Optical Amplifier Patents (Class 359/333)
  • Patent number: 11228822
    Abstract: A transmission device, includes a first wavelength converter configured to convert a second wavelength-multiplexed signal in a first wavelength band to a second wavelength band different from the first wavelength band, and a multiplexer configured to transmit, after the conversion, a wavelength-multiplexed signal obtained through multiplexing of a first wavelength-multiplexed signal in the first wavelength band, a first supervisory control signal light ray that is a control signal for the first wavelength-multiplexed signal, the second wavelength-multiplexed signal in the second wavelength band, and a second supervisory control signal light ray that is a control signal for the second wavelength-multiplexed signal, wherein the first supervisory control signal light ray and the second supervisory control signal light ray each have a wavelength in a wavelength band different from the first wavelength band and the second wavelength band.
    Type: Grant
    Filed: December 22, 2020
    Date of Patent: January 18, 2022
    Assignee: FUJITSU LIMITED
    Inventors: Masahiro Yuki, Shingo Hara, Takeshi Sakamoto
  • Patent number: 11222734
    Abstract: A method for increasing the MeV hot electron yield and secondary radiation produced by short-pulse laser-target interactions with an appropriately high or low atomic number (Z) target. Secondary radiation, such as MeV x-rays, gamma-rays, protons, ions, neutrons, positrons and electromagnetic radiation in the microwave to sub-mm region, can be used, e.g., for the flash radiography of dense objects.
    Type: Grant
    Filed: July 12, 2019
    Date of Patent: January 11, 2022
    Assignee: LAWRENCE LIVERMORE NATIONAL SECURITY, LLC
    Inventors: Jeffrey D. Bude, David A. Alessi, Maurice B. Aufderheide, John E. Heebner, Andreas J. Kemp, Otto L. Landen, Andrew J. Mackinnon, Raluca A. Negres, Craig W. Siders, Scott C. Wilks, Wade H. Williams, Steven T. Yang, Thomas M. Spinka
  • Patent number: 11199393
    Abstract: There is described a method for interrogating optical fiber comprising fiber Bragg gratings (“FBGs”), using an optical fiber interrogator. The method comprises (a) generating an initial light pulse from phase coherent light emitted from a light source, wherein the initial light pulse is generated by modulating the intensity of the light; (b) splitting the initial light pulse into a pair of light pulses; (c) causing one of the light pulses to be delayed relative to the other of the light pulses; (d) transmitting the light pulses along the optical fiber; (e) receiving reflections of the light pulses off the FBGs; and (f) determining whether an optical path length between the FBGs has changed from an interference pattern resulting from the reflections of the light pulses.
    Type: Grant
    Filed: January 11, 2018
    Date of Patent: December 14, 2021
    Assignee: HiFi Engineering Inc.
    Inventors: Brian H. Moore, Walter Jeffrey Shakespeare, Phillip William Wallace, Viet Hoang, Chris Henrikson, Ajay Sandhu, Adrian Dumitru, Thomas Clement, Dongliang Huang, Seyed Ehsan Jalilian
  • Patent number: 11194024
    Abstract: A LIDAR arrangement comprising a laser transmitter for transmitting pulses of a laser radiation to a measurement object, and a receiver for receiving pulses of the laser radiation backscattered from the measurement object, wherein the laser transmitter is configured to transmit a pulse sequence in which successive pulses respectively comprise a particular optical frequency shift to each other and wherein the receiver either includes a dispersive element for separating the pulses in time depending on the optical frequency by a frequency-based deflection, and a position resolution optical matrix transmitter on which the pulses separated in time by the dispersive element are mapped, or includes a frequency analyzer for the frequency-based separation of the pulses by superimposition with a reference radiation.
    Type: Grant
    Filed: July 12, 2018
    Date of Patent: December 7, 2021
    Assignee: Airbus Defence and Space GmbH
    Inventors: Nikolaus Schmitt, Thorsteinn Halldorsson
  • Patent number: 11181702
    Abstract: A coupling structure includes a single mode active device and a planar optical waveguide. Specifically, the planar optical waveguide includes a silica waveguide for transmitting an optical signal, where the silica waveguide includes a coupling section and a conduction section; the coupling section is of a regular trapezoidal structure or an inverted trapezoidal structure, where a surface of the coupling section coupled to the single mode active device is a trapezoid top, and a surface of the coupling section connected with the conduction section is a trapezoid bottom; and a coupling gap is preset between the single mode active device and the planar optical waveguide.
    Type: Grant
    Filed: April 9, 2020
    Date of Patent: November 23, 2021
    Assignee: Wuhan Telecommunication Devices Co., Ltd.
    Inventors: Ben Chen, Xuerui Liang, Baiquan Hu, Chenggang Liu, Di Zhang, Yongan Fu, Liping Sun, Weidong Ma, Xianghong Yu
  • Patent number: 11163111
    Abstract: A multi-clad optical fiber design is described in order to provide low optical loss, a high numerical aperture (NA), and high optical gain for the fundamental propagating mode, the linearly polarized (LP) 01 mode in the UV and visible portion of the optical spectrum. The optical fiber design may contain dopants in order to simultaneously increase the optical gain in the core region while avoiding additional losses during the fiber fabrication process. The optical fiber design may incorporate rare-earth dopants for efficient lasing. Additionally, the modal characteristics of the propagating modes in the optical core promote highly efficient nonlinear mixing, providing for a high beam quality (M2<1.5) output of the emitted light.
