Patents by Inventor Nan M. Froberg

Nan M. Froberg 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).

  • Method and apparatus for generating data encoded pulses in return-to-zero format
    Patent number: 5625722
    Abstract: A method and apparatus for converting a non-return-to-zero (NRZ) voltage data stream into an optical data stream in return-to-zero (RZ) format, is disclosed comprising supplying a continuous optical signal to a modulator, driving the modulator with an NRZ voltage data stream and encoding either the NRZ data stream or the electrical output of the receiver. The modulator can be an interferometer, such as a Mach-Zehnder interferometer, or a directional coupler, for example.
    Type: Grant
    Filed: December 21, 1994
    Date of Patent: April 29, 1997
    Assignee: Lucent Technologies Inc.
    Inventors: Nan M. Froberg, Alan H. Gnauck, Gregory Raybon, John J. Veselka
  • Data encoded optical pulse generator
    Patent number: 5521738
    Abstract: The apparatus and method according to the present invention includes a semiconductor laser-modulator which is used to simultaneously generate optical pulses and encode data. The optical data output from the laser-modulator are soliton pulses in RZ format suitable for transmission in long distance optical communications.
    Type: Grant
    Filed: June 30, 1994
    Date of Patent: May 28, 1996
    Assignee: AT&T Corp.
    Inventors: Nan M. Froberg, Alan Gnauck, Per B. Hansen, George T. Harvey, Gregory Raybon