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63 records (took 0.062 seconds)

    51.
    发明专利
    未知

    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.

    52.
    发明专利
    未知

    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.

    55.
    发明专利
    未知

    公开(公告)号：IT9067814D0

    公开(公告)日：1990-10-22

    申请号：IT6781490

    申请日：1990-10-22

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： COCITO GIUSEPPE ,  GREGO GIORGIO

    IPC: G01J9/04 ,  G01N21/41 ,  G01N21/45

    Abstract: The system uses a monochromatic radiation source (1) and an acousto-optic modulator (2), which is driven by a periodically variable frequency. The modulator emits a first beam having the same wavelength as the source and a second beam, whose wavelength and emission direction vary with the modulating frequency. After the second beam has been collimated, radiations of both beams are sent towards the component under test and an electrical signal with varying frequency is generated representative of the beat between such radiations at the output from the component. A spectral analysis of the beat signal is carried out, and the refractive index value is derived from the position taken by the various frequencies of the beat signal on a detection plane.

    DEVICE FOR SPLICING OPTICAL FIBRES AND CABLES
    60.
    发明专利
    DEVICE FOR SPLICING OPTICAL FIBRES AND CABLES 未知

    公开(公告)号：CA1104396A

    公开(公告)日：1981-07-07

    申请号：CA302415

    申请日：1978-05-02

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： COCITO GIUSEPPE ,  MICHETTI LEONARDO

    IPC: G02B6/38 ,  H02G15/08 ,  G02B5/14

    Abstract: Optical fibres to be spliced are aligned by being pushed into the ends of a tubular housing in which they are secured by being pushed by resilient elements into a V-guide. The resilient elements may be spring tongues pressed out of one wall of a housing faces of which also form the V-guide, and a number of Vguides may be assembled into a common housing where a multifibre cable is being spliced. The housing in each case allows lateral access to the point of abutment of the fibres so that a gluing or refractive index matching material may be applied.

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