With Coherent Interferrometric Light Patents (Class 250/227.19)
  • Patent number: 10338309
    Abstract: Methods and systems for stabilized directional couplers are disclosed and may include a system comprising first and second directional couplers formed by first and second waveguides, where one of the waveguides may comprise a length extender between the directional couplers. The directional couplers may be formed by reduced spacing between the waveguides on opposite sides of the length extender. An input optical signal may be communicated into one of the waveguides, where at least a portion of the input optical signal may be coupled between the waveguides in the first directional coupler and at least a portion of the coupled optical signal may be coupled between the waveguides in the second directional coupler. Optical signals may be communicated out of the system with magnitudes at a desired percentage of the input optical signal. The length extender may add phase delay for signals in one of the first and second waveguides.
    Type: Grant
    Filed: December 13, 2013
    Date of Patent: July 2, 2019
    Assignee: Luxtera, Inc.
    Inventors: Lieven Verslegers, Steffen Gloeckner, Adithyaram Narasimha, Attila Mekis
  • Patent number: 10254426
    Abstract: An electromagnetic sensitive fiber optic sensor, including a cylinder portion with a hole through the center, where a surface of the cylinder portion includes a magnetostrictive material, and a fiber cable threaded through the cylinder portion and wrapped around the cylinder portion multiple times. In another embodiment, a mandrel surrounds a magnetorestrictive or piezoelectric material and the fiber cable is wrapped around the mandrel.
    Type: Grant
    Filed: January 13, 2015
    Date of Patent: April 9, 2019
    Assignee: Deep Imaging Technologies, Inc.
    Inventors: Robert Michael Payton, Trevor Keith Charles Pugh
  • Patent number: 10199151
    Abstract: A transformer system includes a transformer and a transformer tank. The transformer tank houses the transformer in a bath of a dielectric fluid. The transformer system also includes a controller, and a fiber optic sensor communicatively coupled to the controller. The fiber optic sensor is disposed in the dielectric fluid and operative to provide an output that varies with the level of the dielectric fluid. The controller is operative to determine the level of the dielectric fluid based on the output of the fiber optic sensor.
    Type: Grant
    Filed: April 28, 2017
    Date of Patent: February 5, 2019
    Assignee: ABB Schweiz AG
    Inventor: Luiz V. Cheim
  • Patent number: 10168140
    Abstract: A light detecting module that detects interference light that has exited an exit end surface of an optical fiber in an OCT instrument includes: a ball lens including an incident surface entered by the interference light that has exited the exit end surface, and an exit surface exited by the interference light that has entered the incident surface; and a photodiode including a detecting surface entered by the interference light that has exited the exit surface. The interference light obliquely enters the incident surface with respect to a perpendicular line at an incident position of the interference light. The interference light obliquely exits the exit surface with respect to a perpendicular line at an exit position of the interference light. The interference light obliquely enters the detecting surface with respect to a perpendicular line at an incident position of the interference light.
    Type: Grant
    Filed: October 8, 2015
    Date of Patent: January 1, 2019
    Assignee: HAMAMATSU PHOTONICS K.K.
    Inventors: Kenji Makino, Masato Inagaki, Kei Tabata
  • Patent number: 10145727
    Abstract: A method for diminishing the signal interference of a transmission path of an optical fiber interference system, belonging to the technical field of optical fiber sensing. A wavelength division multiplexer (19) is connected in series to the end of an induced optical fiber, a wavelength component (?2) is separated from an operating path by means of the wavelength division multiplexer (19) so as to measure a signal picked up by a transmission path, and the signal is removed from overall interference sensing signals by taking same as a reference, thereby obtaining a target measurement signal. Also provided is a structure for diminishing the signal interference of a transmission path of an optical fiber interference system. The method and the structure are simple; moreover, the device connected to the end of an induced optical fiber is passive, so that power supply is not required, and it is easy to implement.
    Type: Grant
    Filed: October 10, 2014
    Date of Patent: December 4, 2018
    Assignee: FUDAN UNIVERSITY
    Inventors: Bo Jia, Qian Xiao, Yuan Wu
  • Patent number: 10139492
    Abstract: Laser radar systems include a pentaprism configured to scan a measurement beam with respect to a target surface. A focusing optical assembly includes a corner cube that is used to adjust measurement beam focus. Target distance is estimated based on heterodyne frequencies between a return beam and a local oscillator beam. The local oscillator beam is configured to propagate to and from the focusing optical assembly before mixing with the return beam. In some examples, heterodyne frequencies are calibrated with respect to target distance using a Fabry-Perot interferometer having mirrors fixed to a lithium aluminosilicate glass-ceramic tube.
