Patents by Inventor Susan P. Craig-Ryan

Susan P. Craig-Ryan 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).

  • Wave-guiding structure with lasing properties
    Patent number: 5412672
    Abstract: Optical wave-guides, e.g. fibres, for use as photonic amplifiers have a path region partly or, preferably, wholly composed as a silica/germania glass with 0.1 to 5000 ppm mole of Er.sup.3+ as a lasing additive and alumina to adjust the bandwidth, the Ge:Al mole ratio being more than 2.8, e.g. 1:0.001 to 0.25. It is surprising that low amounts of alumina have a useful and significant effect on the lasing bandwidth whereby frequency division multiplex is facilitated.
    Type: Grant
    Filed: December 10, 1993
    Date of Patent: May 2, 1995
    Assignee: British Telecommunications public limited company
    Inventors: Benjamin J. Ainslie, Susan P. Craig-Ryan
  • Wave-guiding structure with lasing properties
    Patent number: 5278850
    Abstract: Optical wave-guides, e.g. fibres, for use as photonic amplifiers have a path region partly or, preferably, wholly composed as a silica/germania glass with 0.1 to 5000 ppm mole of Er.sup.3+ as a lasing additive and alumina to adjust the bandwidth, the Ge:Al mole ratio being more than 2.8, e.g. 1:0.001 to 0.25. It is surprising that low amounts of alumina have a useful and significant effect on the lasing bandwidth whereby frequency division multiplex is facilitated.
    Type: Grant
    Filed: December 16, 1992
    Date of Patent: January 11, 1994
    Assignee: British Telecommunications
    Inventors: Benjamin J. Ainslie, Susan P. Craig-Ryan