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| Number | Title | Issue Date |
| 8098380 | Resonator fiber optic gyroscope (RFOG) with reduced bias error from high order spatial modes Multiple resonator fiber optic gyroscope (RFOG) configurations comprising one or more mode filters inside the resonator are adopted to effectively suppress unwanted high order spatial modes which can be a significant source of gyro bias errors. The resonator compris... | 01/17/2012 |
| 8085407 | Resonator optical gyroscope having input beam modulation optimized for high sensitivity and low bias Systems and methods for optimizing input beam modulation for high gyro sensitivity and low bias errors. The present invention is a resonator optical gyroscope having an optimized phase-modulation amplitude (frequency) for a selected modulation frequency (amplitude) ... | 12/27/2011 |
| 8068233 | Compact resonator fiber optic gyroscopes Substantially symmetric RFOG configurations for rotation rate sensing using two input/output coupling components. Configurations are disclosed where optical coupling components handles both input and output lightwaves. Reducing the number of input/output coupling co... | 11/29/2011 |
| 8068232 | Unidirectional crow gyroscope An optical waveguide gyroscope includes at least one optical coupler configured to receive a first optical signal at a first port, to transmit a second optical signal to a second port, and to transmit a third optical signal to a third port. The optical waveguide gyr... | 11/29/2011 |
| 8031343 | High-index contrast waveguide optical gyroscope having segmented paths A waveguide optical gyroscope is disclosed. The waveguide optical gyroscope includes a laser, two detectors, a set of couplers and a set of waveguides. The laser generates a light beam. A first waveguide guides the light beam to travel in a first direction, and a se... | 10/04/2011 |
| 8009296 | Light-phase-noise error reducer A resonator gyroscope comprises a reference laser generator to produce a reference light; a first slave light source to produce a first slave light locked to the reference light; a second slave light source to produce a second slave light locked to the reference lig... | 08/30/2011 |
| 7933020 | System and method for reducing laser phase noise in a resonator fiber optic gyroscope A resonator gyroscope comprises a reference laser generator to produce a reference light; a first slave light source to produce a first slave light locked to the reference light; a second slave light source to produce a second slave light locked to the reference lig... | 04/26/2011 |
| 7889350 | RFOG with reduced polarization mode induced bias error Hollow core fiber RFOG having symmetric M-(or W-)shape, three-(or two-)mirror configurations. These symmetric configurations help to cancel out polarization error induced bias of the RFOG even when light of the unwanted ESOP is present. The RFOG resonator with optic... | 02/15/2011 |
| 7869052 | Method and amplifying stage for suppressing modulation distortion rate sensing errors in a resonator fiber optic gyroscope A device and a method for suppressing 2nd order harmonic distortion in a Resonator Fiber Optic Gyroscope includes driving a laser to generate at least one of a plurality of counter propagating laser beams traveling through a fiber optic resonator according to a modu... | 01/11/2011 |
| 7864328 | Determination of optimum modulation amplitude to suppress modulation-distortation-induced rotation sensing errors in a fiber optic gyroscope A method, implementable in a resonator fiber optic gyroscope (RFOG) having a first wave generator configured to produce a first resonance-detection modulating signal at a fundamental resonance frequency, includes generating with at least a second wave generator a se... | 01/04/2011 |
| 7855789 | RFOG modulation error correction Systems and methods for performing modulation error correction. An example system applies common phase/frequency modulation to first and second laser beams, a first intensity modulation to the first modulated beam, and a second intensity modulation to the second mod... | 12/21/2010 |
| 7751055 | Hollow core fiber optical gyro Apparatus is provided for a fiber optic gyro. The fiber optic gyro includes a ring resonator having first and second counter-propagating directions. The ring resonator includes a coil having an axis and an optical fiber having a hollow core. The ring resonator is co... | 07/06/2010 |
| 7564563 | Laser gyro and electronic device using the same A laser gyro of the present invention includes laser light excitation means (a semiconductor laser device 100) that excites first and second laser lights propagating in the opposite directions to each other in a circular ring-shaped path (an optical path 4... | 07/21/2009 |
