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President Rutherford B. Hayes ; Said in 1876, after Alexander Graham Bell demonstrated the telephone to him at the White House
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| Number | Title | Issue Date |
| 8040586 | Metamaterials One exemplary metamaterial is formed from a plurality of individual unit cells, at least a portion of which have a different permeability than others. The plurality of individual unit cells are arranged to provide a metamaterial having a gradient index along at leas... | 10/18/2011 |
| 8040585 | Optical device and optical system There is provided an optical device including a plurality of polarizers that are arranged along a propagation direction of incident light, where the plurality of polarizers have transmission axes of substantially the same direction, a phaser that is provided between... | 10/18/2011 |
| 7440642 | Integrated optical modulator and method for manufacturing the same An integrated optical modulator and method for manufacturing thereof are disclosed. The integrated optical modulator comprises a carrier wave band modulator using a double sideband modulation method and an intermediate frequency band modulator using a single sideban... | 10/21/2008 |
| 7418205 | Method and apparatus for controlling a frequency hopping laser An optical spread spectrum communication system includes a tunable laser which sequentially outputs optical signals having different wavelengths. The laser produces a frequency spectrum having a plurality of closely spaced modes relative to optical frequencies. The ... | 08/26/2008 |
| 7391978 | Optical signal transmitter and optical signal transmission system The invention provides an optical signal transmitter low in noise and in distortion and provides an optical signal transmission system using this optical signal transmitter. The optical signal transmitter includes a plurality of frequency modulation means for... | 06/24/2008 |
| 7391550 | Method and apparatus for optical broadband frequency chirp Techniques for producing an optical broadband frequency sweep or chirp, include generating a narrowband frequency chirp and a frequency-shifted replica. The narrowband chirp has an optical carrier frequency, a pulse duration and a pulse bandwidth. A frequency-shifte... | 06/24/2008 |
| 7379652 | Method and apparatus for detecting optical spectral properties using optical probe beams with multiple sidebands Techniques for detecting optical spectral properties of a target are described. The technique includes providing an optical carrier which has an optical frequency bandwidth which is narrow compared to the width of the narrowest spectral feature of the target to be d... | 05/27/2008 |
| 7376358 | Location specific optical monitoring An optical spike is generated at an arbitrarily selected location within an arbitrary optical link. The optical spike is generated by deriving a spike signal having a plurality of components, and launching the spike signal into the a transmitter end of the optical l... | 05/20/2008 |
| 7355657 | Laser illuminated projection displays A projection video display includes a light source including an OPS-laser delivering laser radiation in multiple transverse modes (a multiple-transverse-mode OPS-laser). The display includes a spatial light modulator for spatially modulating the radiation from the m... | 04/08/2008 |
| 7336906 | Optical signal transmission An optical signal transmission apparatus for transmitting a plurality of data signals comprising a plurality of inputs for receiving a respective one of the data signals and delivering the respective data signal with a controlled phase and at a controlled data rate.... | 02/26/2008 |
| 7310181 | Optical deflection device and optical deflection method that control occurrence of alignment defect An optical deflection device includes an optical deflection element having a pair of transparent boards arranged in a mutually opposing manner. A liquid crystal layer is filled between the boards and forms a chiral smectic C phase. An orientation film orients liquid... | 12/18/2007 |
| 7292751 | Optical coupled-resonator filters with asymmetric coupling An optical filter includes at least one waveguide structure. The optical filter also includes a plurality of optical resonators that are aligned in an coupled arrangement with the at least one waveguide structure so as to produce an asymmetric distribution of coupli... | 11/06/2007 |
| 7281807 | Positionable projection display devices Described herein are devices that provide projection-type video output in a portable and flexible design. The design includes a projection chamber, a base, and an interface that permits relative positioning between the projection chamber and base. The base maintains... | 10/16/2007 |
