Patents by Inventor Jugnu J. Ojha

Jugnu J. Ojha 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).

  • Semiconductor optical waveguide
    Patent number: 5917981
    Abstract: A channel waveguide structure which can be incorporated into VLSI (very large scale integration) integrated circuits uses a SiGe (silicon germanium) alloy core and Si (silicon) top and bottom cladding layers. The core may consist of only a SiGe alloy layer or it may be formed as a superlattice containing Si layers alternating with SiGe alloy layers. LOCOS (locally oxidized silicon) regions are formed on the top cladding layer at spaced locations thereby defining lateral boundaries of channels in the core.
    Type: Grant
    Filed: May 13, 1998
    Date of Patent: June 29, 1999
    Assignee: Northern Telecom Limited
    Inventors: Stephen J. Kovacic, Jugnu J. Ojha
  • Semiconductor optical waveguide
    Patent number: 5841930
    Abstract: A channel waveguide structure which can be incorporated into VLSI (very large scale integration) integrated circuits uses a SiGe (silicon germanium) alloy core and Si (silicon) top and bottom cladding layers. The core may consist of only a SiGe alloy layer or it may be formed as a superlattice containing Si layers alternating with SiGe alloy layers. LOCOS (locally oxidized silicon) regions are formed on the top cladding layer at spaced locations thereby defining lateral boundaries of channels in the core.
    Type: Grant
    Filed: July 24, 1997
    Date of Patent: November 24, 1998
    Assignee: Northern Telecom Limited
    Inventors: Stephen J. Kovacic, Jugnu J. Ojha
  • Method for low-loss insertion of an optical signal from an optical fibre to a waveguide integrated on to a semiconductor wafer
    Patent number: 5703980
    Abstract: A method and apparatus are provided for coupling light from a fiber to a waveguide on an OEIC (optoelectronic integrated circuit). The region of the fiber to be connected is made into a D-fiber by removing a portion of its cladding. The flat surface is fused to a silicon dioxide coated portion of the waveguide. The light in the fiber is evanescently coupled into the waveguide on the OEIC which is typically a planar or channel waveguide.
    Type: Grant
    Filed: September 20, 1996
    Date of Patent: December 30, 1997
    Assignee: Northern Telecom
    Inventors: Thomas MacElwee, Stephen J. Kovacic, Jugnu J. Ojha
  • Semiconductor optical waveguide
    Patent number: 5682455
    Abstract: A channel waveguide structure which can be incorporated into VLSI (very large scale integration) integrated circuits uses a SiGe (silicon germanium) alloy core and Si (silicon) top and bottom cladding layers. The core may consist of only a SiGe alloy layer or it may be formed as a superlattice containing Si layers alternating with SiGe alloy layers. LOCOS (locally oxidized silicon) regions are formed on the top cladding layer at spaced locations thereby defining lateral boundaries of channels in the core.
    Type: Grant
    Filed: February 29, 1996
    Date of Patent: October 28, 1997
    Assignee: Northern Telecom Limited
    Inventors: Stephen J. Kovacic, Jugnu J. Ojha