Using Fiber Or Waveguide Interferometer Patents (Class 356/477)
  • Patent number: 11327384
    Abstract: An optical resonant modulator based on coupling modulation, comprising a resonant structure with an embedded Mach-Zehnder interferometer that is differentially driven to induced amplitude modulation at the output port. The principle of coupling modulation enables high data/baud rates to be achieved in a photonic integrated circuit, e.g. silicon, footprint that is considerably smaller than that of a conventional traveling-wave Mach-Zehnder modulator, in particular by utilizing space saving features, such as ring resonator phase shifters and bend waveguide arms.
    Type: Grant
    Filed: August 10, 2020
    Date of Patent: May 10, 2022
    Assignee: Nokia Solutions and Networks Oy
    Inventors: Ajay Mistry, Meisam Bahadori, Matthew Streshinsky, Yangjin Ma
  • Patent number: 11307104
    Abstract: The invention relates to a method for optically sensing a parameter of the group of temperature, humidity or mechanical stress using at least one optical sensor which includes a chirped Bragg grating and an optical reference reflector.
    Type: Grant
    Filed: March 27, 2020
    Date of Patent: April 19, 2022
    Assignee: ADVA Optical Networking SE
    Inventors: Michael Eiselt, Florian Azendorf
  • Patent number: 11307355
    Abstract: A 90-degree optical hybrid includes two optical splitters that respectively split inputted light into two beams, two optical combiners that respectively combine two beams of inputted light and thereby output two beams of interfering light respectively, and four arm waveguides that input light splitted by any of the two optical splitters into any of the two optical combiners. Each of the four arm waveguides has a bend waveguide arranged at its center and a plurality of optical waveguides including a tapered waveguide having a width that decreases toward the bend waveguide. Both ends of each of the plurality of optical waveguides are respectively in contact with a end surface of any one of the two optical splitter, the two optical combiners, the bend waveguide and the other of the plurality of optical waveguides, and each of the plurality of waveguides is the tapered waveguide or a linear waveguide.
    Type: Grant
    Filed: February 18, 2021
    Date of Patent: April 19, 2022
    Assignee: FUJITSU OPTICAL COMPONENTS LIMITED
    Inventor: Akira Oka
  • Patent number: 11293833
    Abstract: The deep penetration of optical transmission from the very edges of the network with optical access networks to the very core with routing data within data centers before transmission has resulted in competing demands for increased functionality, reduced cost, enhanced manufacturability, and reduced footprint. At the same time monitoring and fault detection with prior art optical time domain reflectometry systems have not kept up to the demands of these networks and systems as they are expensive test equipment based solutions. It would be beneficial to provide embedded OTDR functionality within each transmitter, receiver or transceiver deployed within the network allowing every link to be monitored continuously. It would be further beneficial for such embedded OTDRs to meet the demands for lower cost, high volumes, and smaller footprints with enhanced manufacturability.
    Type: Grant
    Filed: February 18, 2015
    Date of Patent: April 5, 2022
    Assignee: VISCORE TECHNOLOGY INC.
    Inventors: Yunqu Liu, Kin-Wai Leong
  • Patent number: 11280973
    Abstract: An apparatus includes a base having walls that define a track. The track has input and output ends and defines a coiled path that spirals inward from the input end, reaches an inflection point where a direction of curvature is reversed, and spirals outward towards the output end. The track is configured to receive and maintain a majority of an optical fiber in an at least substantially planar coiled arrangement. The apparatus also includes a first transition arm positioned at the input end and a second transition arm positioned at the output end. Each transition arm is configured to be mechanically coupled to the base and includes a groove configured to receive and maintain a portion of the optical fiber in an at least substantially straight orientation. The walls and transition arms are configured to maintain thermal contact with the optical fiber along its entire length.
    Type: Grant
    Filed: June 1, 2020
    Date of Patent: March 22, 2022
    Assignee: Raytheon Company
    Inventors: David A. Rockwell, Friedrich P. Strohkendl, Ray McVey
  • Patent number: 11271646
    Abstract: The disclosed systems and methods are directed to monitor optical performance comprising receiving optical channel signals, wherein the optical channel signals are superimposed with pilot tone (PT) signals, operating a local oscillator (LO) including a tunable laser in a coarse scanning mode and a fine scanning mode and generate different LO signals in accordance with the mode in which the LO is being operated, combining the optical channel signals with at least one LO signal generated by the LO and generating a combined optical signal, detecting and converting the combined optical signal into an electrical signal, amplifying the electrical signal, converting the amplified electrical signal into a digital signal, processing the digital signal and extracting channel specific information included in the PT signals, computing channel power based on the channel specific information, and maintaining a management table.