    Type: Grant
    Filed: April 27, 2020
    Date of Patent: November 2, 2021
    Assignee: Nuburu, Inc.
    Inventors: Mark S. Zediker, Robert A. Stegeman, James P. Tucker, Jean-Philippe Feve
  • Patent number: 11139633
    Abstract: A system includes a processor communicatively coupled to an Amplifier Stimulated Emission (ASE) source and an optical receiver, wherein the processor is configured to cause transmission of one or more shaped ASE signals, from the ASE source, on an optical fiber, obtain received spectrum of the one or more shaped ASE signals from the optical receiver connected to the optical fiber, and characterize the optical fiber based in part on a nonlinear skirt and/or center dip depth in the received spectrum of the one or more shaped ASE signals. The one or more shaped ASE signals can be formed by the ASE source communicatively coupled to a Wavelength Selective Switch (WSS) that is configured to shape ASE from the ASE source to form the one or more shaped ASE signals with one or two or multiple peaks and with associated frequency.
    Type: Grant
    Filed: March 27, 2019
    Date of Patent: October 5, 2021
    Assignee: Ciena Corporation
    Inventors: Yinqing Pei, David W. Boertjes
  • Patent number: 11114815
    Abstract: A method and apparatus for a silicon photonics chip and a rare-earth-ion-doped waveguide amplifier chip, wherein the rare-earth ion-doped waveguide amplifier is proximate to and optically coupled to the silicon photonics chip.
    Type: Grant
    Filed: December 21, 2017
    Date of Patent: September 7, 2021
    Assignee: Acacia Communications, Inc.
    Inventors: Li Chen, Christopher Doerr
  • Patent number: 11092392
    Abstract: In one aspect, a transparent heat exchanger includes a first transparent substrate optically attached to a heat source, one or more fins to transfer heat from the heat source, the one or more fins comprising transparent material and further comprising one of a manifold coupled to the first transparent substrate or a facesheet coupled to the first transparent material.
    Type: Grant
    Filed: July 8, 2019
    Date of Patent: August 17, 2021
    Assignee: Raytheon Company
    Inventors: Christopher R. Koontz, David Filgas
  • Patent number: 11038316
    Abstract: The invention can include an optical pulse source apparatus that includes the nonlinear generation of wavelengths, wherein the optical pulse source can comprise an oscillator for producing optical pulses, the optical pulses having a first wavelength; an optical fiber amplifier for amplifying optical pulses having the first wavelength; a nonlinear optical fiber receiving amplified optical pulses having the first wavelength to nonlinearly produce optical pulses that include wavelengths that are different than the first wavelength; and wherein the optical pulse source is configured so as to be operable to reduce the optical pulse frequency of the nonlinearly produced optical pulses.
    Type: Grant
    Filed: February 6, 2016
    Date of Patent: June 15, 2021
    Assignee: NKT PHOTONICS A/S
    Inventors: John Redvers Clowes, Anatoly Borisovich Grudinin, Ian Michael Godfrey, Kestutis Vysniauskas
  • Patent number: 10972188
    Abstract: A transmission apparatus includes a first multiplexer configured to multiplex light of wavelengths of a first wavelength band to output first wavelength multiplex light, a first wavelength converter configured to convert the first wavelength multiplex light into wavelengths of a second wavelength band which is different from the first wavelength band, by using first excitation light, a second multiplexer configured to multiplex light of wavelengths of the first wavelength band which are different from the wavelengths of the first wavelength multiplex light to output second wavelength multiplex light, a second wavelength converter configured to convert the second wavelength multiplex light into wavelengths of the second wavelength band, by using second excitation light, a third multiplexer configured to multiplex the first wavelength multiplex light converted into the wavelengths of the second wavelength band, and the second wavelength multiplex light converted into the wavelengths of the second wavelength ban
    Type: Grant
    Filed: March 21, 2019
    Date of Patent: April 6, 2021
    Assignee: FUJITSU LIMITED
    Inventors: Tomoyuki Kato, Shota Mori, Tomoaki Takeyama
  • Patent number: 10932350
    Abstract: An extreme ultraviolet light (EUV) generation system is configured to improve conversion efficiency of energy of a laser system to EUV energy by improving the efficiency of plasma generation. The EUV generation system includes a target generation unit configured to output a target toward a plasma generation region in a chamber. The laser system is configured to generate a first pre-pulse laser beam, a second pre-pulse laser beam, and a main pulse laser beam so that the target is irradiated with the first pre-pulse laser beam, the second pre-pulse laser beam, and the main pulse laser beam in this order. In addition, the EUV generation system includes a controller configured to control the laser system so that a fluence of the second pre-pulse laser beam is equal to or higher than 1 J/cm2 and equal to or lower than a fluence of the main pulse laser beam.
    Type: Grant
    Filed: December 11, 2019
    Date of Patent: February 23, 2021
    Assignee: Gigaphoton Inc.
