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    35.
    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.

    38.
    发明专利
    未知

    公开(公告)号：DE69117426T2

    公开(公告)日：1996-08-22

    申请号：DE69117426

    申请日：1991-10-21

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： COCITO GIUSEPPE ,  GREGO GIORGIO

    IPC: G01J9/04 ,  G01N21/41

    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.

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