    Type: Grant
    Filed: December 18, 2020
    Date of Patent: March 8, 2022
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventor: Zhiping Jiang
  • Patent number: 11256154
    Abstract: An optical modulator includes a plurality of Mach-Zehnder optical modulation units. Each of the plurality of Mach-Zehnder optical modulation units include a pair of first signal wirings, a pair of first ground wirings, a pair of first signal electrode pads, and a pair of first ground electrode pads. The pair of first ground electrode pads is displaced by less than the first interval from the pair of first signal electrode pads so as to separate from a center line of each of the plurality of Mach-Zehnder optical modulation units.
    Type: Grant
    Filed: April 1, 2019
    Date of Patent: February 22, 2022
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kenichi Abe, Shusaku Hayashi
  • Patent number: 11257202
    Abstract: A device may use a camera to capture an image of an end face of an optical fiber in a field of view of the camera. The device may monitor a focus metric associated with the image while the image is manually focused using an opto-mechanical assembly. The device may automatically initiate a test to inspect the image of the end face of the optical fiber for compliance with a set of criteria related to cleanliness and damage based on the focus metric satisfying a condition. The device may output a result from the test indicating whether the end face of the optical fiber satisfies the set of criteria related to cleanliness and damage.
    Type: Grant
    Filed: November 2, 2020
    Date of Patent: February 22, 2022
    Assignee: VIAVI Solutions Inc.
    Inventor: Jonathan Eck
  • Patent number: 11218655
    Abstract: A compressive/transform imager comprising a lens array positioned above input ports for collecting light into the input ports, waveguides routing the light from the input port to waveguide mixing regions (e.g. multi-mode interference couplers), and detectors for receiving outputs of the waveguide mixing regions.
    Type: Grant
    Filed: October 29, 2018
    Date of Patent: January 4, 2022
    Assignee: The Charles Stark Draper Laboratory Inc.
    Inventors: Michael Moebius, Julian Brown, Steven Spector, Benjamin Lane, Alan Zhou, Hannah Anne Clevenson, Lucas David Benney
  • Patent number: 11162827
    Abstract: The at least one value is respectively determined from at least one measured value of the sensors (20-29) in a method for determining at least one physical value in a space (10) in which several sensors (20-29) are arranged which are set up to measurer the at least one value, for several positions (30) in the space (10) where there is no sensor (20-29). A system which is set up in order to determine the at least one physical value in the space (10) has several sensors (20-29) which are arranged in the space (10). Furthermore, it has a database, in which information about the space (10) is stored, and a computer which is set up in order to determine the at least one value by means of the method.
    Type: Grant
    Filed: March 31, 2021
    Date of Patent: November 2, 2021
    Assignee: Balluff GmbH
    Inventors: Martin Osterfeld, Stephan Langer, Roland Schafer, Albert Dorneich, Andrea Hiller-Brod, Jorg Maier, Jochen Streib
  • Patent number: 11162782
    Abstract: Example embodiments add an optical amplifier to an multi-channel, continuously swept OFDR measurement system, adjust amplified swept laser output power between rising and falling laser sweeps, and/or utilize portions of a laser sweep in which OFDR measurements are not typically performed to enhance the integrity of the OFDR measurement system, improve the performance and quality of OFDR measurements, and perform additional measurements and tests.
    Type: Grant
    Filed: July 28, 2020
    Date of Patent: November 2, 2021
    Assignee: Intuitive Surgical Operations, Inc.
    Inventors: Kevin M. Marsden, Mark E. Froggatt, Matthew S. Wolfe
  • Patent number: 11143649
    Abstract: Disclosed are methods for the free solution measurement of molecular interactions by refractive index sensing other than backscattering interferometry. The disclosed methods can have very low detection limits and/or very low sample volume requirements. Also disclosed are various biosensor applications of the disclosed techniques. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.
    Type: Grant
    Filed: March 9, 2020
    Date of Patent: October 12, 2021
    Assignee: Vanderbilt University
    Inventors: Darryl J. Bornhop, Amanda Kussrow, Michael Kammer
  • Patent number: 11105657
    Abstract: An optical inspection system includes an optical fiber sensor, an optical filter, a signal processor, and a corrector. The optical fiber sensor outputs a first optical signal having a temporal change in a wavelength corresponding to a temporal change in an amplitude of a vibration propagating in an inspection target object or a temporal change in a displacement of the inspection target object. The optical filter converts the first optical signal into a second optical signal having a temporal change in an intensity. The signal processor acquires inspection information on the inspection target object on the basis of the second optical signal. The corrector corrects a correspondence relationship between the temporal change in the wavelength and the temporal change in the intensity by changing a wavelength characteristic of the optical filter. The correspondence relationship is directed to converting the first optical signal into the second optical signal.
