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    22.
    发明专利
    未知

    公开(公告)号：ITTO981032D0

    公开(公告)日：1998-12-10

    申请号：ITTO981032

    申请日：1998-12-10

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： CALVANI RICCARDO ,  CISTERNINO FRANCESCO ,  RICCARDI EMILIO ,  GIRADI RAFFAELE

    IPC: G02F1/35 ,  H04J3/00 ,  H04J14/08

    Abstract: This invention concerns a method of and a device for optical demultiplexing that are based on the four wave mixing between the signals to be demultiplexed and pump signals. The two signals are fed into a polarisation maintaining fibre (14), which divides them into two components with orthogonal polarisation, separated in time; and the four wave mixing is performed separately on the two components, thereby originating two separate signals that are polarisation-rotated and re-combined.

    25.
    发明专利
    未知

    公开(公告)号：DE3776026D1

    公开(公告)日：1992-02-27

    申请号：DE3776026

    申请日：1987-08-06

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： CALVANI RICCARDO ,  CAPONI RENATO ,  CISTERNINO FRANCESCO

    IPC: G01J4/00 ,  G01J4/04 ,  G01J9/02 ,  G01J9/04 ,  G01N21/21 ,  H04B10/08

    Abstract: The interferometer makes use of an acousto-optic device (11, 21) to perform a frequency shift of the beam sent along one of the interferometer branches, so as to allow the determination of the state of polarization by heterodyne radiofrequency detection. The acousto-optic deuce can be inserted downstream the means (8) splitting the beam emitted by the source (1) into the two beams sent along the two interferometer branches, or it can also act as the beam splitter.

    26.
    发明专利
    未知

    公开(公告)号：DE3864743D1

    公开(公告)日：1991-10-17

    申请号：DE3864743

    申请日：1988-05-18

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： CALVANI RICCARDO ,  CAPONI RENATO ,  CISTERNINO FRANCESCO ,  COPPA GIANNI

    IPC: G01M11/00 ,  G01M11/02 ,  G01N21/23 ,  G02B6/00

    Abstract: A constant force perpendicular to the fibre axis is applied to the fibre (2) so as to cause a power coupling from the fundamental mode, which is guided, to a secondary mode which is irradiated, and the intensity of the scattered radiation associated with that secondary mode is measured. Such intensity depends on the local state of polarization. By displacing the force application point step by step along the fibre axis and by measuring for each point the intensity of the scattered radiation, beat length is obtained as the distance between two consecutive points where the scattered radiation has the same intensity.

    28.
    发明专利
    未知

    公开(公告)号：DE3580807D1

    公开(公告)日：1991-01-17

    申请号：DE3580807

    申请日：1985-08-21

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： CALVANI RICCARDO ,  CISTERNINO FRANCESCO ,  CAPONI RENATO

    IPC: G01J4/04 ,  G01J4/00 ,  G01J9/04 ,  G01N21/21

    Abstract: The method and the device are based on interference techniques. Two quasi-monochromatic radiations (2a, 2b; 102a, 102b; 202a, 202b) with slightly different optical frequencies are generated. A radiation is converted into a 45 DEG linearly-polarized radiation, while the other presents the polarization state imposed by a body under test (4, 204). In each radiation, horizontal and vertical polarization components are separated, and then recombined into two different beams (20a, 21a; 34, 35) comprising radiations at both frequencies, respectively polarized in the same plane. Beatings between the two components of each beam are originated and from the two electrical signals in the radio frequency range thus obtained the information is extracted on the relative phase and the amplitude of the two components of the radiation with polarization imposed by the body under test (4, 204).

    29.
    发明专利
    未知

    公开(公告)号：IT8667643D0

    公开(公告)日：1986-08-08

    申请号：IT6764386

    申请日：1986-08-08

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： CAPONI RICCARDO CALVANI RENATO ,  CISTERNINO FRANCESCO

    IPC: G01J4/00 ,  G01J4/04 ,  G01J9/02 ,  G01J9/04 ,  G01N21/21 ,  H04B10/08 ,  G01J

    Abstract: The interferometer makes use of an acousto-optic device (11, 21) to perform a frequency shift of the beam sent along one of the interferometer branches, so as to allow the determination of the state of polarization by heterodyne radiofrequency detection. The acousto-optic deuce can be inserted downstream the means (8) splitting the beam emitted by the source (1) into the two beams sent along the two interferometer branches, or it can also act as the beam splitter.

    30.
    发明专利
    未知

    公开(公告)号：IT8467838D0

    公开(公告)日：1984-08-22

    申请号：IT6783884

    申请日：1984-08-22

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： CAPONI RICCARDO CALVANI RENATO ,  CISTERNINO FRANCESCO

    IPC: G01J4/04 ,  G01J4/00 ,  G01J9/04 ,  G01N21/21 ,  G02B

    Abstract: The method and the device are based on interference techniques. Two quasi-monochromatic radiations (2a, 2b; 102a, 102b; 202a, 202b) with slightly different optical frequencies are generated. A radiation is converted into a 45 DEG linearly-polarized radiation, while the other presents the polarization state imposed by a body under test (4, 204). In each radiation, horizontal and vertical polarization components are separated, and then recombined into two different beams (20a, 21a; 34, 35) comprising radiations at both frequencies, respectively polarized in the same plane. Beatings between the two components of each beam are originated and from the two electrical signals in the radio frequency range thus obtained the information is extracted on the relative phase and the amplitude of the two components of the radiation with polarization imposed by the body under test (4, 204).

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