    Type: Grant
    Filed: February 27, 2017
    Date of Patent: November 27, 2018
    Assignee: Nikon Corporation
    Inventors: Mina A. Rezk, Anthony R. Slotwinski, Daniel G. Smith, Eric Peter Goodwin, Alexander Cooper, Thomas M. Hedges
  • Patent number: 10107874
    Abstract: A sensor (1, 2, 3, 4, 5, 6, 7, 8) comprising a first diamond substrate (9) with at least one color center (15), the sensor (1, 2, 3, 4, 5, 6, 7, 8) further comprising a first piezomagnetic (10) or piezoelectric primary element (11), which primary element (10, 11) is arranged to interact with the color center(s) (15) of the first diamond substrate (9).
    Type: Grant
    Filed: April 16, 2014
    Date of Patent: October 23, 2018
    Assignee: Element Six Technologies Limited
    Inventors: Fedor Jelezko, Jianming Cai, Martin Plenio
  • Patent number: 10094768
    Abstract: The present invention relates to an optical fiber connector for mating a first group of one or more optical fibers (102) with one or more corresponding optical fibers in a second group of one or more optical fibers (103). The optical fiber connector includes a shutter (105), which prevents the ingress of debris into the connector, and provides an optical reference surface with which to calibrate optical fibers that are inserted into the connector. The optical fiber connector finds application in the general optical fiber field, and more particularly finds application in the medical field in which it may be used to connect optical fibers in a photonic needle application.
    Type: Grant
    Filed: April 7, 2015
    Date of Patent: October 9, 2018
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Klaas Cornelis Jan Wijbrans, Gerhardus Wilhelmus Lucassen, Bernardus Hendrikus Wilhelmus Hendriks, Christian Reich, Johannes Antonius Van Rooij, Jaap Knoester
  • Patent number: 10088342
    Abstract: An abnormality detection system includes an optical fiber, a backscattered light detector, and a data processor. The backscattered light detector is connected to one end side and the other end side of the optical fiber, and configured to acquire a first intensity distribution of backscattered light by making light incident on the optical fiber from the one end side and to acquire a second intensity distribution of backscattered light by making light incident on the optical fiber from the other end side. The data processor calculates transmission loss at each position in the longitudinal direction of the optical fiber by using the first and second intensity distributions and a normalization function, and determines whether or not there is an abnormality based on the result of the calculation.
    Type: Grant
    Filed: July 21, 2016
    Date of Patent: October 2, 2018
    Assignee: FUJITSU LIMITED
    Inventors: Kazushi Uno, Fumio Takei, Takeo Kasajima
  • Patent number: 10079465
    Abstract: A coherent amplification device includes a phase modulation stage for preconditioning a laser beam, and a coupling stage for transferring energy and spatial phase information between the first laser beam and a second laser beam. The phase modulation stage may include an electro-optically active medium having a time-dependent refractive index manipulatable by an electric field thereby introducing a time-dependent phase shift to the first laser beam when passed therethrough. The coupling stage may include a coupling medium having a time-dependent and intensity-dependent refractive index with a finite lifetime, where an interference pattern of the laser beams is written into the coupling medium through the time-dependent and intensity-dependent refractive index to generate a holographic grating based on the interference pattern, and where the finite lifetime of the coupling medium and the preconditioned phase modulation facilitates a transfer of energy and spatial phase information between the laser beams.
    Type: Grant
    Filed: August 3, 2017
    Date of Patent: September 18, 2018
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Jonathan Eric Slagle, Joy Elizabeth Haley, Shekhar Guha
  • Patent number: 10031246
    Abstract: A method and system comprising: an optoelectronic oscillator comprising a light generator, a modulator, and at least one optical fiber, the optoelectronic oscillator operating to send a modulated carrier signal through the optical fiber into a target area and receive the return signal; a circuit for removal of the carrier frequency operatively connected to the oscillator comprising at least one phase shifter; at least one mixer operatively connected to the at least one phase shifter; at least control circuit operatively connected the at least one mixer and the at least one phase shifter for controlling the phase shifter and operating to cancel signals other than the sideband signals; a signal processor for processing the sideband signals to detect acoustical and/or vibrational signals from the target area. The method comprises sensing vibrational and/or acoustical signals for detection of acoustical and/or vibrational signals in the target area.
    Type: Grant
    Filed: June 18, 2013
    Date of Patent: July 24, 2018
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Weimin Zhou, Olukayode Okusaga, James P Cahill
  • Patent number: 10006753
    Abstract: In part, aspects of the invention relate to methods, apparatus, and systems for intensity and/or pattern line noise reduction in a data collection system such as an optical coherence tomography system that uses an electromagnetic radiation source and interferometric principles. In one embodiment, the noise is intensity noise or line pattern noise and the source is a laser such as a swept laser. One or more attenuators responsive to one or more control signals can be used in conjunction with an analog or digital feedback network in one embodiment.
    Type: Grant
    Filed: December 17, 2014
    Date of Patent: June 26, 2018
    Assignee: LIGHTLAB IMAGING, INC.
