Patents by Inventor Charles Norman Ironside

Charles Norman Ironside 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).

  • Publication number: 20040247218
    Abstract: There is disclosed an optoelectronic device, particularly an optoelectronic modulator (5a) including a resonant tunnelling diode (RTD) (15a) and operating by the electro-optic effect. The optoelectronic modulator device (5a) comprises a waveguide means (10a) including at least one resonant tunnelling diode (RTD) (15a), and wherein a change in absorption coefficient of a semiconductor material of the device with applied electric field is negligible at a wavelength of operation. In this way the device (5a) operates substantially solely by the electro-optic effect providing a change in refractive index of the waveguide (10a). The device (5a) may therefore act as a phase modulator. The device (15a) is conveniently termed a Resonant Tunnelling Diode Electro-optic Modulator (RTD-EOM).
    Type: Application
    Filed: April 7, 2004
    Publication date: December 9, 2004
    Inventors: Charles Norman Ironside, Jose Maria Longras Figueiredo