Patents by Inventor Brian Tremaine

Brian Tremaine 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).

  • Patent number: 9052521
    Abstract: A laser-based display device includes a plurality of ultraviolet lasers configured to excite a phosphor-containing display screen in order to produce visible light. The laser-based display device also includes a reference laser used for calibration operations. A control system within the laser-based display device causes the reference laser beam to scan across one or more calibration features, and adjusts optical components of the laser-based display device, including activation timing of the ultraviolet lasers, based on feedback patterns generated by the calibration features, to compensate for drift effects. The calibration features may be disposed off-screen or on-screen.
    Type: Grant
    Filed: June 7, 2010
    Date of Patent: June 9, 2015
    Assignee: PRYSM, INC.
    Inventors: Roger Hajjar, Chris Butler, Brian Tremaine
  • Publication number: 20110298695
    Abstract: A laser-based display device includes a plurality of ultraviolet lasers configured to excite a phosphor-containing display screen in order to produce visible light. The laser-based display device also includes a reference laser used for calibration operations. A control system within the laser-based display device causes the reference laser beam to scan across one or more calibration features, and adjusts optical components of the laser-based display device, including activation timing of the ultraviolet lasers, based on feedback patterns generated by the calibration features, to compensate for drift effects. The calibration features may be disposed off-screen or on-screen.
    Type: Application
    Filed: June 7, 2010
    Publication date: December 8, 2011
    Inventors: Roger Hajjar, Chris Butler, Brian Tremaine
  • Publication number: 20080008415
    Abstract: Effects of diffraction of a spectral beam from an edge of the micromirrors are reduced in order to optimize the passband in a wavelength selective switch. The effects of diffraction on the pass band may be reduced by using rotation of the micromirror about both the attenuation axis and the switching axis to achieve the desired level of attenuation. Peak coupling can be attained by dithering the micromirror about a dither axis that is tangent to a contour of constant attenuation using simultaneous rotation about the switching and attenuation axes. A power level of a spectral channel may be attenuated by rotating the channel micromirror with respect to an effective attenuation axis that is non-orthogonal to the dither axis through a combination of rotations about the switching axis and the attenuation axis.
    Type: Application
    Filed: August 31, 2006
    Publication date: January 10, 2008
    Inventors: Joseph Davis, Brian Tremaine
  • Patent number: 7263253
    Abstract: A wavelength selective switch architecture for ROADMs for switching the spectral channels of a multi-channel, multi-wavelength optical signal between input and output ports employs a biaxial MEMS port mirror array for optimal coupling efficiency and ITU grid alignment, an anamorphic beam expander for expanding input optical signals to create an elongated beam profile, a diffraction grating for spatially separating the spectral channels, an anamorphic focusing lens system, an array of biaxial elongated channel MEMS micromirrors, a built-in Optical Channel Monitor, and an electronic feedback control system. The bi-axial channel micromirrors are rotatable about one axis to switch spectral channels between ports, and are rotatable about an orthogonal axis to vary the coupling of the spectral channel to an output port and control attenuation of the spectral signal for complete blocking or for a predetermined power level.
    Type: Grant
    Filed: April 11, 2005
    Date of Patent: August 28, 2007
    Assignee: Capella Photonics, Inc.
    Inventors: Joseph E. Davis, Mark H. Garrett, Brian Tremaine, Michael Darling
  • Publication number: 20070166034
    Abstract: Methods for adjusting dither amplitude for MEMS mirrors in optical switches and optical switches employing such a method are disclosed. A dither amplitude of one or more MEMS mirrors may be adjusted in an optical switch having an input port, and an array of one or more MEMS mirrors that can be selectively optically coupled to one or more of N?3 optical input/output (I/O) ports. The MEMS mirrors are aligned mirrors to achieve nominal peak coupling at each of the N collimators. Digital-to-analog (DAC) settings for positioning mirrors in an open control loop as a function of the selected collimator are stored to a non-volatile memory. The DAC settings are used to determine a dither amplitude DITHER(x) for one of the MEMS mirrors positioned to couple optical signals to an output port at a position x.
    Type: Application
    Filed: August 3, 2005
    Publication date: July 19, 2007
    Applicant: Capella Photonics, Inc.
    Inventor: Brian Tremaine
  • Publication number: 20060228071
    Abstract: Effects of diffraction of a spectral beam from an edge of the micromirrors are reduced in order to optimize the passband in a wavelength selective switch. The effects of diffraction on the pass band may be reduced by appropriate modification of the edges of the micromirrors, by modification of the input and/or output ports to allow for attenuation by rotation of the micromirror about the switching axis, by using rotation of the micromirror about both the attenuation axis and the switching axis to achieve the desired level of attenuation, by inserting an aperture at a focal plane or external to the device to reduce the magnitude of the micromirror edge diffraction transmitted to any or all output ports, or by appropriate filtering of angular frequencies with a diffraction grating used to separate a multi-channel optical signal into constituent spectral beams.
    Type: Application
    Filed: December 22, 2005
    Publication date: October 12, 2006
    Inventors: Joseph Davis, Brian Tremaine
  • Publication number: 20060228072
    Abstract: A wavelength selective switch architecture for ROADMs for switching the spectral channels of a multi-channel, multi-wavelength optical signal between input and output ports employs a biaxial MEMS port mirror array for optimal coupling efficiency and ITU grid alignment, an anamorphic beam expander for expanding input optical signals to create an elongated beam profile, a diffraction grating for spatially separating the spectral channels, an anamorphic focusing lens system, an array of biaxial elongated channel MEMS micromirrors, a built-in Optical Channel Monitor, and an electronic feedback control system. The bi-axial channel micromirrors are rotatable about one axis to switch spectral channels between ports, and are rotatable about an orthogonal axis to vary the coupling of the spectral channel to an output port and control attenuation of the spectral signal for complete blocking or for a predetermined power level.
