Patents Assigned to SIP - Societa Italiana per L'Escercizio delle Telecomunicazioni p.a.
  • Method of fabricating strip monomode active optical waveguides by vitrifying an interior portion of a tube with a laser
    Patent number: 5279634
    Abstract: In order to fabricate strip monomode active optical waveguides for optical telecommunications, a layer of vitreous soot is deposited on the interior of a tubular substrate and is impregnated with a solution of a precursor of a rare-earth dopant, and a radiation with a wavelength comprised in an absorption band of the dopant is moved along the soot, along a trajectory corresponding to the geometrical shape desired for the guide, thereby forming a vitrified strip.
    Type: Grant
    Filed: October 9, 1992
    Date of Patent: January 18, 1994
    Assignees: SIP - Societa Italiana per L'Escercizio delle Telecomunicazioni p.a., SIRTI S.p.A.
    Inventors: Livio Cognolato, Angelantonio Gnazzo