Patents by Inventor John Sweetser

John Sweetser 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: 20060002653
    Abstract: Optical circuits having a flat wavelength response are disclosed. A disclosed apparatus includes a first optical coupler, first and second optical waveguides optically coupled to the first optical coupler and a second optical coupler optically coupled to the first and second optical waveguides. The first optical coupler couples input light into a first portion and a second portion. The first and second optical waveguides receive the first and second portions of input light from the first optical coupler, respectively the second optical coupler couples the first portion of input light from the first optical waveguide and the second portion of input light from the second optical waveguide. The second optical waveguide may effect a fixed phase difference of one-half wavelength relative to the input light. The first and second optical couplers may have first and second wavelength dependences, respectively, where the second wavelength dependence is opposite the first wavelength dependence.
    Type: Application
    Filed: June 30, 2004
    Publication date: January 5, 2006
    Inventors: Anders Grunnet-Jepsen, John Sweetser
  • Patent number: 6980355
    Abstract: A signal may be split by a splitter into a plurality of output signals. Each of these output signals may then be amplified. Amplified spontaneous emission noise may be removed using a tunable filter for each of the signal outputs. As a result, an output signal may be provided with greater power so that, in some embodiments, a single split signal may be utilized to service more end users.
    Type: Grant
    Filed: February 28, 2003
    Date of Patent: December 27, 2005
    Assignee: Intel Corporation
    Inventors: Achintya K. Bhowmik, Dmitri E. Nikonov, Shida Tan, John Sweetser
  • Publication number: 20050147348
    Abstract: A variable-reflective tunable optical filter includes an interferometer adapted to control the powers of added or dropped signals and an optical waveguide grating to select the wavelength channels of the added or dropped signals. The waveguide grating is tunable to filter a dropped signal from an input data stream and filter an added signal into an output data stream. While a reflection band of the waveguide grating is being adjusted to tune a wavelength channel, the phase of at least one leg of the interferometer may be adjusted to direct signals of any wavelength channel selected by said waveguide from the input data stream to the output data stream, thereby providing hitless optical add-drop multiplexing.
    Type: Application
    Filed: December 30, 2003
    Publication date: July 7, 2005
    Inventors: Anders Grunnet-Jepsen, John Sweetser
  • Publication number: 20050129365
    Abstract: A mounting platform provides support and packaging for one or more fiber Bragg gratings and electronic circuitry (e.g., heaters, coolers, piezoelectric strain providers, temperature and strain sensors, feedback circuitry, control loops), which may be printed on or on the mounting platform, embedded in the mounting platform, or may be an “off-board” chip solution (e.g., the electronic circuitry may be attached to the mounting platform, but not formed on or defined on the mounting platform). The fiber Bragg gratings are held in close proximity to the electronic circuitry, which applies local and global temperature and/or strain variations to the fiber Bragg gratings to, for example, stabilize and/or tune spectral properties of the fiber Bragg gratings so that spatial variations in the fiber Bragg gratings that result from processing and manufacturing fluctuations and tolerances can be compensated for.
    Type: Application
    Filed: January 21, 2005
    Publication date: June 16, 2005
    Inventors: Alan Johnson, Anders Grunnet-Jepsen, Tsung-Ein Tsai, John Sweetser, Matthew Miller
  • Publication number: 20050025429
    Abstract: A planar light wave circuit may be formed with a pair of waveguides arranged in close proximity to one another. At least one of the waveguides may be segmented. Through segmentation, the average mode-field diameter may be adjusted. Controlling the average mode-field diameter enables precise control over the coupling characteristics.
    Type: Application
    Filed: July 29, 2003
    Publication date: February 3, 2005
    Inventors: Anders Jepsen, Craig Liddle, John Sweetser
  • Publication number: 20050008977
    Abstract: Multiple Bragg gratings are fabricated in a single planar lightwave circuit platform. The gratings have nominally identical grating spacing but different center wavelengths, which are produced using controlled photolithographic processes and/or controlled doping to control the effective refractive index of the gratings. The gratings may be spaced closer together than the height of the UV light pattern used to write the gratings.
