Patents by Inventor Rajeev J. Ram

Rajeev J. Ram 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).

  • Bipolar cascade arrow laser
    Publication number: 20010043628
    Abstract: A bipolar cascade-ARROW laser includes a plurality of core regions, at least one spacer disposed between each the plurality of core regions with each of the at least one spacers provided from a material having an index of refraction which is higher than an index of refraction of a material from which the core regions are provided. The bipolar cascade-ARROW laser further includes an anti-reflector disposed against each of the outermost ones of the core regions and at least one quantum well disposed in each of the plurality of core regions.
    Type: Application
    Filed: March 1, 2001
    Publication date: November 22, 2001
    Inventors: Steven G. Patterson, Rajeev J. Ram
  • Method and apparatus for generating frequency modulated pulses
    Publication number: 20010036332
    Abstract: A method and apparatus are provided for generating short (e.g., picosecond) pulses using a 2 section 1553 nm DBR laser without gain switching nor external modulation. The center wavelength of the DBR section is modulated at 0.5 GHz to generate a constant amplitude frequency modulated optical wave Large group velocity dispersion is then applied with a chirped fiber Bragg grating to convert the FM signal to a pulse stream.
    Type: Application
    Filed: March 23, 2001
    Publication date: November 1, 2001
    Applicant: 3M Innovative Properties Company
    Inventors: James F. Brennan, Patrick C. Chou, Harry L.T. Lee, Rajeev J. Ram, Hermann A. Haus, Erich P. Ippen