Patents by Inventor John Wolczanski

John Wolczanski 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).

  • Sample timing control in an optical receiver
    Patent number: 7894728
    Abstract: A method of compensating phase error between parallel digital signals of a received optical signal, in a coherent optical receiver. A phase differential between the digital signals is determined. A digital skew is imposed between the digital signals, an amount of skew imposed being an integer number of sample periods calculated to most nearly compensate the phase differential. The skewed digital signals are then digitally processed, in the frequency domain, to compensate a residual portion of the phase differential.
    Type: Grant
    Filed: October 17, 2006
    Date of Patent: February 22, 2011
    Assignee: Ciena Corporation
    Inventors: Han Sun, Chandra Bontu, Kim B. Roberts, John Sitch, John Wolczanski
  • Logic tracking interface circuit
    Patent number: 5077496
    Abstract: A logic tracking interface circuit includes a signal comparator, a feedback comparator and a logic gate of the type to be driven by the interface circuit. The mean of the inverting and noninverting outputs of the signal comparator is applied as an input to the feedback comparator, the other input being provided by the logic gate. The inverted output of the feedback comparator is used to control the common mode of the signal comparator.
    Type: Grant
    Filed: May 11, 1990
    Date of Patent: December 31, 1991
    Assignee: Northern Telecom Limited
    Inventor: John A. Wolczanski