Patents by Inventor Veluppillai Chandrakumar

Veluppillai Chandrakumar 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).

  • System for transmitting RZ pulses over an amplified optical line, in particular over long distances
    Patent number: 5828478
    Abstract: A system for transmitting a return to zero type optical pulse stream includes an optical line and arrangements for amplifying and reshaping pulses distributed along the length of the line. The mean chromatic dispersion of the fiber of the line is of the normal type and the reshaping arrangements include a modulator that is synchronized to the pulse stream that it receives and that applies amplitude modulation to reshape the pulses temporally and phase modulation that is decreasing at the start of a pulse and increasing at the end of a pulse to reshape the pulses spectrally. The reshaping arrangements further include a band-pass filter.
    Type: Grant
    Filed: August 28, 1996
    Date of Patent: October 27, 1998
    Assignee: France Telecom
    Inventors: Jean-Baptiste Thomine, Veluppillai Chandrakumar