    Type: Grant
    Filed: April 3, 2019
    Date of Patent: August 31, 2021
    Assignee: SUBARU CORPORATION
    Inventors: Hideki Soejima, Toshimichi Ogisu
  • Patent number: 11047742
    Abstract: A method for detecting coherent light that includes configuring a spatial interferometer, receiving the coherent light through the spatial interferometer, and disposing a photo detector adjacent to the spatial interferometer. The spatial interferometer is configured such that a coherent light passing through the spatial interferometer interferes with itself. The interference of the coherent light with itself creates a light fringe. The light fringe projects onto the photo detector. The photo detector has an array of pixels operable to detect an intensity of coherent light. The array of pixels provides a plurality of outputs corresponding to coherent light received by discrete pixels of the array of pixels. The method includes determining an interference pattern of the light fringe based on the plurality of outputs of the array of pixels, and determining one or more wavelengths of the coherent light from the interference pattern.
    Type: Grant
    Filed: November 19, 2019
    Date of Patent: June 29, 2021
    Assignee: The Boeing Company
    Inventor: Thomas G. Chrien
  • Patent number: 11013133
    Abstract: This invention relates to elastomeric coatings for electronics. Disclosed is a electronic device comprising a substrate layer, a conductive layer and an encapsulant layer. The encapsulant layer comprises at least a butyl rubber material. The butyl rubber encapsulant prevents a change in resistivity of the conductive layer following exposure to nitric acid vapour for 12 hours or hydrochloric acid vapour for 10 hours.
    Type: Grant
    Filed: January 10, 2020
    Date of Patent: May 18, 2021
    Assignees: ARLANXEO SINGAPORE PTE. LTD, The University of Windsor
    Inventors: Lorenzo Ferrari, Gregory J. E. Davidson, Tricia Breen Carmichael
  • Patent number: 10989587
    Abstract: A distributed fibre sensing system and a vibration detection and positioning method therefor are disclosed. The system comprises: a signal generating module, a light source module, an optical frequency comb generating module, a frequency sweeping and pulse generating module, an optical circulator, a sensing fibre, an interference module, a photoelectric conversion module and a detection and position module. The method comprises: obtaining a plurality of Rayleigh backscattering signals of the sensing fibre; performing a fading elimination processing on the Rayleigh backscattering signals, thereby obtaining a plurality of averaged Rayleigh backscattering signals of non-interference fading and polarization fading; performing a phase processing on the averaged Rayleigh backscattering signals, thereby obtaining phase variance curves; and determining a vibration point according to variances in the phase variance curves, and finally obtaining a position and a vibration waveform of the vibration point.
    Type: Grant
    Filed: August 26, 2016
    Date of Patent: April 27, 2021
    Assignees: SHANGHAI JIAOTONG UNIVERSITY, NEUBREX CO., LTD.
    Inventors: Zuyuan He, Qingwen Liu, Dian Chen, Xinyu Fan
  • Patent number: 10972180
    Abstract: An improved technique for acoustic sensing involves, in one embodiment, launching into a medium, a plurality of groups of pulse-modulated electromagnetic-waves. The frequency of electromagnetic waves in a pulse within a group differs from the frequency of the electromagnetic waves in another pulse within the group. The energy scattered by the medium is detected and, in one embodiment, the beat signal may be used to determine a characteristic of the environment of the medium. For example, if the medium is a buried optical fiber into which light pulses have been launched in accordance with the invention, the presence of acoustic waves within the region of the buried fiber can be detected.
    Type: Grant
    Filed: March 12, 2020
    Date of Patent: April 6, 2021
    Assignee: AT&T Intellectual Property II, L.P.
    Inventors: Andrew B. Lewis, Stuart Russell
  • Patent number: 10972181
    Abstract: An improved technique for acoustic sensing involves, in one embodiment, launching into a medium, a plurality of groups of pulse-modulated electromagnetic-waves. The frequency of electromagnetic waves in a pulse within a group differs from the frequency of the electromagnetic waves in another pulse within the group. The energy scattered by the medium is detected and, in one embodiment, may be used to determine a characteristic of the environment of the medium. For example, if the medium is a buried optical fiber into which light pulses have been launched in accordance with the invention, the presence of acoustic waves within the region of the buried fiber can be detected.
    Type: Grant
    Filed: March 12, 2020
    Date of Patent: April 6, 2021
    Assignee: AT&T Intellectual Property II, L.P.
    Inventors: Justin Hayward, Andrew B. Lewis, Stuart Russell
  • Patent number: 10942312
    Abstract: A photonic integrated circuit (PIC) with embedded optical temperature sensing includes an optical interferometer containing a first arm and a second arm, and one or more optical waveguide sections configured to measure an internal temperature of the PIC. The one or more optical waveguide sections are implemented as one or more sections of the first arm and the second arm. The first arm and the second arm have a first optical path length (OPL) and a second OPL and are made of a first material and a second material, respectively.
