Patents by Inventor Asif A. Godil

Asif A. Godil has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20020061166
    Abstract: A beam refraction apparatus includes an input fiber carrying an input beam. A wavelength dispersive element is coupled to the input fiber. The wavelength dispersive element spreads the input beam in at least one dimension as a function of wavelength and generates a dispersed beam. A controllable grating reflects the dispersed beam to the wavelength dispersive element and generates a recombined beam. The controllable grating provides a controllable reflectivity as a function of wavelength. An output fiber receives the recombined beam. A collimating optical member is coupled to the input and output fibers. The collimating optical member passes the input beam and the recombined beams in parallel and opposite directions.
    Type: Application
    Filed: July 6, 2001
    Publication date: May 23, 2002
    Inventors: Eric K. Gustafson, Asif A. Godil
  • Publication number: 20020015216
    Abstract: Various embodiments are disclosed of apparatuses and methods for linearization. A linearized signal can control, for example, a microelectromechanical device, a microelectromechanical device, and/or a device controlling a modulated intensity of electromagnetic energy. Some embodiments include linearization functions such as a logarithm or x/(a+x).
    Type: Application
    Filed: May 14, 2001
    Publication date: February 7, 2002
    Inventors: Benjamin Wai-Ho Chui, Timothy Stowe, Asif A. Godil
  • Patent number: 6268952
    Abstract: An optical switch uses a micromachined adjustable phase hologram device to route optical signals from an input fiber to selected output fibers is described. The adjustable phase hologram includes a large number of micromachined reflective ribbons which can be individually controlled and adjusted to produce a wide range of phase profiles to route the light beams from the input fiber. This optical switch is capable of dealing directly with optical signals, has fast switching speeds, is capable of routing WDM input signals, is polarization independent, is scalable to large switches, and avoids the complexity of other switches.
    Type: Grant
    Filed: July 14, 1999
    Date of Patent: July 31, 2001
    Assignee: Lightconnect, Inc.
    Inventors: Asif A. Godil, David M. Bloom
  • Patent number: 6215579
    Abstract: An apparatus and method for modulating an incident light beam for forming a two-dimensional projection image. The apparatus includes a plurality of elongated elements each having a reflective surface. The elongated elements are suspended substantially parallel to each other above a substrate with their respective ends supported, forming a column of adjacent reflecting surfaces grouped according to display elements. Alternate ones of each group are deformable by a applying a voltage with respect to the substrate. An approximately flat center section of each deformed element is substantially parallel to and a predetermined distance from a center section of each undeformed element. Limiting the predetermined distance avoids hysteresis in deforming the elements and avoids adhesion of the elements to the substrate.
    Type: Grant
    Filed: June 24, 1998
    Date of Patent: April 10, 2001
    Assignee: Silicon Light Machines
    Inventors: David M. Bloom, Asif Godil
  • Patent number: 6169624
    Abstract: Micromachined grating modulators which exhibit achromatic behavior are described. One embodiment includes narrow and wide ribbons suspended above a substrate and alternatingly interleaved with each other. Narrow and wide reflective surfaces are formed on the narrow and wide ribbons. Compensating reflective surfaces are formed in the gaps between and beneath the ribbons. The width of the ribbons as well as the width of the gaps and the compensating reflecting surfaces are designed so that incident optical beam can be modulated or attenuated in an achromatic fashion.
    Type: Grant
    Filed: August 11, 1999
    Date of Patent: January 2, 2001
    Inventors: Asif A. Godil, David M. Bloom
  • Patent number: 6040914
    Abstract: A laser absorption sensor system for performing optical measurements on a sample is described. The sensor system includes a tunable laser, capable of being tuned at rates exceeding 1 KHZ, and with a tuning range approaching 1 GHz. The laser beam is modulated at a modulation frequency between 1 and 100 KHz. Modulation in this frequency range is termed wavelength modulation. The beam is split into two beams, a signal beam and a reference beam. The signal beam traverses the sample where characteristic absorption takes place and is incident on a signal photodetector. The reference beam is incident directly on a reference photodetector. A noise cancellation circuit combines signal and reference photo-currents from signal and reference photodetectors reducing signal noise and increasing system sensitivity. The combination of wavelength modulation and the noise cancellation scheme provide a highly sensitive simple, rugged, low cost laser absorption sensor system.
    Type: Grant
    Filed: June 10, 1997
    Date of Patent: March 21, 2000
    Assignee: New Focus, Inc.
