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124 records (took 0.025 seconds)

    71.
    发明专利
    未知

    公开(公告)号：IT1179876B

    公开(公告)日：1987-09-16

    申请号：IT6825584

    申请日：1984-12-18

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： ROBA GIACOMO

    IPC: C03B37/014 ,  C03B8/02 ,  C03B19/12 ,  C03B37/016 ,  C03B37/027 ,  G02B6/00 ,  C03B

    Abstract: The apparatus allows the continuous production of optical fibres (15) starting from liquid-phase reactants. They are injected into a pressurized vertical vessel (3), comprising a second coaxial vessel (4), which can be vertically displaced for the variations of the refractive-index profile. The first vessel supplies material for the cladding, the second for the fibre core.Suitable furnaces (6,9,14) help the reaction and allow preform sintering and drawing.

    74.
    发明专利
    未知

    公开(公告)号：IT1168841B

    公开(公告)日：1987-05-20

    申请号：IT6795683

    申请日：1983-09-15

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： ROBA GIACOMO

    IPC: C03B37/018 ,  C03C13/04 ,  C07C13/04 ,  G02B6/00 ,  C03B

    Abstract: The process of manufacturing optical fibers of extremely low loss in the medium infrared permits the fabrication of glass preforms having as basic materials metal-fluorides obtained from vapor-phase reactants.

    75.
    发明专利
    未知

    公开(公告)号：IT1168839B

    公开(公告)日：1987-05-20

    申请号：IT6795483

    申请日：1983-09-15

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： ROBA GIACOMO

    IPC: C03B37/018 ,  G02B6/00 ,  C03B

    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.

    77.
    发明专利
    未知

    公开(公告)号：IT1145157B

    公开(公告)日：1986-11-05

    申请号：IT6785781

    申请日：1981-06-22

    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 ,  G02B

    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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