee: WUHAN TELECOMMUNICATION DEVICES CO., LTD.
    Inventors: Zhenfeng Xue, Yongan Fu, Liping Sun, Jun Zhang, Yaping Lv, Ting Gao, Chao Luo, Chaoqun Wu
  • Patent number: 10680408
    Abstract: A quantum dot comb laser includes a body defining a lasing cavity and an extension defining an external cavity, the FSR of the lasing cavity being an inverse of an integer multiple of the FSR of the external cavity.
    Type: Grant
    Filed: August 22, 2018
    Date of Patent: June 9, 2020
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Geza Kurczveil, Chong Zhang, Di Liang, Raymond G. Beausoleil
  • Patent number: 10680410
    Abstract: Practical silicon-based light sources are still missing, despite the progress in germanium lasers, because both silicon and germanium are indirect-band semiconductors and inefficient at light generation. A tunable and single mode external cavity laser comprising: a gain medium for generating light between a reflective surface at one end of the gain medium; and a wavelength selective reflector at the other end of a laser cavity. A splitter disposed in the laser cavity includes an input port optically coupled to the gain medium, an input/output port optically coupled to the wavelength selective reflector, and an output port for outputting laser light at selected wavelengths. The wavelength selective reflector reflects light of one or more selected periodic wavelengths back to the gain medium via the input/output port, and passes light of non-selected wavelengths out of the laser cavity.
    Type: Grant
    Filed: October 28, 2019
    Date of Patent: June 9, 2020
    Assignee: Elenion Technologies, LLC
    Inventors: Yangjin Ma, Yang Liu, Ruizhi Shi, Thomas Wetteland Baehr-Jones, Saeed Fathololoumi
  • Patent number: 10680409
    Abstract: A Distributed Feedback Laser comprises a layer stack comprising a p-layer, an n-layer which are arranged so as to form an pn-junction having an active layer in between. Within the layer stack, an index coupled grating layer or a grating layer is arranged which comprises a first, a second, and a third grating portion. The first, the second, and the third grating portions are asymmetrically arranged along a lateral dimension of the layer stack, wherein the second grating portion is formed without a grating structure.
    Type: Grant
    Filed: March 7, 2018
    Date of Patent: June 9, 2020
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
    Inventor: Martin Moehrle
  • Patent number: 10677771
    Abstract: Methods, systems and computer program products for detecting gas leaks using a drone are provided. Aspects include capturing a first set of data regarding a presence of a gas in the geographic area while flying along the initial flight path. Aspects also include creating secondary flight paths through regions in the geographic area in which the presence of the gas exceeds a threshold amount and capturing a second set of data regarding a concentration of the gas in the one or more regions while flying along the secondary flight paths. Aspects further include capturing wind data while flying along the initial and second flight paths and creating a three-dimensional gas plume model for gas leaks identified in the geographic area based on the first set of data, the second set of data and the wind data, wherein the three-dimensional gas plume model identifies a source of the gas leaks.
    Type: Grant
    Filed: November 1, 2017
    Date of Patent: June 9, 2020
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Matthias Dittberner, Levente Klein, Jason D. Renwick
  • Patent number: 10673205
    Abstract: A method of controlling a wavelength of a wavelength tunable laser module includes: referring to data of measured frequencies and wavelength filter control values at two or more points for each basic frequency channel, the data being stored in a memory of a controller; selecting the basic frequency channel closest to a frequency of laser light that a laser light source is instructed to emit; calculating a first wavelength filter control value for providing the instructed frequency of laser light from the data of the measured frequencies allocated to the basic frequency channel closest to the instructed frequency and the wavelength filter control values; and controlling the transmission characteristic of a wavelength filter using the first wavelength filter control value.
    Type: Grant
    Filed: March 20, 2019
    Date of Patent: June 2, 2020
    Assignee: FURUKAWA ELECTRIC CO., LTD.