    Inventors: Joseph M. Schmitt, Victor Grinberg
  • Patent number: 9991968
    Abstract: An electromagnetic signal is received at first and second Superconducting Quantum Interference Device (SQUID) SQUID arrays. The first and second SQUID arrays output respective voltage signals corresponding to the electromagnetic signal as received at the first and second SQUID arrays. The first and second SQUID arrays are spaced apart such that there is a phase difference between the electromagnetic signal as received at the first and second SQUID arrays. The phase difference results in a voltage amplitude difference. At least one of the voltage signals is applied to at least one reference optical signal input into an electro-optical device to modify the reference optical signal. The modified optical signal output by the electro-optical device includes a change compared to the reference optical signal. The change is indicative of the phase difference in the electromagnetic signal as received at the first and second SQUID arrays.
    Type: Grant
    Filed: May 24, 2017
    Date of Patent: June 5, 2018
    Assignee: The United States of America as represented by Secretary of the Navy
    Inventors: Benjamin J. Taylor, Anna M. Leese de Escobar, Susan Anne Elizabeth Berggren
  • Patent number: 9976880
    Abstract: A sensor fiber for the detection of changes of temperature, bending, and/or torsion includes a multicore optical waveguide with a fiber Bragg grating (FBG) structure. One embodiment contains at least two FBG cores and a surrounding cladding. The sensor fiber is characterized by one or more distinction and orientation means which produce a marker zone to assign and label each individual FBG core.
    Type: Grant
    Filed: July 26, 2013
    Date of Patent: May 22, 2018
    Assignee: S-fiber, GmbH
    Inventors: Lothar Brehm, Jurgen Rosenkranz, Otto Bernauer, Ralitsa Rosenow, Armin Landers, Katrin Roessner, Robert Hanf
  • Patent number: 9945740
    Abstract: Certain implementations of the disclosed technology may include Fabry-Perot Interferometer (FPI)-based sensors systems and methods for measuring a desired stimulus. In accordance with an example implementation of the disclosed technology, a method is provided for receiving, by a Fabry-Perot Interferometer (FPI) sensor, first interrogation light having a first wavelength and second interrogation light having a second wavelength. The FPI sensor is configured to alter the received first interrogation light and the second interrogation light responsive to a measurement stimulus. The method includes detecting, by a first optical detector, a measurement signal responsive to receiving the altered first interrogation light and the altered second interrogation light from the FPI sensor, the measurement signal corresponding to the measurement stimulus. The method includes producing a measurement output signal, the measurement output signal representing an intensity of the measurement signal.
    Type: Grant
    Filed: May 13, 2016
    Date of Patent: April 17, 2018
    Assignee: Kulite Semiconductor Products, Inc.
    Inventor: Martin A. Sanzari
  • Patent number: 9921331
    Abstract: A multi-sensor electromagnetic (EM) system and method for measuring gradients of EM signals. The multi-sensor EM system includes a frame; a transmitter device attached to the frame and configured to generate a primary EM field; a receiver device attached to the frame and configured to record a secondary EM field generated by the earth after being excited by the primary EM field; and a gradient sensor device attached to the frame and configured to record a gradient of the secondary EM field.
    Type: Grant
    Filed: December 11, 2015
    Date of Patent: March 20, 2018
    Assignee: CGG SERVICES SAS
    Inventor: Philip Miles
  • Patent number: 9909951
    Abstract: A system and method for evaluating individual Fiber Bragg Grating (FBG) sensors in a multiplexed acoustic sensor system, the system comprising: a broadband pulsed source; a circulator that passes a laser pulse to a multiplexed series of N FBG sensors and one reference Fresnel reflector, wherein said circulator also receives a return N+1 reflection pulse train from the N FBG sensors and one reference Fresnel reflector; and an optical switch that receives the return N+1 reflection pulse train from the N FBG sensors and one reference Fresnel reflector.
    Type: Grant
    Filed: December 23, 2014
    Date of Patent: March 6, 2018
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Mikko Jaaskelainen, Han-Sun Choi
  • Patent number: 9891180
    Abstract: According to embodiments of the disclosure, a thermal needle probe is provided. The thermal needle probe may include a heater, a cooler, a temperature measuring element, a heat conduction element and a processor. The heater is configured to heat an object. The cooler is configured to cool the object. The temperature measuring element is configured to measure a temperature raising curve of the object and a temperature dropping curve of the object. The heat conduction element is configured to conduct heat between the heater and the object. The processor is configured to determine a thermal property of the object according to at least one of the temperature raising curve and the temperature dropping curve.