    Type: Grant
    Filed: March 27, 2019
    Date of Patent: March 9, 2021
    Assignee: Lockheed Martin Corporation
    Inventor: Bruce Gregory Tiemann
  • Patent number: 10901192
    Abstract: A lightweight miniature interferometric device for interferometric inspection of circular multi-channel fiber optic connectors that includes the interferometric microscope, holding fixture, multi-axis motion mechanism and computing device. The system performs an interferometric inspection of multi-channel fiber optic connector. The method of interferometric inspection provides automatic scan of the multi-channel fiber optic connector, reconstructing 3D surfaces of fiber optic termini of the connector and analyzing its parameters. The system connects to the connector by holding fixture and performs an interferometric inspection of each fiber optic terminus of the connector by means of multi-axis motion mechanism.
    Type: Grant
    Filed: December 26, 2018
    Date of Patent: January 26, 2021
    Assignee: SUMIX CORPORATION
    Inventors: Farhad Towfiq, Andrii Fesenko, Oleksander Makeiev
  • Patent number: 10895692
    Abstract: One or more fiber optic rotary joints (FORJ), free space beam combiners, OCT, SEE and/or fluorescence devices and systems for use therewith, methods of manufacturing same and storage mediums are provided. One or more embodiments of FORJs may be used with numerous applications in the optical field, including, but not limited to, OCT and fluorescence applications. Examples of such applications include imaging, evaluating and diagnosing biological objects, such as, but not limited to, for Gastro-intestinal, cardio and/or ophthalmic applications, and being obtained via one or more optical instruments.
    Type: Grant
    Filed: April 27, 2018
    Date of Patent: January 19, 2021
    Assignee: Canon U.S.A., Inc.
    Inventor: Daisuke Yamada
  • Patent number: 10881288
    Abstract: An ophthalmic apparatus that includes a light source of wavelength sweeping type; a measurement optical system; a reference optical system; a light receiving element that receives interference light; a sample clock signal generator that generates a sample clock signal from the light from the light source, the sample clock signal cyclically changing at equal frequency intervals; a signal processor that samples an interference signal based on the sample clock signal, the interference signal being outputted from the light receiving element when the light receiving element receives the interference light. The ophthalmic apparatus generates period data based on the sample clock signal, the period data indicating a relationship between a period of the sample clock signal and time; and determines a processing duration of the interference signal sampled at the signal processor based on the period data.
    Type: Grant
    Filed: December 20, 2019
    Date of Patent: January 5, 2021
    Assignee: TOMEY CORPORATION
    Inventors: Yuji Nozawa, Takashi Sugaya, Chihiro Kato
  • Patent number: 10856780
    Abstract: The invention provides an Optical Coherence Tomography (OCT) system capable of acquiring two orthogonally polarized depth scans from a target such as the fingerprint region of a finger. In the preferred embodiment the birefringence of tissue components and, optionally, other aspects of the target are measured in order determine a characteristic of the target, such as whether it is real of fake finger.
    Type: Grant
    Filed: November 9, 2018
    Date of Patent: December 8, 2020
    Inventor: Joshua Noel Hogan
  • Patent number: 10825163
    Abstract: A device may use a camera to capture an image of an end face of an optical fiber in a field of view of the camera. The device may monitor a focus metric associated with the image while the image is manually focused using an opto-mechanical assembly. The device may automatically initiate a test to inspect the image of the end face of the optical fiber for compliance with a set of criteria related to cleanliness and damage based on the focus metric satisfying a condition. The device may output a result from the test indicating whether the end face of the optical fiber satisfies the set of criteria related to cleanliness and damage.
    Type: Grant
    Filed: June 13, 2019
    Date of Patent: November 3, 2020
    Assignee: VIAVI Solutions Inc.
    Inventor: Jonathan Eck
  • Patent number: 10809413
    Abstract: A sensor assembly for passive detections of downhole well features. Embodiments include a casing collar locator assembly that utilizes fiber optics in combination with a magneto-responsive sensor to detect casing collars and provide real-time location information in a well. The sensor may be configured to work with a poled monolithic structure that is dimensionally responsive to voltage in a way that substantially eliminates noise during detections. Additionally, the sensor may be intentionally imbalanced, utilizing multiple fibers of different lengths and multiple wavelength monitoring so as to provide enhanced directional information as well as allow operators to decipher and address circumstances of polarization fade.
