Temporal Optical Modulation Within An Optical Waveguide Patents (Class 385/1)
  • Patent number: 10295738
    Abstract: An electro-optical modulator is provided. The modulator comprises a first and a second optical waveguide, at least one first capacitance, via which a voltage can be applied to a light-guiding region of the first optical waveguide, at least one second capacitance, via which a voltage can be applied to a light-guiding region of the second optical waveguide, an electrically conductive region, via which the first and second capacitances are electrically connected to one another, and a feed line to the electrically conductive region, via which feed line a DC voltage can be applied to the electrically conductive region, wherein the feed line is constituted such that it represents an electrical resistance connected in parallel with the second capacitance, and a compensation resistance connected in parallel with the first capacitance and serving for reducing transients in a voltage profile on the first and second capacitances during the operation of the modulator.
    Type: Grant
    Filed: December 21, 2015
    Date of Patent: May 21, 2019
    Assignee: FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
    Inventor: Heinz-Gunter Bach
  • Patent number: 10284288
    Abstract: A fiber link system, method and device for masking signals on a fiber link system. The system includes sending a desired sequence of information in the form of a true signal that is typically intended to be transferred between legitimate users at both ends of a link. Sending chaff signals, or subterfuge signals, alongside the true signal to mask such legitimate signals in the fiber cable from intruders tapping into the fiber cable.
    Type: Grant
    Filed: February 17, 2017
    Date of Patent: May 7, 2019
    Assignee: APRIORI NETWORK SYSTEMS, LLC
    Inventor: Gary M. Weiner
  • Patent number: 10277311
    Abstract: Systems and methods using a bi-directional Optical Time Domain Reflectometer (OTDR) to monitor a fiber optic communication system including a first node and a second node. The systems and methods include performing a first OTDR measurement at a first OTDR wavelength at the first node on a first fiber; performing a second OTDR measurement at a second OTDR wavelength at the second node on the first fiber; and utilizing the first OTDR measurement and the second OTDR measurement for event detection on the first fiber.
    Type: Grant
    Filed: November 17, 2017
    Date of Patent: April 30, 2019
    Assignee: Ciena Corporation
    Inventors: Jean-Luc Archambault, David W. Boertjes
  • Patent number: 10261385
    Abstract: A light modulation element constituted by a substrate type optical waveguide has a Mach-Zehnder interferometer; and a traveling wave electrode having a signal electrode arranged at least between a first phase modulator and a second phase modulator and electrically connected to both of the first phase modulator and the second phase modulator. A polarity of a semiconductor region of the first phase modulator connected to the signal electrode and a plurality of a semiconductor region of the second phase modulator connected to the signal electrode are different from each other.
    Type: Grant
    Filed: December 21, 2017
    Date of Patent: April 16, 2019
    Assignee: FUJIKURA LTD.
    Inventor: Kazuhiro Goi
  • Patent number: 10247850
    Abstract: A laser seismometer may measure the change in a phase modulated optical signal. Unlike traditional interferometers, the laser phase is first modulated by a radio frequency (RF) source, which is then demodulated following detection to provide the signal of interest. The net result is a direct measurement of displacement with the effects of amplitude noise eliminated via limiting and the effects of 1/f phase noise (frequency drift, etc.) eliminated by self-interfering the signal. Because the signal-to-noise ratio (SNR) of the optical signal is strong, the technique provides a strong measure of the displacement and avoids the extremely low voltages and associated problems of traditional sensors.
    Type: Grant
    Filed: September 20, 2017
    Date of Patent: April 2, 2019
    Assignee: Triad National Security, LLC
    Inventors: Stephen Judd, Gerald Seitz, Michael Shinas, Matthew Briggs
  • Patent number: 10236657
    Abstract: A device and method for tuning a ring resonator using self-heating stabilization is provided. A light source is controlled to produce an optical signal, input to an optical ring resonator, at a power where self-heating shifts a resonance wavelength of the optical ring resonator by at least 10 picometers, the self-heating comprising absorption in the optical ring resonator of optical power from a received optical signal. Prior to using the optical ring resonator at least one of modulate and filter the optical signal at the optical ring resonator, a heater of the optical ring resonator is controlled to an operating temperature at which the resonance wavelength of the optical ring resonator is greater than a respective wavelength of the optical signal.
    Type: Grant
    Filed: February 9, 2018
    Date of Patent: March 19, 2019
    Assignee: RANOVUS INC.
    Inventors: Bin Cao, Dylan Logan, Douglas J. S. Beckett, Rong Chen, Andrew Peter Knights
  • Patent number: 10215692
    Abstract: There is provided an optical waveguide structure, including a substrate, an insulating layer disposed on the substrate whereby the insulating layer includes an air slot formed therein, a first material layer suspended over the air slot whereby the first material layer constitutes a waveguide core of the optical waveguide structure, and a second material layer disposed over the waveguide core whereby the waveguide core is suspended over the air slot by the second material layer. There is also provided an optical gas sensor incorporating the optical waveguide structure and methods of fabrication thereof.
