公开(公告)号：IT1130481B

公开(公告)日：1986-06-11

申请号：IT6793480

申请日：1980-06-16

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 ,  C01B

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：NO151194B

公开(公告)日：1984-11-19

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.

公开(公告)号：CA1158047A

公开(公告)日：1983-12-06

申请号：CA379750

申请日：1981-06-15

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： ROBA GIACOMO ,  MODONE EROS

IPC: C03B37/00 ,  C03B37/018 ,  C03B37/025 ,  C03C13/00 ,  C03C13/04 ,  C03C21/00 ,  G02B6/00 ,  C03C17/00 ,  G02B5/14

Abstract: The hydroxyl group content of preforms manufactured by the MCVD process for use in manufacturing optical fibres is reduced by conducting isotopic exchange between hydrogen and deuterium near the internal walls of the silica glass supporting tube. The operation is carried out in two steps, first by inducing deuterium adsorption and then by thermally activating the exchange reaction. The fibres obtained from the preforms have improved light-transmitting properties as they are not subject to attenuation due to absorption corresponding to the second and third overtones of the vibration of the -OH bond.

公开(公告)号：NO811998A

公开(公告)日：1981-12-17

申请号：NO811998

申请日：1981-06-12

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： MODONE EROS ,  ROBA GUACOMO

IPC: C03B37/00 ,  C03B37/018 ,  C03C13/04 ,  C03C21/00 ,  G02B6/00 ,  C03B

CPC classification number: C03C13/047 ,  C03B37/01853 ,  C03B2201/22 ,  Y10S65/90

公开(公告)号：IT8067934D0

公开(公告)日：1980-06-16

申请号：IT6793480

申请日：1980-06-16

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 ,  C01B

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：DK163295C

公开(公告)日：1992-07-06

申请号：DK299684

申请日：1984-06-19

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： MODONE EROS

IPC: C03B37/018 ,  C01B17/20 ,  C03B8/00 ,  C03B8/04 ,  C03B19/14 ,  C03C3/32 ,  C03C4/10 ,  C03C13/04 ,  G02B1/00 ,  G02B6/00 ,  C01B19/04

Abstract: In order to obtain substances that are optically transparent in the infrared range, usable in the manufacture of optical fibers or radiation emitters, a metal or metalloid chalcogenide other than an oxide is produced by a double-substitution reaction between a starting chalcogen compound-particularly a hydride such as H2S, H2Se or H2Te-and a salt of the desired metal or metalloid, e.g. a chloride. The starting compound and the reactant salt preferably are vaporized at a temperature below the melting point of the resulting metal chalcogenide which thereupon precipitates in the reaction chamber.

公开(公告)号：DK163295B

公开(公告)日：1992-02-17

申请号：DK299684

申请日：1984-06-19

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： MODONE EROS

IPC: C03B37/018 ,  C01B17/20 ,  C03B8/00 ,  C03B8/04 ,  C03B19/14 ,  C03C3/32 ,  C03C4/10 ,  C03C13/04 ,  G02B1/00 ,  G02B6/00 ,  C01B19/04

Abstract: In order to obtain substances that are optically transparent in the infrared range, usable in the manufacture of optical fibers or radiation emitters, a metal or metalloid chalcogenide other than an oxide is produced by a double-substitution reaction between a starting chalcogen compound-particularly a hydride such as H2S, H2Se or H2Te-and a salt of the desired metal or metalloid, e.g. a chloride. The starting compound and the reactant salt preferably are vaporized at a temperature below the melting point of the resulting metal chalcogenide which thereupon precipitates in the reaction chamber.

公开(公告)号：DE3664209D1

公开(公告)日：1989-08-10

申请号：DE3664209

申请日：1986-10-28

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： COCITO GIUSEPPE ,  GREGO GIORGIO ,  MODONE EROS

IPC: G02B6/00 ,  C03B37/012 ,  C03B37/018 ,  G02B6/024 ,  C23C16/04

Abstract: The method allows fabrication of optical fibres with noncircular core cross-section, with CDV technique, thanks to varying-thickness layer deposition along the internal perimeter of each section of the reaction tube wherein the fibre materials are deposited during preform fabrication.

公开(公告)号：IT1195179B

公开(公告)日：1988-10-12

申请号：IT6773286

申请日：1986-09-25

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： DE BERNARDI CARLO ,  MODONE EROS

IPC: G02B6/13 ,  C03C13/04 ,  C03C21/00 ,  G02B6/10 ,  G02B

Abstract: The method consists of diffusing a doping compound in the region of a fluorozirconate glass support, wherein the optical guide is to be fabricated. The remaining regions are suitably masked to avoid any possible ionic exchange.

公开(公告)号：NO158297C

公开(公告)日：1988-08-17

申请号：NO842438

申请日：1984-06-18

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： MODONE EROS

IPC: C01B17/20 ,  C03B8/00 ,  C03B8/04 ,  C03B37/018 ,  C03B19/14 ,  C03C3/32 ,  C03C4/10 ,  C03C13/04 ,  G02B1/00 ,  G02B6/00 ,  C03C3/12 ,  C01B19/04

Abstract: In order to obtain substances that are optically transparent in the infrared range, usable in the manufacture of optical fibers or radiation emitters, a metal or metalloid chalcogenide other than an oxide is produced by a double-substitution reaction between a starting chalcogen compound-particularly a hydride such as H2S, H2Se or H2Te-and a salt of the desired metal or metalloid, e.g. a chloride. The starting compound and the reactant salt preferably are vaporized at a temperature below the melting point of the resulting metal chalcogenide which thereupon precipitates in the reaction chamber.