Patents Assigned to Ceorl Limited
  • Optical fiber multiport apparatus for detecting phase shifts
    Patent number: 5581641
    Abstract: A coherent detector which is insensitive to signal or polarization state may be assembled using a fused optical fibre multiport constructed from five optical fibres. The fibres are fused in a circularly symmetric arrangement, then tapered until power injected into any input is equally distributed to all outputs. Reference signals are injected into adjacent inputs and the signal to be detected into a signal adjacent one of the reference inputs.
    Type: Grant
    Filed: May 2, 1995
    Date of Patent: December 3, 1996
    Assignee: Ceorl Limited
    Inventors: Adrian R. L. Travis, John E. Carroll