    Type: Grant
    Filed: October 16, 2015
    Date of Patent: February 26, 2019
    Assignee: Agency for Science, Technology and Research
    Inventors: Jifang Tao, Hong Cai, Alex Yuandong Gu, Hyun Kee Chang
  • Patent number: 10203525
    Abstract: Techniques for increasing efficiency of thermo-optic phase shifters using multi-pass heaters and thermal bridges are provided. In one aspect, a thermo-optic phase shifter device includes: a plurality of optical waveguides formed in an SOI layer over a buried insulator; at least one heating element adjacent to the optical waveguides; and thermal bridges connecting at least one of the optical waveguides directly to the heating element. A method for forming a thermo-optic phase shifter device is also provided.
    Type: Grant
    Filed: May 18, 2017
    Date of Patent: February 12, 2019
    Assignee: International Business Machines Corporation
    Inventors: Douglas M. Gill, Chi Xiong
  • Patent number: 10205531
    Abstract: A distributed traveling-wave Mach-Zehnder modulator driver having a plurality of modulation stages that operate cooperatively (in-phase) to provide a signal suitable for use in a 100 Gb/s optical fiber transmitter at power levels that are compatible with conventional semiconductor devices and conventional semiconductor processing is described.
    Type: Grant
    Filed: August 22, 2018
    Date of Patent: February 12, 2019
    Assignee: Elenion Technologies, LLC
    Inventors: Ran Ding, Thomas Wetteland Baehr-Jones, Michael J. Hochberg, Alexander Rylyakov
  • Patent number: 10197819
    Abstract: Techniques for increasing efficiency of thermo-optic phase shifters using multi-pass heaters and thermal bridges are provided. In one aspect, a thermo-optic phase shifter device includes: a plurality of optical waveguides formed in an SOI layer over a buried insulator; at least one heating element adjacent to the optical waveguides; and thermal bridges connecting at least one of the optical waveguides directly to the heating element. A method for forming a thermo-optic phase shifter device is also provided.
    Type: Grant
    Filed: December 29, 2017
    Date of Patent: February 5, 2019
    Assignee: International Business Machines Corporation
    Inventors: Douglas M. Gill, Chi Xiong
  • Patent number: 10200130
    Abstract: An optical transmitter includes: a splitter; a first optical modulator and a second optical modulator that modulate each of light beams split by the splitter; a first semiconductor optical amplifier (SOA) and a second SOA that are connected to a subsequent stage of the first optical modulator and a subsequent stage of the second optical modulator, respectively; a first detector and a second detector that detect light output intensity of the first SOA and light output intensity of the second SOA, respectively; a controller that sets gains of the first and second SOAs such that the first and second SOAs are equal in the light output intensity based on detection values of the first and second detectors; and a combiner that combines an output light beam of the first SOA and an output light beam of the second SOA.
    Type: Grant
    Filed: January 27, 2017
    Date of Patent: February 5, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shusaku Hayashi, Satoshi Nishikawa, Koichi Akiyama, Eiji Yagyu
  • Patent number: 10192857
    Abstract: According to an example of the present disclosure a direct bandgap (DBG) semiconductor structure is bonded to an assembly comprising a silicon photonics (SiP) wafer and a complementary metal-oxide-semiconductor (CMOS) wafer. The SiP wafer includes photonics circuitry and the CMOS wafer includes electronic circuitry. The direct bandgap (DBG) semiconductor structure is optically coupled to the photonics circuitry.
    Type: Grant
    Filed: October 31, 2016
    Date of Patent: January 29, 2019
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Marco Fiorentino, Di Liang, Geza Kurczveil, Raymond G Beausoleil
  • Patent number: 10194221
    Abstract: A high capacity node includes a plurality of receiver sections and a plurality of transmitter sections; and an electrical switching fabric between the plurality of receiver sections and the plurality of transmitter sections, wherein each of the plurality of receiver sections and the plurality of transmitter sections interface the electrical switching fabric at a full signal level and the electrical switching fabric is configured to perform flow switching on the full signal level between respective receiver sections and transmitter sections, and wherein the plurality of receiver sections, the plurality of transmitter sections, and one or more stages of the electrical switching fabric are implemented in one or more optoelectronic integrated circuits.
    Type: Grant
    Filed: December 6, 2017
    Date of Patent: January 29, 2019
    Assignee: Ciena Corporation
    Inventors: Michael Y. Frankel, John P. Mateosky, Michael H. Shahine, Joseph Berthold
  • Patent number: 10187157
    Abstract: To provide an optical transmitter module with simplified control of a voltage to be applied to an optical modulator. An optical transmitter module includes a semiconductor laser for irradiating a laser beam; a demultiplexer for branching the laser beam to output branched light beams; optical modulators for modulating an optical amplitude of each of the branched light beams into a first optical amplitude or a second optical amplitude, depending on an input level at two levels; and a multiplexer for multiplexing output light beams from the optical modulators. The optical transmitter module may include optical waveguides for connecting the optical modulators and the multiplexer, and the optical waveguides may include a first optical waveguide for causing a first phase difference and a second optical waveguide for causing a second phase difference different from the first phase difference.