    Inventors: Tatsuya Yanagida, Osamu Wakabayashi
  • Patent number: 10868404
    Abstract: A technology disclosed in the specification of the subject application relates to a laser light source device capable of suppressing loss of optical output power from a semiconductor laser device, and to a method of manufacturing of a laser light source device while the degree of freedom in arrangement of the semiconductor laser device is secured. A laser light source device according to the subject technology includes a semiconductor laser device, and an optical element provided on an optical axis of an emission light emitted from the semiconductor laser device. The optical element separates a portion of a luminous flux of an emission light that is emitted from the semiconductor laser device and that is not separated in a fast axis direction from another portion so as to be separated in the fast axis direction.
    Type: Grant
    Filed: February 22, 2016
    Date of Patent: December 15, 2020
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Seiji Nakano, Toshihide Seki
  • Patent number: 10868405
    Abstract: A method for controlling an electromagnetic radiation source to produce single mode operation having an optimized side-mode suppression ratio over a set of wavelengths within a prescribed temporal profile. The electromagnetic radiation source is configured to output electromagnetic radiation at a given wavelength based upon parameters. The method includes determining a set of parameter combinations that satisfy a condition for a desired set of wavelengths and a minimum side mode suppression ratio over the range of wavelengths. The set of parameter combinations define sub-paths for nearly arbitrary transitions from one wavelength to another wavelength. Combinations of select sub-paths provide a multivariate path for transitioning over the range of wavelengths. The method also includes controlling the semiconductor laser to emit electromagnetic radiation over the range of wavelengths by traversing the multivariate path in a desired manner.
    Type: Grant
    Filed: June 10, 2019
    Date of Patent: December 15, 2020
    Assignee: INSIGHT PHOTONIC SOLUTIONS, INC.
    Inventors: Jason Ensher, Christopher Wood, Michael Minneman
  • Patent number: 10849486
    Abstract: It is enabled to more appropriately prevent thermal damage to an area irradiated with illumination light. An image acquisition system is provided including: a first light source unit that emits narrow band light having a peak intensity in a specific band; a second light source unit that emits wide band light having a band wider than the specific band; a generation unit that generates multiplexed light by using the narrow band light and the wide band light; an imaging unit that images an irradiation target of the multiplexed light; a prediction unit that performs prediction of a temperature of an area irradiated with the multiplexed light in the irradiation target; and a control unit that performs control of outputs of the narrow band light and the wide band light on the basis of the prediction.
    Type: Grant
    Filed: March 14, 2018
    Date of Patent: December 1, 2020
    Assignee: SONY CORPORATION
    Inventors: Tomoyuki Oki, Akio Furukawa
  • Patent number: 10741720
    Abstract: A light emitting diode includes a square quantum well structure, the quantum well structure including III-V materials. A dielectric layer is formed on the quantum well structure. A plasmonic metal is formed on the dielectric layer and is configured to excite surface plasmons in a waveguide mode that is independent of light wavelength generated by the quantum well structure to generate light.
    Type: Grant
    Filed: February 11, 2019
    Date of Patent: August 11, 2020
    Assignee: International Business Machines Corporation
    Inventors: Yaojia Chen, Ning Li, Devendra K. Sadana, Jinghui Yang
  • Patent number: 10727945
    Abstract: An optical filter comprises an array of waveguides fabricated on an optical integrated circuit (PIC). The array comprises individual waveguides, each of which receive light inputs, e.g., individual taps of a multi-tap optical filter used in an interference cancellation circuit. Each individual waveguide comprises an inlet, and an outlet. Typically, the output(s) of the individual waveguides are located at an exit (edge) of the PIC. In one embodiment, at least one second waveguide in the array is patterned on the PIC in a converged configuration such that, relative to a first waveguide, the light transiting these waveguides co-propagates and interacts across given portions of the respective waveguides before exiting the waveguide array along a common facet, thereby generating or inhibiting one of: intermodulation products, and harmonics. This structural configuration enables the generation of various modes of transmission at the PIC exit, enabling more efficient transfer of the energy, e.g.
    Type: Grant
    Filed: July 15, 2019
    Date of Patent: July 28, 2020
    Assignee: GenXComm, Inc.
    Inventors: Thien-An Nguyen, Monireh Moayedi Pour Fard, Farzad Mokhtari Koushyar, McKay Bradford, Ke Liu
  • Patent number: 10727639
    Abstract: Impingement cooling devices for a laser disk include a carrier plate on the front side of which the laser disk can be secured, and a supporting structure, on the front side of which the rear side of the carrier plate is secured. The supporting structure has a plurality of cooling liquid feed lines from which the cooling liquid emerges in the direction of the rear side of the carrier plate and a plurality of cooling liquid return lines. The feed and return lines run parallel to one another in the longitudinal direction of the supporting structure, and the supporting structure includes a plurality of cutouts or the rear side of the carrier plate that are open toward the supporting structure, and the cooling liquid feed lines lead into and the cooling liquid return lines lead away from the plurality of cutouts.