    Inventors: Michael L. Bortz, Asif A. Godil
  • Patent number: 5982553
    Abstract: A display system for providing a two dimensional image includes an essentially one dimensional light valve array. The diffractive light valve array includes modulator elements which diffract or reflect light incident thereon to an extent determined by an image element to be represented. The display system is arranged such diffracted light from the light-valve array passes through a magnifying lens and is separated from the reflected light from the array. A magnified virtual image of the array formed by the diffracted light is viewed through the magnifying lens. A scanning arrangement between the viewer and the magnifying lens scans the image of the light-valve array across the field of view of the viewer sufficiently quickly that the viewer perceives the scanned image as a two-dimensional image. In another arrangement a printer is formed by scanning a real image of the diffractive light valve array over a printing or recording medium.
    Type: Grant
    Filed: March 20, 1997
    Date of Patent: November 9, 1999
    Assignee: Silicon Light Machines
    Inventors: David M. Bloom, Asif A. Godil
  • Patent number: 5764280
    Abstract: A display device includes a plurality of modulatable light sources providing a one-dimensional array of display-elements, and a scanning unit, carried or worn by the user, which causes the user to perceive the array as a two-dimensional image. The scanning unit is movable with respect to the array while still allowing the user to view the array as a two-dimensional image.
    Type: Grant
    Filed: March 20, 1997
    Date of Patent: June 9, 1998
    Assignee: Silicon Light Machines Inc.
    Inventors: David M. Bloom, Asif A. Godil
  • Patent number: 5621744
    Abstract: A continuous-wave ultraviolet laser light generating apparatus includes a laser light source unit (1) for generating laser light from visible light to near-infrared light, a wavelength converting means (4) which includes an optical resonator (2) and a wavelength convertor (3) disposed in the optical resonator (2) for converting a wavelength of incident laser light and which converts the laser light from the laser light source unit (1) into continuous-wave ultraviolet laser light L.sub.UL to emit the latter, a locking means (5) for adjusting the optical resonator (2) so as to have a predetermined cavity length, and an electrooptic phase modulator (6) for modulating a phase of the laser light from the laser light source unit in response to a resonance frequency of the optical resonator. The electrooptic phase modulator (6) is made of an electrooptic crystal (11) having a composition of ATiOXO.sub.4 where A depicts any one of K, Cs and Rb and X depicts any one of P and As.
    Type: Grant
    Filed: October 17, 1995
    Date of Patent: April 15, 1997
    Assignee: Sony Corporation
    Inventors: Hiroki Kikuchi, Asif A. Godil, Michio Oka
  • Patent number: 5526169
    Abstract: An electro-optical modulator has an electro-optical crystal having an optical path, and a pair of electrodes disposed one on each side of the optical path for applying a signal voltage therebetween. At least one of the electrodes is formed on a side surface of a groove defined along the optical path of the electro-optical crystal.
    Type: Grant
    Filed: October 12, 1994
    Date of Patent: June 11, 1996
    Assignee: Sony Corporation
    Inventors: Hiroki Kikuchi, Asif A. Godil, Tatsuo Fukui
  • Patent number: 5414552
    Abstract: An elegant design for an optical modulator having a high Q is described. The modulator is made up of a straight-forward microwave guide within which a block of a monocrystalline electro-optic material such as lithium niobate is positioned. The modulator is dimensioned to support sequentially standing waves of modulating energy within the desired bandwidth. Optical radiation to be modulated is introduced into the crystal. In one embodiment designed particularly for the 2-15 GHz range, the amount of crystalline material necessary to interact with the incoming radiation is selected to be a minimum, and in another embodiment designed for the 15-75 GHz frequency range, a zig-zag reflection pattern is provided within the crystal.
    Type: Grant
    Filed: December 27, 1993
    Date of Patent: May 9, 1995
    Assignee: The Board of Trustees of the Leland Stanford, Jr. University
    Inventor: Asif A. Godil
  • Patent number: 4991923
    Abstract: An acousto-optic device which is incorporated into a fiber optic system to define, based upon device configuration, an element such as a phase modulator, optical tap, frequency shifter or mode coupler. The device comprises an acoustic transmission member having a groove therein which is secured in the Hertzian contact along a continuous portion of its surface with an optical waveguide so as to communicate acoustic signals from a transducer affixed on the member through the Hertzian contact area and into the optical waveguide. In one preferred embodiment the member comprises a capillary tube having a bore that is substantially the same diameter as the optical waveguide to which the device is to be affixed. A portion of the capillary tube is removed to expose the base, thereby defining a groove along the capillary substrate. In one preferred embodiment an acoustic transducer is deposited on the curved surface opposite the groove to focus acoustic signals from the transducer toward the groove.
    Type: Grant
    Filed: January 17, 1989
    Date of Patent: February 12, 1991
    Assignee: Board of Trustees of the Leland Stanford Junior University
    Inventors: Gordon S. Kino, Guo Q. Xiao, Butrus T. Khuri-Yakub, David B. Patterson, Asif A. Godil