    Type: Grant
    Filed: September 2, 2015
    Date of Patent: February 13, 2018
    Assignee: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE
    Inventor: Chien-Chih Yeh
  • Patent number: 9891134
    Abstract: A long-distance fiber optic monitoring system having a sensing unit and an analyzer that is remotely located from the sensing unit is provided. The sensing unit comprises a source of optical energy for injecting optical energy into the fiber optical cable and an optical detector configured to detect an optical return signal from the optical fiber. The detected optical return signal is associated with an acoustic signal impinging on the optical fiber. The analyzer receives a signal from the remote sensing unit via the optical fiber that is representative of the optical return signal, and determines a location of a disturbance based at least on the received signal. The representative signal can be transmitted from the remote sensing unit to the analyzer as an optical signal or via a metallic wired included with the optical fiber.
    Type: Grant
    Filed: December 12, 2014
    Date of Patent: February 13, 2018
    Assignee: AT&T Intellectual Property I, L.P.
    Inventor: John Sinclair Huffman
  • Patent number: 9886618
    Abstract: The present invention is an authentication apparatus comprising: a prism of an approximately quadrangle-frustum shape, the prism of the approximately quadrangle-frustum shape is arranged so that a bottom side, out of two parallel surfaces of the prism of approximately quadrangle-frustum shape, is a placing surface side for a finger; a first imaging means is arranged below a top surface parallel to the bottom surface, the first imaging means that images an image of the finger transmitted through the top surface; a light source that radiates light to at least one side surface of a first set of side surfaces, out of two sets of side surfaces of the approximately quadrangle-frustum shape that face each other; and a second imaging means that images the image of the finger transmitted through a second set of side surfaces, out of the two sets of side surfaces.
    Type: Grant
    Filed: March 22, 2012
    Date of Patent: February 6, 2018
    Assignee: NEC CORPORATION
    Inventor: Teruyuki Higuchi
  • Patent number: 9857216
    Abstract: A minute object characteristics measuring apparatus is provided. The minute object characteristics measuring apparatus includes a holder, a cantilever, a measuring device, and a driver. The holder holds a minute object. The cantilever faces the minute object held by the holder. The measuring device measures a displacement of the cantilever. The driver drives one of the holder holding the minute object and the cantilever in a direction that the minute object held by the holder and the cantilever are brought close to or drawn away from each other.
    Type: Grant
    Filed: December 28, 2015
    Date of Patent: January 2, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Daichi Yamaguchi, Shuusuke Someno
  • Patent number: 9793984
    Abstract: A coherent receiver adapted to operate as an Optical Spectrum Analyzer (OSA) includes an optical front end adapted to receive an optical signal and to mix the optical signal with a local laser; a photodetector block coupled to the optical front end and adapted to receive an output of the optical front end and provide an output corresponding to spectral components of the optical signal; and a controller coupled to the optical front end and the photodetector block, wherein the controller is adapted to operate in an OSA mode to sweep the local laser across a portion of optical spectrum to perform an OSA measurement while not performing data demodulation.
    Type: Grant
    Filed: January 20, 2016
    Date of Patent: October 17, 2017
    Assignee: Ciena Corporation
    Inventors: Andrew Sinclair, Eric Maniloff
  • Patent number: 9787405
    Abstract: Described are various embodiments of a dual optical modulator, system and method. In one embodiment, an optical modulator modulates an input optical signal having a designated optical frequency. The modulator comprises first and second tunable modulators operable around the optical frequency and operatively disposed between a bus waveguide path and an opposed waveguide path. The modulator further comprises a relative optical phase-shifter optically coupled between the tunable modulators so to impart a relative optical phase shift between the bus waveguide path and the opposed waveguide path. The tunable modulators are respectively driveable to modulate a respective resonance thereof in complimentary directions relative to the optical frequency and thereby resonantly redirect a selectable portion of the input optical signal along the opposed waveguide path such that the relative optical phase shift is imparted thereto for output.
    Type: Grant
    Filed: November 19, 2015
    Date of Patent: October 10, 2017
    Assignee: Elenion Advanced Technology, LLC
    Inventors: Thomas Wetteland Baehr-Jones, Michael J. Hochberg, Yang Liu
  • Patent number: 9784569
    Abstract: An accurate measurement method and apparatus using an optical fiber are disclosed. A total change in optical length in an optical core in the optical fiber is determined that reflects an accumulation of all of the changes in optical length for multiple segment lengths of the optical core up to a point on the optical fiber. The total change in optical length in the optical core is provided for calculation of an average strain over a length of the optical core based on the detected total change in optical length.
    Type: Grant
    Filed: July 8, 2014
    Date of Patent: October 10, 2017
    Assignee: Intuitive Surgical Operations, Inc.
    Inventors: Mark E. Froggatt, Justin W. Klein, Dawn K. Gifford, Stephen Tod Kreger
  • Patent number: 9746393
    Abstract: This application relates to methods and apparatus for fiber optic sensing which can provide information about the environment in which the fiber optic is deployed. In particular the application relates to fiber optic based sensing of the mechanical impedance of the environment. The method comprises using an interrogator (201) to interrogate an optical fiber (104) which is coupled to a first element (202; 802) which is responsive to electromagnetic fields. In use a varying electric current (I), which may be an alternating current, is applied so as to induce a varying force (F) on said first element. The optical radiation backscattered from within the optical fiber is analyzed to determine a measurement signal indicative of a variation in the backscattered radiation corresponding with said electric current applied. The first element may be a first conductor (202) and the varying current may be supplied to the first conductor, or to a second conductor (701).