    Type: Application
    Filed: August 3, 2004
    Publication date: January 13, 2005
    Inventors: Anders Grunnet-Jepsen, Alan Johnson, John Sweetser
  • Publication number: 20050008295
    Abstract: Multiple Bragg gratings are fabricated in a single planar lightwave circuit platform. The gratings have nominally identical grating spacing but different center wavelengths, which are produced using controlled photolithographic processes and/or controlled doping to control the effective refractive index of the gratings. The gratings may be spaced closer together than the height of the UV light pattern used to write the gratings.
    Type: Application
    Filed: August 3, 2004
    Publication date: January 13, 2005
    Inventors: Anders Grunnet-Jepsen, Alan Johnson, John Sweetser
  • Publication number: 20040256544
    Abstract: A tunable filter may be utilized to successively tune to different wavelengths. As each wavelength of the wavelength division multiplexed signal is extracted, it may be successively power monitored. Thus, power monitoring may done without requiring separate power monitors for each channel. This results in considerable advantages in some embodiments, including reduced size, reduced complexities in fabrication, and reduced yield issues in some embodiments.
    Type: Application
    Filed: June 19, 2003
    Publication date: December 23, 2004
    Inventors: Ruolin Li, Anders Grunnet-Jepsen, John Sweetser, Ut Tran
  • Publication number: 20040212876
    Abstract: A signal may be split by a splitter into a plurality of output signals. Each of these output signals may then be amplified. Amplified spontaneous emission noise may be removed using a tunable filter for each of the signal outputs. As a result, an output signal may be provided with greater power so that, in some embodiments, a single split signal may be utilized to service more end users.
    Type: Application
    Filed: February 28, 2003
    Publication date: October 28, 2004
    Inventors: Achintya K. Bhowmik, Dmitri E. Nikonov, Shida Tan, John Sweetser
  • Publication number: 20030058248
    Abstract: The present invention is generally directed to a system and method for communicating video across one or more computer networks. Broadly, the system comprises a frame buffer memory for storing and maintaining a previous frame of graphics information, a temporary memory configured to store at least a portion of a current frame of graphics information, comparison logic for comparing a portion of the current frame of graphics information with a corresponding portion of the previous frame, and transmission logic for transmitting the portion of the current frame to a destination computer, if the comparison logic determines that the portion of the current frame of graphics information differs from the corresponding portion of the previous frame by more than a predetermined measure.
    Type: Application
    Filed: September 21, 2001
    Publication date: March 27, 2003
    Inventors: Roland M. Hochmuth, John Marks, David John Sweetser
  • Patent number: 6314220
    Abstract: A waveguide that is operative to produce a reflected optical signal having a spectral profile corresponding to a product of a spectral profile of an input optical signal and a predetermined complex-valued spectral filtering function wherein the waveguide includes a plurality of spatially distinct subgratings each possessing a periodic array of diffraction elements. The subgratings are situated and configured based on the predetermined complex-valued spectral filtering function.
    Type: Grant
    Filed: July 22, 1998
    Date of Patent: November 6, 2001
    Assignee: Templex Technology, Inc.
    Inventors: Thomas Mossberg, Michael Munroe, Anders Grunnet-Jepsen, John Sweetser
  • Patent number: 6160656
    Abstract: Methods and apparatus are provided for the recognition of an optical signal that is encoded with a specified temporal pattern. Nonlinear optical interactions and time-integrating optical detectors are used to identify temporally short correlation peaks in an optical signal in an optical communication system without temporally resolving the correlation signal. The apparatus includes means for decoding an encoded optical waveform, a time-integrating nonlinear detection system, a time-integrating linear detection system for proper normalization, and thresholding electronics that produce voltage pulses corresponding to the presence of specified waveforms at the detector input.
    Type: Grant
    Filed: August 10, 1998
    Date of Patent: December 12, 2000
    Assignee: Templex Technology, Inc.
    Inventors: Thomas Mossberg, Michael Munroe, Anders Grunnet-Jepsen, John Sweetser