    Inventors: Masayoshi Nishita, Kengo Muranushi, Atsushi Yamamoto
  • Patent number: 10666016
    Abstract: Higher power tunable lasers are feasible using photonics integrated circuit based external cavity laser configurations by using multiple RSOAs inside a single cavity to provide multiple on-chip coherent optical output at the same wavelength. The total collective output power in various output branches potentially adds up being higher than what commercial lasers can provide. Using multiple RSOA increases and distributes the number of gain materials, which keeps them in a linear regime and avoids available gain saturation, which thereby removes gain saturation limitation in optical amplifications.
    Type: Grant
    Filed: May 9, 2018
    Date of Patent: May 26, 2020
    Assignee: Elenion Technologies, LLC
    Inventors: Thomas Wetteland Baehr-Jones, Saeed Fathololoumi
  • Patent number: 10651820
    Abstract: A signal processing apparatus, being configured for transmitting and receiving coherent parallel optical signals, comprises a transmitter apparatus including a first single soliton micro-resonator device and a modulator device, wherein the first single soliton micro-resonator device is adapted for creating a single soliton providing a first frequency comb, wherein the first frequency comb provides a plurality of equidistant optical carriers with a frequency spacing corresponding to a free spectral range of the first single soliton micro-resonator device, and the modulator device is adapted for modulating the optical carriers according to data to be transmitted, and a receiver apparatus including a coherent receiver device with a plurality of coherent receivers and a local oscillator device providing a plurality of reference optical signals, wherein the coherent receiver device and the local oscillator device are arranged for coherently detecting the transmitted modulated optical carriers, wherein the signal p
    Type: Grant
    Filed: September 13, 2017
    Date of Patent: May 12, 2020
    Assignee: Ecole Polytechnique Federale de Lausanne (EPFL)
    Inventors: Tobias Kippenberg, Christian Koos, Pablo Marin-Palomo, Juned Nassir Kemal
  • Patent number: 10637208
    Abstract: A tunable laser device based on silicon photonics includes a substrate configured with a patterned region comprising one or more vertical stoppers, an edge stopper facing a first direction, a first alignment feature structure formed in the patterned region along the first direction, and a bond pad disposed between the vertical stoppers. Additionally, the tunable laser includes an integrated coupler built in the substrate located at the edge stopper and a laser diode chip including a gain region covered by a P-type electrode and a second alignment feature structure formed beyond the P-type electrode. The laser diode chip is flipped to rest against the one or more vertical stoppers with the P-type electrode attached to the bond pad and the gain region coupled to the integrated coupler. Moreover, the tunable laser includes a tuning filter fabricated in the substrate and coupled via a wire waveguide to the integrated coupler.
    Type: Grant
    Filed: November 2, 2018
    Date of Patent: April 28, 2020
    Assignee: INPHI CORPORATION
    Inventors: Radhakrishnan L. Nagarajan, Masaki Kato, Nourhan Eid, Kenneth Ling Wong
  • Patent number: 10612906
    Abstract: There is described an interferometer for use in an optical locker. The interferometer comprises at least two transparent materials having different thermal path length sensitivities. The interferometer is configured such that an input beam is split by the interferometer into first and second intermediate beams, which recombine to form an output beam, the first and second intermediate beams travelling along respective first and second intermediate beam paths which do not overlap. At least one of the intermediate beam paths passes through at least two of the transparent materials. A length of each intermediate beam path which passes through each transparent material is selected such that an optical path difference between the first and second intermediate beam path is substantially independent of temperature.
