Patents by Inventor Moira J. Stewart

Moira J. Stewart 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 amplifiers
    Patent number: 5608571
    Abstract: An optical amplifier for a wavelength multiplexed transmission system has a set of optically amplifying fibres (26a, 26b) each provided with an associated spectrally selective Bragg reflector (27a, 27b). The amplifying fibres are optically coupled with a coupler (23) such that an optical signal having different spectral components launched into an input (21a) of the coupler is emitted from an output (21b) of the coupler after the different components have propagated through different ones of the amplifying fibres each after reflection in its associated reflector.
    Type: Grant
    Filed: October 5, 1995
    Date of Patent: March 4, 1997
    Assignee: Northern Telecom Limited
    Inventors: Richard E. Epworth, Andrew N. Robinson, Moira J. Stewart