Patents by Inventor George Horace Brooke Thompson

George Horace Brooke Thompson 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).

  • Optical multiplexer/demultiplexer
    Patent number: 6243514
    Abstract: An optical multiplexer/demultiplexer with an improved spectral characteristic is provided by two diffraction gratings (21, 20) arranged optically in tandem and one being configured to embrace the other, the gratings also being arranged to provide free spectral ranges differing by a factor of at least two, and having a coupling (22′) between them that carries over into the second grating information concerning the dispersion afforded by the first grating.
    Type: Grant
    Filed: April 30, 1998
    Date of Patent: June 5, 2001
    Assignee: Nortel Networks Limited
    Inventor: George Horace Brooke Thompson
  • Optical multiplexter/demultiplexer
    Patent number: 6144783
    Abstract: An optical multiplexer/demultiplexer with an improved spectral characteristic is provided by two diffraction gratings (61, 60) arranged optically in tandem, the gratings being arranged to provide free spectral ranges differing by a factor of at least two, and having a coupling between them that carries over into the second grating information concerning the dispersion afforded by the first grating.
    Type: Grant
    Filed: November 16, 1998
    Date of Patent: November 7, 2000
    Assignee: Nortel Networks Corporation
    Inventors: Richard Edward Epworth, Terry Bricheno, George Horace Brooke Thompson
  • Optical multiplexer/demultiplexer
    Patent number: 6111996
    Abstract: An monolithic version of optical multiplexer/demultiplexer with an improved spectral characteristic is provided by two diffraction gratings arranged optically in tandem and with a field stop in the coupling between them, the gratings also being arranged to provide free spectral ranges differing by a factor of at least two, and having a coupling between them that carries over into the second grating information concerning the dispersion afforded by the first grating. The field stop is constituted by a pair of etched troughs arranged in the pattern of an open chevron.
    Type: Grant
    Filed: March 13, 1998
    Date of Patent: August 29, 2000
    Assignee: Northern Telecom Limited
    Inventor: George Horace Brooke Thompson
  • Semiconductor lasers
    Patent number: 6058125
    Abstract: A `big spot` semiconductor laser has a passive modal spot size transformer (2) formed integrally in tandem with the active region (1) of the laser. The passive transformer has a layer structure (5, 6) that supports a restricted set of modes and is designed such that, at the laser frequency, its length provides a phase slippage of .pi. between modes of adjacent order.
    Type: Grant
    Filed: June 19, 1998
    Date of Patent: May 2, 2000
    Assignee: Nortel Networks Corporation
    Inventor: George Horace Brooke Thompson
  • Optical waveguide couplers
    Patent number: 4082419
    Abstract: An optical directional coupler provides good guidance in the lateral direction by the use of projecting rib optical waveguide structure. One embodiment enables the use of sharper curves in the integrated optical circuitry with reduced optical loss.
    Type: Grant
    Filed: February 23, 1976
    Date of Patent: April 4, 1978
    Assignee: International Standard Electric Corporation
    Inventors: George Horace Brooke Thompson, David Francis Lovelace
  • Optical multiplexer/demultiplexer
    Patent number: RE38620
    Abstract: A monolithic version of optical multiplexer/demultiplexer with an improved spectral characteristics is provided by two diffraction gratings arranged optically in tandem and with a field stop in the coupling between them, the gratings also being arranged to provide free spectral ranges differing by a factor of at least two, and having a coupling between them that carries over into the second grating information concerning the dispersion afforded by the first grating. The field stop is constituted by a pair of etched troughs arranged in the pattern of an open chevron.
    Type: Grant
    Filed: December 11, 2001
    Date of Patent: October 12, 2004
    Assignee: Nortel Networks Limited
    Inventor: George Horace Brooke Thompson