Patents by Inventor Riyaz R. Jamal

Riyaz R. Jamal 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).

  • Measurement of polarization dependent loss in an optical transmission system
    Patent number: 7305183
    Abstract: A method and system enables measurement of polarization dependent loss (PDL) in an optical communications system including a plurality of cascaded optical components. An optical signal having a predetermined initial polarization state is launched into the optical communications system. A polarization state of the signal is detected at a selected detection point downstream of the launch point. The PDE is evaluated using the predetermined initial polarization state and the detected polarization state.
    Type: Grant
    Filed: October 15, 2001
    Date of Patent: December 4, 2007
    Assignee: Nortel Networks Limited
    Inventors: Kim B. Roberts, Giuseppe G. Bordogna, Riyaz R. Jamal, Douglas D. McGhan, Maurice S. O'Sullivan
  • Circuit for receiving an AC coupled broadband signal
    Patent number: 6741140
    Abstract: A receiving circuit having a termination impedance and an equalization capacitor. The receiving circuit is connectable to a signal source having a source impedance through a DC (direct current) blocking capacitor. The value of the equalization capacitor is chosen such that voltage spikes otherwise caused by the blocking capacitor are eliminated. The receiving circuit is especially useful in distributed electronic amplifiers and electro-optic modulators.
    Type: Grant
    Filed: December 12, 2001
    Date of Patent: May 25, 2004
    Assignee: Nortel Networks Limited
    Inventors: Riyaz R. Jamal, Gilbert P. Brunette, Simon C. Tsang
  • Measurement of polarization dependent loss in an optical transmission system
    Publication number: 20030039005
    Abstract: A method and system enables measurement of polarization dependent loss (PDL) in an optical communications system including a plurality of cascaded optical components. An optical signal having a predetermined initial polarization state is launched into the optical communications system. A polarization state of the signal is detected at a selected detection point downstream of the launch point. The PDE is evaluated using the predetermined initial polarization state and the detected polarization state.
    Type: Application
    Filed: October 15, 2001
    Publication date: February 27, 2003
    Inventors: Kim B. Roberts, Giuseppe G. Bordogna, Riyaz R. Jamal, Douglas D. McGhan, Maurice S. O'Sullivan