Patents by Inventor Milind R. Gokhale

Milind R. Gokhale 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).

  • Patent number: 7333689
    Abstract: An asymmetric twin waveguide (ATG) structure with quantum-well intermixing in the taper region of the active waveguide is disclosed. The structure comprises a first waveguide, a second waveguide, and a taper formed in the second waveguide. The taper has an intermixed area formed therein comprising a plurality of quantum wells intermixed with a plurality of barriers. The quantum wells and barriers may be intermixed using plasma-enhanced intermixing such as, for example, Argon plasma enhanced intermixing. Quantum-well intermixing reduces absorption loss normally encountered in the movement of light between waveguides.
    Type: Grant
    Filed: September 30, 2005
    Date of Patent: February 19, 2008
    Assignee: The Trustees of Princeton University
    Inventors: Vinod M. Menon, Milind R. Gokhale, Stephen R. Forrest, Yu Huang, Fengnian Xia
  • Patent number: 6795622
    Abstract: A photonic integrated circuit comprises a first waveguide with a first mode of light propagating therein and a second waveguide with a second mode of light propagating therein. The first and second modes of light have different effective indices of refraction. A taper formed in the second waveguide facilitates communication of light between waveguides. Each of the first and second waveguides operate to perform at least one of the generating light, detecting light, and transporting light.
    Type: Grant
    Filed: June 4, 2002
    Date of Patent: September 21, 2004
    Assignee: The Trustess of Princeton University
    Inventors: Stephen R. Forrest, Milind R. Gokhale, Fengnian Xia, Vinod Menon
  • Publication number: 20030007719
    Abstract: A photonic integrated circuit comprises a first waveguide with a first mode of light propagating therein and a second waveguide with a second mode of light propagating therein. The first and second modes of light have different effective indices of refraction. A taper formed in the second waveguide facilitates communication of light between waveguides. Each of the first and second waveguides operate to perform at least one of the generating light, detecting light, and transporting light.
    Type: Application
    Filed: June 4, 2002
    Publication date: January 9, 2003
    Inventors: Stephen R. Forrest, Milind R. Gokhale, Fengnian Xia, Vinod Menon
  • Patent number: 6483863
    Abstract: A modulated laser device comprising two or more vertically stacked asymmetric waveguides is provided. The laser device comprises a first waveguide having a gain region formed therein for amplifying at least a first mode of light, and a second waveguide vertically coupled to the first waveguide and having a modulator formed therein for modulating a second mode of light having an effective index of refraction different from the first mode. Light propagating in the first waveguide is transferred into the second waveguide via a lateral taper in the first waveguide. The laser device may further comprise a third waveguide positioned between the first and second waveguide for providing isolation between the gain region and modulator. Distributed bragg reflector (DBR) and distributed feedback (DFB) laser designs may be employed in the device.
    Type: Grant
    Filed: June 26, 2001
    Date of Patent: November 19, 2002
    Assignee: The Trustees of Princeton University
    Inventors: Stephen R. Forrest, Milind R. Gokhale, Pavel V. Studenkov
  • Publication number: 20020097941
    Abstract: A modulated laser device comprising two or more vertically stacked asymmetric waveguides is provided. The laser device comprises a first waveguide having a gain region formed therein for amplifying at least a first mode of light, and a second waveguide vertically coupled to the first waveguide and having a modulator formed therein for modulating a second mode of light having an effective index of refraction different from the first mode. Light propagating in the first waveguide is transferred into the second waveguide via a lateral taper in the first waveguide. The laser device may further comprise a third waveguide positioned between the first and second waveguide for providing isolation between the gain region and modulator. Distributed bragg reflector (DBR) and distributed feedback (DFB) laser designs may be employed in the device.
    Type: Application
    Filed: June 26, 2001
    Publication date: July 25, 2002
    Inventors: Stephen R. Forrest, Milind R. Gokhale, Pavel V. Studenkov
  • Patent number: 6362069
    Abstract: The present invention provides a method of manufacturing VCSELs which involves a flip-bonding process wherein the top surface of the VCSEL wafer is bonded face down onto a surrogate substrate. The process begins in a manner similar to traditional double dielectric stack based VCSEL, but then involves flip-bonding the wafer onto an In or Ag epoxy coated surrogate substrate. The InP substrate is then selectively etched. After flip-bonding the wafer fabrication proceeds on the freshly etched surface which now forms the top surface. Next, standard mesa-isolation and contact formation techniques are performed on this newly etched surface.
    Type: Grant
    Filed: December 28, 2000
    Date of Patent: March 26, 2002
    Assignee: The Trustees of Princeton University
    Inventors: Stephen Forrest, Milind R. Gokhale, Hongsheng Wang
  • Patent number: 6330378
    Abstract: A photonic integrated circuit (PIC) device comprising two or more vertically stacked asymmetric waveguides is provided. A photo-detector PIC device comprises a coupling waveguide for providing low-coupling loss with an external optical fiber and for guiding primarily a first mode of light, a second waveguide vertically coupled to the first waveguide for guiding primarily a second mode of light having an effective index of refraction different from the first mode, and a photo-detector vertically coupled to the second waveguide. Light received at the coupling waveguide is moved into the second waveguide via a lateral taper in the second waveguide. The photo-detector PIC device may further comprise a third waveguide having an optical amplifier therein and positioned between the coupling waveguide and the second waveguide.
    Type: Grant
    Filed: November 21, 2000
    Date of Patent: December 11, 2001
    Assignee: The Trustees of Princeton University
    Inventors: Stephen R. Forrest, Milind R. Gokhale, Pavel V. Studenkov