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    PRODUCTION OF OPTICAL FIBRES BY VAPOUR REACTION OF AN ORGANO-METALLIC COMPOUND AND HALOGEN
    93.
    发明专利
    PRODUCTION OF OPTICAL FIBRES BY VAPOUR REACTION OF AN ORGANO-METALLIC COMPOUND AND HALOGEN 未知

    公开(公告)号：CA1277952C

    公开(公告)日：1990-12-18

    申请号：CA505633

    申请日：1986-04-02

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： PARISI GIUSEPPE ,  ROBA GIACOMO

    IPC: G02B6/00 ,  C03B37/014 ,  C03B37/018 ,  C03B37/027 ,  C03B37/025

    Abstract: Optical fibres for transmission in the medium infrared are manufactured using metal fluorides or chlorides obtained by vapour-phase reaction initiated at ambient temperature by ultraviolet radiation between an organo-metallic compound and a fluorine or chlorine containing gaseous reactant. The reaction products are subjected to thermal treatments in successive zones so as first to induce thermophoretic deposition in an axial direction onto an end of a preform and to expel vapour-phase reaction products, following which the deposited material is raised to melting point, cooled to vitrify it, the preform is annealed, and its opposite end is heated and drawn into a fibre. Core and cladding material may be formed and deposited in separate coaxial zones.

    APPARATUS FOR THE CONTINUOUS PRODUCTION OF OPTICAL FIBRES
    95.
    发明专利
    APPARATUS FOR THE CONTINUOUS PRODUCTION OF OPTICAL FIBRES 未知

    公开(公告)号：CA1250145A

    公开(公告)日：1989-02-21

    申请号：CA497615

    申请日：1985-12-13

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： ROBA GIACOMO

    IPC: C03B37/014 ,  C03B8/02 ,  C03B19/12 ,  C03B37/016 ,  C03B37/027 ,  G02B6/00 ,  C03B37/023

    Abstract: An apparatus for the continuous production of optical fibres from liquid phase reactants has two concentric inverted frustoconical vertical vessels into which the reactants for the core and the cladding are poured separately and forced downward by gas pressure through a first furnace which sets up a temperature gradient causing the reactants to form a porous solid preform. The inner vessel containing the core material terminates within the first furnace, but the outer vessel continues downwards through a second furnace in which the preform is vitrified after being dried by gas entering through a porous zone of the outer vessel and extracted with vapour phase reaction products through suction orifices above the porous zone. The downwardly emerging preform is heated and drawn into a fibre.

    96.
    发明专利
    未知

    公开(公告)号：IT1184068B

    公开(公告)日：1987-10-22

    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.

    98.
    发明专利
    未知

    公开(公告)号：AT27950T

    公开(公告)日：1987-07-15

    申请号：AT84111019

    申请日：1984-09-14

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： ROBA GIACOMO

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

    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.

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