Patents by Inventor James G. Roberts

James G. Roberts 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).

  • Apparatus for measuring optical power in an optical receiver with a non-linear element and a transconductance amplifier
    Patent number: 5286969
    Abstract: An optical power monitoring circuit in an optical data receiver. A transconductance amplifier with non-linear feedback converts averaged photodiode current into a voltage representing a logarithm of the received optical power, which may be converted into decibels referenced to a standard power (dBm). The circuit has wide dynamic range and uses matched devices to provide processing and temperature compensation.
    Type: Grant
    Filed: January 28, 1993
    Date of Patent: February 15, 1994
    Assignee: AT&T Bell Laboratories
    Inventor: James G. Roberts