    Type: Grant
    Filed: June 26, 2017
    Date of Patent: April 7, 2020
    Assignee: Lumentum Technology UK Limited
    Inventor: Adrian Perrin Janssen
  • Patent number: 10615571
    Abstract: A tunable source includes a short-cavity laser optimized for performance and reliability in SSOCT imaging systems, spectroscopic detection systems, and other types of detection and sensing systems. The short cavity laser has a large free spectral range cavity, fast tuning response and single transverse, longitudinal and polarization mode operation, and includes embodiments for fast and wide tuning, and optimized spectral shaping. Disclosed are both electrical and optical pumping in a MEMS-VCSEL geometry with mirror and gain regions optimized for wide tuning, high output power, and a variety of preferred wavelength ranges; and a semiconductor optical amplifier, combined with the short-cavity laser to produce high-power, spectrally shaped operation. Several preferred imaging and detection systems make use of this tunable source for optimized operation are also disclosed.
    Type: Grant
    Filed: April 30, 2018
    Date of Patent: April 7, 2020
    Assignees: Thorlabs, Inc., Praevium Research, Inc.
    Inventors: Alex Ezra Cable, Vijaysekhar Jayaraman, Benjamin Michael Potsaid
  • Patent number: 10587094
    Abstract: A semiconductor laser source includes a partial-grating DFB laser with two laser electrodes, one over the grating and the other between the grating and one end of the laser. Constant laser currents flow into the waveguide through the electrodes (typically different from each other) and produce laser output. A wavelength discriminator, an optical detector, and a wavelength-control circuit act as a wavelength-control feedback mechanism to generate a wavelength control current that flows through one laser electrode or the other, or through both electrodes with opposite polarities. Phase noise on the laser output can be reduced at modulation frequencies exceeding several hundred kHz up to one or several tens of MHz or more. The laser-wavelength can be swept while exhibiting reduced phase noise.
    Type: Grant
    Filed: September 27, 2018
    Date of Patent: March 10, 2020
    Assignee: Emcore Corporation
    Inventor: Henry A. Blauvelt
  • Patent number: 10584959
    Abstract: A FBG strain sensor arrangement includes a sensor carrier of steel sheet to which a FBG strain sensor is fastened. A protective cover has a first part configured thin and narrow and bonded to the sensor carrier along an optical fiber so that the optical fiber lying underneath is fixed with a fiber Bragg grating on the sensor carrier. The protective cover is enlarged at each end portion of the optical fiber to thereby form a cavity underneath, with edges of the enlarged second part of the protective cover being bonded to the sensor carrier. Arranged in the cavity is an elastic filler which embeds the coupling points in a vibration damping manner. The protective cover with elastic filler accommodates thermal expansions and functions for dynamic measurements by the vibration damping.
    Type: Grant
    Filed: July 24, 2017
    Date of Patent: March 10, 2020
    Assignee: Hottinger Baldwin Messtechnik GmbH
    Inventors: Jochen Maul, Tobias Kipp, Bernd Günther, Maria Marta Cabral Bobião Girão, Francisco Manuel Moita Araújo
  • Patent number: 10560184
    Abstract: Systems and methods are disclosed, including an optical switching system comprising an upstream optical signal detector between a first node and a second node configured to detect optical signals from the second node and to switch data traffic from a working path to a protecting path when optical signals from the second node are indicative of a failure in the working path; wherein the first node is configured to transmit data traffic in first optical signals with wavelengths in channels in a first band and receive the data traffic in second optical signals with wavelengths in channels in a second band from the second node; and one or more optical filter, between the second node and the upstream optical signal detector, configured to block signals with wavelengths in the first band that are reflected because of a break in the path between the optical filter and the second node.
    Type: Grant
    Filed: July 20, 2018
    Date of Patent: February 11, 2020
    Assignee: Infinera Corporation
    Inventors: Bengt Johansson, Ola Wikström
  • Patent number: 10522972
    Abstract: In accordance with one aspect of the present application there is provided a DBR, laser. The DBR laser comprises a phase section in a cavity of the DBR laser configured to adjust an optical path length of the cavity. The laser also comprises a DBR section comprising a frequency tuning system, the frequency tuning system comprising a resistance heater configured to apply heat to a grating of the DBR section in order to adjust a Bragg frequency of the DBR section. A detector is configured to detect laser light transmitted through the DBR section.
