Patents by Inventor William J. Devlin

William J. Devlin 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 laser amplifiers
    Patent number: 5291328
    Abstract: A semiconductor laser amplifier includes both a waveguide layer and an active layer. In use, an optical wave in the active layer interacts with the waveguiding layer to reduce the polarisation sensitivity of the amplifier. A short, thick active layer is not required, typical dimensions being 250 or 500 .mu.m long, by 0.2 .mu.m high. The mesa is typically about 2 .mu.m wide, but may be wider.
    Type: Grant
    Filed: August 1, 1991
    Date of Patent: March 1, 1994
    Assignee: British Telecommunications
    Inventors: William J. Devlin, David M. Cooper, Paul C. Spurdens, Simon Cole, Ian F. Lealman, Joseph J. Isaac
  • Method of manufacturing semiconductor structures
    Patent number: 5242857
    Abstract: In a semiconductor buried heterostructure laser having a mesa (2, 3, 4) and confinement layers (5, 6, 7) on a substrate (12), at least the lowermost of the confinement layers (5, 6, 7) is substantially planar up to the mesa. This is achieved by MOVPE growth of InP against lateral surfaces of the mesa (2, 3, 4) which are defined by distinct crystallographic planes of the material of the mesa. In particular (111) B InP planes are used. The laser is particularly for use in the field of optical communications.
    Type: Grant
    Filed: January 22, 1992
    Date of Patent: September 7, 1993
    Assignee: British Telecommunications public limited company
    Inventors: David M. Cooper, Andrew W. Nelson, Simon Cole, Ian F. Lealman, William J. Devlin
  • Vortex mixer drive
    Patent number: 4895453
    Abstract: An automatic vortexing drive is described in which a rotatable coupling has a cuplike recess positioned off of and opening radially outward from the axis of rotation of the coupling. The coupling is positioned to intercept the lower and reaction vessels in the recess. Selective rotation of the coupling permits the vessels to pass the coupling or be engaged by the coupling and nutated.
    Type: Grant
    Filed: August 24, 1988
    Date of Patent: January 23, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: William J. Devlin, Carl F. Morin, Robert K. Wiedenmann
  • Opto-electronic devices
    Patent number: 4794607
    Abstract: An optical amplifier takes the form of a semiconductor laser with coatings on its two facets. The coating takes the form of an anti-reflective coating, e.g. an oxide of Y, Gd, Nd, or La, to reduce the reflectivity and a thin interlayer, e.g. Al.sub.2 O.sub.3, to enhance compatibility between the laser and the anti-reflective coating.
    Type: Grant
    Filed: June 2, 1986
    Date of Patent: December 27, 1988
    Assignee: British Telecommunications public limited company
    Inventor: William J. Devlin