Patents by Inventor Catherine M. Ragdale

Catherine M. Ragdale 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).

  • Amplifier/filter combination
    Patent number: 5257273
    Abstract: An amplifier/filter combination including a fibre amplifier (4) and a fibre reflection/transmission filter (5) coupled to said amplifer. The fibre amplifier amplifies an input signal (1) in response to pump light (2) received from a laser. Preferably the fibre filter (5) is a chirped Bragg fibre filter which is arranged to filter out the unabsorbed portion of the pump light from the output amplified signal and which reflects the unabsorbed portion (7) of the pump light back to the amplifier (4) for re-absorption therein. The amplified signal (6) is transmitted by the filter (5) to a receiver.
    Type: Grant
    Filed: February 28, 1992
    Date of Patent: October 26, 1993
    Assignee: GEC-Marconi Limited
    Inventors: Mark C. Farries, Douglas C. J. Reid, Catherine M. Ragdale