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Class 250/227.17 - Causing polarization change in fiber


Subclass of Class 250 - Radiant energy
Definition: Subject matter in which the condition sensed changes the
No. of patents: 185
Last issue date: 05/20/2008


1          
NumberTitleIssue Date
7376298Optical rotating data transmission device with an unobstructed diameter
A device for transmitting modulated optical signals between a first unit and a second unit, in which the first unit is supported to be rotatable relative to the second unit, comprises a light guide along a circular track on the first unit, a first light coupler for ...
05/20/2008
7372554Selection of a signal input from an optical fiber member
The present invention provides methods and apparatuses for analyzing optical parameters of a selected optical fiber member. A signal input from an optical fiber member is selected by instructing a corresponding optical separation device. The output from the correspo...
05/13/2008
7373056High-voltage component with optical fiber and method for producing it
A high-voltage component, having a first end and a second end, whereby the first end is on a high-voltage potential with respect to the second end. An insulating part, is arranged between the first end and the second end, and an optical fiber is integrated in the hi...
05/13/2008
7358858Road-ice detecting sensor, method for installing same, and road-ice detecting method
A road-ice detecting sensor includes: a temperature sensing member of T shape made of a highly heat conductive metal, having a temperature sensor to be grounded onto a road and a fin part erected from this temperature sensor; an optical fiber having an FBG bonded on...
04/15/2008
7340118Fuel injectors with integral fiber optic pressure sensors and associated compensation and status monitoring devices
Fuel injectors (10) for internal combustion engines are modified and equipped with fiber optic fuel pressure sensors (12) and fiber optic combustion pressure sensors (14). The combustion pressure sensors (14) are located in separate chann...
03/04/2008
7330245Calculation of birefringence in a waveguide based on Rayleigh scatter
Light is coupled into two polarization modes of a waveguide, e.g., an optical fiber. The spectral response of Rayleigh backscatter in the waveguide segment for the two polarization modes is measured, e.g., using OFDR, OTDR, OLCR, etc. The autocorrelation of the spec...
02/12/2008
7268699Highway-rail grade crossing hazard mitigation
A hazard mitigation system to detect an object in a highway-railway grade crossing. A structure is provided that includes a fixed foundation and a surface layer that is cushionably placed above the foundation, such that the structure is located between tracks at the...
09/11/2007
7245805Method and apparatus for producing a multiple optical channel source from a supercontinuum generator for WDM communication
A system and method for producing a multiple optical channel source (MOCS). The method includes producing the SC in a medium using at least one femto-second or pico-second optical input pump pulse; splitting input pump pulse or resultant output SC pulse(s) into a pl...
07/17/2007
7245217Hazard mitigation for railway track intrusions at train station platforms
A hazard mitigation system to detect intrusion by an object into a track zone at a train station platform. A structure is provided that includes a fixed foundation and a surface layer that is cushionably placed above the foundation, such that the structure is locate...
07/17/2007
7241986Fiber ringdown pressure/force sensors
A novel fiber ringdown (FRP) pressure sensor is provided for measuring extremely high pressures under extreme environmental conditions of cold and heat. Pressure measurements are achieved in a time domain by measuring ringdown times of emitted light through the fibe...
07/10/2007
7239400Method and apparatus for detecting the position and the orientation of an interventional device
The invention relates to a method and an apparatus for measuring the position and the orientation of an interventional device within a magnetic resonance imaging apparatus, the magnetic resonance image apparatus providing a static magnetic field B0 and ma...
07/03/2007
7212707Temperature-compensated fiber grating packaging arrangement
A passive temperature-compensated optical grating arrangement includes a housing of low CTE material, with the optical grating stretched across the housing between a first, fixed sidewall and a lever arm, the lever arm also being formed of a low CTE material. An exp...
05/01/2007
7209613Electromagnetic field sensing apparatus
An electromagnetic field sensing apparatus includes an optical modulator, a miniature antenna for sensing the electromagnetic field, a light source, a first optical fiber, an optical detector and a second fiber. The optical modulator can vary the amplitude of a ligh...
