Patents by Inventor Wel-Hua Guo

Wel-Hua Guo 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 LASER DEVICE AND A METHOD FOR PRODUCING LIGHT OF RESPECTIVE SELECTABLE WAVELENGTHS
    Publication number: 20100046562
    Abstract: A tunable laser device (1) comprises integrally formed first and second ridge waveguides (5, 6). A longitudinally extending ridge (12) defines first and second light guiding regions (19, 20) of the first and second waveguides (5, 6) which communicate with each other. A plurality of first slots (27) extending laterally in the ridge (12) adjacent the first waveguide (5), and a plurality of second slots (28) extending laterally in the ridge (12) adjacent the second waveguide (6) produce first and second mirror loss spectra of the respective first and second waveguides (5, 6) with minimum peak values at respective first and second wavelength values.
    Type: Application
    Filed: September 20, 2007
    Publication date: February 25, 2010
    Applicants: THE PROVOST, FELLOWS AND SCHOLARS OF THE COLLEGE OF THE HOLY AND UNDIVIDED TRINITY OF QUEEN ELIZABE, UNIVERSITY COLLEGE PARK, NATIONAL UNIVERSITY OF IRELAND, CORK
    Inventors: John F. Donegan, Richard Phelan, Wel-Hua Guo, Qiao-Yin Lu, Brian Corbett, Paul Martin Lambkin, Brendan John Roycroft