    Type: Grant
    Filed: August 29, 2014
    Date of Patent: October 20, 2020
    Assignee: Schlumberger Technology Corporation
    Inventors: Dominic Brady, Arthur H. Hartog
  • Patent number: 10782121
    Abstract: Example embodiments add an optical amplifier to an multi-channel, continuously swept OFDR measurement system, adjust amplified swept laser output power between rising and falling laser sweeps, and/or utilize portions of a laser sweep in which OFDR measurements are not typically performed to enhance the integrity of the OFDR measurement system, improve the performance and quality of OFDR measurements, and perform additional measurements and tests.
    Type: Grant
    Filed: June 20, 2017
    Date of Patent: September 22, 2020
    Assignee: Intuitive Surgical Operations, Inc.
    Inventors: Kevin M. Marsden, Mark E. Froggatt, Matthew S. Wolfe
  • Patent number: 10761176
    Abstract: A differential signature detection system is provided. The system comprises: a target sensor, wherein the target sensor is configured to measure acoustical signals within a first narrow band around a target frequency; an offset sensor, wherein the offset sensor is configured to measure acoustical signals within a second narrow band around an offset frequency; and a controller coupled to the target sensor and the offset sensor, wherein the controller is configured to: compare a signal output of the target sensor with an output of the signal output of the offset sensor to calculate a differential measurement that comprises a difference in signal peak intensity; compare the differential measurement to a reference signal, wherein the reference signal comprises a threshold indicative of a presence of a characteristic signature peak associated with a target object; and produce an output based on the comparison between the differential measurement and the reference signal.
    Type: Grant
    Filed: October 16, 2018
    Date of Patent: September 1, 2020
    Assignee: Honeywell International Inc.
    Inventor: Steven Tin
  • Patent number: 10753724
    Abstract: A low coherence interferometry imaging system comprising a common-path interferometer that is at least partially integrated as part of a planar lightwave circuit is disclosed. Imaging systems in accordance with the present invention are implemented in integrated optics without the inclusion of highly wavelength-sensitive components. As a result, they exhibit less wavelength dependence than PLC-based interferometers of the prior art. Further, the common-path interferometer arrangement of the present invention avoids polarization and wavelength dispersion effects that plague prior-art PLC-based interferometers. Still further, an integrated common-path interferometer is smaller and less complex than other integrated interferometers, which makes it possible to integrate multiple interferometers on a single chip, thereby enabling multi-signal systems, such as plane-wave parallel OCT systems.
    Type: Grant
    Filed: June 16, 2016
    Date of Patent: August 25, 2020
    Assignee: Academisch Medisch Centrum
    Inventors: Antonius van Leeuwen, Frank Coumans, Nicolás Weiss
  • Patent number: 10743092
    Abstract: Optical switches and methods of switching include a first hybrid coupler configured to accept an input and to provide two branches. A phase tuner on a first branch includes a Mach-Zehnder phase shifter configured to shift a signal on the first branch by a selected phase. A loss compensator on a second branch is configured to match a loss incurred on the first branch. A second hybrid coupler is configured to recombine the two branches such that the phase shift generated by the phase tuner determines which output of the second hybrid coupler is used.
    Type: Grant
    Filed: June 22, 2015
    Date of Patent: August 11, 2020
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Nicolas Dupuis, Benjamin G. Lee, Alexander V. Rylyakov, Mehmet Soyuer
  • Patent number: 10712180
    Abstract: A fiber optical sensor and methods for sensing a physical quantity such as rotation using the same. The sensor has an optical fiber supporting propagation of light that is configured as an interferometer. One or more segments of the optical fiber, where the segments may be non-contiguous, are poled in such a manner that a phase shift in light propagating through the fiber is created in response to application of a voltage to an electrode thereby inducing an electric field across a poled segment of the fiber. A phase modulator comprising multiple poled segments is additionally described. Applying phase-shifting effects differentially across poled segments of optical fibers of an array of optical fibers may also allow for steering an optical beam.
    Type: Grant
    Filed: January 11, 2017
    Date of Patent: July 14, 2020
    Assignee: The Charles Stark Draper Laboratory, Inc.
    Inventors: Juha-Pekka J. Laine, Richard E. Stoner, Adam J. Saltzman, Timothy J. McCarthy, Stephen P. Smith
  • Patent number: 10677642
    Abstract: A prefabricated mat-like structure having lengths of fiber mounted thereon or therein in a predetermined deployment pattern that provides a high spatial density of fiber to give increased spatial sensing resolution is described. The prefabricated mat-like structures may be very easily deployed by being placed against and/or wrapped around an object to be monitored, typically being fastened in place by clamps or the like. In addition, easy removal from the object is also obtained, by simply unfastening the mat-like structure, which may then be redeployed elsewhere. The prefabricated mat-like structure having the fiber already mounted thereon or therein therefore provides a very convenient and easily installable and removable solution.
