Patents by Inventor Andrew P. Appleyard

Andrew P. Appleyard 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).

  • Double-core active-fiber optical amplifier having a wide-band signal wavelength
    Patent number: 5087108
    Abstract: The invention relates to an optical amplifier, in particular for optical fiber telecommunication lines (1), operating with a transmission signal in a predetermined wavelength range, which amplifier comprises a fluorescent active optical fiber (6) doped with erbium, having two cores (11 and 12, 101 and 102), one (11, 101) of which is connected to a fiber (4) in which a transmission signal to be amplified and a luminous pumping energy are multiplexed, and to an outgoing fiber adapted to transmit the amplified signal, whereas the second core (12, 102) is optically coupled to the first core and is capable of absorbing the spontaneous erbium emission which would constitute a noise source, allowing a signal to be amplified in a wavelength range substantially corresponding to the tolerance range of the commercially available signal laser emitters.
    Type: Grant
    Filed: July 13, 1990
    Date of Patent: February 11, 1992
    Assignee: Societa' Cavi Pirelli S.p.A.
    Inventors: Giorgio Grasso, Paul L. Scrivener, Andrew P. Appleyard