    Type: Application
    Filed: April 11, 2005
    Publication date: October 12, 2006
    Inventors: Joseph Davis, Mark Garrett, Brian Tremaine, Michael Darling
  • Patent number: 6975787
    Abstract: Described is a method for controlling the angular position of a mirror. The method includes sensing the angular position of the mirror, generating a first linear control signal in response to the angular position and generating a first non-linear control signal to position the mirror. The method can also include generating a second linear control signal in response to the angular position and generating a second non-linear control signal to position the mirror. Generation of the linear control signal is based on conventional linear systems techniques. The method can be applied to mirror arrays in which the generation of the non-linear control signal is adapted for mirror performance variations.
    Type: Grant
    Filed: November 7, 2002
    Date of Patent: December 13, 2005
    Assignee: Nortel Networks Limited
    Inventor: Brian Tremaine
  • Publication number: 20050100268
    Abstract: Apparatus and methods are disclosed for selectively positioning a collimator body. The apparatus comprises support means adjustably supporting the collimator body; and adjustment means for selectively adjusting the collimator body, the adjustment means comprising an actuator component having a driver coil and a magnetic structure with a first gap formed therebetween; wherein an electrical current through the driver coil of the actuator component causes the collimator body to move perpendicular to a magnetic field created by the magnetic structure of the actuator component. The method comprises supporting the collimator; and adjusting the collimator body using an actuator component having a driver coil and a magnetic structure with a first gap formed therebetween; wherein an electrical current through the driver coil of the actuator component causes the collimator body to move perpendicular to a magnetic field created by the magnetic structure of the actuator component.
    Type: Application
    Filed: March 27, 2003
    Publication date: May 12, 2005
    Inventors: Jack Foster, Armand Neukermans, Brian Tremaine, Art Wagner
  • Publication number: 20040202055
    Abstract: This application describes structures of storage media for optical storage systems, including systems in the near-field configuration to couple radiation between the optical head and the media at least in part by evanescent fields. Disk cartridges for various optical disk drives are also described.
    Type: Application
    Filed: April 12, 2004
    Publication date: October 14, 2004
    Applicant: Terastor Corporation, a California Corporation
    Inventors: Gordon R. Knight, John Al-Samrrie, David Blankenbeckler, Brian Bonn, Alan Burroughs, Warren Dalziel, Roger Hajjar, Amit Jain, Guolin Ma, Brian Tremaine
  • Publication number: 20030185496
    Abstract: Described is a method for controlling the angular position of a mirror. The method includes sensing the angular position of the mirror, generating a first linear control signal in response to the angular position and generating a first non-linear control signal to position the mirror. The method can also include generating a second linear control signal in response to the angular position and generating a second non-linear control signal to position the mirror. Generation of the linear control signal is based on conventional linear systems techniques. The method can be applied to mirror arrays in which the generation of the non-linear control signal is adapted for mirror performance variations.
    Type: Application
    Filed: November 7, 2002
    Publication date: October 2, 2003
    Inventor: Brian Tremaine
  • Patent number: 6449221
    Abstract: Magneto-optical storage media designed for optical storage systems such as disk drives with optical flying heads. Dielectric layers are designed and implemented to maximize optical coupling between the flying optical head and the media and to reduce variations of signals with flight height of the flying optical head.
    Type: Grant
    Filed: February 9, 2000
    Date of Patent: September 10, 2002
    Assignee: Terastor Corporation
    Inventors: Gordon R. Knight, John Al-Samarrie, David Blankenbeckler, Brian Bonn, Alan Burroughs, Warren Dalziel, Roger Hajjar, Amit Jain, Guolin Ma, Brian Tremaine
  • Patent number: 6396783
    Abstract: An optical disk drive having a thermal control mechanism on the optical head to control the spacing between the optical head and the surface of the storage medium.
    Type: Grant
    Filed: September 23, 1999
    Date of Patent: May 28, 2002
    Assignee: Terastor Corporation
    Inventors: Bernard W. Bell, Jr., Vlad Novotny, Hossein Moghadam, Roger Hajjar, Yung-Chieh Hsieh, Brian Tremaine
  • Patent number: 6243350
    Abstract: Optical storage systems based on air-bearing-suspended optical heads in a near-field configuration. Such a system comprises an optical head for reading and writing data and a head positioning system, an optics module including beam relay optics and signal detectors, and a medium holding and loading module to hold an optical medium. An electronic control system is also provided to control the system operation. The optical head includes a near-field lens with a high index of refraction and in a near-field configuration in which the near-field lens has a numerical aperture greater than unity when the spacing between an exit facet of the optical head and a recording layer in the optical medium is a fraction of one wavelength of optical beam.
    Type: Grant
    Filed: April 29, 1997
    Date of Patent: June 5, 2001
    Assignee: TeraStor Corporation
    Inventors: Gordon R. Knight, John Al-Samarrie, David Blankenbeckler, Brian Bonn, Alan Burroughs, Warren Dalziel, Roger Hajjar, Amit Jain, Guolin Ma, Brian Tremaine