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    3.
    发明专利
    未知

    公开(公告)号：NO158573B

    公开(公告)日：1988-10-05

    申请号：NO843655

    申请日：1984-09-14

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： ROBA GIACOMO

    IPC: C03B37/018 ,  G02B6/00

    Abstract: The process allows a uniform layer of glass particles, forming the preform, to be deposited on the internal wall of a supporting tube rotated around its axis. A suitable relationship is provided to determine the temperature distribution in the deposition zone. The apparatus makes use of different types of heat sources for generating inside the tube a temperature with the distribution required by the process.

    4.
    发明专利
    未知

    公开(公告)号：NO155862B

    公开(公告)日：1987-03-02

    申请号：NO834524

    申请日：1983-12-08

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： ROBA GIACOMO

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

    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.

    6.
    发明专利
    未知

    公开(公告)号：IT1129463B

    公开(公告)日：1986-06-04

    申请号：IT6894680

    申请日：1980-12-19

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： ROBA GIACOMO

    IPC: B05C3/12 ,  B05D1/18 ,  C03C25/10 ,  C03C25/12 ,  C03C25/18 ,  G02F

    Abstract: A nozzle used in the coating of optical fibers with a protective resin layer comprises an aluminum body split into two symmetrical halves with cavities which upon assembly form a frustoconical funnel terminating at its narrower lower end in a coaxially converging outlet port. The cavities are machined in solid aluminum blocks whereupon each block is anodized in sulfuric acid to form thereon an abrasion-resistant oxide layer with few, small pores which may be sealed by an aftertreatment in hot de-ionized water.

    7.
    发明专利
    未知

    公开(公告)号：NO153803C

    公开(公告)日：1986-05-28

    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 ,  C03B37/027

    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.

    PROCESS AND DEVICE FOR ONLINE DEHYDROGENATION OF FIBRE-DRAWING PREFORMS
    8.
    发明专利
    PROCESS AND DEVICE FOR ONLINE DEHYDROGENATION OF FIBRE-DRAWING PREFORMS 未知

    公开(公告)号：DE3262779D1

    公开(公告)日：1985-05-02

    申请号：DE3262779

    申请日：1982-06-21

    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

    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.

    9.
    发明专利
    未知

    公开(公告)号：AT12382T

    公开(公告)日：1985-04-15

    申请号：AT82105428

    申请日：1982-06-21

    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

    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.

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