04/24/2007
7206469Intrusion detection system for use on single mode optical fiber using a polarimeter
A telecommunications optical fiber is secured against intrusion by detecting manipulation of the optical fiber prior to an intrusion event. This can be used in a non-locating system where the detection end is opposite the transmit end or in a locating system which u...
04/17/2007
7197931Sensors for monitoring structural health conditions
Sensors and systems for monitoring structural health conditions. The present invention provides a device for monitoring structural health conditions including a dielectric substrate, a piezoelectric device for actuating and/or sensing Lamb waves, a molding layer dep...
04/03/2007
7200309Single polarization and polarization maintaining optical fibers and system utilizing same
An optical fiber, comprising: a central core having a maximum dimension (A) greater than a minimum dimension (B) and a substantially elliptical shape, the fiber having at least one air hole positioned each opposite side of the cent...
04/03/2007
7194172Single polarization optical fiber and system and method for producing same
An optical fiber that includes a central core having a maximum dimension (A) greater than a minimum dimension (B), preferably with an aspect ratio greater than 1.5, the fiber having at least one air hole positioned on opposite sides of the central core and extending...
03/20/2007
7171093Method for preparing an optical fibre, optical fibre and use of such
Methods for coating an optical fiber with optical fiber Bragg grating (FBG) with a hermetic coating, particularly a coating of carbon, are employed to avoid ingress of gases, vapors or fluids in the ambient environment. This ingress can be from water or hydrogen, wh...
01/30/2007
7170606Multi-way LED-based surface reflectance sensor and spectrophotometer
A light sensor circuit based on direct connection of LEDs to I/O pins of a microcontroller. The LEDs are reverse biased and the parasitic junction capacitance is charged in an output mode. Then, the I/O pins placed into an high-impedance input mode. The time for the...
01/30/2007
7171091Tuned cladding fiber amplifier and laser
Single transverse mode fiber amplifier and laser operation is obtained with a multi-mode signal core surrounded by cladding containing irregular microstructuring that causes loss in all of the core modes except the fundamental while maintaining robust guiding of the...
01/30/2007
7164469Method of evaluating fiber PMD using composite POTDR trace
A method for screening fiber polarization mode dispersion using a polarization optical time domain reflectometer. A pulse radiation is emitted into the fiber under test, and the backscattered radiation is measured by the POTDR and used to obtain a POTDR trace. A com...
01/16/2007
7158275Polarization modulator
Systems and techniques for changing a polarization profile of light to a desired polarization profile. In some implementations, a polarization modulator is in communication with a stress modulator. The polarization modulator alters the polarization profile of light ...
01/02/2007
7154082Frequency division and/or wavelength division multiplexed recursive fiber optic telemetry scheme for an optical sensor array
An optical fiber sensor array is disclosed which includes a first sensor fiber and a first reference fiber coupled at one end thereof to one side of a first optical coupling. A first wavelength selective reflector is coupled to the other end of each of the first sen...
12/26/2006
7155074Pressure transducer featuring large diameter optical waveguide having bragg grating and being configured for reducing the bulk modulus of compressibility thereof
A pressure transducer has a cane waveguide geometry with “side-holes” in the cane waveguide cross-section that reduce the force required to compress the waveguide. The cane waveguide is a large diameter optical waveguide with a cross-section of at least about 0....
12/26/2006
7145646On-line tension measurement in an optical fiber
A process of contactless monitoring the tension in an optical fiber and a tension meter which enables contactliess measurement of the tension in a bare and in a coated optical fiber. By measuring the retardation induced by the birefringence of an optical fiber by me...
12/05/2006
7142737Intrusion detection system for use on single mode optical fiber using a storage register for data
A telecommunications optical fiber is secured against intrusion by detecting manipulation of the optical fiber prior to an intrusion event. This can be used in a non-locating system where the detection end is opposite the transmit end or in a locating system which u...
11/28/2006
7084826Low cost inductor devices manufactured from conductive loaded resin-based materials
Inductors and inductive devices are formed of a conductive loaded resin-based material. The conductive loaded resin-based material comprises micron conductive powder(s), conductive fiber(s), or a combination of conductive powder and conductive fibers in a base resin...
