Patents by Inventor Roman Länge

Roman Länge 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).

  • Reducing transients in an optical amplifier
    Patent number: 8908264
    Abstract: A controller for reducing a transient variation of gain of an optical amplifier is disclosed. The controller includes a control circuit adapted to generate an electrical signal mimicking optical gain transient variation upon an abrupt change in input loading conditions. The electrical signal is applied to a variable optical attenuator disposed downstream of the active optical fiber of the optical amplifier. The control circuit can be realized in a variety of ways, but preferably it includes a logarithmic amplifier and a high-pass filter sequentially connected. The logarithmic amplifier is connected to an input tap/photodetector, and the high-pass filter is connected to the variable optical attenuator.
    Type: Grant
    Filed: August 29, 2011
    Date of Patent: December 9, 2014
    Assignee: JDS Uniphase Corporation
    Inventor: Roman Länge
  • REDUCING TRANSIENTS IN AN OPTICAL AMPLIFIER
    Publication number: 20120050845
    Abstract: A controller for reducing a transient variation of gain of an optical amplifier is disclosed. The controller includes a control circuit adapted to generate an electrical signal mimicking optical gain transient variation upon an abrupt change in input loading conditions. The electrical signal is applied to a variable optical attenuator disposed downstream of the active optical fiber of the optical amplifier. The control circuit can be realized in a variety of ways, but preferably it includes a logarithmic amplifier and a high-pass filter sequentially connected. The logarithmic amplifier is connected to an input tap/photodetector, and the high-pass filter is connected to the variable optical attenuator.
    Type: Application
    Filed: August 29, 2011
    Publication date: March 1, 2012
    Applicant: JDSU Deutschland GmbH
    Inventor: Roman Länge