| 7535576 | Integrated optical rotation sensor and method for sensing rotation rate Methods and apparatus are provided for a low cost optical gyro using thin film waveguides to direct light beams among the components of the gyro. The gyro includes a substrate having an insulator layer, a silicon waveguide formed on the insulator layer, and a resona... | 05/19/2009 |
| 7522284 | Optical resonator gyro and method for reducing resonance asymmetry errors Methods and apparatus are provided for attenuating rotation rate errors in a resonator gyro. The gyro includes a ring resonator having a hollow core optical fiber coil and optical elements that are selected and/or oriented to reduce stray light that may be present i... | 04/21/2009 |
| 7486401 | Laser medium pumping system for a gyroscope An apparatus for detecting rotation and a method for constructing the apparatus are provided. The apparatus comprises an optical fiber having a hollow passageway therethrough, a laser medium within the hollow passageway and interconnecting the first and second porti... | 02/03/2009 |
| 7463360 | Optical resonator gyro with integrated external cavity beam generator Methods and apparatus are provided for determining the rotational rate of an optical gyro. An optical gyro comprises at least one substrate, a multi-frequency light source (MFLS) mounted on the substrate, and a resonator coupled to the MFLS. The MFLS is configured t... | 12/09/2008 |
| 7388671 | Polarizing cavity for RFOG and method for sensing rotation rate of resonator Methods and apparatus are provided for attenuating polarization errors in ring resonators of fiber optic gyros. A ring resonator is provided having first and second resonance frequencies and comprising an optical fiber coil having a hollow core and first and second ... | 06/17/2008 |
| 7385177 | Light guide rotation rate detector with coupled optical resonators A method and device are presented for use in determining a rate of rotation of an object. The device comprises a light guide comprising an arrangement of a plurality of coupled optical resonators arranged along a curvilinear optical path. This allows for determining... | 06/10/2008 |
| 7372574 | System and method for stabilizing light sources in resonator gyro Methods and apparatus are provided for stabilizing laser light sources of a resonator gyro. A resonator gyro comprises a first light source configured to produce a first input light, a second light source configured to produce a second input light, a resonator coupl... | 05/13/2008 |
| 7362443 | Optical gyro with free space resonator and method for sensing inertial rotation rate Methods and apparatus are provided for a low cost optical gyro with a free space closed optical path. A ring resonator comprises a substrate and reflectors formed or placed on the substrate. The reflectors comprise a closed optical path and are configured to direct ... | 04/22/2008 |
| 7327460 | Transmission mode RFOG and method for detecting rotation with RFOG Methods and apparatus are provided for sensing a rotation rate of a ring resonator in a transmission mode. A ring resonator for circulating light beams in counter-propagating directions comprises an optical fiber coil having a hollow core and first and second ends. ... | 02/05/2008 |
| 7319513 | Stabilized solid state gyrolaser without blind region The invention concerns solid-state gyrolasers used to measure rotation speeds or relative angular positions. This type of equipment is used, in particular, in aeronautical applications. The purpose of the invention is to complete the optic devices required to... | 01/15/2008 |
| 7277179 | Magneto-optical sensors A system for estimating a parameter selected from the group consisting of a current, a magnetic field, or combinations thereof comprises a resonant frequency tunable magneto-optical loop resonator, wherein the loop resonator comprises a magneto-optical sensing eleme... | 10/02/2007 |
| 7272160 | Single-frequency Brillouin fiber ring laser with extremely narrow linewidth A single-frequency Brillouin fiber ring laser with extremely narrow linewidth comprises a single-frequency narrow-linewidth rapid-tunable pump laser, a temperature-controlled acoustically-damped package for Brillouin fiber ring laser cavity, and an auto-tracking fee... | 09/18/2007 |
| 7262902 | High gain resonant modulator system and method An optical resonant modulator includes an optical ring resonator and an optical loop that is coupled to the optical ring resonator by two couplers. The optical ring resonator can have a hybrid design in which the ring resonator is formed on an electro-optically pass... | 08/28/2007 |
| 7245381 | Ring laser gyroscope that does not require mirrors In an embodiment of a ring laser gyroscope, a hollow bandgap fiber is filled with a gas or material that will generate laser beams within the fiber upon being excited by an energy source. A detector coupled to the fiber detects a standing wave pattern within the fib... | 07/17/2007 |
