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    2.
    发明专利
    未知

    公开(公告)号：DE2720108A1

    公开(公告)日：1977-12-22

    申请号：DE2720108

    申请日：1977-05-05

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： VITA PIETRO DI

    IPC: G02B6/14 ,  G02B6/32 ,  H04B9/00

    Abstract: Signals, especially short pulses, are transmitted by way of cascaded light guides with internally reflecting boundaries (i.e. fibers or foils) between which a transparent body of graded refractive index is interposed. The refractive index of the body varies, on opposite sides of a centerline coinciding with the axes of the aligned guides, according to a parabolic law, increasing from the centerline outwardly over a radial distance ro and then decreasing in a symmetrical manner over a like radial distance, whereby light rays incident at various angles on an entrance face of the body are deflected onto a generally sinusoidal path which peaks at a radial distance 2ro. The axial length of the body equals three quarter-wavelengths of the sine curve whereby substantially axially incident rays emerge from an exit face of the body at a limiting angle theta M, and vice versa, the radial distance ro being given by ro = sxtan theta M where s is the axial distance between the confronting ends of the light guides and the adjoining body faces.

    5.
    发明专利
    未知

    公开(公告)号：FR2351424A1

    公开(公告)日：1977-12-09

    申请号：FR7713553

    申请日：1977-05-04

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： VITA PIETRO DI

    IPC: G02B6/14 ,  G02B6/32 ,  G02B7/00 ,  G02B5/14

    Abstract: Signals, especially short pulses, are transmitted by way of cascaded light guides with internally reflecting boundaries (i.e. fibers or foils) between which a transparent body of graded refractive index is interposed. The refractive index of the body varies, on opposite sides of a centerline coinciding with the axes of the aligned guides, according to a parabolic law, increasing from the centerline outwardly over a radial distance ro and then decreasing in a symmetrical manner over a like radial distance, whereby light rays incident at various angles on an entrance face of the body are deflected onto a generally sinusoidal path which peaks at a radial distance 2ro. The axial length of the body equals three quarter-wavelengths of the sine curve whereby substantially axially incident rays emerge from an exit face of the body at a limiting angle theta M, and vice versa, the radial distance ro being given by ro = sxtan theta M where s is the axial distance between the confronting ends of the light guides and the adjoining body faces.

    8.
    发明专利
    未知

    公开(公告)号：IT1107326B

    公开(公告)日：1985-11-25

    申请号：IT6793278

    申请日：1978-04-26

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： VITA PIETRO DI

    IPC: G02B6/28 ,  H04B10/213 ,  G02B

    Abstract: The coupler comprises one or more optical systems formed by or equivalent to a set of reflecting surfaces (4,5,6) whose sections are segments of ellipses having two by two a common focus (1A, 2A, 3A); each focus lies in the centre of the end face of an optical waveguide (1,2,3) able both to launch a light beam to be shared among other waveguides, and to collect either a light beam resulting from a sharing or more light beams to be combined.

    9.
    发明专利
    未知

    公开(公告)号：IT8468224D0

    公开(公告)日：1984-12-10

    申请号：IT6822484

    申请日：1984-12-10

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： COPPA GIANNI ,  VITA PIETRO DI

    IPC: G01J1/00 ,  G01J1/02 ,  G01J1/42 ,  G01J4/00 ,  G01M11/00 ,  G01B

    Abstract: A method and an apparatus are provided wherein a light beam is passed through a slit (7) oscillating with respect to the beam, and a periodic signal is obtained from the beam portion traversing the slit and is split into its spectral components. Moment values are derived from the values of the amplitudes of such components.

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