Patents by Inventor David W. Dolfi

David W. Dolfi 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: 9184841
    Abstract: An optical communication system, a transmitter, a receiver, and methods of operating the same are provided. In particular, a transmitter is disclosed as being configured to encode optical signals in accordance with a multi-level coding scheme. The receiver is configured to provide skew correction to the optical signals received from the transmitter by dividing a received signal into separate level-specific components and sampling each of the components with distinct sampling blocks.
    Type: Grant
    Filed: September 6, 2013
    Date of Patent: November 10, 2015
    Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.
    Inventors: Mike Allen Robinson, David W. Dolfi
  • Patent number: 9052759
    Abstract: Embodiments of an apparatus are described. In one embodiment, the apparatus is an optical navigation circuit. In particular, the optical navigation circuit may be part of an optical navigation device. The optical navigation circuit includes an image sensor, dynamic reconfiguration logic, and a digital signal processor. The image sensor includes a pixel array to generate a plurality of electrical signals corresponding to incident light at the pixel array. The dynamic reconfiguration logic is coupled to the image sensor. The dynamic reconfiguration logic is configured to receive the plurality of electrical signals from the pixel array and to generate a plurality of reconfigured electrical signals based on the plurality of electrical signals from the pixel array. The digital signal processor is coupled to the dynamic reconfiguration logic. The digital signal processor is configured to receive the plurality of reconfigured electrical signals from the dynamic reconfiguration logic.
    Type: Grant
    Filed: April 11, 2007
    Date of Patent: June 9, 2015
    Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.
    Inventors: Ramakrishna Kakarala, Annette C. Grot, David W. Dolfi
  • Patent number: 8989300
    Abstract: An optical communication system, a transmitter, a receiver, and methods of operating the same are provided. In particular, a transmitter is disclosed as being configured to encode optical signals in accordance with a multi-level coding scheme. The receiver is configured to provide receive and decode to the optical signals received from the transmitter. One or both of the receiver and transmitter are configured to compensate for non-idealities or non-linearities introduced into the communication system by optical components of the system.
    Type: Grant
    Filed: February 6, 2014
    Date of Patent: March 24, 2015
    Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.
    Inventors: Georgios Asmanis, Faouzi Chaahoub, Michael Allen Robinson, David W. Dolfi
  • Publication number: 20150071651
    Abstract: An optical communication system, a transmitter, a receiver, and methods of operating the same are provided. In particular, a transmitter is disclosed as being configured to encode optical signals in accordance with a multi-level coding scheme. The receiver is configured to provide receive and decode to the optical signals received from the transmitter. One or both of the receiver and transmitter are configured to compensate for non-idealities or non-linearities introduced into the communication system by optical components of the system.
    Type: Application
    Filed: February 6, 2014
    Publication date: March 12, 2015
    Applicant: Avago Technologies General IP (Singapore) Pte. Ltd
    Inventors: Georgios Asmanis, Faouzi Chaahoub, Michael Allen Robinson, David W. Dolfi
  • Publication number: 20150071653
    Abstract: An optical communication system, a transmitter, a receiver, and methods of operating the same are provided. In particular, a transmitter is disclosed as being configured to encode optical signals in accordance with a multi-level coding scheme. The receiver is configured to provide skew correction to the optical signals received from the transmitter by dividing a received signal into separate level-specific components and sampling each of the components with distinct sampling blocks.
    Type: Application
    Filed: September 6, 2013
    Publication date: March 12, 2015
    Applicant: Avago Technologies General IP (Singapore) Pte.Ltd.