    Type: Grant
    Filed: February 27, 2017
    Date of Patent: January 22, 2019
    Assignee: Oclaro Japan, Inc.
    Inventor: Kouji Nakahara
  • Patent number: 10187112
    Abstract: Various methods of detecting leakage of a signal from a Data-Over-Cable Service Interface Specification (DOCSIS) 3.1 channel are disclosed, including using a DOCSIS 3.1-defined “exclusion band” to insert existing tagger-based test carriers, using a power signature algorithm to detect the presence of DOCSIS 3.1-defined pilot carriers, and using a time-based correlation technique to detect the presence of DOCSIS 3.1-defined cyclic prefixes.
    Type: Grant
    Filed: February 4, 2016
    Date of Patent: January 22, 2019
    Assignee: Viavi Solutions, Inc.
    Inventors: Gary W. Sinde, Brett W. Emsley, Raleigh B. Stelle, IV, Mathew A. King
  • Patent number: 10172002
    Abstract: A method and device for transmitting product information using ultrasonic signals are disclosed. The device detects local availability of ultrasound-encoded product information while the device is at a location in proximity to an ultrasound transmitter. In response to detecting the local availability of the ultrasound-encoded product information, the device requests a user permission from a user of the device to capture the ultrasound-encoded product information. Upon obtaining the user permission to capture the ultrasound-encoded product information, the device receives, from the ultrasound transmitter, an ultrasonic signal encoded with a message containing respective information associated with a respective product. The device decodes the ultrasonic signal to obtain the message in a human-perceivable form.
    Type: Grant
    Filed: July 28, 2014
    Date of Patent: January 1, 2019
    Assignee: TENCENT TECHNOLOGY (SHENZHEN) COMPANY LIMITED
    Inventor: Chang He
  • Patent number: 10168476
    Abstract: Disclosed herein are techniques, methods, structures and apparatus for providing photonic structures and integrated circuits with optical gratings disposed within cladding layer(s) of those structures and circuits.
    Type: Grant
    Filed: November 22, 2016
    Date of Patent: January 1, 2019
    Assignee: Acacia Communications, Inc.
    Inventors: Christopher Doerr, Diedrik Vermeulen
  • Patent number: 10140932
    Abstract: A luminaire includes a light waveguide grid including an array of waveguides coupling respective illumination light source emitters of a general illumination device with respective gaps between respective pixel light emitters of an image display device. Each waveguide has a housing that includes an input interface optically coupled to the respective illumination light source emitter to steer illumination lighting from the illumination light source emitter. The housing also includes an output interface opposing the input interface and optically coupled to one or more gaps between pixel light emitters. The housing further includes at least one reflective wall having an internal reflective surface encompassing and extending from the input interface and the output interface. The structure of the waveguide may be optimized and/or additional technologies added to reduce optical losses and improve overall illumination efficiency of the luminaire.
    Type: Grant
    Filed: March 24, 2017
    Date of Patent: November 27, 2018
    Assignee: ABL IP Holding LLC
    Inventors: Ravi Kumar Komanduri, David P. Ramer, Guan-Bo Lin
  • Patent number: 10133098
    Abstract: A metal-oxide semiconductor (MOS) optical modulator including a doped semiconductor layer having a waveguide structure, a dielectric layer disposed over the waveguide structure of the doped semiconductor layer, a gate region disposed over the dielectric layer, wherein the gate region comprises a transparent electrically conductive material having a refractive index lower than that of silicon, and a metal contact disposed over the gate region. The metal contact, the gate region, and the waveguide structure of the doped semiconductor layer may be vertically aligned with each other.
    Type: Grant
    Filed: April 17, 2015
    Date of Patent: November 20, 2018
    Assignee: Futurewei Technologies, Inc.
    Inventors: Hongmin Chen, Qianfan Xu, Li Yang, Xiao Shen, Dawei Zheng, Yusheng Bai, Hongbing Lei, Eric Dudley
  • Patent number: 10128942
    Abstract: The described method relates to fiber optic communication engineering and can be used in fiber optic communication systems for creating several independent communication channels. One object of the method is to increase the utilization efficiency of the optic fibers by using optical signals transmitted in opposite directions at one wavelength.
    Type: Grant
    Filed: November 4, 2016
    Date of Patent: November 13, 2018
    Inventor: Sergeev Sergey Nikolaevich
  • Patent number: 10120214
    Abstract: Disclosed herein are techniques for determining the position of a light beam on a beam shaping device. A feature can be formed on the beam shaping device to affect at least a portion of a light beam when the feature is illuminated by the light beam. When the light beam is directed onto the feature on the beam shaping device, a feature detection signal may be generated by a detector in response to detecting at least the portion of the light beam affected by the feature that has been illuminated by the light beam. The position of the light beam on the beam shaping device at a time instant can then be determined based, at least in part, on the feature detection signal.
