公开(公告)号：DE3367379D1

公开(公告)日：1986-12-11

申请号：DE3367379

申请日：1983-12-15

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： ROBA GIACOMO

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

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：NO154630C

公开(公告)日：1986-11-19

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

公开(公告)号：NO854088L

公开(公告)日：1986-05-14

申请号：NO854088

申请日：1985-10-15

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： ROBA GIACOMO

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

公开(公告)号：DK523885A

公开(公告)日：1986-05-14

申请号：DK523885

申请日：1985-11-13

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： ROBA GIACOMO

IPC: C03B37/018 ,  C03C13/04 ,  G02B6/00 ,  C03C

公开(公告)号：AU550027B2

公开(公告)日：1986-02-27

申请号：AU2196283

申请日：1983-12-05

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： ROBA GIACOMO

IPC: C03B37/025 ,  C03B37/075 ,  C03C17/22 ,  C03C17/245

公开(公告)号：CA1198326A

公开(公告)日：1985-12-24

申请号：CA405570

申请日：1982-06-21

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： MODONE EROS ,  ROBA GIACOMO

IPC: C03B8/04 ,  C03B37/014 ,  C03B37/018 ,  C03B37/025 ,  C03C13/00 ,  C03C13/04 ,  G02B6/44

Abstract: According to this process of on-line dehydrogenation of fibre-drawing preforms, the hydrogen of hydroxyl groups undergoes an isotopic exchange with deuterium in the reaction chamber whilst doped silica is obtained by reagent synthesis. The deuterium is added by a flow regulator to oxygen used as a carrier for the reagents.

公开(公告)号：DK523885D0

公开(公告)日：1985-11-13

申请号：DK523885

申请日：1985-11-13

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： ROBA GIACOMO

IPC: C03B37/018 ,  C03C13/04 ,  G02B6/00 ,  C03C

公开(公告)号：DE3172088D1

公开(公告)日：1985-10-03

申请号：DE3172088

申请日：1981-12-17

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： ROBA GIACOMO

IPC: B05C3/12 ,  B05D1/18 ,  C03C25/10 ,  C03C25/12 ,  C03C25/18 ,  C03C25/02 ,  C03B37/08 ,  C25D11/08 ,  D01D4/02 ,  D01D11/06 ,  D06B3/04 ,  G02B6/16

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.

公开(公告)号：BR8404518A

公开(公告)日：1985-08-06

申请号：BR8404518

申请日：1984-09-11

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： ROBA GIACOMO

IPC: C03B37/018 ,  G02B6/00 ,  C03C25/00 ,  C03B37/075

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.

公开(公告)号：BR8404517A

公开(公告)日：1985-08-06

申请号：BR8404517

申请日：1984-09-11

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： ROBA GIACOMO

IPC: C03B37/018 ,  C03C13/04 ,  C07C13/04 ,  G02B6/00 ,  C03C25/00 ,  C03B37/075

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.