| 7233711 | Autonomous evanescent optical nanosensor A sensor includes traps that are adjacent to a waveguide and capable of holding a contaminant for an interaction with an evanescent field surrounding the waveguide. When held in a trap, a particle of the contaminant, which may be an atom, a molecule, a virus, or a m... | 06/19/2007 |
| 7230686 | Four-mode stabilized solid-state gyrolaser without blind region The invention concerns solid-state gyrolasers used to measure rotation speeds or relative angular positions. This type of equipment is used, in particular, in aeronautical applications. The purpose of the invention is to complete the optic devices required to... | 06/12/2007 |
| 7228024 | Optical return loss detecting device An optical return loss detecting device is provided for measuring the optical return loss (ORL) of a device under test (DUT). The detecting device comprises a light source, an optical isolator connected to the light source for preventing reflected light by the DUT e... | 06/05/2007 |
| 7215848 | Optical isolator utilizing a micro-resonator An optical isolator for coupling light from a first waveguide to a second waveguide is disclosed. The optical isolator utilizes a resonator coupled to the first and second optical waveguides. The resonator has a resonance at λ for light traveling from the first opt... | 05/08/2007 |
| 7206467 | Methods and apparatus for passive depolarization Apparatuses for depolarizing light are disclosed. A disclosed passive optical depolarizer for depolarizing a polarized light source includes a waveguide and a first microresonator. The waveguide has a first birefringence. The first microresonator has a second birefr... | 04/17/2007 |
| 7197208 | Wavelength tunable light sources and methods of operating the same Wavelength tunable light sources and methods of operating the same are described. In one aspect, a wavelength tunable light source includes a resonant light path, an optical gain medium, an optical grating, a first acousto-optic deflector, and a second acousto-optic... | 03/27/2007 |
| 7184451 | Continuously tunable coupled opto-electronic oscillators having balanced opto-electronic filters Devices and techniques for achieving continuous tuning of coupled opto-electronic oscillators with signal filtering in RF or microwave frequencies by optical filtering via two optical resonators in two separate optical paths. ... | 02/27/2007 |
| 7145660 | Micro-resonator based optical sensor An optical sensor system for providing an output signal in response to a sensed parameter is disclosed. The sensor system comprises an optical signal source generating an input signal, a sensing element in optical communication with the optical signal source and a d... | 12/05/2006 |
| 7142570 | Apparatus and method for generating optical carrier for microwave and millimeterwave photonics system An apparatus and a method for generating an optical carrier is disclosed. The apparatus includes: a light source generating a pump light; a SBS generator for stimulated Brillouin scattering the pump light to generate a stokes light from the light source; an attenuat... | 11/28/2006 |
| 7116687 | High repetition rate passively Q-switched laser for blue laser based on interactions in fiber A laser apparatus is disclosed. The apparatus includes a Neodymium-doped lasing material having first and second surfaces and a passive Q-switch optically coupled to the second surface. The first-surface is substantially transparent to a pump radiation and substanti... | 10/03/2006 |
| 7106448 | Integrated resonant micro-optical gyroscope and method of fabrication An integrated optic gyroscope is disclosed which is based on a photonic integrated circuit (PIC) having a bidirectional laser source, a pair of optical waveguide phase modulators and a pair of waveguide photodetectors. The PIC can be connected to a passive ring reso... | 09/12/2006 |
| 7098972 | Liquid crystal projector with different shaped housing for each liquid crystal panel dependent on color The invention provides a cased electro-optical apparatus that can include an electro-optical unit that receives light in the image display area from a light source, a plate that opposes one side of the electro-optical unit, and a cover for covering the electro-optic... | 08/29/2006 |
| 7039076 | Fiber amplifier system for producing visible light A light source is disclosed having a pulsed laser, a fiber amplifier optically coupled to the pulsed laser, and a nonlinear frequency converting element optically coupled to the fiber amplifier. The pulsed laser, e.g., a passively Q-switched laser, is configured to ... | 05/02/2006 |