    Type: Grant
    Filed: September 28, 2017
    Date of Patent: December 31, 2019
    Assignee: Lumentum Technology UK Limited
    Inventor: Andrew Cannon Carter
  • Patent number: 10523357
    Abstract: A laser component includes multiple laser devices arranged in an array to include different emission wavelengths, and a driving unit that, while switching each of the laser devices along the array into a turn-ON-enabled state that enables the laser device to turn to an ON state, brings one of the laser devices that has an emission wavelength corresponding to a predetermined wavelength into an ON state and maintains the ON state.
    Type: Grant
    Filed: June 21, 2017
    Date of Patent: December 31, 2019
    Assignee: FUJI XEROX CO., LTD.
    Inventor: Takashi Kondo
  • Patent number: 10502901
    Abstract: A tunable light source includes a light source; a wavelength selecting device that selects, according to a control signal, output light with a specific wavelength from light output from the light source; and a wavelength monitor including a wavelength filter including multiple output ports corresponding to filtering paths through which the output light passes, and a light-receiving device that is disposed to face one of the output ports and receives light output from the one of the output ports. The wavelength filter is configured such that a maximum quantity of the light output from the one of the output ports facing the light-receiving device becomes greater than a maximum quantity of light output from another one of the output ports.
    Type: Grant
    Filed: July 27, 2018
    Date of Patent: December 10, 2019
    Assignee: FUJITSU OPTICAL COMPONENTS LIMITED
    Inventor: Masaki Sugiyama
  • Patent number: 10490978
    Abstract: The present invention provides a surface emitting laser the wavelength-tunable band of which is wide. The wavelength-tunable surface emitting laser includes a first reflector (101), an active layer (103) disposed on the first reflector (101), a beam portion (110) disposed over the active layer (103) with an air gap therebetween, and a second reflector (120) disposed on the beam portion (110). The second reflector (120) has a distributed Bragg reflector consisting of a stack of dielectric layers. The beam portion (110) has a distributed Bragg reflector consisting of a stack of conductive semiconductor layers.
    Type: Grant
    Filed: April 21, 2016
    Date of Patent: November 26, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yasuhiro Nagatomo
  • Patent number: 10483718
    Abstract: A laser including: a gain chip; an external cavity incorporating a Bragg grating; and a baseplate; wherein a first end of the gain chip has a high reflectivity facet forming a first end of the laser cavity; a second end of the gain chip has a low reflectivity facet; and a second part of the external cavity comprises a Bragg grating, supported by the baseplate, the temperature of the baseplate being maintained through a feedback loop; wherein the optical length of the external cavity is at least an order of magnitude greater than the optical length of the gain chip; wherein the Bragg grating is physically long and occupies a majority of the length of the external cavity and is apodized to control the sidemodes of the grating reflection.
    Type: Grant
    Filed: December 31, 2018
    Date of Patent: November 19, 2019
    Assignee: Morton Photonics, Inc.
    Inventor: Paul Morton
  • Patent number: 10466421
    Abstract: Wavelength division multiplexing (WDM) has enabled telecommunication service providers to provide multiple independent multi-gigabit channels on one optical fiber. To meet demands for improved performance, increased integration, reduced footprint, reduced power consumption, increased flexibility, re-configurability, and lower cost monolithic optical circuit technologies and microelectromechanical systems (MEMS) have become increasingly important. However, further integration via microoptoelectromechanical systems (MOEMS) of monolithically integrated optical waveguides upon a MEMS provide further integration opportunities and functionality options. Such MOEMS may include MOEMS mirrors and optical waveguides capable of deflection under electronic control. In contrast to MEMS devices where the MEMS is simply used to switch between two positions the state of MOEMS becomes important in all transition positions.
    Type: Grant
    Filed: March 9, 2015
    Date of Patent: November 5, 2019
    Assignee: Aeponyx Inc.