    Type: Grant
    Filed: October 1, 2018
    Date of Patent: July 28, 2020
    Assignee: TRUMPF LASER GMBH
    Inventors: Alexander Killi, Vincent Kuhn
  • Patent number: 10700789
    Abstract: An optical receiver includes a light receiving element array that includes a plurality of light receiving elements, a plurality of amplifiers that amplify respective currents obtained by the plurality of light receiving elements, a plurality of anode lines arranged in a region between the light receiving element array and the plurality of amplifiers, the plurality of anode lines coupling respective anodes of the plurality of light receiving elements to the plurality of amplifiers, respectively, and a cathode line disposed in a region different from the region between the light receiving element array and the plurality of amplifiers, the cathode line coupling respective cathodes of the plurality of light receiving elements to a bias power supply and a bypass capacitor.
    Type: Grant
    Filed: April 3, 2019
    Date of Patent: June 30, 2020
    Assignee: FUJITSU LIMITED
    Inventors: Takashi Shiraishi, Hideki Takauchi
  • Patent number: 10644475
    Abstract: A random distributed Rayleigh feedback fiber laser based on a double-cladding weakly ytterbium-doped fiber includes: a pump laser source, a pump combiner, a cladding power stripper, and a double-cladding weakly ytterbium-doped fiber for simultaneously achieving distributed active gain and random distributed Rayleigh feedback. An output end of the pump combiner is connected with one end of the double-cladding weakly ytterbium-doped fiber, the other end of the double-cladding weakly ytterbium-doped fiber is connected with an input end of the cladding power stripper, and a concentration of ytterbium ions in the double-cladding weakly ytterbium-doped fiber is in a range of 0.5×1023 to 1×1025/m3. The laser provided by the present invention solves the problem that the existing random fiber lasers cannot simultaneously utilize distributed active gain and random distributed Rayleigh feedback with a single type of fiber.
    Type: Grant
    Filed: August 24, 2018
    Date of Patent: May 5, 2020
    Assignee: University of Electronic Science and Technology of China
    Inventors: Zinan Wang, Jiaqi Li, Han Wu, Yunjiang Rao
  • Patent number: 10637204
    Abstract: In a planar waveguide laser device (1), a substrate (6) is joined to the upper surface of a waveguide (2). A recess (6a) having a chamfered shape is formed along an edge of an end facet of the substrate (6) on the side of the waveguide (2), the end facet being perpendicular to the direction of laser oscillation. An end facet of the waveguide (2) perpendicular to the oscillation direction of laser light is covered with a coating (7). A wraparound portion (7a) continuing from the coating (7) covers the upper surface of the waveguide (2) facing the recess (6a) of the substrate (6).
    Type: Grant
    Filed: July 28, 2016
    Date of Patent: April 28, 2020
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Fumio Shohda, Yojiro Watanabe, Takayuki Yanagisawa
  • Patent number: 10567081
    Abstract: A transmission system includes a plurality of nodes in which respective adjacent nodes are coupled by a first kind of optical fiber compatible with light in a first wavelength band or a second kind of optical fiber compatible with light in a second wavelength band, wherein each of the plurality of nodes includes a transmitting node that generates a wavelength-multiplexed optical signal in the first wavelength band by carrying out wavelength multiplexing of a plurality of optical signals and transmits the wavelength-multiplexed optical signal, a receiving node that demultiplexes the plurality of optical signals from the wavelength-multiplexed optical signal and receives the plurality of optical signals, and one or more relay nodes that relay the wavelength-multiplexed optical signal from the transmitting node to the receiving node through the first kind or the second kind of optical fiber.
    Type: Grant
    Filed: October 2, 2018
    Date of Patent: February 18, 2020
    Assignee: FUJITSU LIMITED
    Inventors: Shota Mori, Tooru Matsumoto
  • Patent number: 10563986
    Abstract: A waveguide optical gyroscope (WOG) is disclosed. One WOG may comprise an amplified spontaneous emission (ASE) source, a sensor comprising a waveguide loop disposed in a first cladding material interposed between layers of at least a second cladding material having an index of refraction lower than an index of refraction of the first cladding material, wherein the sensor is configured to receive an output signal of the ASE source, and a pump source configured to pump the first cladding material with an in-plane pump signal.
    Type: Grant
    Filed: January 17, 2017
    Date of Patent: February 18, 2020
    Assignee: LGS Innovations LLC
    Inventor: Inuk Kang
  • Patent number: 10567085
    Abstract: A wavelength tunable optical transmitter apparatus relates to the field of communications technologies and includes a plurality of multi-longitudinal mode lasers (1), a cyclic wavelength demultiplexer/multiplexer (2), and a reflector (3). The multi-longitudinal mode lasers output multi-longitudinal mode signals having a periodically repeated frequency interval, where the period is ?fmode. The cyclic wavelength demultiplexer/multiplexer performs periodically repeated filtering on the multi-longitudinal mode signals input by the multi-longitudinal mode lasers, to obtain single frequency signals, where a repetition period of a filter window is ?fband, ?fmode is different from ?fband, and ?fmode and ?fband are not in an integer-multiple relationship, and then, multiplexes the plurality of single frequency signals and outputs the multiplexed signal. The reflector reflects the multiplexed signal.
    Type: Grant
    Filed: July 27, 2018
    Date of Patent: February 18, 2020
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Jun Luo, Zhiyong Feng
  • Patent number: 10490974
    Abstract: A frequency comb generator including a semiconductor, wherein the semiconductor outputs a frequency comb in response to frequency mixing of an optical field and at terahertz field in the semiconductor using a high order sideband (HSG) mechanism. The frequency comb spans a bandwidth sufficient for self-referencing and may be used in optical clock applications, for example.
