Patents by Inventor Thomas John Cullen

Thomas John Cullen 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 notch filter manufacture in optical fibre waveguide by plastic deformation
    Patent number: 5708740
    Abstract: An optical notch filter is created in a bared length of single mode fibre by using a microburner and longitudinal stretching of the fibre to form a set of equispaced sharply localized non-adiabatic biconical tapers at a pitch corresponding to the beat length between the core-guided HE.sub.11 mode and the cladding-guided HE.sub.12 mode, the latter being stripped downstream of the tapers by a plastics protective coating surrounding the fibre.
    Type: Grant
    Filed: April 4, 1996
    Date of Patent: January 13, 1998
    Assignee: Northern Telecom Limited
    Inventor: Thomas John Cullen
  • Wavelength resonant fused fibre coupler
    Patent number: 5703976
    Abstract: A wavelength selective 2.times.2 single mode fibre coupler has a weakly coupled coupling region n which the cladding modes of the two fibres are coupled while the core modes remain uncoupled. A matched pair of core/cladding mode converters are located, one on one fibre on one side of the coupling region, and the other on the other fibre on the other side.
    Type: Grant
    Filed: November 14, 1995
    Date of Patent: December 30, 1997
    Assignee: Northern Telecom Limited
    Inventor: Thomas John Cullen