    Type: Grant
    Filed: August 20, 2015
    Date of Patent: June 9, 2020
    Assignee: Silixa Ltd.
    Inventors: Mahmoud Farhadiroushan, Veronique Mahue, Tom Parker, Sergey Shatalin
  • Patent number: 10627577
    Abstract: The disclosure provides for an optical communication device that includes a photodetector, an optical fiber, a first lens, and a second lens. The optical fiber may be configured to relay light. The first lens may include a first surface and a second surface and has an image plane. The first lens may be configured to receive the light output from the optical fiber, where the received light has a first cross-sectional area at the first surface. The second lens may include a third surface positioned at the image plane of the first lens and a fourth surface positioned adjacent to the photodetector. The second lens may be configured to receive the light output from the first lens and to output light having a second cross-sectional area at the fourth surface that is smaller than the first cross-sectional area.
    Type: Grant
    Filed: January 24, 2019
    Date of Patent: April 21, 2020
    Assignee: X DEVELOPMENT LLC
    Inventors: Andrei Kazmierski, Nam-hyong Kim, Devin Brinkley, Baris Ibrahim Erkmen
  • Patent number: 10627613
    Abstract: The invention relates to a system (20) for full-field interference microscopy imaging of a three-dimensional diffusing sample (206).
    Type: Grant
    Filed: April 8, 2016
    Date of Patent: April 21, 2020
    Assignee: LLTECH MANAGEMENT
    Inventors: Albert Claude Boccara, Fabrice Harms
  • Patent number: 10598785
    Abstract: An image capture device includes, in part, N optical transmit antennas forming a first array, N phase modulators each associated with and adapted to control a phase of a different one of the transmit antennas, M optical receive antennas forming a second array, M phase modulators each associated with and adapted to control a phase of a different one of the receive antennas, and a controller adapted to control phases of the first and second plurality of phase modulators to capture an image of an object. The first and second arrays may be one-dimensional arrays positioned substantially orthogonal to one another. Optionally, the first array is a circular array of transmitters, and the second array is a one-dimensional array of receivers positioned in the same plane as that in which the circular array of the transmitters is disposed.
    Type: Grant
    Filed: February 13, 2017
    Date of Patent: March 24, 2020
    Assignee: CALIFORNIA INSTITUTE OF TECHNOLOGY
    Inventors: Parham Porsandeh Khial, Aroutin Khachaturian, Seyed Ali Hajimiri
  • Patent number: 10571321
    Abstract: The invention relates to a device for measuring fluid parameters, comprising a Coriolis flow meter. The meter comprises a flow tube and an actuator forcing the flow tube into vibration and/or rotation. Further, the meter comprises a displacement sensor for sensing a displacement of the flow tube. The displacement sensor is arranged for measuring an optical fiber length change.
    Type: Grant
    Filed: March 24, 2016
    Date of Patent: February 25, 2020
    Assignee: Fugro Technology B.V.
    Inventors: Johannes Maria Singer, Devrez Mehmet Karabacak
  • Patent number: 10564373
    Abstract: A modular assembly for an imaging system can allow precision alignment to occur in isolated manufacturing stages, with the separate components being assembled together in later stages. An exemplary system includes a support structure, multiple imaging modules exchangeably coupled to the support structure and each including lenslets and a photonic integrated circuit (PIC) device arranged to receive light from the lenslets, multiple fiber arrays each connected to corresponding one of the multiple imaging modules, and a camera system connected to the fiber arrays. The lenslets the PIC device can be integrally coupled prior to assembly with the support structure, so that precise alignment of the lenslets with respect to the PIC device is performed in isolation.
    Type: Grant
    Filed: January 19, 2018
    Date of Patent: February 18, 2020
    Assignee: Lockheed Martin Corporation
    Inventors: Chad E. Ogden, Guy Chriqui
  • Patent number: 10541650
    Abstract: Systems and methods for interrogating sensing systems utilising bursts of samples. Bursts of samples correspond to optical pulses returning from optical sensors, where pulses are spaced at a period significantly longer than the pulse width, giving irregular sample spacing. The interrogation system and method processes the irregular busts of samples to recover phase information from received signals.
    Type: Grant
    Filed: February 5, 2016
    Date of Patent: January 21, 2020
    Assignee: Stingray Geophysical Hong Kong Limited
    Inventor: Julian Fells
  • Patent number: 10533905
    Abstract: Microelectromechanical systems (MEMS)-based devices capable of measuring wall shear stress vectors in three-dimensional aerodynamic flow fields are provided. A device can include a sensor that senses wall shear stress vectors in two in-plane axes and an interface circuit including a modulation section and a demodulation section. The device can be capable of making direct, real-time wall shear stress measurements without any need for using secondary measurements and/or models for validation.