    Inventors: Mike Allen Robinson, David W. Dolfi
  • Patent number: 7630632
    Abstract: A method for measuring the high speed behavior of fiber optic transceivers and transceiver modules. The method includes providing a fiber optic transceiver, performing one or more low speed performance tests on the fiber optic transceiver at each of a plurality of temperatures across transceiver operating temperature range, and performing a high speed performance test suite on the fiber optic transceiver at a single temperature within the testing temperature range. Based on the low speed performance tests and the high speed performance test suite at the single temperature, the method can determine, via calculation, approximation or prediction, the high speed behavior of the transceiver over temperature. The basis for determining the high speed behavior of the transceiver also can include the measured or available modeled relationships of high speed performance characteristics of at least a portion of the transceiver to the temperature-dependent parameters measured in the low speed performance tests.
    Type: Grant
    Filed: December 19, 2006
    Date of Patent: December 8, 2009
    Assignee: Avago Technologies Fiber IP (Singapore) Pte. Ltd.
    Inventor: David W. Dolfi
  • Patent number: 7567341
    Abstract: A technique for adapting an optical navigation device for navigation on a transparent structure such as a glass plate involves establishing a navigation window for navigation tracking, detecting reflected light within the navigation window, generating an output signal in response to the detected light, and adjusting a characteristic of the navigation window in response to the output signal. An optical navigation device includes an illumination system configured to output light, an image sensor configured to generate an output signal related to a detected portion of the light, and a transparent structure adapter module configured to adjust a navigation window of the image sensor in response to the output signal to adapt the optical navigation device for use directly on an opaque surface or for use on a transparent structure that is located between the optical navigation device and the opaque surface.
    Type: Grant
    Filed: September 28, 2007
    Date of Patent: July 28, 2009
    Assignee: Avago Technologies ECBU IP (Singapore) Pte. ltd.
    Inventors: David W. Dolfi, Ramakrishna Kakarala, Annette Claire Grot
  • Publication number: 20080252602
    Abstract: Embodiments of an apparatus are described. In one embodiment, the apparatus is an optical navigation circuit. In particular, the optical navigation circuit may be part of an optical navigation device. The optical navigation circuit includes an image sensor, dynamic reconfiguration logic, and a digital signal processor. The image sensor includes a pixel array to generate a plurality of electrical signals corresponding to incident light at the pixel array. The dynamic reconfiguration logic is coupled to the image sensor. The dynamic reconfiguration logic is configured to receive the plurality of electrical signals from the pixel array and to generate a plurality of reconfigured electrical signals based on the plurality of electrical signals from the pixel array. The digital signal processor is coupled to the dynamic reconfiguration logic. The digital signal processor is configured to receive the plurality of reconfigured electrical signals from the dynamic reconfiguration logic.
    Type: Application
    Filed: April 11, 2007
    Publication date: October 16, 2008
    Inventors: Ramakrishna Kakarala, Annette C. Grot, David W. Dolfi
  • Publication number: 20080158540
    Abstract: A technique for adapting an optical navigation device for navigation on a transparent structure such as a glass plate involves establishing a navigation window for navigation tracking, detecting reflected light within the navigation window, generating an output signal in response to the detected light, and adjusting a characteristic of the navigation window in response to the output signal. An optical navigation device includes an illumination system configured to output light, an image sensor configured to generate an output signal related to a detected portion of the light, and a transparent structure adapter module configured to adjust a navigation window of the image sensor in response to the output signal to adapt the optical navigation device for use directly on an opaque surface or for use on a transparent structure that is located between the optical navigation device and the opaque surface.
    Type: Application
    Filed: September 28, 2007
    Publication date: July 3, 2008
    Inventors: David W. Dolfi, Ramakrishna Kakarala, Annette Claire Grot
  • Publication number: 20080145059
    Abstract: A method for measuring the high speed behavior of fiber optic transceivers and transceiver modules. The method includes providing a fiber optic transceiver, performing one or more low speed performance tests on the fiber optic transceiver at each of a plurality of temperatures across transceiver operating temperature range, and performing a high speed performance test suite on the fiber optic transceiver at a single temperature within the testing temperature range. Based on the low speed performance tests and the high speed performance test suite at the single temperature, the method can determine, via calculation, approximation or prediction, the high speed behavior of the transceiver over temperature. The basis for determining the high speed behavior of the transceiver also can include the measured or available modeled relationships of high speed performance characteristics of at least a portion of the transceiver to the temperature-dependent parameters measured in the low speed performance tests.
