Patents by Inventor Steven A. Havstad

Steven A. Havstad 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).

  • Compensation for polarization-mode dispersion in multiple wavelength-division multiplexed channels without separate composition for each individual channel
    Patent number: 6603890
    Abstract: Techniques for compensating for PMD in multiple WDM channels by processing all WDM channels in the same manner without demultpliexing the channels. A feedback control is provided to decrease the worst-case power penalty and the channel fading probability by optimizing over the entire group of WDM channels.
    Type: Grant
    Filed: March 6, 2001
    Date of Patent: August 5, 2003
    Assignee: University of Southern California
    Inventors: Reza Khosravani, Steven A. Havstad, Yong-Won Song, Paniz Ebrahimi, Alan E. Willner
  • Optical compensation for dispersion-induced power fading in optical transmission of double-sideband signals
    Patent number: 6388785
    Abstract: Techniques and devices for compensating dispersion-induced power fading in a double-sideband optical signal based on a tunable optical dispersion element.
    Type: Grant
    Filed: February 8, 2001
    Date of Patent: May 14, 2002
    Assignee: University of Southern California
    Inventors: Steven A. Havstad, Asaf B. Sahin, Olaf H. Adamczyk, Yong Xie, Alan E. Willner
  • Dynamic fiber loop-mirror filter based on pump-induced saturable gain or saturable absorber gratings
    Patent number: 6389195
    Abstract: An all-fiber, optically-tunable, narrowband optical loop-mirror filter (10) that makes use of a loop-mirror (24). The optical filter (10) includes a coupler (12), including two input fiber ports (14, 16) and two output fiber ports (18, 20) that are connected together to form the loop-mirror (24). A saturable medium (22) is positioned in the loop-mirror (24), and can be either a saturable absorber medium or a saturable gain medium. A potentially broadband optical input signal to be filtered and a pump are applied to the input ports (14, 16) of the coupler (12). The counter propagating signals in the loop-mirror (24) generated by the input signal and the pump create two standing wave interference patterns in the saturable medium (22). Depending on whether the input signal and the pump are applied to the same input port (14, 16) or different input ports (14, 16) determines whether the two standing wave interference patterns are in phase with each other or &Xgr; radians out of phase with each other.
    Type: Grant
    Filed: September 8, 1999
    Date of Patent: May 14, 2002
    Assignee: TRW Inc.
    Inventors: Steven A. Havstad, Baruch Fischer
  • Compensation for polarization-mode dispersion in multiple wavelength-division multiplexed channels without separate composition for each individual channel
    Publication number: 20010055437
    Abstract: Techniques for compensating for PMD in multiple WDM channels by processing all WDM channels in the same manner without demultpliexing the channels. A feedback control is provided to decrease the worst-case power penalty and the channel fading probability by optimizing over the entire group of WDM channels.
    Type: Application
    Filed: March 6, 2001
    Publication date: December 27, 2001
    Inventors: Reza Khosravani, Steven A. Havstad, Yong-Won Song, Paniz Ebrahimi, Alan E. Willner
  • Optical compensation for dispersion-induced power fading in optical transmission of double-sideband signals
    Publication number: 20010035996
    Abstract: Techniques and devices for compensating dispersion-induced power fading in a double-sideband optical signal based on a tunable optical dispersion element.
    Type: Application
    Filed: February 8, 2001
    Publication date: November 1, 2001
    Inventors: Steven A. Havstad, Asaf B. Sahin, Olaf H. Adamczyk, Yong Xie, Alan E. Willner