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    OPTICAL FIBRE PREFORM MANUFACTURE
    54.
    发明专利
    OPTICAL FIBRE PREFORM MANUFACTURE 未知

    公开(公告)号：AU550914B2

    公开(公告)日：1986-04-10

    申请号：AU3298084

    申请日：1984-09-12

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： ROBA GIACOMO

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

    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.

    55.
    发明专利
    未知

    公开(公告)号：IT1119362B

    公开(公告)日：1986-03-10

    申请号：IT6878979

    申请日：1979-09-10

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： ROBA GIACOMO ,  VERGNANO PAOLO

    IPC: C03B8/02 ,  C03B37/018 ,  C03B37/00 ,  C03B37/016 ,  G02B6/00 ,  G02B

    Abstract: The invention concerns a method of and an apparatus for the production of preforms to be drawn into optical fibres, used as light conductors in telecommunications. Main liquid reactants are sent with a liquid oxidant towards a cylindrical support to the attainment of a preform of the required size. Then by chemical and physical means residual water is eliminated and the preform is collapsed to form a cylindrical rod.

    56.
    发明专利
    未知

    公开(公告)号：IT8567338D0

    公开(公告)日：1985-04-10

    申请号：IT6733885

    申请日：1985-04-10

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： PARISI GIUSEPPE ,  ROBA GIACOMO

    IPC: G02B6/00 ,  C03B37/018 ,  C03C13/04 ,  G02B

    Abstract: The method allows the production of silica and dopant with reactions among gaseous chemical compounds. The optical fibres produced do not present dip and exhibit low attenuation. Carbon dioxide is used as an oxidizer and organometallic aluminum compounds are used to obtain the dopant; silica is obtained from organometallic silicon compounds or silicon tetrachloride.

    58.
    发明专利
    未知

    公开(公告)号：NO151194C

    公开(公告)日：1985-02-27

    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.

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