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    IMPROVEMENTS TO INDUCTION FURNACES FOR THE SYNTHESIS OF GLASSES
    12.
    发明专利
    IMPROVEMENTS TO INDUCTION FURNACES FOR THE SYNTHESIS OF GLASSES 未知

    公开(公告)号：CA2243877C

    公开(公告)日：2001-05-08

    申请号：CA2243877

    申请日：1998-07-27

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： BRAGLIA MARCO ,  MOSSO SABRINA ,  DAI GUOJUN

    IPC: C03B5/02 ,  C03B5/08 ,  F27D11/06

    Abstract: In an induction furnace for the synthesis of glasses, in particular fluorozi rconate glasses for optical fibres for telecommunications, the support device (6') f or the crucible (3) is associated with a pair of sleeves (7, 9) between which an annular ele ment (8) which constitutes the actual support element is inserted. The first sleeve ( 7) has such longitudinal dimensions that the crucible (3) is supported in the annular el ement (8) in such a way as to be spaced from the planar element (5'), and the second slee ve has such longitudinal dimensions that its top edge is at a level higher than tha t of the top edge of the crucible (3), to obtain a homogeneous temperature region extendi ng at least along the entire height of the crucible (3) (Fig.2).

    IMPROVEMENTS TO INDUCTION FURNACES FOR THE SYNTHESIS OF GLASSES
    14.
    发明专利
    IMPROVEMENTS TO INDUCTION FURNACES FOR THE SYNTHESIS OF GLASSES 未知

    公开(公告)号：CA2243877A1

    公开(公告)日：1999-01-29

    申请号：CA2243877

    申请日：1998-07-27

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： BRAGLIA MARCO ,  MOSSO SABRINA ,  DAI GUOJUN

    IPC: C03B5/02 ,  C03B5/08 ,  F27D11/06

    Abstract: In an induction furnace for the synthesis of glasses, in particular fluorozircon ate glasses for optical fibres for telecommunications, the support device (6') for t he crucible (3) is associated with a pair of sleeves (7, 9) between which an annular element (8) which constitutes the actual support element is inserted. The first sleeve (7) h as such longitudinal dimensions that the crucible (3) is supported in the annular elemen t (8) in such a way as to be spaced from the planar element (5'), and the second sleeve h as such longitudinal dimensions that its top edge is at a level higher than that of the top edge of the crucible (3), to obtain a homogeneous temperature region extending a t least along the entire height of the crucible (3) (Fig.2).

    15.
    发明专利
    未知

    公开(公告)号：DE842907T1

    公开(公告)日：1998-11-12

    申请号：DE97120151

    申请日：1997-11-18

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： BRAGLIA MARCO

    IPC: G02B6/00 ,  C03B37/012 ,  C03B37/014 ,  C03B37/023 ,  C03B37/027 ,  C03C3/32 ,  C03C13/04 ,  H01S3/06 ,  H01S3/10

    Abstract: An active single mode optical fiber has the core made of a rare earth doped non-oxide glass and the cladding made of an oxide glass. The glass of the core has a melting temperature lower than that of the glass of the cladding and lying within the range of the softening temperatures of the latter. In a preferred embodiment the core is made of a chalcogenide glass and the cladding is made of a lead silicate glass. To produce the fibre, a preform, obtained by introducing an element made of the non-oxide glass into the hole (2) of a capillary tube (1) made of the oxide glass, is brought to a temperature lying within the range of softening temperatures of the oxide glass and not lower than the melting temperature of the non-oxide glass, and is drawn. The capillary tube (1), during the drawing process, serves as a container for the molten glass of the core.

    16.
    发明专利
    未知

    公开(公告)号：IT1288836B1

    公开(公告)日：1998-09-24

    申请号：ITTO960927

    申请日：1996-11-19

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： BRAGLIA MARCO

    IPC: G02B6/00 ,  C03B37/012 ,  C03B37/014 ,  C03B37/023 ,  C03B37/027 ,  C03C3/32 ,  C03C13/04 ,  H01S3/06 ,  H01S3/10

    Abstract: An active single mode optical fiber has the core made of a rare earth doped non-oxide glass and the cladding made of an oxide glass. The glass of the core has a melting temperature lower than that of the glass of the cladding and lying within the range of the softening temperatures of the latter. In a preferred embodiment the core is made of a chalcogenide glass and the cladding is made of a lead silicate glass. To produce the fibre, a preform, obtained by introducing an element made of the non-oxide glass into the hole (2) of a capillary tube (1) made of the oxide glass, is brought to a temperature lying within the range of softening temperatures of the oxide glass and not lower than the melting temperature of the non-oxide glass, and is drawn. The capillary tube (1), during the drawing process, serves as a container for the molten glass of the core.

    ACTIVE SINGLE MODE OPTICAL FIBRES AND METHOD FOR THEIR FABRICATION
    17.
    发明专利
    ACTIVE SINGLE MODE OPTICAL FIBRES AND METHOD FOR THEIR FABRICATION 未知

    公开(公告)号：CA2221060A1

    公开(公告)日：1998-05-19

    申请号：CA2221060

    申请日：1997-11-14

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： BRAGLIA MARCO

    IPC: G02B6/00 ,  C03B37/012 ,  C03B37/014 ,  C03B37/023 ,  C03B37/027 ,  C03C3/32 ,  C03C13/04 ,  H01S3/06 ,  H01S3/10 ,  G02B6/16 ,  C03B37/075 ,  H04B10/17

    Abstract: An active single mode optical fiber has the core made of a rare earth doped nonoxide glass and the cladding made of an oxide glass. The glass of the core has a melti ng temperature lower than that of the glass of the cladding and lying within the ra nge of the softening temperatures of the latter. In a preferred embodiment the core is made of a chalcogenide glass and the cladding is made of a lead silicate glass. To produ ce the fibre, a preform (6), obtained by introducing an element made of the non-oxide g lass into the hole (2) of a capillary tube (1) made of the oxide glass, is brought to a temperature lying within the range of softening temperatures of the oxide glass and not lower than the melting temperature of the non-oxide glass, and is drawn. The cap illary tube (1), during the drawing process, serves as a container for the molten glass of the core.

    18.
    发明专利
    未知

    公开(公告)号：DE672628T1

    公开(公告)日：1996-05-02

    申请号：DE95103595

    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.

    19.
    发明专利
    未知

    公开(公告)号：DE69500319D1

    公开(公告)日：1997-07-03

    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.

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