    Type: Grant
    Filed: February 27, 2018
    Date of Patent: January 14, 2020
    Assignee: University of Florida Research Foundation, Incorporated
    Inventors: Mark Sheplak, Casey B. Keane
  • Patent number: 10425708
    Abstract: A method for controlling the splitting ratio of an input optical signal to one or more output ports is described. The splitting ratio of a fiber-coupled signal in the communications band is controlled using cross phase modulation from a pump signal in the 980-1090 nm band. This design allows the nonlinear fiber in which the cross phase modulation occurs to be standard single mode fiber having a zero dispersion wavelength between 1250 and 1350 nm, such as SMF-28e fiber, which helps to maintain the lowest possible loss and a low cost while still allowing for power efficient interactions with signal wavelengths in the technologically important 1520-1610 nm band. The design is compatible with low insertion loss, narrow switching windows, and low added noise. The location of the pump pulse can be controlled allowing for the location of an input pulse to be determined.
    Type: Grant
    Filed: April 16, 2018
    Date of Patent: September 24, 2019
    Assignee: Nucript LLC
    Inventor: Gregory S. Kanter
  • Patent number: 10420462
    Abstract: An image processing apparatus includes a memory that stores instructions, and at least one processor that executes the instructions to acquire measurement signals including information on a tomography of a subject in a depth direction obtained by performing optical coherence tomography on the subject, to acquire a base signal based on the measurement signals, and to calculate phase shifts between the measurement signals and the base signal. The processor further executes the instructions to smooth the phase shifts, to adjust phases of the measurement signals corresponding to the smoothed phase shifts based on the smoothed phase shifts, and to generate a background signal corresponding to a noise component based on the phase-adjusted measurement signals. In addition, the processor subtracts the background signal from the phase-adjusted measurement signals, and generates a tomographic image of the subject based on the phase-adjusted measurement signals from which the background signal is subtracted.
    Type: Grant
    Filed: November 27, 2017
    Date of Patent: September 24, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventor: Atsushi Goto
  • Patent number: 10422631
    Abstract: An optical fiber includes primary optical core(s) having a first set of properties and secondary optical core(s) having a second set of properties. The primary set of properties includes a first temperature response, and the secondary set of properties includes a second temperature response sufficiently different from the first temperature response to allow a sensing apparatus when coupled to the optical fiber to distinguish between temperature and strain on the optical fiber. A method and apparatus interrogate an optical fiber having one or more primary optical cores with a first temperature response and one or more secondary optical cores with a second temperature response. Interferometric measurement data associated with each primary and secondary optical core are detected when the optical fiber is placed into a sensing position.
    Type: Grant
    Filed: November 11, 2015
    Date of Patent: September 24, 2019
    Assignee: Luna Innovations Incorporated
    Inventors: Matthew T. Reaves, Brian M. Rife, Evan M. Lally, Stephen T. Kreger
  • Patent number: 10409135
    Abstract: The present invention involves a method of controlling at least one first element (22) for heating a multi-resonant optical device (10), automatically alternating between at least a first mode and a second mode, wherein, in the first mode, the first heating element is controlled by a first feedback loop (20) to lead the optical device to operate at a first resonance peak and wherein, at least during part of the second mode, the first feedback loop is made diverging to lead the optical device to operate at a second resonance peak.
    Type: Grant
    Filed: November 6, 2015
    Date of Patent: September 10, 2019
    Assignee: COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
    Inventors: Mounir Zid, Yvain Thonnart
  • Patent number: 10408725
    Abstract: Methods and apparatuses are provided that greatly expand the utility of conventional hollow waveguide-based sensors via either straight, substrate-integrated channels or via meandering (e.g., circuitous, curved or folded optical paths) waveguide sensor designs. Full- or hybrid-integration of the meandering hollow waveguide with light source, detector, and light-guiding optics facilitates compact yet high-performance gas/vapor and/or liquid sensors of the substrate-integrated hollow waveguide sensor.
    Type: Grant
    Filed: September 29, 2012
    Date of Patent: September 10, 2019
    Assignee: Lawrence Livermore National Security, LLC
    Inventors: Jerry Chance Carter, Michael P. Chrisp, Anastacia M. Manuel, Boris Mizaikoff, Andreas Wilk, Seong-Soo Kim
  • Patent number: 10386623
    Abstract: Disclosed herein are adapters configured to be optically coupled to a plurality of microscopes, said adapter comprising: a) a first microscope interface configured to optically couple a first microscope to an optical element in optical communication with an optical probe; b) a second microscope interface configured to optically couple a second microscope to the optical element in optical communication with the optical probe; and c) an optical arrangement configured to direct light collected from a sample with aid of the optical probe to (1) the first microscope and second microscope simultaneously, or (2) the first microscope or second microscope selectively.