    Type: Grant
    Filed: June 27, 2013
    Date of Patent: August 29, 2017
    Assignee: OPTASENSE HOLDINGS LIMITED
    Inventor: Alastair Godfrey
  • Patent number: 9706915
    Abstract: An image data set acquired by an optical coherence tomography (OCT) system is corrected for effects due to motion of the sample. A first set of A-scans is acquired within a time short enough to avoid any significant motion of the sample. A second more extensive set of A-scans is acquired over an overlapping region on the sample. Significant sample motion may occur during acquisition of the second set. A-scans from the first set are matched with A-scans from the second set, based on similarity between the longitudinal optical scattering profiles they contain. Such matched pairs of A-scans are likely to correspond to the same region in the sample. Comparison of the OCT scanner coordinates that produced each A-scan in a matching pair, in conjunction with any shift in the longitudinal scattering profiles between the pair of A-scans, reveals the displacement of the sample between acquisition of the first and second A-scans in the pair.
    Type: Grant
    Filed: September 22, 2015
    Date of Patent: July 18, 2017
    Assignee: CARL ZEISS MEDITEC, INC.
    Inventors: Matthew J. Everett, Keith E. O'Hara
  • Patent number: 9677957
    Abstract: A serial weak FBG interrogator is disclosed. The serial weak FBG interrogator may include a CW tunable laser or pulsed laser utilized as a laser source and an EDFA. The serial weak FBG interrogator may also be an interrogation of a single sensor system by utilization of a DFB laser which utilizes a single sensor, which may be an interferometer sensor, an extrinsic Fabry-Perot interferometer or a wavelength-modulated sensor. The serial weak FBG interrogator may also include a computer system or CSPU.
    Type: Grant
    Filed: November 27, 2013
    Date of Patent: June 13, 2017
    Assignee: Senek Instrument LLC
    Inventors: Bo Dong, Fabin Shen, Anbo Wang
  • Patent number: 9546915
    Abstract: A method for estimating a parameter includes: generating an optical signal, the optical signal modulated via a modulation signal; transmitting the modulated optical signal from a light source into an optical fiber, the optical fiber including a plurality of sensing locations disposed along the optical fiber and configured to reflect light; receiving a reflected signal including light reflected from the plurality of sensing locations; and combining, in parallel, each of a plurality of reference signals with the reflected signal to estimate a value of the parameter.
    Type: Grant
    Filed: October 12, 2011
    Date of Patent: January 17, 2017
    Assignee: BAKER HUGHES INCORPORATED
    Inventors: Roger Glen Duncan, Alexander M. Barry, Brooks A. Childers, Robert M. Harman, Philip Robin Couch
  • Patent number: 9523568
    Abstract: A wavelength-swept light source apparatus comprises a light source that emits a wavelength-swept light that varies in a predetermined cycle, a mode hop detector that detects a mode hop of the wavelength-swept light emitted from the light source; and a control unit that controls at least one of a parameter that defines a specified period having a predetermined fixed or variable time length provided in the predetermined cycle and a control parameter of the light source, thereby to set an occurrence timing of the mode hop detected by the mode hop detector outside of the specified period.
    Type: Grant
    Filed: March 3, 2015
    Date of Patent: December 20, 2016
    Assignee: TOMEY CORPORATION
    Inventors: Chihiro Kato, Yuji Nozawa
  • Patent number: 9513530
    Abstract: An optical semiconductor element includes a ring modulator, and a light absorbing material provided at a position apart from a path for a modulated light which is guided by the ring modulator, the light absorbing material absorbing a light leaked out of a ring waveguide of the ring modulator, and increasing a temperature of the ring waveguide.
    Type: Grant
    Filed: March 12, 2014
    Date of Patent: December 6, 2016
    Assignee: FUJITSU LIMITED
    Inventor: Tomoyuki Akiyama
  • Patent number: 9513531
    Abstract: An optical semiconductor element includes a ring modulator, and a light absorbing material provided at a position apart from a path for a modulated light which is guided by the ring modulator, the light absorbing material absorbing a light leaked out of a ring waveguide of the ring modulator, and increasing a temperature of the ring waveguide.