    Type: Grant
    Filed: June 24, 2016
    Date of Patent: November 6, 2018
    Assignee: QUALCOMM Incorporated
    Inventors: Linda Irish, Russell Gruhlke, Manav Raina
  • Patent number: 10090921
    Abstract: A light modulation device detects a power of the modulated optical signal modulated by each of an I-component optical modulator and a Q-component optical modulator, synchronously-detects a component of a frequency fd from the power of the modulated optical signal, outputs a dither signal of a frequency fd/n (where n is a positive integer equal to or larger than 1) applied to a first bias voltage or a second bias voltage when adjusting the first bias voltage or the second bias voltage, outputs two dither signals having a frequency fd/m (where m is a positive integer equal to or larger than 1, where n<m), which are mutually orthogonal to each other, applied to the first and second bias voltages when adjusting a third bias voltage, and adjusting bias voltages by increasing or decreasing bias voltages based on a synchronous detection result.
    Type: Grant
    Filed: April 10, 2015
    Date of Patent: October 2, 2018
    Assignees: Nippon Telegraph And Telephone Corporation, NTT Electronics Corporation
    Inventors: Mikio Yoneyama, Hiroto Kawakami, Takashi Ono, Akihiko Matsuura, Tomoyoshi Kataoka, Katsuya Tanaka, Masahiro Tachibana, Yuya Oyama
  • Patent number: 10067290
    Abstract: A polarization scrambler based on Faraday magneto-optic effect is disclosed. A polarization control unit (2) is connected between a first rotator unit (1) and a second rotator unit (3). The first rotator unit (1) includes a first optical fiber circle (11) and a first wire coil (12). The second rotator unit (3) includes a second optical fiber circle (31) and a second wire coil (32). ACs with two frequencies f1 and f2 are respectively introduced into the first wire coil (12) and the second wire coil (32), such that the ACs in the two wire coils are changed to control the polarization angle in the two optical fiber circles to independently change within the range of +/?90°. The polarization control unit (2) can ensure motion trajectories of outputted light polarization pointsare in two orthogonal directions, thus achieving uniform polarization disturbance.
    Type: Grant
    Filed: May 25, 2017
    Date of Patent: September 4, 2018
    Assignees: Beijing Qi-Red PhotoElectric Technology Co., Ltd., Zibo Qi-Red PhotoElectric Technology Co.,Ltd.
    Inventors: Shudong Wu, Wenbo Wang
  • Patent number: 10063323
    Abstract: In accordance with an example embodiment of the present invention, there is provided an apparatus comprising a dual-rail encoder (120) configured to receive light from a light source and to output dual-rail encoded light, a combiner (130) configured to convert the dual-rail encoded light into polarization encoded light, and at least one processing core configured to obtain compensation adjustment information concerning a fiber (145) and to control the dual-rail encoder (120) based at least in part on the compensation adjustment information.
    Type: Grant
    Filed: June 9, 2014
    Date of Patent: August 28, 2018
    Assignee: Nokia Technologies Oy
    Inventors: David Bitauld, Joachim Wabnig, Antti Niskanen, Hongwei Li
  • Patent number: 10031355
    Abstract: The optical device includes a waveguide positioned on a base and a modulator positioned on the base. The modulator includes a ridge of an electro-absorption medium having a top side and a lateral side. The lateral side is between the top side and the base and the top side has a width. The waveguide is configured to guide a light signal through the modulator such that the light signal is guided through the ridge of electro-absorption medium. A heater is positioned over the lateral side of the electro-absorption medium without being positioned over the entire width of the ridge.
    Type: Grant
    Filed: August 29, 2017
    Date of Patent: July 24, 2018
    Assignee: Mellanox Technologies Silicon Photonics Inc.
    Inventors: Dazeng Feng, Cheng-Chih Kung, Jacob Levy, Wei Qian, Wei Liu, Mehdi Asghari
  • Patent number: 10027419
    Abstract: A memory system includes a memory controller, a plurality of memory modules, and a memory bus connecting the memory controller and the plurality of memory modules. The memory bus includes at least one polarization-controlled optical channel configured to control a polarization of transmission light in response to a plurality of selection signals in order to transfer the transmission light to a target memory module among the plurality of memory modules. The transmission light is linearly-polarized light provided from the memory controller, and the plurality of selection signals correspond to the plurality of memory modules, respectively.
    Type: Grant
    Filed: December 31, 2014
    Date of Patent: July 17, 2018
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Amir Hossein Nejadmalayeri, Yoon-Dong Park
  • Patent number: 10024697
    Abstract: A method using wavelength division multiplexing for reducing light diffusion and light reflection interference in an interference path, comprising: connecting a wavelength division multiplexer (10) serially at an end of a sensing optical fiber (6); using the wavelength division multiplexer (10) to extract a wavelength component from a working path for measuring an interfering signal caused by light diffusion and light reflection; using the signal as a reference to extract an effective signal component that has been interfered by light diffusion and light reflection, and obtaining a pure effective signal. Because the device connected at the end of the sensing optical fiber (6) is passive and requires no power, the system is easy to implement and is particularly suitable for situations in which power provision is difficult at the end of the sensing optical fiber (6). The method is suitable for long distance pipeline monitoring and a wide-range optical of fiber perimeter security.