    Type: Grant
    Filed: March 30, 2018
    Date of Patent: November 26, 2019
    Assignee: The Regents of the University of California
    Inventors: Mark Sherwin, Hunter Banks, Darren Valovcin
  • Patent number: 10419149
    Abstract: An amplification device includes an element for splitting an input optical signal into first and second optical signals having first and second polarization modes, first and second amplification stages each including polarized SOAs for amplifying the first and second optical signals depending on driving currents, an intermediate processing stage for compensating optical characteristics of the optical gain bandwidth of the first amplification stage depending on driving currents, an element for combining the first and second optical signals outputted by the second amplification stage to produce an output optical signal, and a control means producing the driving currents depending on information representative of powers of the first and second optical signals before the polarized SOAs of each amplification stage and on a targeted power of the output optical signal.
    Type: Grant
    Filed: March 23, 2018
    Date of Patent: September 17, 2019
    Assignee: Alcatel Lucent
    Inventors: Jeremie Renaudier, Gabriel Charlet, Romain Brenot
  • Patent number: 10419122
    Abstract: A multiplexer/demultiplexer and a passive optical network system are provided. The multiplexer/demultiplexer includes N optical multiplexing/demultiplexing modules. The optical multiplexing/demultiplexing modules multiplex signals with different wavelengths from a plurality of ports to a same port, or demultiplex signals with different wavelengths from one port to different ports. The N optical multiplexing/demultiplexing modules correspond to the signals with different wavelengths. In the optical multiplexing/demultiplexing modules, a negative dispersion amount and an insertion loss of an Mth optical multiplexing/demultiplexing module are less than those of an (M+1)th optical multiplexing/demultiplexing module, where N is a positive integer, and M is a positive integer less than or equal to N. The multiplexer/demultiplexer and the passive optical network system increase an optical power budget between an optical transmitter and an optical transceiver.
    Type: Grant
    Filed: September 3, 2018
    Date of Patent: September 17, 2019
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Dekun Liu, Shengping Li
  • Patent number: 10401099
    Abstract: In one aspect, a transparent heat exchanger includes a first transparent substrate optically attached to a heat source, one or more fins to transfer heat from the heat source, the one or more fins comprising transparent material and further comprising one of a manifold coupled to the first transparent substrate or a facesheet coupled to the first transparent material.
    Type: Grant
    Filed: October 5, 2016
    Date of Patent: September 3, 2019
    Assignee: Raytheon Company
    Inventors: Christopher R. Koontz, David Filgas
  • Patent number: 10355784
    Abstract: A method for creating an optical binary digital transmit signal to be supplied to an optical transmission link including: operating an optical transmitter in such a state that mode hopping occurs between a predefined first and a predefined second optical mode of the optical transmitter if a binary digital modulation signal is supplied to the optical transmitter and creating a modulated optical output signal of the optical transmitter corresponding to the binary digital modulation signal supplied to the optical transmitter. The modulated optical output signal is optically filtered in such a way that at least a portion of the optical power spectrum of the modulated optical output signal caused by a selected one of the first and second optical modes is suppressed or at least substantially attenuated.
    Type: Grant
    Filed: August 24, 2017
    Date of Patent: July 16, 2019
    Assignee: ADVA Optical Networking SE
    Inventors: Michael Eiselt, Christoph Wagner
  • Patent number: 10290991
    Abstract: This solid laser amplification device has: a laser medium part that has a solid medium, into which a laser light enters from an entrance part and from which the laser light (L) is emitted to the outside from an exit part, and an amplification layer, which is provided on the surface of the medium, receives the laser light in the medium, and amplifies and reflects said light toward the exit part; a microchannel cooling part that cools the amplification layer; and a thermally conductive part that is provided so as to make contact between the amplification layer and the cooling part and transfers the heat of the amplification layer to the cooling part.
    Type: Grant
    Filed: June 8, 2016
    Date of Patent: May 14, 2019
    Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Yoshiyuki Kondo, Yuichi Otani, Yoshiteru Komuro, Atsushi Kodama, Koichi Hamamoto, Hiroyuki Daigo, Naoki Inoue, Tomoya Morioka, Masahiro Kato, Shingo Nishikata
  • Patent number: 10281652
    Abstract: An optical signal isolation device comprising a common port, an isolated diagnostic port, an integrated circulator comprising an input circulator fiber, an output circulator fiber, and a fiber-to-fiber optical coupler configured to couple an isolated optical signal propagating along the input circulator fiber to the output circulator fiber for propagation along the output circulator fiber, a multi-fiber alignment body that secures at least portions of each of the multi-signal fiber, the isolated diagnostic signal fiber, the input circulator fiber, and the output circulator fiber, and a wavelength-selective optical assembly including an optical signal filter, fiber-to-filter focusing optics, and a communications signal reflector. The integrated circulator and the wavelength selective optical assembly are configured such that the communications component is retro-reflected back to the common port and the diagnostic component is passes out of the isolated diagnostic port.
    Type: Grant
    Filed: June 29, 2017
    Date of Patent: May 7, 2019
    Assignee: Alliance Fiber Optic Products, Inc.
