Patents by Inventor David Michael Spirit

David Michael Spirit 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).

  • Optical switch
    Patent number: 6215570
    Abstract: Optical signals used for telecommunications in time division multiplexed format are processed to remove channels for local demodulation and to replace the removed channels with locally modulated data. The received signals are subjected to a wavelength modulation so that signals in selected channels are given distinctive wavelengths. After wavelength modulation, the time division multiplexed signals are separated using wavelength sensitive splitters and the various channels are sent to their correct destinations. In one embodiment, one channel is selected and given a distinctive wavelength and all the non-selected channels retain their original wavelength. The channels with the original wavelength are provided to an output terminal for onward transmission whereas the selected channel is provided for local demodulation.
    Type: Grant
    Filed: November 16, 1999
    Date of Patent: April 10, 2001
    Assignee: British Telecommunications public limited company
    Inventors: Andrew David Ellis, David Michael Spirit, David Arthur Owen Davies
  • Optical switch
    Patent number: 6091524
    Abstract: Optical signals used for telecommunications in time division multiplexed format are processed to remove channels for local demodulation and to replace the removed channels with locally modulated data. The received signals are subjected to a wavelength modulation so that signals in selected channels are given distinctive wavelengths. After wavelength modulation, the time division multiplexed signals are separated using wavelength sensitive splitters and the various channels are sent to their correct destinations. In one embodiment, one channel is selected and given a distinctive wavelength and all the non-selected channels retain their original wavelength. The channels with the original wavelength are provided to an output terminal for onward transmission whereas the selected channel is provided for local demodulation.
    Type: Grant
    Filed: April 8, 1997
    Date of Patent: July 18, 2000
    Assignee: British Telecommunications public limited company
    Inventors: Andrew David Ellis, David Michael Spirit, David Arthur Owen Davies