Patents by Inventor Tarek Abd Elazim Ramadan

Tarek Abd Elazim Ramadan 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).

  • Coupler-multiplexer permutation switch
    Publication number: 20040208447
    Abstract: A coupler-multiplexer permutation switch (CMPS) integrates multiplexng and switching functions on a single substrate. It has a single-mode/multi-mode backward coupler followed by a digital optical switch (DOS). In the CMPS, the single-mode waveguide channels are phase-matched through a grating with the corresponding, backward-propagating modes of a multi-mode waveguide. The different modes are subsequently separated in a digital optical switch. Different permutations are obtained by electronically controlling an effective-index distribution of DOS output waveguides.
    Type: Application
    Filed: April 20, 2001
    Publication date: October 21, 2004
    Applicant: COLUMBIA UNIVERSITY
    Inventor: Tarek Abd Elazim Ramadan