    Type: Grant
    Filed: October 10, 2014
    Date of Patent: July 17, 2018
    Assignee: FUDAN UNIVERSITY
    Inventors: Qian Xiao, Bo Jia, Pang Bian
  • Patent number: 9989704
    Abstract: Embodiments of present invention provide a digital dispersion compensation module. The digital dispersion compensation module includes a multi-port optical circulator and a plurality of dispersion compensation units connected to the multi-port optical circulator, wherein at least one of the plurality of dispersion compensation units includes a first and a second reflectively terminated element and an optical switch being capable of selectively connecting to one of the first and second reflectively terminated elements, and wherein the at least one of the plurality of dispersion compensation units is adapted to provide a substantially zero dispersion to an optical signal, coming from the multi-port optical circulator, when the optical switch connects to the first reflectively terminated element and is adapted to provide a non-zero dispersion to the optical signal when the optical switch connects to the second reflectively terminated element.
    Type: Grant
    Filed: June 27, 2016
    Date of Patent: June 5, 2018
    Assignee: LUXAR TECH INC
    Inventors: Tongqing Wang, Dobby Lam, Jinghui Li, Ming Ding
  • Patent number: 9989831
    Abstract: A device includes an optical splitter comprising a plurality of splitter outputs. The splitter outputs are out of phase and include a non-uniform phase front. The device includes a one-dimensional phase compensation array communicating with the optical splitter. The phase compensation array receives the non-uniform phase front and outputs a uniform phase front. The phase compensation array includes a plurality of array outputs. The device includes a tunable linear gradient phase shifter communicating with said phase compensation array to impart a linearly-varying phase shift across said plurality of array outputs, thereby steering a beam along a first angle in a first plane. The device includes a waveguide grating out-coupler communicating with said linear gradient phase shifter, and a uniform phase shifter communicating with the waveguide grating out-coupler. The uniform phase shifter steers the flat phase front along a second angle in a second plane perpendicular to said first plane.
    Type: Grant
    Filed: March 2, 2017
    Date of Patent: June 5, 2018
    Assignee: The United States of America, as represented by the Secretary of the Navy
    Inventors: Marcel W. Pruessner, William S. Rabinovich, Rita Mahon, Peter G. Goetz
  • Patent number: 9964703
    Abstract: Described are various configurations of integrated wavelength lockers including asymmetric Mach-Zehnder interferometers (AMZIs) and associated detectors. Various embodiments provide improved wavelength-locking accuracy by using an active tuning element in the AMZI to achieve an operational position with high locking sensitivity, a coherent receiver to reduce the frequency-dependence of the locking sensitivity, and/or a temperature sensor and/or strain gauge to computationally correct for the effect of temperature or strain changes.
    Type: Grant
    Filed: August 29, 2017
    Date of Patent: May 8, 2018
    Assignee: Juniper Networks, Inc.
    Inventors: John Parker, Jared Bauters, Jonathan Edgar Roth, Erik Norberg, Gregory Alan Fish
  • Patent number: 9960854
    Abstract: A method of operating a BPSK modulator includes receiving an RF signal at the BPSK modulator and splitting the RF signal into a first portion and a second portion that is inverted with respect to the first portion. The method also includes receiving the first portion at a first arm of the BPSK modulator, receiving the second portion at a second arm of the BPSK modulator, applying a first tone to the first arm of the BPSK modulator, and applying a second tone to the second arm of the BPSK modulator. The method further includes measuring a power associated with an output of the BPSK modulator and adjusting a phase applied to at least one of the first arm of the BPSK modulator or the second arm of the BPSK modulator in response to the measured power.
    Type: Grant
    Filed: September 23, 2016
    Date of Patent: May 1, 2018
    Assignee: Skorpios Technologies, Inc.
    Inventors: Stephen B. Krasulick, Timothy Creazzo, Kalpit Jha, Elton Marchena, Amit Mizrahi
  • Patent number: 9954618
    Abstract: An apparatus includes an optical data modulator, an electrical tuner located to control an operating wavelength of the optical data modulator, a photo-sensitive diode or photo-sensitive transistor, and an electronic feedback controller. The photo-sensitive diode or photo-sensitive transistor is connected to receive light from an optical output of the optical data modulator and is configured to output an electrical signal representative of a measured intensity of said received light. The electronic feedback controller is connected to receive the electrical signal from the optical intensity detector and to operate said electrical tuner based on an alternating current component of said measured intensity.
    Type: Grant
    Filed: March 17, 2017
    Date of Patent: April 24, 2018
    Assignee: Alcatel-Lucent USA Inc.
