中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

124 records (took 0.022 seconds)

    121.
    发明专利
    未知

    公开(公告)号：NO821973L

    公开(公告)日：1982-12-23

    申请号：NO821973

    申请日：1982-06-14

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： MODONE EROS ,  ROBA GIACOMO

    IPC: C03B8/04 ,  C03B37/014 ,  C03B37/018 ,  C03B37/025 ,  C03C13/00 ,  C03C13/04 ,  G02B6/44 ,  C03B

    Abstract: Vapor deposition of doped silica in a reaction chamber on a rotating supporting surface, in the manufacture of a preform for the drawing of an optical fiber, is accompanied by the continuous admixture of deuterium with a flow of carrier gas, specifically oxygen, by which the reactants are transported to the reaction chamber. An isotopic substitution of deuterium for the hydrogen of hydroxyl groups in the reaction products shifts the major absorption peaks to wavelengths outside the minimum-attenuation range of 0.7 to 1.6 mu used for fiber-optical signaling. The proper ratio of deuterium to carrier gas is maintained with the aid of a mixer having two compartments separated by a perforated diaphragm or a thin metallic foil, one compartment being connected to a deuterium tank while the other communicates with a conduit through which the vapors entrained by the carrier gas pass to the reaction chamber.

    122.
    发明专利
    未知

    公开(公告)号：IT8268476D0

    公开(公告)日：1982-12-16

    申请号：IT6847682

    申请日：1982-12-16

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： ROBA GIACOMO

    IPC: C03B19/14 ,  C03B37/018 ,  C03B37/025 ,  G02B6/00 ,  C03C

    Abstract: Process for eliminating the axial refractive-index depression in optical fibres, obtained by the MCVD process, consisting in generating a pressure of dopant when in vapour state, equal to the vapour pressure of the dopant itself, inside the preform, during the collapsing state.

Patent Agency Ranking