Patents by Inventor Zoaib Z. Rangwala

Zoaib Z. Rangwala 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).

  • Tunable gigihertz all-optical clock generator and method using same
    Patent number: 5708671
    Abstract: A fully integrated photonic IC for optical clock generation using no electronic current modulation. A first and second laser stripes are joined by a Kerr effect non-linear directional coupler, NLDC. The first stripe is pumped with a DC current for laser generation, and the second stripe has a reflector at an end facet for generation of mode selective optical feedback. The DC current generates relaxation oscillation in both stripes and the Kerr effect of the NLDC causes the electric fields in both stripe to interact constructively so as to shift the relaxation oscillation to undamped oscillation. The optical clock generator is tuned by varying the applied DC current.
    Type: Grant
    Filed: April 17, 1996
    Date of Patent: January 13, 1998
    Assignee: Semi-Custom Logic, Inc.
    Inventors: Sueh-Wen Siao, Zoaib Z. Rangwala