    Inventors: Po Dong, Xi Chen
  • Patent number: 9946099
    Abstract: Techniques for increasing efficiency of thermo-optic phase shifters using multi-pass heaters and thermal bridges are provided. In one aspect, a thermo-optic phase shifter device includes: a plurality of optical waveguides formed in an SOI layer over a buried insulator; at least one heating element adjacent to the optical waveguides; and thermal bridges connecting at least one of the optical waveguides directly to the heating element. A method for forming a thermo-optic phase shifter device is also provided.
    Type: Grant
    Filed: May 16, 2017
    Date of Patent: April 17, 2018
    Assignee: International Business Machines Corporation
    Inventors: Douglas M. Gill, Chi Xiong
  • Patent number: 9923631
    Abstract: The invention introduces a new RF test and measurement methodology based on optical signal processing that has the capability to measure all of the RF parameters (both amplitude and phase) of an electronic component or system including transmission (S21) and reflection (S11). It can also be applied to measuring the electro-optic properties of electro-optic modulators, both phase modulators and intensity modulators. The basis of the invention is to use the RF information encoded in the optical sidebands generated by an electro-optic modulator to determine all of the relevant parameters of an electronic or electro-optic device. Optical carrier suppression techniques are used to isolate the information carrying optical sidebands from the dominant optical carrier.
    Type: Grant
    Filed: March 31, 2015
    Date of Patent: March 20, 2018
    Assignee: EOSpace Inc.
    Inventors: David Emil Moilanen, Matthew Allen Hall
  • Patent number: 9904248
    Abstract: The current invention concerns a fluid microscope system for analyzing and/or monitoring the contents of one or more fluid-based reactors or canalizations such as bio-reactors, micro-reactors, brewing reactors, water supply systems or sewer systems comprising a digital holographic microscope (DHM) capable of obtaining phase information of a fluid sample and comprising illumination means and one or more fluidic systems connected to said reactors and to said DHM, capable of guiding fluid from said reactors to said DHM, whereby at least one fluidic system comprises one or more tubes which may come in direct contact with fluid from said reactor, characterized in that at least one tube comprises a part which is at least partially transparent for the illumination means of said DHM for obtaining holographic information of said fluid sample. The current invention also concerns a tube and a fluidic system for such a fluid microscope.
    Type: Grant
    Filed: September 20, 2013
    Date of Patent: February 27, 2018
    Assignee: Ovizio Imaging Systems NV/SA
    Inventors: Philip Mathuis, Serge Jooris
  • Patent number: 9893219
    Abstract: According to one embodiment, a graphene photodetector includes a substrate, a first insulating film, first and second high-refractive-index regions, first and second conductive semiconductor regions, a second insulating film, a graphene film, a third insulating film, third and fourth high-refractive-index regions, a fourth insulating film, first and second electrodes, and third and fourth electrodes. The first, second, third and fourth high-refractive-index regions and portions sandwiched by the first, second, third and fourth high-refractive-index regions constituting an integrated optical waveguide.
    Type: Grant
    Filed: December 4, 2015
    Date of Patent: February 13, 2018
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Nobuo Suzuki, Yuichi Yamazaki
  • Patent number: 9880356
    Abstract: Tapered waveguides made of high-index material attached to a tapered optical fiber are provided, enabling access to the optical modes of large, high-index resonators. In some embodiments, an optical fiber having a central axis, a tapered portion, and an untapered portion is provided. The tapered portion is configured to expose an evanescent field. An elongated waveguide is optically coupled to the optical fiber along the tapered portion and parallel to the central axis of the optical fiber. The elongated waveguide has a substantially triangular cross section perpendicular to the central axis of the optical fiber.
    Type: Grant
    Filed: May 10, 2016
    Date of Patent: January 30, 2018
    Assignee: PRESIDENT AND FELLOWS OF HARVARD COLLEGE
    Inventors: Pawel M. Latawiec, Marko Loncar
  • Patent number: 9847840
    Abstract: A laser module can include: a laser chip having a plurality of laser diodes; a focusing lens optically coupled to each of the plurality of distinct laser diodes; and a photonic integrated circuit (PIC) having a plurality of optical inlet ports optically coupled to the plurality of laser diodes through the focusing lens. The laser module can include an optical isolator optically coupled to the focusing lens and PIC and positioned between the focusing lens and PIC. The laser chip can include a fine pitch laser array. The laser module can include a plurality of optical fibers optically coupled to an optical outlet port of the PIC. The laser module can include a hermetic package containing the laser chip and having a single focusing lens positioned for the plurality of laser diodes to emit laser beams there through.
