Patents by Inventor Jonathan S. Harper

Jonathan S. Harper 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).

  • Endface assessment
    Patent number: 5042943
    Abstract: Apparatus for measuring the endface angle of a cleaved optical fibre (1) includes a light source (3) for injecting optical energy into that end (1a) of the optical fibre (1) opposite to that whose endface angle is to be measured. Means are provided for tapping optical energy passing along the optical fiber (1) in both directions. Photodetectors (5,6) measure the signal strength of the optical energy tapped from the optical fibre (1) in both directions. The ratio of these measured signal strengths is compared with a known relationship between endface angles and the ratio of said measured signals to provide a measure of the endface angle.
    Type: Grant
    Filed: May 17, 1990
    Date of Patent: August 27, 1991
    Assignee: British Telecommunications Public Limited Company
    Inventors: Stephen R. Mallinson, Stephen Hornung, Jonathan S. Harper