    Inventors: Chen Xia, Yao Li
  • Patent number: 10209135
    Abstract: The present invention relates to a measuring and compensating method for channel mismatch of an ultra-high speed time-wavelength interleaved optical pulse sequence, by employing a generating module of the to-be tested ultra-high speed time-wavelength interleaved optical pulse sequence, an optical spectrum measuring module, an electrical frequency measuring module, and a data analyzing and processing module. The present invention obtains mismatch information of the pulse sequence for each channel by means of measurement and analysis of the ultra-high speed time-wavelength interleaved optical pulse sequence, thus overcoming the bottleneck of inadequate sampling of time-domain observation via an oscilloscope. The channel mismatch information obtained by the present invention may act as a basis for channel mismatch compensation and correction for the ultra-high speed time-wavelength interleaved optical pulse sequence.
    Type: Grant
    Filed: October 30, 2014
    Date of Patent: February 19, 2019
    Assignee: Shanghai Jiao Tong University
    Inventors: Weiwen Zou, Guang Yang, Huajie Zhang, Jianping Chen
  • Patent number: 10205295
    Abstract: Apparatus and methods for altering one or more spectral, spatial, or temporal characteristics of a light-emitting device are disclosed. Generally, such apparatus may include a volume Bragg grating (VBG) element that receives input light generated by a light-emitting device, conditions one or more characteristics of the input light, and causes the light-emitting device to generate light having the one or more characteristics of the conditioned light.
    Type: Grant
    Filed: September 13, 2017
    Date of Patent: February 12, 2019
    Assignee: NECSEL INTELLECTUAL PROPERTY, INC.
    Inventors: Boris Leonidovich Volodin, Vladimir Sinisa Ban
  • Patent number: 10120211
    Abstract: An optical transmitter includes: a set of reflective silicon optical amplifiers (RSOAs), a set of ring modulators, a shared broadband reflector, a set of intermediate waveguides, and a shared waveguide. Each intermediate waveguide channels light from an RSOA in proximity to an associated ring modulator to cause optically coupled light to circulate in the associated ring modulator. The shared waveguide is coupled to the shared broadband reflector, and passes in proximity to the set of ring modulators, so that light circulating in each ring modulator causes optically coupled light to flow in the shared optical waveguide. During operation, each RSOA forms a lasing cavity with the shared broadband reflector, wherein each lasing cavity has a different wavelength, which is determined by a resonance of the associated ring modulator. The different wavelengths are combined in the shared waveguide to produce a combined output.
    Type: Grant
    Filed: November 8, 2016
    Date of Patent: November 6, 2018
    Assignee: Oracle International Corporation
    Inventors: Xuezhe Zheng, Ying Luo, Ashok V. Krishnamoorthy
  • Patent number: 10107986
    Abstract: The invention relates to a mockup with an optical transmission path, which optically connects the optical entrance to the optical exit, wherein an optical attenuator is arranged in the optical transmission path, wherein an optical condition of the transmission path is adjusted by means of the optical attenuator so that an optical transmission behavior of a wound optical fiber is simulated. The invention also relates to a mockup system, underwater vessel and/or sinker, a transfer mechanism, and a vessel, together with a training method with a mockup, which is deployed in an underwater vessel and/or in a sinker.
    Type: Grant
    Filed: June 26, 2015
    Date of Patent: October 23, 2018
    Assignee: ATLAS ELEKTRONIK GMBH
    Inventors: Detlef Lambertus, Dennis Meyer
  • Patent number: 10101577
    Abstract: A flash thermography device for generating an infrared image of a turbine component located inside a turbine, wherein the turbine includes at least one inspection port. The device includes a flash source that generates a light pulse that heats the turbine component and an infrared sensor for detecting thermal energy radiated by the turbine component. The device also includes a borescope having a sensor end, a viewing end that includes the flash source and an interior hollow that extends between the sensor and viewing ends. The borescope is positioned in the inspection port such that the viewing end is located inside the turbine. Thermal energy radiated from the turbine component is transmitted through the hollow to the infrared sensor to enable generation of the infrared image. The device further includes a reflector located on the viewing end that directs the light pulse toward the turbine component and a flash power supply for energizing the flash source.
    Type: Grant
    Filed: April 13, 2015
    Date of Patent: October 16, 2018
    Assignee: SIEMENS ENERGY, INC.
    Inventors: Arun Meenakshinatha Iyer, Anand A. Kulkarni, Kevin Licata
  • Patent number: 10096962
    Abstract: By compensating polarization mode-dispersion as well chromatic dispersion in photonic crystal fiber pulse compressors, high pulse energies can be obtained from all-fiber chirped pulse amplification systems. By inducing third-order dispersion in fiber amplifiers via self-phase modulation, the third-order chromatic dispersion from bulk grating pulse compressors can be compensated and the pulse quality of hybrid fiber/bulk chirped pulse amplification systems can be improved. Finally, by amplifying positively chirped pulses in negative dispersion fiber amplifiers, a low noise wavelength tunable seed source via anti-Stokes frequency shifting can be obtained.
    Type: Grant
    Filed: May 19, 2015
    Date of Patent: October 9, 2018
    Assignee: IMRA AMERICA, INC.