    Type: Grant
    Filed: March 17, 2014
    Date of Patent: December 19, 2017
    Assignee: FINISAR CORPORATION
    Inventors: Xiaojie Xu, Mark Donovan
  • Patent number: 9841347
    Abstract: A reflectivity test circuit is described. The reflectivity test circuit includes a symmetric structure that cancels errors in the reflectivity measurements. In particular, the reflectivity test circuit includes an optical waveguide that is optically coupled to two optical ports and two optical couplers. The optical couplers are optically coupled to adjacent optical waveguides, at least one of which is optically coupled to a third optical port and the mirror. Moreover, a length of the optical waveguide is chosen to match the round-trip optical path length in at least the one of the adjacent optical waveguides. During operation, control logic determines the reflectivity of the mirror based at least on a ratio of an optical power measured on one of the two optical ports to an input optical power on the third optical port.
    Type: Grant
    Filed: November 20, 2015
    Date of Patent: December 12, 2017
    Assignee: ORACLE INTERNATIONAL CORPORATION
    Inventors: Jock T. Bovington, Xuezhe Zheng
  • Patent number: 9823417
    Abstract: Disclosed is a waveguide polarizing optical device, including a first waveguide polarizer (6), a section of a second optical waveguide (31) and a second thin-plate polarizer (52) having a physical thickness T and a refractive index n, the second thin-plate polarizer (52) being disposed on the optical path between a waveguide end (8) of the first polarizer (6) and one end (32) of the second optical waveguide (31), the physical distance d between the waveguide end (8) of the first polarizer (6) and the end (32) of the second optical waveguide (31) being less than or equal to twice the Rayleigh length and the physical thickness T of the second polarizer (52) being less than or equal to the physical distance d.
    Type: Grant
    Filed: July 6, 2015
    Date of Patent: November 21, 2017
    Assignee: IXBLUE
    Inventors: Pascal Simonpietri, Stephane Chouvin, Cedric Molucon
  • Patent number: 9800326
    Abstract: There is provided an optical transmission device including a light source configured to generate light used for coherent detection processing of reception light; a monitor configured to monitor a frequency offset between the reception light having a plurality of protection wavelengths and the light generated by the light source, based on a signal obtained by the coherent detection processing of the reception light having the plurality of protection wavelengths available for a work wavelength by the light generated by the light source; and a controller configured to select a protection wavelength to be switched to the work wavelength among the plurality of protection wavelengths, based on the frequency offset monitored by the monitor.
    Type: Grant
    Filed: July 7, 2016
    Date of Patent: October 24, 2017
    Assignee: FUJITSU LIMITED
    Inventors: Takuma Shoji, Takashi Honda, Masashige Kawarai, Satoru Saitoh
  • Patent number: 9778494
    Abstract: The optical device includes a waveguide positioned on a base and a modulator positioned on the base. The modulator includes a ridge of an electro-absorption medium having a top side and a lateral side. The lateral side is between the top side and the base and the top side has a width. The waveguide is configured to guide a light signal through the modulator such that the light signal is guided through the ridge of electro-absorption medium. A heater is positioned over the lateral side of the electro-absorption medium without being positioned over the entire width of the ridge.
    Type: Grant
    Filed: March 16, 2016
    Date of Patent: October 3, 2017
    Assignee: Mellanox Technologies Silicon Photonics Inc.
    Inventors: Dazeng Feng, Cheng-Chih Kung, Jacob Levy, Wei Qian, Wei Liu, Mehdi Asghari
  • Patent number: 9759862
    Abstract: The various presented herein relate to an on-chip polarization beam splitter (PBS), which is adiabatic for the transverse magnetic (TM) mode and diabatic for the transverse electric (TE) mode. The PBS comprises a through waveguide and a cross waveguide, wherein an electromagnetic beam comprising TE mode and TM mode components is applied to an input port of the through waveguide. The PBS can be utilized to separate the TE mode component from the TM mode component, wherein the TE mode component exits the PBS via an output port of the through waveguide, and the TM mode component exits the PBS via an output port of the cross waveguide. The PBS has a structure that is tolerant to manufacturing variations and exhibits high polarization extinction ratios over a wide bandwidth.
    Type: Grant
    Filed: October 10, 2016
    Date of Patent: September 12, 2017
    Assignee: National Technology & Engineering Solutions of Sandia, LLC
    Inventors: Christopher DeRose, Hong Cai
  • Patent number: 9746742
    Abstract: An electro-optic modulator includes a Mach-Zehnder interferometer having a bias input, an optical input, and an optical output. A first arm comprises an optical waveguide. A second arm comprises an optical waveguide. A plurality of electrode segments is distributed along or proximate to a length of the optical waveguides of the first and second arms. A plurality of amplifiers, where at least one of the plurality of amplifiers has an RF input that receives an electrical modulation signal, and where each of the plurality of amplifiers are electrically connected to one of the plurality of electrode segments so as to provide distributed gain. A number of the plurality of amplifiers is chosen to achieve a desired combination of noise figure and spur-free dynamic range.
    Type: Grant
    Filed: December 28, 2014
    Date of Patent: August 29, 2017
    Assignee: Photonic Systems, Inc.