    Type: Grant
    Filed: September 7, 2017
    Date of Patent: August 20, 2019
    Assignee: INSCOPIX, INC.
    Inventors: Koen Visscher, Shung Chieh, Arash Tajik
  • Patent number: 10378971
    Abstract: The present invention is related to a method for determining distributed temperature variation of a few mode optical fiber comprising the steps of:—providing a few mode optical fiber;—enlighting a first end of said few mode optical fiber by means of a coherent light source;—determining the interference pattern of coherent light at a second end of the optical fiber;—selecting one maximum of intensity at the second end of the optical fiber by spatially filtering the enlighting at the first end of the optical fiber;—determining the path length of the trajectory of the selected maximum of intensity;—based upon the determined path length of the trajectory of the selected maximum of intensity, determining the temperature variation of the few mode optical fiber.
    Type: Grant
    Filed: July 16, 2015
    Date of Patent: August 13, 2019
    Assignees: Université de Mons, Emphase SPRL
    Inventors: Frédéric Musin, Marc Wuilpart, Patrice Megret
  • Patent number: 10359302
    Abstract: Using hDVS techniques to detect a disturbance in a coherent Rayleigh backscatter caused by the presence of another optical signal in the fiber. The interaction can be caused by a pump pulse travelling shortly after a probe pulse and at a frequency close to that of the probe plus or minus a Brillouin frequency shift. This results in gain or attenuation of the backscatter signal. The Brillouin shift is a function of temperature and strain.
    Type: Grant
    Filed: December 15, 2016
    Date of Patent: July 23, 2019
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Arthur H. Hartog, Florian Englich
  • Patent number: 10352685
    Abstract: A device. The device includes a substrate a substrate, a first optical waveguide disposed on the substrate and a second optical waveguide disposed on the substrate. The device further includes a coupling element disposed on the substrate, the coupling element configured to couple an optical signal in the first optical waveguide to the second optical waveguide, and couple an optical signal in the second optical waveguide to the first optical waveguide. A first reflective element is disposed at an end of the first optical waveguide configured to reflect optical signals in the first optical waveguide. A second reflective element disposed at an end of the second optical waveguide configured to reflect signals in the second optical waveguide.
    Type: Grant
    Filed: December 3, 2015
    Date of Patent: July 16, 2019
    Assignee: Geospace Technologies Corporation
    Inventor: Willard Womack
  • Patent number: 10314491
    Abstract: Optics for apodizing an optical imaging probe beam, and methods for fabricating optics for apodizing an optical imaging probe beam are provided. In some embodiments, optics for apodizing an electrical comprises: an optical fiber; a focusing element coaxially aligned with the optical fiber; an element having a cylindrical bore and an angled reflective surface, wherein a first portion of a beam focused by the focusing element enters the cylindrical bore and a second portion of the beam is reflected at an angle to produce a beam with a generally annular-shaped profile.
    Type: Grant
    Filed: February 12, 2018
    Date of Patent: June 11, 2019
    Assignee: The General Hospital Corporation
    Inventors: Dongyao Cui, Kengyeh K. Chu, Guillermo J. Tearney
  • Patent number: 10305597
    Abstract: Methods and systems for encoding multi-level pulse amplitude modulated signals using integrated optoelectronics are disclosed and may include generating a multi-level, amplitude-modulated optical signal utilizing an optical modulator driven by first and second electrical input signals, where the optical modulator may configure levels in the multi-level amplitude modulated optical signal, drivers are coupled to the optical modulator; and the first and second electrical input signals may be synchronized before being communicated to the drivers. The optical modulator may include optical modulator elements coupled in series and configured into groups. The number of optical modular elements and groups may configure the number of levels in the multi-level amplitude modulated optical signal. Unit drivers may be coupled to each of the groups. The electrical input signals may be synchronized before communicating them to the unit drivers utilizing flip-flops.
    Type: Grant
    Filed: January 17, 2017
    Date of Patent: May 28, 2019
    Assignee: Luxtera, Inc.
    Inventors: Daniel Kucharski, Brian Welch, Sherif Abdalla
  • Patent number: 10302411
    Abstract: In order to measure the contrast of interference in an interference-based, closed-loop, phase-modulating optical sensor device, the gain of the feedback loop in a feedback controller is evaluated. This gain is found to be a measure for the contrast. The contrast evaluated in this way can e.g. be used for period-disambiguation when determining the measurand of the sensor device. The sensor device can e.g. be a high-voltage sensor or a current sensor.
    Type: Grant
    Filed: September 5, 2017
    Date of Patent: May 28, 2019
    Assignee: ABB Schweiz AG
    Inventors: Xun Gu, Sergio Vincenzo Marchese, Klaus Bohnert