    Inventor: Martin E. Fermann
  • Patent number: 10082625
    Abstract: A system comprises a first optical component comprising a component body; at least a first waveguide formed in the component body, wherein the first waveguide is substantially mirror-symmetrical in shape relative to a line at or near the center of the first waveguide; and a self-alignment feature configured to assist in optically-coupling the first waveguide with a second waveguide located outside of the component body.
    Type: Grant
    Filed: September 5, 2017
    Date of Patent: September 25, 2018
    Assignee: International Business Machines Corporation
    Inventors: Russell A. Budd, Daniel M. Kuchta, Benjamin Giles Lee, Laurent Schares, Clint Lee Schow
  • Patent number: 10006766
    Abstract: Some embodiments of the invention relate to an electrooptical distance measuring device comprising light source, reception circuit comprising detector, in particular avalanche photodiode APD and control and evaluation component for deriving a distance to the target object. Some embodiments of the invention, the detector has at least two mutually independent reception segments for mutually independently generating a respective resultant electrical signal, wherein the reception segments are assigned to predefined or predefinable, in particular different, distance ranges to be measured. Furthermore, at least two independent amplifiers may be provided in the reception circuit. Some embodiments of the invention, therefore, for a reception segment which is assigned only to a lower distance range of comparatively near distances, an amplifier having a comparatively low gain factor can now be connected downstream, such that it is therefore possible as a result to avoid e.g.
    Type: Grant
    Filed: September 17, 2015
    Date of Patent: June 26, 2018
    Assignee: HEXAGON TECHNOLOGY CENTER GMBH
    Inventors: Jürg Hinderling, Julien Singer
  • Patent number: 9954339
    Abstract: There is provided a laser unit that may include: a master oscillator configured to output a linear-polarized laser light beam; a first polarization device disposed in a light path of the linear-polarized laser light beam and provided with a polarization axis substantially aligned with a polarization direction of the linearly-polarized incident laser light beam; a second polarization device disposed in the light path of the linear-polarized laser light beam and provided with a polarization axis substantially aligned with a direction of the polarization axis of the first polarization device; and a laser amplifier disposed between the first polarization device and the second polarization device in the light path of the linear-polarized laser light beam and including a pair of discharge electrodes disposed to oppose each other, an opposing direction of the pair of discharge electrodes being substantially aligned with the direction of the polarization axis of the first polarization device.
    Type: Grant
    Filed: February 10, 2016
    Date of Patent: April 24, 2018
    Assignee: Gigaphoton Inc.
    Inventors: Takashi Suganuma, Hakaru Mizoguchi, Osamu Wakabayashi
  • Patent number: 9871339
    Abstract: A laser transmitter is provided that includes a seed signal generator, an amplitude modulator and a power amplifier. The seed signal generator is configured to generate a seed signal that has a continuous waveform. The amplitude modulator is configured to generate a flat-top pulse signal based on the seed signal. The power amplifier is configured to generate a laser output signal based on the flat-top pulse signal.
    Type: Grant
    Filed: December 15, 2016
    Date of Patent: January 16, 2018
    Assignee: Raytheon Company
    Inventor: Fabio Di Teodoro
  • Patent number: 9825424
    Abstract: An object is to provide an optical device capable of relaxing a manufacturing condition for an optical waveguide used in the optical device. An optical device 500 is provided with an optical waveguide 200 including a core and a cladding optically joined together, and a temperature controller 600 that controls temperature of the optical waveguide, wherein the optical waveguide includes the core and the cladding formed such that a normalized frequency specified for light propagating through the optical waveguide changes across a cutoff frequency of a guided mode determined from a structure of the optical waveguide in a temperature range in which a refractive index of the core is higher than a refractive index of the clad. The temperature controller controls the temperature of the optical waveguide over a temperature range across temperature at which the normalized frequency equals to the cutoff frequency.
    Type: Grant
    Filed: January 9, 2015
    Date of Patent: November 21, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yojiro Watanabe, Takeshi Sakimura, Takayuki Yanagisawa
  • Patent number: 9817250
    Abstract: An optical modulator includes a plurality of nanostructures, each nanostructure of the plurality of nanostructures having a refractive index that is variable; a first insulation layer having a refractive index that is less than the individual refractive indexes of the plurality of nanostructures and surrounding the plurality of nanostructures; and a refractive index changer configured to change the refractive indexes of the plurality of nanostructures.
    Type: Grant
    Filed: April 18, 2016
    Date of Patent: November 14, 2017
    Assignees: SAMSUNG ELECTRONICS CO., LTD., CALIFORNIA INSTITUTE OF TECHNOLOGY
    Inventors: Seunghoon Han, Muhammad Zulfiker Alam, Harry Atwater
  • Patent number: 9793674
    Abstract: Apparatus and methods for altering one or more spectral, spatial, or temporal characteristics of a light-emitting device are disclosed. Generally, such apparatus may include a volume Bragg grating (VBG) element that receives input light generated by a light-emitting device, conditions one or more characteristics of the input light, and causes the light-emitting device to generate light having the one or more characteristics of the conditioned light.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: October 17, 2017
    Assignee: NECSEL INTELLECTUAL PROPERTY, INC.
