Patents by Inventor Andrew T. Harker

Andrew T. Harker 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).

  • Multi-stage fibre amplifier
    Patent number: 5521753
    Abstract: A multi-stage fiber amplifier includes attenuators located between co-pumped and counter-pumped stages. The attenuators prevent transmission of pump energy between the stages and the transmission of signal energy from later to earlier stages. The attenuators substantially separate the various stages whereby unwanted interaction is substantially reduced.
    Type: Grant
    Filed: January 10, 1995
    Date of Patent: May 28, 1996
    Assignee: Hewlett-Packard Company
    Inventors: Michael Fake, Andrew T. Harker