Patents by Inventor Daniel A. Ratoff

Daniel A. Ratoff 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).

  • Upgradable, gain flattened fiber amplifiers for WDM applications
    Patent number: 6388806
    Abstract: A multistage optical fiber amplifier (OFA) system is designed to be upgraded with the addition of pump power when signal capacity of an optical communication link is correspondingly increased. The system includes a gain flattening filter (GFF) that remains valid when the system is upgraded because of the system design. Also disclosed are ways to enhance the GFF as well as control the channel signal gain tilt as well as adjust the external gain uniformity to be the same for an assembly line of OFA systems.
    Type: Grant
    Filed: February 28, 2001
    Date of Patent: May 14, 2002
    Assignee: SDL, Inc.
    Inventors: Paul N. Freeman, Stephen G. Grubb, Daniel A. Ratoff, David G. Mehuys
  • Upgradable, gain flattened fiber amplifiers for WDM applications
    Patent number: 6236498
    Abstract: A multistage optical fiber amplifier (OFA) system is designed to be upgraded with the addition of pump power when signal capacity of an optical communication link is correspondingly increased. The system includes a gain flattening filter (GFF) that remains valid when the system is upgraded because of the system design. Also disclosed are ways to enhance the GFF as well as control the channel signal gain tilt as well as adjust the external gain uniformity to be the same for an assembly line of OFA systems.
    Type: Grant
    Filed: February 19, 1999
    Date of Patent: May 22, 2001
    Assignee: SDL, Inc.
    Inventors: Paul N. Freeman, Stephen G. Grubb, Daniel A. Ratoff, David G. Mehuys