| 7271949 | Multi-wavelength light source and wavelength division multiplexing system using the same A multi-wavelength light source includes an amplifier for generating light over a wide wavelength range; and, an optical fiber grating including a plurality of gratings formed on an optical fiber in in parallel with each other, thereby dividing the light inputted fr... | 09/18/2007 |
| 7244028 | Laser illuminated projection displays A projection video display includes at least one laser for delivering a light beam. The display includes a beam homogenizer and a condenser lens. A scanning arrangement is provided for scanning the light in beam in a particular pattern over the condenser lens in a m... | 07/17/2007 |
| 7245787 | Bias adjustment method for optical SSB modulator or optical FSK modulator A method of appropriately adjusting a bias signal of an optical modulator is provided. For an optical modulator provided with a first sub Mach-Zehnder waveguide, a second sub Mach-Zehnder waveguide and a main Mach-Zehnder waveguide, a predetermined signal is supplie... | 07/17/2007 |
| 7224506 | Single side band modulation device A single side band modulation device includes a first Mach Zehnder interferometer and a second Mach Zehnder interferometer. The first Mach Zehnder interferometer includes at least two output arms, and the second Mach Zehnder interferometer includes at least two outp... | 05/29/2007 |
| 7221495 | Thin film precursor stack for MEMS manufacturing This invention provides a precursor film stack for use in the production of MEMS devices. The precursor film stack comprises a carrier substrate, a first layer formed on the carrier substrate, a second layer of an insulator material formed on the first layer, and a ... | 05/22/2007 |
| 7218653 | Wavelength conversion method and wavelength conversion element An ultraviolet laser is provided that increases the conversion efficiency of laser beams when harmonics having wavelengths of less than 355 nm are generated by converting laser beams with a wavelength conversion element made of a single crystal of lithium tetraborat... | 05/15/2007 |
| 7215383 | Coherent light despeckling A display device or a receiver device for use with coherent light. A controller applies phase shift values to a multi-region phase array at a frequency sufficiently higher than the flicker fusion rate of the human eye or other intended receiver in order to remove th... | 05/08/2007 |
| 7202996 | Optical amplifier For setting the optical gain of an optical amplifier such as a Raman amplifier that is connected in a wavelength division multiplexing (WDM) system, the gain of the amplifier is made dependent on the states of optical polarizers connected to individual inputs of a W... | 04/10/2007 |
| 7202979 | Optical rotational position information detecting apparatus An apparatus for optically detecting rotational position information of a rotating object, includes a light source, a detector which is located at a position to receive scattered light from the rotating object when the rotating object is irradiated with a light beam... | 04/10/2007 |
| 7193879 | Techniques for multiple frequency chirp readout of material with inhomogeneously broadened absorption spectrum Techniques for reading the spectral content of a spatial-spectral grating in an inhomogeneously broadened transition (IBT) material include directing multiple probe waveforms to probe a spatial mode of the IBT material. Each probe waveform is a linear frequency modu... | 03/20/2007 |
| 7180648 | Electro-absorption modulator device and methods for fabricating the same An electro-absorption light intensity modulator device is provided that comprises a first and a second layer disposed relative to the first layer so as to provide a light-absorbing optical confinement region. The first layer comprises a first insulator layer, and th... | 02/20/2007 |
| 7164520 | Packaging for an interferometric modulator A package is made of a transparent substrate having an interferometric modulator and a back plate. A non-hermetic seal joins the back plate to the substrate to form a package, and a desiccant resides inside the package. A method of packaging an interferometric modul... | 01/16/2007 |
| 7139115 | Athermalization of an optical parametric oscillator A method for thermally stabilizing an optical parametric oscillator (OPO) 10 to maintain constant optical path length for stable high power output places a beam dump 32 outside an OPO cavity 18. The OPO 10 has a nonlinear crystal 22 | 11/21/2006 |
| 7126739 | Method and apparatus for optical pulse characterization using simplified chronocyclic tomography A method and apparatus for characterizing light from an optical source using simplified chronocyclic tomography by modulating the phase of light from an optical source using alternating positive and negative quadratic temporal phase modulation at a desired alternati... | 10/24/2006 |
