Patents by Inventor Cathal J. Mahon

Cathal J. Mahon 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).

  • Device for heterodyne detection of an optical signal and for reducing noise in the signal using polarization control elements
    Patent number: 5124828
    Abstract: Device for optical heterodyne detection of an optical signal beam and an optical transmission system provided with such a device. An optical heterodyne detection device is described in which with the aid of three controllable elements (A, B and C), to influence the state of polarization and having a limited control range, such as Faraday rotators or birefringent electro-optical crystals, the state of polarization of radiation originating from a local oscillator (30) is made to correspond to the signal beam transmitted through a long-distance transmission fibre (10).
    Type: Grant
    Filed: August 6, 1991
    Date of Patent: June 23, 1992
    Assignee: U.S. Philips Corporation
    Inventor: Cathal J. Mahon
  • Polarization-maintaining single-mode optical fibre and method of making same
    Patent number: 5067793
    Abstract: An optical fibre of the single-mode type in which light travels in one polarization mode is formed from a single-mode quadruple-clad fibre, in which the dimension of the light-transmitting part of the fibre in a first direction perpendicular to the axis of the fibre differs from the dimension of the light-transmitting part in a second direction perpendicular to the axis of the fibre and the first direction.
    Type: Grant
    Filed: August 10, 1990
    Date of Patent: November 26, 1991
    Assignee: U.S. Philips Corporation
    Inventors: Peter K. Bachmann, Giok D. Khoe, Cathal J. Mahon, Hans-Jurgen Lydtin