    Type: Grant
    Filed: September 1, 2016
    Date of Patent: December 6, 2016
    Assignee: FUJITSU LIMITED
    Inventor: Tomoyuki Akiyama
  • Patent number: 9513111
    Abstract: An optical fiber sensing spring of the present invention includes a longer cylindrical tension coil spring, a shorter cylindrical compression coil spring and a longer cylindrical tension coil spring that are connected in series to form a spring having the same inner and outer diameters. A single-mode optical fiber manufactured with a long section of fiber grating is placed in the manufactured spring. This section of the fiber grating is tensed to two ends of the cylindrical compression coil spring having a predetermined gauge length, and the force applied is released. A pre-tensing method for providing a maximum tolerable compression strain and manufacturing technology for this sensing element are then achieved. Thus, the self-tensed optical fiber sensing spring structure satisfies a standard 0.9 mm outer diameter, is fully spring jacketed by the full spring jacketing and protection layer, and forms a linear stress-strain relationship in an elasticity stretched elastic region.
    Type: Grant
    Filed: January 19, 2016
    Date of Patent: December 6, 2016
    Assignee: Jinn Her Enterprise Co., Ltd.
    Inventors: Yung-Yu Tsai, Chun-Chu Yang
  • Patent number: 9435701
    Abstract: An optical fiber strain sensor system and method are provided that use pixels of a three-dimension (3-D) pixel sensor to sense the respective light beams passing out of the ends of a reference fiber and a measurement fiber and for converting the respective light beams into respective electrical signals. Because 3-D camera pixels have photodiodes that are directly connected by switches to integrators within the same die, the need to use separate TIAs and phase detection circuitry in each receive channel is eliminated, which reduces system complexity and overall cost. In addition, omitting the separate TIAs and phase detection circuitry for each channel eliminates the phase uncertainty that can occur when using those components, and thus improves measurement precision.
    Type: Grant
    Filed: January 29, 2014
    Date of Patent: September 6, 2016
    Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.
    Inventors: Milos Davidovic, Dawid Z. Janse van Vuuren, Robert Swoboda
  • Patent number: 9429812
    Abstract: An optical device includes an optical reflector based on a coupled-loopback optical waveguide. In particular, an input port, an output port and an optical loop in arms of the optical reflector are optically coupled to a directional coupler. The directional coupler evanescently couples an optical signal between the arms. For example, the directional coupler may include: a multimode interference coupler and/or a Mach-Zehnder Interferometer (MZI). Moreover, destructive interference during the evanescent coupling determines the reflection and transmission power coefficients of the optical reflector.
    Type: Grant
    Filed: October 5, 2015
    Date of Patent: August 30, 2016
    Assignee: ORACLE INTERNATIONAL CORPORATION
    Inventors: Guoliang Li, Xuezhe Zheng, Ying L. Luo, Ashok V. Krishnamoorthy
  • Patent number: 9417267
    Abstract: In an integrated optical circuit, light from a light source is polarized and coupled to a first and second strip waveguide. A waveguide coupling element couples the two optical signals from the two strip waveguides to different polarization modes of an optical fiber line. The optical fiber line is connected to a measuring head, which reflects the optical signal and in which a phase difference between the two optical partial signals is modulated in a magnetic field. In the waveguide coupling element, the reflected signal is split into two optical partial signals having the same polarization and the phase difference between the two partial signals is determined. A phase modulator device provides for closed-loop operation. Compared to fiber-optical concepts, the number of splices is reduced.
    Type: Grant
    Filed: February 8, 2013
    Date of Patent: August 16, 2016
    Assignee: Northrop Grumman Litef GmbH
    Inventors: Georg Dorner, Sven Voigt, Christian Koos, Wolfgang Freude, Juerg Leuthold
  • Patent number: 9395242
    Abstract: A broadband fiber optic sensor array is formed along a length of single mode optical fiber, with the individual sensing elements formed by introducing local perturbations (e.g., changes in diameter) along the length of the optical fiber. The sensor array requires only a single light source input and a single (conventional) optical spectrum analyzer output and is capable of providing individual measurements (such as local temperature or pressure) for each sensing element disposed along the length of fiber. The individual transmission spectra of the sensing elements forming the array are smooth and strongly overlap, and a method has been developed for determining the characteristics of the individual elements from the variations in the total (combined) transmission spectrum.
    Type: Grant
    Filed: October 6, 2012
    Date of Patent: July 19, 2016
    Assignee: OFS FITEL, LLC
    Inventors: David J DiGiovanni, Mikhail Sumetsky
  • Patent number: 9310446
    Abstract: A magnetic field direction detector for detecting whether a magnetic flux has a component of field from a first side or a second side of a detection axis; the magnetic field direction detector comprising: a first magneto-resistive sensor; and a perturbation generator; wherein the perturbation generator causes an external magnetic field to be perturbed so as to cause the apparent direction of flux to change by an angle ?1 at the first magneto-resistive sensor.
    Type: Grant
    Filed: October 18, 2012
    Date of Patent: April 12, 2016
    Assignee: ANALOG DEVICES, INC.
