Patents by Inventor Paul K. Yu

Paul K. Yu 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).

  • Electroabsorption modulator having a barrier inside a quantum well
    Patent number: 7095542
    Abstract: An electroabsorption modulator (10) includes at least one quantum well (26) in a conduction band and a corresponding quantum well (26) in a valence band. A barrier made from InGaAlAs or InGaAsP is formed within each of the quantum wells in the conduction and valence bands.
    Type: Grant
    Filed: February 1, 2002
    Date of Patent: August 22, 2006
    Assignee: The Regents of the University of California
    Inventors: Paul K. Yu, Dong-Soo Shin
  • Electroabsorption modulator having a barrier inside a quantum well
    Publication number: 20040070810
    Abstract: An electroabsorption modulator (10) includes at least one quantum well (26) in a conduction band and a corresponding quantum well (26) in a valence band. A barrier made from InGaAlAs or InGaAsP is formed within each of the quantum wells in the conduction and valence bands.
    Type: Application
    Filed: July 30, 2003
    Publication date: April 15, 2004
    Inventors: Paul K. Yu, Dong-Soo Shin
  • Apparatuses and methods for generating optical signals
    Publication number: 20010053165
    Abstract: Disclosed apparatuses include a return-to-zero (RZ) optical pulse generator, a non-return-to zero (NRZ) modulator, and a return-to-zero (RZ) transmitter. The apparatuses incorporate an electro-absorption modulator (EAM) and a controller that controls DC and AC voltages supplied to the EAM to provide the capability to vary its duty cycle. The apparatuses can also incorporate a phase modulator (PM) supplied with DC and AC voltages governed by the controller, to introduce frequency chirp into optical signals generated by the apparatuses. Elements such as the EAM and PM can be formed as an integrated unit on a substrate.
    Type: Application
    Filed: March 9, 2001
    Publication date: December 20, 2001
    Inventors: Xiaolu Wang, Guifang Li, Patrick LiKamWa, Paul K. Yu