    Type: Application
    Filed: December 19, 2006
    Publication date: June 19, 2008
    Inventor: David W. DOLFI
  • Publication number: 20080065351
    Abstract: Thickness measurement based navigation apparatus and methods are described. An apparatus includes a thickness sensor system and a processing system. The thickness sensor system produces a respective set of measurements of thickness of an object at six or more locations through a surface of the object during each of multiple thickness measurement cycles. The processing system produces motion measures indicative of movement in relation to the object from ones of the sets of thickness measurements. In accordance with a method, a respective set of measurements of thickness of an object is generated at six or more locations through a surface of the object during each of multiple thickness measurement cycles. Motion measures indicative of movement in relation to the object are generated from ones of the sets of thickness measurements.
    Type: Application
    Filed: September 11, 2006
    Publication date: March 13, 2008
    Inventors: George Panotopoulos, David W. Dolfi
  • Patent number: 5138480
    Abstract: A traveling wave optical modulator on X-cut lithium niobate is disclosed which has improved bandwidth capability along with a low switching voltage requirement and good impedance matching. In accordance with another aspect of the disclosed invention, the impedance of a traveling wave optical modulator may be increased to a desired input impedance without adversely affecting the drive voltage or velocity matching of the modulator. This is accomplished by reducing the width of the ground electrodes to not more than 3 times the width of the hot electrode.
    Type: Grant
    Filed: August 14, 1991
    Date of Patent: August 11, 1992
    Assignee: Hewlett-Packard Company
    Inventors: David W. Dolfi, Roger L. Jungerman
  • Patent number: 5119450
    Abstract: An optical circuit element for processing single mode light. The element is of the type that includes input and output waveguides that communicate with an intermediate waveguide network. The input and output waveguides are designed to support only the fundamental mode of light throughout a predetermined optical wavelength range while the waveguides of the intermediate waveguide network can support higher order modes. By maintaining adiabatic optical path transitions throughout the element, cross-coupling between the fundamental and higher order modes is avoided so that broad wavelength range single mode signal processing is achieved.
    Type: Grant
    Filed: August 20, 1991
    Date of Patent: June 2, 1992
    Assignee: Hewlett-Packard Company
    Inventors: Tirumala R. Ranganath, David W. Dolfi
  • Patent number: 4843350
    Abstract: A travelling wave modulator in which the phase velocity of a first wave is modulated by a second travelling wave. Means are provided to alter the polarity of the second wave in accordance with a pseudorandom code. Barker codes and Golay codes are particularly suitable for improving the bandwidth-to-voltage ratio of the modulator over a comparable conventional modulator.
    Type: Grant
    Filed: January 20, 1987
    Date of Patent: June 27, 1989
    Assignee: Hewlett-Packard Company
    Inventors: Moshe Nazarathy, David W. Dolfi, Roger L. Jungerman
  • Patent number: 4843586
    Abstract: A sampler that can be used to sample optical or electrical signals, having an improved sensitivity-resolution product compared to conventional samplers. A coded switched electrode modulator has electrodes that produce polarity reversals in an applied voltage signal in accordance with a pseudorandom code having small sidelobes. An optical signal is injected into an optical waveguide that is oriented parallel to the electrodes. When the optical signal is proportional to the coded electrode pattern, the device is used as an electrical sampler. When the applied voltage signal is proportional to the coded electrode pattern, the device is used as an optical sampler.
    Type: Grant
    Filed: April 28, 1987
    Date of Patent: June 27, 1989
    Assignee: Hewlett-Packard Company
    Inventors: Moshe Nazarathy, David W. Dolfi, Brian H. Kolner