    Inventor: Jan Kubik
  • Patent number: 9285391
    Abstract: Embodiments of the present disclosure are directed towards techniques and configurations for MEMS sensing device configured to determine inertial change applied to the device. In one instance, the device may comprise a laser arrangement configured to generate a light beam, and a waveguide configured to split the light beam into two portions. The waveguide may include two arms through which the respective portions of the light beam may respectively pass, and disposed substantially parallel with each other and joined together around their respective ends to recombine the portions into a light beam. One of the arms may be deformable. A deformation of the arm may result in a change of an optical path length of a portion of the light beam traveling through the arm, causing a detectable change in light intensity of the recombined light beam outputted by the waveguide. Other embodiments may be described and/or claimed.
    Type: Grant
    Filed: December 13, 2013
    Date of Patent: March 15, 2016
    Assignee: INTEL CORPORATION
    Inventors: David N. Hutchison, John Heck
  • Patent number: 9255821
    Abstract: A fiber optic sensor comprising a first light source, a second light source, a first optical coupler operatively connected with the first light source, and a second optical coupler operatively connected with the second light source. The first optical coupler directs first and second optical waves along a first optical path into first and second ends of an optical fiber such that the first and second optical waves interfere to form a first combined optical wave. The second optical coupler directs the third and fourth optical waves along a second optical path into the first and second ends of the optical fiber such that the third and fourth optical waves interfere to form a second combined optical wave. The second optical path is longer than the first optical path by a predetermined distance. Detectors receive the first and second combined optical waves and output information with respect thereto.
    Type: Grant
    Filed: November 15, 2013
    Date of Patent: February 9, 2016
    Assignee: AFL Telecommunications LLC
    Inventors: Matsuhiro Miyamoto, Sean Foley, Jeffrey Jamieson
  • Patent number: 9217831
    Abstract: The system includes a first optical device and a second optical device. The second optical device has a second facet. The first optical device has a waveguide on a base. The waveguide terminates at a waveguide facet. The waveguide facet is positioned so as to exchange light signals with the second facet. The first optical device also has one or more actuators that are each configured to move the waveguide facet relative to the second facet.
    Type: Grant
    Filed: December 1, 2010
    Date of Patent: December 22, 2015
    Assignee: Kotura, Inc.
    Inventor: Mehdi Asghari
  • Patent number: 9109969
    Abstract: A twisted, multicore fiber communicates light input to each core to an output. The twisting mitigates relative time delays of the input light traveling through each of the cores in the multicore fiber to the output caused by bending of that multicore fiber. An example application is in an optical network that includes an optical input terminal and an optical sensor connected by a twisted multicore connecting fiber. One example of twisted multicore optical fiber is helically-wrapped, multicore fiber.
    Type: Grant
    Filed: June 12, 2012
    Date of Patent: August 18, 2015
    Assignee: INTUITIVE SURGICAL OPERATIONS, INC.
    Inventors: Stephen T. Kreger, Paul F. Wysocki, Jeff T. Lacroix
  • Patent number: 9106334
    Abstract: There are provided a method and a system for characterizing the CMRR of an ICR under test, which employ highly coherent light from two continuous-wave (CW) single-frequency lasers whose respective optical frequencies mutually differ by an offset defining an “Intermediate Frequency” (fIF) in the rf electrical baseband. The method involves the coherent mixing of light from these two lasers in the ICR under test. A “tone” in the rf electrical baseband at frequency fIF is generated by the beating of light from the two single-frequency lasers as they interfere on the photodetectors of the ICR. The resulting tone at frequency fIF in the output electrical signals of the ICR is then detected and analyzed to characterize the CMRR of the ICR.
    Type: Grant
    Filed: May 9, 2014
    Date of Patent: August 11, 2015
    Assignee: EXFO Inc.
    Inventors: Mathias Westlund, Henrik Sunnerud
  • Patent number: 8928883
    Abstract: In certain embodiments, a system for detecting an agent includes a resonator device configured to receive an agent. The resonator device is also configured to transmit light received from a light source, the transmitted light having an altered peak wavelength due to the presence of the received agent. The system further includes a filter device configured to filter the transmitted light having the altered peak wavelength such that the transmitted light having the altered peak wavelength does not reach one or more detectors of a detector array configured to receive transmitted light not filtered by the filter device. The system further includes a processing system operable to determine that the one or more detectors of the detector array are not generating a signal, the absence of the signal being generated by the one or more detectors of the detector array indicating the presence of the agent.
    Type: Grant
    Filed: November 17, 2010
    Date of Patent: January 6, 2015
    Assignee: Raytheon Company
    Inventors: Frank B. Jaworski, Justin Gordon Adams Wehner, Adam M. Kennedy, Darin S. Williams, Anuradha Murthy Agarwal, Juejun Hu
  • Publication number: 20140246610
    Abstract: An optical sensor (10) comprises an optical cavity defined by a dielectric body and responsive to one or more physical environmental conditions, and a waveguide (70) having a terminal end spaced apart from the optical cavity such that light is optically coupled from the terminal end of the waveguide (70) to the optical cavity. The waveguide (70) is arranged such that, in use, it is maintained at a first temperature that would not damage the optical coupling to the optical cavity when the dielectric body is maintained at a second temperature sufficient to damage the optical coupling to the optical cavity.