    Inventors: Francois Menard, Michael Menard, Frederic Nabki, Martin Berard, Jonathan Briere
  • Patent number: 10451806
    Abstract: An optical frequency comb generator device is disclosed. In one implementation, the optical frequency comb generator device comprises a bus waveguide, at least a first optical ring resonator optically coupled to the bus waveguide, and at least a first grating located on the first optical ring resonator opposite from the bus waveguide. The first optical ring resonator and the first grating are configured to generate counter-propagating optical frequency combs that are offset from each other at a controllable bandwidth.
    Type: Grant
    Filed: June 1, 2018
    Date of Patent: October 22, 2019
    Assignee: Honeywell International Inc.
    Inventors: Matthew Wade Puckett, Neil A. Krueger, Jianfeng Wu
  • Patent number: 10439363
    Abstract: A method of manufacturing a quantum cascade laser beam source (1) includes: preparing a semiconductor stacked body (20); forming a pair of first excavated portions (41 and 42) and a ridge portion which is interposed between the pair of first excavated portions (41 and 42); forming channel structures (51 and 52) and circumferential edge portions (61 and 62) which are formed to interpose the channel structures (51 and 52) between the ridge portion (30) and the circumferential edge portion; forming an electrode pattern (81) in contact with a first area (29a) and forming an electrode pattern (82) in contact with a second area (22a); fixing a crystal growth surface side to a support substrate (91); removing an Fe-doped (semi-insulating) InP single-crystal substrate (21); fixing a Si substrate (93); and peeling the support substrate (91).
    Type: Grant
    Filed: September 5, 2018
    Date of Patent: October 8, 2019
    Assignee: HAMAMATSU PHOTONICS K.K.
    Inventors: Akio Ito, Kazuue Fujita, Daisuke Kawaguchi, Tatsuo Dougakiuchi, Tadataka Edamura
  • Patent number: 10439357
    Abstract: Examples of the present disclosure include a tunable laser comprising a waveguide including gain section. The waveguide overlies and is optically coupled to another waveguide. The another waveguide has a reflector at one end. A laser cavity is formed in the waveguides.
    Type: Grant
    Filed: July 6, 2017
    Date of Patent: October 8, 2019
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Stanley Cheung, Michael Renne Ty Tan, Wayne V Sorin, Joaquin Matres Abril, Sagi Mathai
  • Patent number: 10401377
    Abstract: The present invention relates to a system comprising a light source configured to produce an emitted light beam. An etalon is positioned to receive the light beam and is configured to generate a plurality of product light beams. The etalon is mounted to a support structure at one or more pivot points. A detector is positioned to receive and configured to measure intensity values for the product light beams. A computing device is coupled to the detector. The computing device includes a processor and a memory coupled to the processor so that the processor executes programmed instructions stored in the memory to determine, based on the measured intensity values, a change in position of the etalon relative to the one or more pivot points. Also disclosed are methods for measuring the vibration and monitoring the condition of an object utilizing the system.
    Type: Grant
    Filed: February 13, 2015
    Date of Patent: September 3, 2019
    Assignee: Micatu Inc.
    Inventors: Atul Pradhan, Michael Oshetski
  • Patent number: 10401603
    Abstract: A device and method are for shaping and scanning an ultrafast laser beam. The device includes a laser source configured to output a pulsed laser beam containing different frequency spectrum, a digital micromirror device (DMD) consisting of micromirrors, which are configured to receive the laser beam and shape the received laser beam with computer generated holograms, and a dispersion compensation unit, arranged before or after the DMD, which is configured to transfer the laser beam from the laser source to the DMD with a designated angular dispersion for neutralizing the first angular dispersion introduced by the DMD.
    Type: Grant
    Filed: September 21, 2015
    Date of Patent: September 3, 2019
    Assignee: THE CHINESE UNIVERSITY OF HONG KONG
    Inventors: Shih-Chi Chen, Jiyi Cheng, Chenglin Gu, Dapeng Zhang