Patents by Inventor Dan Case

Dan Case 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: 6771132
    Abstract: A wide dynamic range transimpedance amplifier with a low cut off frequency at high optical power. An automatic transimpedance gain control and DC cancellation control feedback circuit includes variable impedance circuitry including a pnp transistor that is connected with the input signal. The impedance seen at the emitter of the pnp transistor changes according to the average value of the photodiode input current. The transconductance of the pnp transistor is not dependent on the average input current as the input current increases. The low cutoff frequency thus approaches an upper limit as the input current increases and does not increase exponentially.
    Type: Grant
    Filed: February 21, 2003
    Date of Patent: August 3, 2004
    Assignee: Finisar Corporation
    Inventors: Gilles P. Denoyer, Dan Case
  • Publication number: 20040136721
    Abstract: An optical transceiver module having a multiplexing analog control interface. The optical transceiver module comprises a controller and integrated post-amplifier/laser driver, which are included on a printed circuit board associated with the module. Transmitting and receiving optical sub-assemblies are also included in the module. A time division multiplexing analog control signal interface interconnects the controller with the integrated post-amplifier/laser driver. Digital control signals produced by the controller are converted and combined into a multiplexed analog control signal and transmitted via the interface to the integrated post-amplifier/laser driver. After receipt by the integrated post-amplifier/laser driver, the multiplexed analog control signal is divided into discrete analog control signals and forwarded to a plurality of control devices that use the control signals to modify a plurality of operating parameters of the transceiver module.
    Type: Application
    Filed: November 6, 2003
    Publication date: July 15, 2004
    Inventors: Giorgio Giaretta, Andreas Weber, Dan Case
  • Publication number: 20040131362
    Abstract: An optical transceiver module having digital control of laser current peaking is disclosed. The optical transceiver module comprises a controller and integrated post-amplifier/laser driver, which are included on a printed circuit board disposed in the module. Transmitting and receiving optical sub-assemblies are also disposed in the module. A digital signal interface interconnects the controller with the integrated post-amplifier/laser driver. Digital control signals produced by the controller are transmitted via the digital signal interface to the integrated post-amplifier/laser driver, where they are converted to analog control signals. The analog control signals are forwarded to control components responsible for governing the electrical current supplied to the laser of the transmitting optical sub-assembly. The laser current is intermittently peaked by the control signal in order to hasten the transition from light to no-light emission, thereby improving laser response and performance.
    Type: Application
    Filed: November 6, 2003
    Publication date: July 8, 2004
    Inventors: Giorgio Giaretta, Andreas Weber, Dan Case
  • Publication number: 20040091028
    Abstract: A transceiver module having integrated eye diagram opening functionality for reducing jitter is described. The transceiver module may include a transmitter eye opener and a receiver eye opener integrated in a single circuit. The transceiver module may also include serial control and various other integrated components. Other functionalities that may be integrated on the transceiver module include loopback modes, bypass features, bit error rate testing, and power down modes.
    Type: Application
    Filed: July 28, 2003
    Publication date: May 13, 2004
    Inventors: Lewis B. Aronson, Rudy Hofmeister, Christopher Madden, Mark Farley, Dan Case, Tom Lenosky
  • Publication number: 20040076119
    Abstract: A transceiver module having integrated eye diagram opening functionality for reducing jitter is described. The transceiver module may include a transmitter eye opener and a receiver eye opener integrated in single circuit. The transceiver module may also include serial control and various other integrated components. Other functionalities that may be integrated on the transceiver module include loopback modules, bypass features, bit error rate testing, and power down modes.
    Type: Application
    Filed: July 28, 2003
    Publication date: April 22, 2004
    Inventors: Lewis B. Aronson, Rudy Hofmeister, Christopher Madden, Mark Farley, Dan Case, Tom Lenosky
  • Publication number: 20040076113
    Abstract: A transceiver module having intergrated eye diagram opening functionality for reducing jitter is describe. The transceiver module may transmitter eye opener and a receiver eye opener integated in a single circuit. The transceiver module may also include serial control and various other integated components. Other functionalities that may be integrated on the transceiver module include loopback modes, bypass features, bit error rate testing, and power down mode.
    Type: Application
    Filed: July 28, 2003
    Publication date: April 22, 2004
    Inventors: Lewis B. Aronson, Rudy Hofmeister, Christopher Madden, Mark Farley, Dan Case, Tom Lenosky
  • Publication number: 20040022544
    Abstract: An integrated post-amplifier and laser driver assembly is provided that includes a digital control interface for communication with an external digital IC controller having an I2C bus configured to receive signal parameter programming input from a user. The PA/LD includes one or more DACs which communicate with the digital control interface by way of a glue logic module. A memory is provided in the PA/LD that communicates with the DACs by way of the glue logic module and stores an algorithm for facilitating implementation of changes to signal parameters of one or more signals by way of the DACs. Signal parameter programming instructions are received at the PA/LD from a user by way of the I2C bus, and/or from the internally coded algorithm, and are used by the DACs to facilitate implementation of changes to signal parameters of one or more signals.
    Type: Application
    Filed: July 29, 2003
    Publication date: February 5, 2004
    Inventors: Dan Case, Andreas Weber, Giorgio Giaretta