    Type: Application
    Filed: March 4, 2014
    Publication date: September 4, 2014
    Inventors: Arnold Peter Roscoe HARPIN, John Paul DRAKE, Stephen Geoffrey TYLER
  • Patent number: 8748806
    Abstract: An apparatus and method for reducing the visibility of speckle in coherent light comprises propagating the coherent light through a multimode optical waveguide 106 to reduce a coherence length of the coherent light by intermodal dispersion. A vibratable membrane mirror 104 is arranged to reflect the coherent light either before or after passing through the multimode optical fiber further to reduce the coherence length by distributing wave packets across different propagating modes and to erase the modal structure by averaging the distribution of energy across the modes leading to a more uniform illumination. The invention may be used for speckle removal in a laser scanning projector.
    Type: Grant
    Filed: January 27, 2010
    Date of Patent: June 10, 2014
    Assignee: Optyka Limited
    Inventors: Omar Sqalli, Nicolas Descharmes
  • Patent number: 8625087
    Abstract: Disclosed herein is a packing container including: a packing container body including a leading-out section which contains an optical probe having a first end section for incoming of a laser beam and a second end section for outgoing of the incoming laser beam, which leads out the first end section of the optical probe thus contained to the exterior and which is sealed, and a window section by which the laser beam going out from the second end section of the contained optical probe is led out to the exterior; and a light-transmitting member which closes the window section and permits the laser beam to pass therethrough.
    Type: Grant
    Filed: October 31, 2011
    Date of Patent: January 7, 2014
    Assignee: Sony Corporation
    Inventor: Yoshiro Takiguchi
  • Patent number: 8610880
    Abstract: A distance measuring apparatus and method that enable high-precision and high-speed measurement by canceling variations of a delay circuit in the apparatus are provided. Pulsed light is branched into first and second reference light, and transmitted measurement light, and the difference in detection time among the first reference light along a first path with no optical variations, the second reference light along a second path with an optical delay, and received measurement light from an object to be measured is measured. The received measurement light and the first reference light are temporally separate, distance is calculated from the difference in detection time between the received measurement light and the first reference light.
    Type: Grant
    Filed: December 18, 2009
    Date of Patent: December 17, 2013
    Assignee: Topcon Corporation
    Inventors: Masahiro Ohishi, Yoshikatsu Tokuda
  • Patent number: 8461822
    Abstract: A fiber optic current or magnetic field sensor uses a sensing fiber in a coil for measuring a current or a magnetic field and has a retarder for converting between linearly polarized light and elliptically polarized light. The retardation of the retarder, its temperature dependence as well as its azimuth angle in respect to the plane of the fiber coil are optimized in dependence of the birefringence in the sensing fiber in order to minimize the influence of temperature variations and manufacturing tolerances on the overall scale factor of the sensor.
    Type: Grant
    Filed: September 24, 2010
    Date of Patent: June 11, 2013
    Assignee: ABB Research Ltd
    Inventors: Robert Wueest, Andreas Frank, Klaus Bohnert
  • Patent number: 8420993
    Abstract: An optical signal generator includes a single-mode laser; a reflecting mirror to define another cavity different from a cavity of the single-mode laser, and reflect a part of output light from the single-mode laser to return the part of the output light to the single-mode laser; an intensity modulator provided between the single-mode laser and the reflecting mirror; and a phase adjuster, provided between the single-mode laser and the reflecting mirror, to adjust a frequency difference between a signal on state and a signal off state generated in accordance with intensity modulation by the intensity modulator.
    Type: Grant
    Filed: June 3, 2011
    Date of Patent: April 16, 2013
    Assignee: Fujitsu Limited
    Inventor: Shigeaki Sekiguchi
  • Patent number: 8394329
    Abstract: An agent sensing system may comprise an emitter optical resonator, a functionalized optical resonator, and a reference optical resonator. The emitter optical resonator may be configured to emit light at one or more system peak wavelengths. The functionalized optical resonator may be optically coupled to the emitter optical resonator and configured to propagate the emitted light in the absence of a particular agent, and filter the emitted light in the presence of the particular agent. The reference optical resonator may be optically coupled to at least one of the emitter optical resonator and the functionalized optical resonator such that an intensity of light propagated by the reference optical resonator is based at least on whether light emitted by the emitter optical resonator is filtered or propagated by the functionalized optical resonator.
    Type: Grant
    Filed: July 15, 2009
    Date of Patent: March 12, 2013
    Assignees: Raytheon Company, Massachusetts Institute of Technology
    Inventors: Frank B. Jaworski, Anuradha M. Agarwal