公开(公告)号：IT8567265D0

公开(公告)日：1985-03-18

申请号：IT6726585

申请日：1985-03-18

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： ROBA GIACOMO

IPC: G02B6/00 ,  C03B37/027 ,  C03B37/029 ,  C03B37/12 ,  C03C25/10 ,  C03C25/106 ,  C03C25/22 ,  C03C25/223 ,  C03B

Abstract: The method allows surface defect reduction in silica optical-fibres (2) by enriching the external layer by silica bonded carbon atoms within the silica network: SiC·SiO 2 . Carbon is obtained from chemical reaction directly during the drawing step. Volume defects are reduced by rapidly cooling the fibre structure heated up to vitrous transition temperature. The apparatus allows the method to be carried out during drawing step.

公开(公告)号：DK436084A

公开(公告)日：1985-03-16

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 ,  C03C ,  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.

公开(公告)号：CH647081A5

公开(公告)日：1984-12-28

申请号：CH214581

申请日：1981-03-30

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： ROBA GIACOMO

IPC: B05C3/12 ,  B05D1/18 ,  C03C25/10 ,  C03C25/12 ,  C03C25/18 ,  G02B1/10 ,  G02B5/14

公开(公告)号：CA1169617A

公开(公告)日：1984-06-26

申请号：CA391508

申请日：1981-12-04

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： ROBA GIACOMO

IPC: B05C3/12 ,  B05D1/18 ,  C03C25/10 ,  C03C25/12 ,  C03C25/18 ,  B29F3/10

Abstract: A nozzle for applying an initial coating of resin to newly drawn optical fibres is made of aluminum, the surface of at least a duct portion of the nozzle being anodized to provide a hard abrasion resistant surface. This avoids the necessity of forming the duct portion itself from hard materials which are difficult to machine.

公开(公告)号：NO834524L

公开(公告)日：1984-06-18

申请号：NO834524

申请日：1983-12-08

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： ROBA GIACOMO

IPC: C03B19/14 ,  C03B37/018 ,  C03B37/025 ,  G02B6/00 ,  C03B

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.

公开(公告)号：AU536495B2

公开(公告)日：1984-05-10

申请号：AU9133082

申请日：1982-12-08

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： MODONE EROS ,  ROBA GIACOMO

IPC: C03B37/02 ,  C03B37/023 ,  C03B37/025 ,  C03B37/027 ,  G02B6/00

公开(公告)号：DE3161949D1

公开(公告)日：1984-02-23

申请号：DE3161949

申请日：1981-06-11

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.

公开(公告)号：NO830755L

公开(公告)日：1983-09-06

申请号：NO830755

申请日：1983-03-04

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： ROBA GIACOMO

IPC: C03B37/018 ,  C03B37/025 ,  C03C17/02 ,  G02B6/00 ,  C03B

公开(公告)号：NO830755A

公开(公告)日：1983-09-06

申请号：NO830755

申请日：1983-03-04

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： ROBA GIACOMO

IPC: C03B37/018 ,  G02B6/00 ,  C03B

CPC classification number: C03B37/01861 ,  C03B37/01807 ,  C03B37/01846

公开(公告)号：NO824217L

公开(公告)日：1983-06-23

申请号：NO824217

申请日：1982-12-15

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： MODONE EROS ,  ROBA GIACOMO

IPC: C03B37/02 ,  C03B37/023 ,  C03B37/025 ,  C03B37/027 ,  G02B6/00 ,  C03B