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    METHOD OF AND DEVICE FOR FABRICATING OPTICAL FIBRE PREFORMS
    81.
    发明专利
    METHOD OF AND DEVICE FOR FABRICATING OPTICAL FIBRE PREFORMS 未知

    公开(公告)号：CA1203679A

    公开(公告)日：1986-04-29

    申请号：CA422959

    申请日：1983-03-04

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： ROBA GIACOMO

    IPC: C03B37/018 ,  C03B37/025 ,  C03C17/02 ,  G02B6/00 ,  G03B37/00

    Abstract: The diameter of a supporting tube of an optical fibre preform is kept constant, notwithstanding the tendency of the tube to collapse as a result of the high temperature necessary to react reagents and deposit raw material. The diameter is controlled by generating between the internal and the external tube surfaces a pressure difference variable in inverse proportion to the diameter of the tube itself and to the total gas flow at an input end of the tube. Means are provided to generate the pressure difference by setting up a pressure drop at the output end of the tube in a device which effects the separation of solid raw material particles from residual gases.

    82.
    发明专利
    未知

    公开(公告)号：NO843655L

    公开(公告)日：1985-03-18

    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.

    83.
    发明专利
    未知

    公开(公告)号：NO151194B

    公开(公告)日：1984-11-19

    申请号：NO811998

    申请日：1981-06-12

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： MODONE EROS ,  ROBA GIACOMO

    IPC: C03B37/00 ,  C03B37/018 ,  C03B37/025 ,  C03C13/00 ,  C03C13/04 ,  C03C21/00 ,  G02B6/00

    Abstract: Process for reducing hydroxyl-group content in preforms for optical fibres, manufactured by MCVD process, consisting of isotopic exchange between hydrogen and deuterium near the internal walls of the silica-glass supporting tube (8). The operation is carried out in two steps, first by inducing deuterium adsorption and then by termally activating the exchange reaction.

    NOZZLE
    88.
    发明专利
    NOZZLE 未知

    公开(公告)号：AU529609B2

    公开(公告)日：1983-06-16

    申请号：AU7831581

    申请日：1981-12-07

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： ROBA GIACOMO

    IPC: B05C3/12 ,  B05D1/18 ,  C03C25/10 ,  C03C25/12 ,  C03C25/18 ,  C03B37/025 ,  C03C25/02 ,  C25D11/08

    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.

    METHOD OF AND APPARATUS FOR PRODUCING OPTICAL FIBRE PREFORMS
    89.
    发明专利
    METHOD OF AND APPARATUS FOR PRODUCING OPTICAL FIBRE PREFORMS 未知

    公开(公告)号：CA1147216A

    公开(公告)日：1983-05-31

    申请号：CA359121

    申请日：1980-08-27

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： ROBA GIACOMO ,  VERGNANO PAOLO

    IPC: C03B37/018 ,  C03B8/02 ,  C03B37/00 ,  C03B37/016 ,  G02B6/00 ,  C03B37/025 ,  C03C17/00 ,  G02B5/172

    Abstract: Preforms for the formation of optical fibres having a controlled radial refractive index profile are produced by the cold deposition onto a cylindrical support of the solid reaction products of fluids selected and proportioned to be vitrifiable to a glass whose refractive index varies according to proportioning of the fluids, the deposited preform then being treated to remove its water content and vitrified. The deposition is achieved by directing the fluids through nozzles in a controlled atmosphere chamber towards either an inner or an outer surface of the cylindrical surface, the nozzles and the cylindrical surface being relatively translated and rotated during deposition to form successive layers of reaction products on the cylindrical surface.

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