Patents by Inventor Simon D. Perrin

Simon D. Perrin 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).

  • Method for making optical device with composite passive and tapered active waveguide regions
    Patent number: 5985685
    Abstract: A semiconductor optical device, for example a laser, has a composite optical waveguide including a tapered, MQW active waveguide in optical contact with a substantially planar, passive waveguide. The fundamental optical mode supported by the composite waveguide varies along the length of the composite waveguide so that, in a laser, the laser mode is enlarged and is a better match to single mode optical fibre. A method for making such semiconductor optical devices is also disclosed.
    Type: Grant
    Filed: September 29, 1998
    Date of Patent: November 16, 1999
    Assignee: British Telecommunications public limited company
    Inventors: Ian F. Lealman, Michael J. Robertson, Simon D. Perrin
  • Optical device with composite passive and tapered active waveguide regions
    Patent number: 5844929
    Abstract: A semiconductor optical device, for example a laser, has a composite optical waveguide including a tapered, MQW active waveguide in optical contact with a substantially planar, passive waveguide. The fundamental optical mode supported by the composite waveguide varies along the length of the composite waveguide so that, in a laser, the laser mode is enlarged and is a better match to single mode optical fiber. A method for making such semiconductor optical devices is also disclosed.
    Type: Grant
    Filed: August 23, 1996
    Date of Patent: December 1, 1998
    Assignee: British Telecommunications public limited company
    Inventors: Ian F. Lealman, Michael J. Robertson, Simon D. Perrin