Patents by Inventor M. T. Fatehi

M. T. Fatehi 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).

  • Telemetry for optical fiber amplifier repeater
    Patent number: 5229876
    Abstract: In this invention telemetry information is transmitted in an optical fiber communication system by providing an amplifier pump with excess power beyond that necessary to pump the amplifier. The excess power is not used to pump the amplifier but is rather used to transmit the telemetry information. In a specific embodiment, an optical communication system including a doped optical fiber amplifier such as, for example, an erbium doped amplifier, is provided with an amplifier pump which operates at approximately 1.48 .mu.m. The amplifier pump is provided with excess power so as to transmit telemetry information. In a specific embodiment, the telemetry signal can be detected with a low cost photodetector at a subsequent station.
    Type: Grant
    Filed: March 26, 1990
    Date of Patent: July 20, 1993
    Assignee: AT&T Bell Laboratories
    Inventors: M. T. Fatehi, Nils A. Olsson