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公开(公告)号:IT8567278D0
公开(公告)日:1985-03-22
申请号:IT6727885
申请日:1985-03-22
Applicant: CSELT CENTRO STUDI LAB TELECOM
Inventor: ROBA GIACOMO
IPC: C03B37/08 , C03B37/029 , H05B6/02 , H05B6/62 , C03B
Abstract: The method of surfacing the heater of a furnace for optical fibre drawing allows elimination of defects in the inner heater surface, which defects give rise to particle emission towards the preform. This is achieved by depositing a thin layer of a mixture of oxides compatible with the material composing the heater.
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公开(公告)号:NO843656L
公开(公告)日:1985-03-18
申请号:NO843656
申请日:1984-09-14
Applicant: CSELT CENTRO STUDI LAB TELECOM
Inventor: ROBA GIACOMO
IPC: C03B37/018 , C03C13/04 , C07C13/04 , G02B6/00 , C03C
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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公开(公告)号:NO843655A
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
CPC classification number: C03B37/01815
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公开(公告)号:DK428884A
公开(公告)日:1985-03-16
申请号:DK428884
申请日:1984-09-07
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.
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公开(公告)号:IT8468255D0
公开(公告)日:1984-12-18
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.
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公开(公告)号:BR8306623A
公开(公告)日:1984-07-31
申请号:BR8306623
申请日:1983-12-02
Applicant: CSELT CENTRO STUDI LAB TELECOM
Inventor: ROBA GIACOMO
IPC: C03B19/14 , C03B37/018 , C03B37/025 , G02B6/00 , G02B5/16
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.
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公开(公告)号:DK547582A
公开(公告)日:1983-06-23
申请号:DK547582
申请日:1982-12-09
Applicant: CSELT CENTRO STUDI LAB TELECOM
Inventor: MODONE EROS , ROBA GIACOMO
IPC: C03B37/02 , C03B37/023 , C03B37/025 , C03B37/027 , G02B6/00 , C03B , G02B
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公开(公告)号:NO821973A
公开(公告)日:1982-12-23
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 , C03C13/04 , G02B6/44 , C03B
CPC classification number: C03C3/06 , C03B37/01413 , C03B37/01807 , C03B2201/22 , C03B2207/81 , C03C13/047 , C03C2201/21 , C03C2201/22 , C03C2203/54 , G02B6/4492 , Y10S65/90
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公开(公告)号:IT7968789D0
公开(公告)日:1979-09-10
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.
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公开(公告)号:DK158577B
公开(公告)日:1990-06-11
申请号:DK436084
申请日:1984-09-12
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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