公开(公告)号：IT1245420B

公开(公告)日：1994-09-20

申请号：ITTO910136

申请日：1991-02-27

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： BRAGLIA MARCO ,  COCITO GIUSEPPE ,  DE FRANCESCHI ROBERTO

IPC: G02B6/13 ,  G02B

公开(公告)号：DE69500319T2

公开(公告)日：1997-10-09

申请号：DE69500319

申请日：1995-03-13

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： BRAGLIA MARCO ,  COCITO GIUSEPPE

IPC: G02B6/00 ,  C03B37/012 ,  C03B37/014 ,  C03C13/04

Abstract: Fluoride glass optical fibres are fabricated by minimizing the number of high-temperature operations. A tube comprising an external layer of a first fluoride glass of composition suitable to form the cladding of the fibre and an internal layer of a second fluoride glass of composition suitable to form the core of the fibre is prepared from a melt by a conventional rotational casting technique. Then, the internal layer is thinned by means of chemical etching at ambient temperature until the attainment of a ratio between the volumes of the two layers that corresponds to the ratio between the core and cladding diameters required for a single mode fibre, and the resulting tube is drawn.

公开(公告)号：IT1267418B1

公开(公告)日：1997-02-05

申请号：ITTO940186

申请日：1994-03-16

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： BRAGLIA MARCO ,  COCITO GIUSEPPE

IPC: G02B6/00 ,  C03B37/012 ,  C03B37/014 ,  C03C13/04

Abstract: Fluoride glass optical fibres are fabricated by minimizing the number of high-temperature operations. A tube comprising an external layer of a first fluoride glass of composition suitable to form the cladding of the fibre and an internal layer of a second fluoride glass of composition suitable to form the core of the fibre is prepared from a melt by a conventional rotational casting technique. Then, the internal layer is thinned by means of chemical etching at ambient temperature until the attainment of a ratio between the volumes of the two layers that corresponds to the ratio between the core and cladding diameters required for a single mode fibre, and the resulting tube is drawn.

公开(公告)号：DE69202277D1

公开(公告)日：1995-06-08

申请号：DE69202277

申请日：1992-02-27

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： BRAGLIA MARCO ,  COCITO GIUSEPPE ,  DE FRANCESCHI ROBERTO

IPC: G02B6/13 ,  G02B6/12