Patents Assigned to Cselt - Centro Studi E E Laboratori Telecommunicazoni SpA
  • Method of and apparatus for the measurement of the refractive-index profile in monomode optical fibres
    Patent number: 4664516
    Abstract: The refractive-index value is obtained by radially scanning a near-field image of the fiber output face and by computing, for each image point, the ratio between a first intensity value, obtained in the presence of a mask, having a transmissivity proportional to the fourth power of the transversal beam coordinate and located in a far-field plane, and a second intensity value, obtained in the absence of such a mask. An automated measurement apparatus for implementing the method is also provided.
    Type: Grant
    Filed: September 20, 1985
    Date of Patent: May 12, 1987
    Assignee: Cselt - Centro Studi E E Laboratori Telecommunicazoni SpA
    Inventors: Gianni Coppa, Pietro Di Vita