| 7126738 | Visible spectrum modulator arrays Light in the visible spectrum is modulated using an array of modulation elements, and control circuitry connected to the array for controlling each of the modulation elements independently, each of the modulation elements having a surface which is caused to exhibit ... | 10/24/2006 |
| 7106397 | Liquid crystal display device having a polarization member that includes a cholesteric liquid crystal layer and solid optical rotatory film The present invention provides a polarizing member constituted by, at least, a cholesteric liquid-crystal layer (1), a quarter-wave plate (2), and an optical rotatory layer (3). By the polarizing member according to the present invention, the pl... | 09/12/2006 |
| 7102755 | Method for determining power of modulated signals from a frequency transformed interferogram A method determines power of a modulated signal that is applied to a wavelength meter by summing bin values within a designated bin range of a frequency transformed interferogram representing the modulated signal and provided by the wavelength meter. In a first embo... | 09/05/2006 |
| 7092643 | Optical transmission apparatus and bias voltage control method for the optical modulator The optical transmission apparatus has a Mach-Zehnder optical modulator, a light source for applying an optical signal of a continuous light to the optical modulator, a driving circuit for inputting a driving signal into the optical modulator, a branching filter for... | 08/15/2006 |
| 7092344 | Apparatus for creating a multi-dimensional data signal An optical disk drive (101) is disclosed which has essentially no seek time. The drive utilizes a Virtual Head (VH) (103) which is capable of accessing any and/or all tracks in an optical disk (111) at any time. The drive utilizes a procedure by... | 08/15/2006 |
| 7079772 | Optical signal generator with stabilized carrier frequency output Method and apparatus for stabilizing an optical carrier frequency of a generated carrier signal with respect to a target carrier frequency. The apparatus includes a multi-channel optical filter for filtering the generated carrier signal, thereby to provide a first f... | 07/18/2006 |
| 7068412 | Multi-wavelength generating method and apparatus based on flattening of optical spectrum With respect to the relative intensity noise (RIN) for inputs to an optical modulator or the signal-to-noise ratio (SNR) for outputs therefrom, the optical modulator modulating coherent lights of different wavelengths obtained by slicing a spectrum of the multi-wave... | 06/27/2006 |
| 7046414 | Optical modulation system applying a highly stable bias voltage to an optical modulator An optical modulator is driven by applying, to a first signal electrode, an amplitude-modulated input driving signal waveform, which has a pair of same phase envelope lines, and which has a full width smaller than a potential difference between adjacent two of bias ... | 05/16/2006 |
| 7026609 | Method and apparatus for time-phased constant IR energy delta source The present invention comprises apparatus for calibrating a railway infrared hot box or hot wheel detector by delivering a desired radiant energy delta to the hot box detector. The apparatus comprises a solid state radiant energy source adapted to be positioned adja... | 04/11/2006 |
| 7026756 | Light emitting device with blue light LED and phosphor components A light emitting device includes a light emitting component having an active layer of a semiconductor and a phosphor capable of absorbing a part of light emitted from the light emitting component and emitting light of wavelength different from that of the absorbed l... | 04/11/2006 |
| 7024056 | Electro-optic gating arrangement with improved duty cycle The device includes an oscillator (1) to generate an electrical signal of a predetermined frequency and a signal divider (2) to split the electrical signal into first and second signals. The frequency of the second signal is tripled by tripler (3 | 04/04/2006 |
| 7023601 | Optical E-field modulation using a Mach-Zehnder interferometer A method for modulating the E-field of an optical carrier signal utilizes a Mach-Zehnder modulator having a pair of independently controllable branches. A pair of independent branch drive signals VL(t) and VR(t) are derived. Each branch of the ... | 04/04/2006 |
| 7018745 | Controlled phase delay between beams for writing bragg gratings A method of writing an extended grating structure in a photosensitive waveguide comprising the steps of utilizing at least two overlapping beams of light to form an interference pattern, moving the waveguide through said overlapping beams, simultaneously controlling... | 03/28/2006 |