08/01/2006
7076122Patch-type extrinsic Fabry-Perot interferometric fiber optic sensor and real-time structural vibration monitoring method using the same
A patch-type extrinsic Fabry-Perot interferometric fiber optic sensor and a real-time structural vibration monitoring method using the same are disclosed. The patch-type extrinsic Fabry-Perot interferometric fiber optic sensor is provided by combining the existing E...
07/11/2006
7062126Tunable optical filter having large diameter optical waveguide with bragg grating and being configured for reducing the bulk modulus of compressibility thereof
A tunable optical filter has a large diameter cane waveguide with “side-holes” in the cane cross-section that reduce the force required to compress the large diameter optical waveguide without overly compromising the buckling strength thereof. The large diameter...
06/13/2006
7050169Method of measuring a physical function using a composite function which includes the physical function and an arbitrary reference function
A method for measuring a physical function forms a symmetric composite function by combining the physical function with a reference function. The method obtains a Fourier transform of the symmetric composite function. The method calculates an inverse Fourier transfo...
05/23/2006
7035548Polarization-mode dispersion detecting method, and a dispersion compensation controlling apparatus and a dispersion compensation controlling method
A dispersion compensation controlling apparatus used in a very high-speed optical communication system adopting optical time division multiplexing system comprises a first specific frequency component detecting unit (2a) detecting a first specific freq...
04/25/2006
7030366Micro piezo-optic composite transducers and fabrication methods
A micro piezo-optic composite transducer comprises: dielectric material; electrodes situated over opposing surfaces of the dielectric material; an optical fiber embedded in the dielectric material, the optical fiber configured to have a wavelength response as a func...
04/18/2006
7025499Device for testing a material that changes shape when an electric and/or magnetic field is applied
A device for testing a material that changes shape when an electric and/or magnetic field is applied, in particular a piezoactive material, having a generator to generate an electric field and/or a magnetic field is described. This permits a rapid characterization o...
04/11/2006
7008795Multi-way LED-based chemochromic sensor
A chemochromic sensor includes multiple bi-directional LEDs, each optically aligned with one or more test areas. Each LED is used as both a light emitter when driven in forward bias, and as a light detector when driven in reverse bias. By alternating the bias on the...
03/07/2006
6996316Large diameter D-shaped optical waveguide and coupler
A large diameter D-shaped optical waveguide device 9, includes an optional circular waveguide portion 11 and a D-shaped waveguide portion 10 having at least one core 12 surrounded by a cladding 14. A portion of the waveguide device...
02/07/2006
6973223Device for providing polarized light
In a device (100) for continuously varying the extinction ratio, ER, a laser diode (102) is connected to a first end of a PZ fiber (108). At a second end, the PZ fiber is connected to a connector (110). At the other end of the connector a...
12/06/2005
6957574Well integrity monitoring system
Improved methods and apparatuses for directly monitoring well casing strain and structural integrity are disclosed that allows for monitoring of potentially damaging strain from any orientation or mode and over long stretches of well casing. In a preferred embodimen...
10/25/2005
6946645Measuring system with sweeping comb filter and multiplexer
High-resolution measurement of a parameter is provided at multiple different locations simultaneously along an optic fiber. Light within a predefined range of wavelengths is transmitted into an optic fiber that contains multiple birefringent fiber optic pressure tra...
09/20/2005
6946646Method of evaluating fiber PMD using polarization optical time domain reflectometry
A method for screening fiber polarization mode dispersion using a polarization optical time domain reflectometer. A pulse radiation is emitted into the fiber under test, and the backscattered radiation is measured by the POTDR and used to obtain a POTDR trace. The P...
09/20/2005
6931188Side-hole cane waveguide sensor
A side-hole optical cane for measuring pressure and/or temperature is disclosed. The side-hole cane has a light guiding core containing a sensor and a cladding containing symmetrical side-holes extending substantially parallel to the core. The side-holes cause an as...
08/16/2005
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