    Inventors: Charles H. Cox, Edward I. Ackerman
  • Patent number: 9746744
    Abstract: A method of forming a waveguide for a self-aligned Mach-Zehnder-Interferometer. The method includes forming a waveguide on a substrate and providing a first mask with a first opening exposing a first width and a pair of second widths towards opposite sides of the first width. Additionally, the method includes doping a first dopant of a first concentration through the first opening into a first thickness of the waveguide to form a first semiconducting phase thereof. The method includes providing a second mask with a second opening exposing part of the waveguide and doping a second dopant of a second concentration through the second opening into the part of the waveguide to form a second semiconductor phase thereof sharing a boundary with the first semiconducting phase to form a PN junction across the boundary. The boundary is allowed to vary with a margin of tolerance within the first width.
    Type: Grant
    Filed: May 31, 2017
    Date of Patent: August 29, 2017
    Assignee: INPHI CORPORATION
    Inventors: Jie Lin, Masaki Kato, Robb Johnson
  • Patent number: 9748736
    Abstract: This disclosure provides systems, methods, and apparatus related to nanometer scale lasers. In one aspect, a device includes a substrate, a line of metal disposed on the substrate, an insulating material disposed on the line of metal, and a line of semiconductor material disposed on the substrate and the insulating material. The line of semiconductor material overlaying the line of metal, disposed on the insulating material, forms a plasmonic cavity.
    Type: Grant
    Filed: October 11, 2013
    Date of Patent: August 29, 2017
    Assignee: The Regents of The University of California
    Inventors: Ren-min Ma, Xiang Zhang
  • Patent number: 9749054
    Abstract: Aspects of embodiments relate to an optical transceiver device, comprising: a detection region for detecting light at a first wavelength for down-conversion; and a modulation region for modulating light at a second wavelength longer than the first wavelength, wherein the detection region is substantially transparent to light at the second wavelength and located upstream to the modulation with respect to direction of propagation of first wavelength light incident onto the detection region.
    Type: Grant
    Filed: July 23, 2015
    Date of Patent: August 29, 2017
    Assignee: Mer-Cello Wireless Solutions Ltd.
    Inventors: Yossef Ben Ezra, Yaniv Ben Haim
  • Patent number: 9733498
    Abstract: An optical modulator is described. This optical modulator may be implemented using silicon-on-insulator (SOI) technology. In particular, the optical modulator may include a carrier-accumulation-type micro-disk resonator fabricated using optical waveguides having a composite structure. Moreover, the composite structure may embed a metal-oxide semiconductor capacitor in the disk resonator. For example, the composite structure may include polysilicon disposed on an oxide layer, which is disposed on a silicon layer in an SOI platform. The optical modulator may have high modulation efficiency and high-speed operation. In addition, the optical modulator may have a compact footprint with low power consumption.
    Type: Grant
    Filed: October 9, 2015
    Date of Patent: August 15, 2017
    Assignee: ORACLE INTERNATIONAL CORPORATION
    Inventors: Ying Luo, Xuezhe Zheng, Shiyun Lin, Ashok V. Krishnamoorthy
  • Patent number: 9735904
    Abstract: A transmitter for a radio frequency interconnect (RFI) includes a carrier generator configured to generate a clock recovery signal, and to transmit the clock recovery signal to a receiver. The carrier generator includes a first tuning arrangement configured to receive a first signal and to generate a first carrier signal based on the first signal. The carrier generator includes a second tuning arrangement configured to receive a second signal different from the first signal, and to generate a second carrier signal based on the second signal. The transmitter includes a first modulator configured to generate a first modulated data signal. The transmitter further includes a second modulator configured to generate a second modulated data signal. The transmitter includes an output configured to selectively transmit the first modulated data signal and the second modulated data signal to the receiver.
    Type: Grant
    Filed: December 15, 2015
    Date of Patent: August 15, 2017
    Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY, LTD.
    Inventors: Feng Wei Kuo, Chewn-Pu Jou, Huan-Neng Chen, Lan-Chou Cho, Willaim Wu Shen
  • Patent number: 9726914
    Abstract: Preferable simultaneous achievement of the target characteristics with respect to both of the modulation bandwidth and the extinction ratio in the optical intensity modulation using the electro-absorption optical modulator is realized with a simple circuit configuration. The modulator integrated semiconductor laser element includes a plurality of EA modulators disposed in series in an optical signal path, and each adapted to absorb light in accordance with an applied voltage. The modulator driver for supplying the EA modulator with the applied voltage is provided for each of the EA modulators. The plurality of modulator drivers generates the applied voltage common to the plurality of EA modulators in accordance with a control signal. The modulator lengths of the plurality of EA modulators are set so that the closer to the light source the EA modulator is, the shorter the modulator length is.
    Type: Grant
    Filed: June 6, 2016
    Date of Patent: August 8, 2017
    Assignee: OCLARO JAPAN, INC.
    Inventors: Atsushi Nakamura, Shunya Yamauchi, Noriko Sasada, Takayoshi Fukui, Nozomu Yasuhara