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).
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Patent number: 9052521Abstract: 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: GrantFiled: June 7, 2010Date of Patent: June 9, 2015Assignee: PRYSM, INC.Inventors: Roger Hajjar, Chris Butler, Brian Tremaine
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Publication number: 20110298695Abstract: 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: ApplicationFiled: June 7, 2010Publication date: December 8, 2011Inventors: Roger Hajjar, Chris Butler, Brian Tremaine
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Publication number: 20080008415Abstract: 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: ApplicationFiled: August 31, 2006Publication date: January 10, 2008Inventors: Joseph Davis, Brian Tremaine
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Patent number: 7263253Abstract: 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: GrantFiled: April 11, 2005Date of Patent: August 28, 2007Assignee: Capella Photonics, Inc.Inventors: Joseph E. Davis, Mark H. Garrett, Brian Tremaine, Michael Darling
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Publication number: 20070166034Abstract: 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: ApplicationFiled: August 3, 2005Publication date: July 19, 2007Applicant: Capella Photonics, Inc.Inventor: Brian Tremaine
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Publication number: 20060228072Abstract: 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: ApplicationFiled: April 11, 2005Publication date: October 12, 2006Inventors: Joseph Davis, Mark Garrett, Brian Tremaine, Michael Darling
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Publication number: 20060228071Abstract: 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: ApplicationFiled: December 22, 2005Publication date: October 12, 2006Inventors: Joseph Davis, Brian Tremaine
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Patent number: 6975787Abstract: 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: GrantFiled: November 7, 2002Date of Patent: December 13, 2005Assignee: Nortel Networks LimitedInventor: Brian Tremaine
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Publication number: 20050100268Abstract: 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: ApplicationFiled: March 27, 2003Publication date: May 12, 2005Inventors: Jack Foster, Armand Neukermans, Brian Tremaine, Art Wagner
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Publication number: 20040202055Abstract: 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: ApplicationFiled: April 12, 2004Publication date: October 14, 2004Applicant: Terastor Corporation, a California CorporationInventors: Gordon R. Knight, John Al-Samrrie, David Blankenbeckler, Brian Bonn, Alan Burroughs, Warren Dalziel, Roger Hajjar, Amit Jain, Guolin Ma, Brian Tremaine
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Publication number: 20030185496Abstract: 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: ApplicationFiled: November 7, 2002Publication date: October 2, 2003Inventor: Brian Tremaine
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Patent number: 6449221Abstract: 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: GrantFiled: February 9, 2000Date of Patent: September 10, 2002Assignee: Terastor CorporationInventors: Gordon R. Knight, John Al-Samarrie, David Blankenbeckler, Brian Bonn, Alan Burroughs, Warren Dalziel, Roger Hajjar, Amit Jain, Guolin Ma, Brian Tremaine
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Mechanism for controlling spacing between optical head and storage medium in optical storage systems
Patent number: 6396783Abstract: 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: GrantFiled: September 23, 1999Date of Patent: May 28, 2002Assignee: Terastor CorporationInventors: Bernard W. Bell, Jr., Vlad Novotny, Hossein Moghadam, Roger Hajjar, Yung-Chieh Hsieh, Brian Tremaine -
Patent number: 6243350Abstract: 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: GrantFiled: April 29, 1997Date of Patent: June 5, 2001Assignee: TeraStor CorporationInventors: Gordon R. Knight, John Al-Samarrie, David Blankenbeckler, Brian Bonn, Alan Burroughs, Warren Dalziel, Roger Hajjar, Amit Jain, Guolin Ma, Brian Tremaine