    Inventors: Boris Leonidovich Volodin, Vladimir Sinisa Ban
  • Patent number: 9787395
    Abstract: An optical fiber cable of a mobile fronthaul system based on a radio over fiber (RoF), which includes a control apparatus for monitoring an analog optical link according to an exemplary embodiment, may be monitored. The monitoring control apparatus may include an optical signal monitor to monitor an optical signal passing through an optical fiber cable, and a system controller to control the optical signal based on a result of the monitoring. The optical signal monitor may calculate an average optical power, carrier-to-noise ratio (CNR), and a size of a nonlinear component from an electrical signal, which has been acquired from the optical signal. Then, the optical signal monitor may control the calculated average optical power, CNR, and nonlinear component.
    Type: Grant
    Filed: January 27, 2016
    Date of Patent: October 10, 2017
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Hwan Seok Chung, Seung Hyun Cho, Jong Hyun Lee, Sang Soo Lee, Chan Gyo Han
  • Patent number: 9762982
    Abstract: There is provided a multi-flow optical transceiver that includes (a) a plurality of wavelength-tunable light sources, (b) a plurality of optical modulation units which modulates light with an input signal, (c) an optical multiplexing/demultiplexing switch which couples light from at least one of the wavelength-tunable light sources to at least one of the optical modulation units with any power, (d) an optical coupling unit which couples a plurality of lights, modulated by a plurality of the optical modulation units, to at least one waveguide, (e) at least one multiple carrier generating unit which generates multiple carries, arranged at equal frequency intervals, from light of the wavelength-tunable light source, and (f) a wavelength separation unit which branches the multiple carriers from the multiple carrier generating unit for each wavelength.
    Type: Grant
    Filed: March 24, 2016
    Date of Patent: September 12, 2017
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Kazushige Yonenaga, Hidehiko Takara, Masahiko Jinno, Kohki Shibahara, Takashi Goh
  • Patent number: 9755739
    Abstract: A method of free-space optical communication includes guiding, by focusing optics, an optical communication beam emitted from an optical transmitter into a double-clad optical fiber. The optical communication beam carrying data. The double-clad optical fiber has first and second ends, where the first end is arranged to receive the optical communication beam. The double-clad optical fiber includes a fiber core, a first cladding, and a second cladding. The method also includes directing, by collimating optics, the optical communication beam from the second end of the double-clad optical fiber toward an optical receiver of a communication terminal. the second portion of the optical communication beam arranged concentrically around the first portion of the optical communication beam, the first portion of the optical communication beam having a higher intensity than the second portion of the optical communication beam.
    Type: Grant
    Filed: June 2, 2016
    Date of Patent: September 5, 2017
    Assignee: Google Inc.
    Inventors: Chiachi Wang, Michael Sholl
  • Patent number: 9755745
    Abstract: A device and a method for simultaneous full-duplex data and power transmission over a single optical waveguide, which connects a base station and a remote station. At the base station a high power laser source emits a first laser beam for carrying power and a base station low power laser source emits a second laser beam for carrying data over the optical waveguide from the base station to the remote station. An optical interface couples the laser beams into the optical waveguide. The laser beams are received at corresponding first and second remote station optical receivers. At the remote station, a third laser beam is emitted by a remote station low power laser source for carrying data from the remote station to the base station and the beam is received at the base station optical receiver. The wavelengths of the first, second and the third laser beams are distinct.
    Type: Grant
    Filed: October 18, 2013
    Date of Patent: September 5, 2017
    Assignee: Siemens Aktiengesellschaft
    Inventor: Michael Beck
  • Patent number: 9735532
    Abstract: A remote optically pumped amplifier in a multi-span optical communications link. A backwards Raman pump module performs backwards Raman amplification in an optical communications span that contains the remote optically pumped amplifier. A residual amount of backwards Raman pump power is then used to power the remote optically pumped amplifier. The remote optically pumped amplifier may be located 40 to 120 kilometers in optical distance from the backwards Raman pump module such that at least three milliwatts of residual Raman pump power is received by the remote optically pumped amplifier. The Raman pump module may be a multi-pump Raman pump module. A controller controls pump power provided by at least one of the pumps of the backwards Raman pump module, so as to at least partially compensate for optical signal strength versus wavelength variation introduced by the remote optically pumped amplifier and the backwards Raman pump module.
    Type: Grant
    Filed: March 4, 2015
    Date of Patent: August 15, 2017
    Assignee: Neptune Subsea IP Limited
    Inventors: Wayne S. Pelouch, Do-Il Chang
  • Patent number: 9728936
    Abstract: A method, system and an apparatus for hybrid optical and electrical pumping of semiconductor lasers and light-emitting diodes (LEDs) improves reliability at high operating temperatures. The semiconductor laser or LED is biased via optical pumping and a relatively small electrical modulation current modulates the laser. At low modulation speeds, the modulation current is substantially lower than that required for biasing the laser or directly modulating it at high speeds. The lifetime of the laser is improved by substantially reducing the operating current, enabling laser lifetimes adequate for operation in many applications, such as deep-hole oil drilling and jet engine control, where operation is not currently possible.
    Type: Grant
    Filed: December 19, 2013
    Date of Patent: August 8, 2017
    Assignee: ZEPHYR PHOTONICS INC.
    Inventor: Duane Louderback