公开(公告)号：JPS62119427A

公开(公告)日：1987-05-30

申请号：JP26791886

申请日：1986-11-12

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： CAPONI RENATO ,  COPPA GIANNI ,  DI VITA PIETRO

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

公开(公告)号：EP0745837A3

公开(公告)日：1998-10-07

申请号：EP96108754

申请日：1996-05-31

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： CALVANI RICCARDO ,  CAPONI RENATO ,  NADDEO CLAUDIO ,  ROCCATO DIEGO

IPC: G01M11/02 ,  G01M11/00

CPC classification number: G01M11/332 ,  G01M11/335

Abstract: A train of transform-limited optical pulses with wavelength close to the zero-dispersion wavelength of the fibre (2) and high and variable peak power, such as to give rise to self-phase modulation, is sent into a fibre (2); the spectral broadening of the signal exiting the fibre (2) is measured for a number of values of the peak power of the pulses and the nonlinear refractive index is obtained from the angular coefficient of the straight line representing spectral broadening versus peak power. The device for carrying out the method is also provided.

公开(公告)号：DE745837T1

公开(公告)日：1999-05-20

申请号：DE96108754

申请日：1996-05-31

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： CALVANI RICCARDO ,  CAPONI RENATO ,  NADDEO CLAUDIO ,  ROCCATO DIEGO

IPC: G01M11/02 ,  G01M11/00

Abstract: A train of transform-limited optical pulses with wavelength close to the zero-dispersion wavelength of the fibre (2) and high and variable peak power, such as to give rise to self-phase modulation, is sent into a fibre (2); the spectral broadening of the signal exiting the fibre (2) is measured for a number of values of the peak power of the pulses and the nonlinear refractive index is obtained from the angular coefficient of the straight line representing spectral broadening versus peak power. The device for carrying out the method is also provided.

公开(公告)号：CA2209185A1

公开(公告)日：1998-01-02

申请号：CA2209185

申请日：1997-06-27

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： CAPONI RENATO ,  CALVANI RICCARDO

IPC: H04B10/00 ,  G02F1/365 ,  H04B10/04 ,  H04B10/06 ,  H04B10/142 ,  H04B10/152 ,  H04B10/18

Abstract: Transform-limited ultrashort optical pulses are obtained by sending into a dispersion-shifted optical fibre pulses of such duration and intensity as to produce self-phase modulation. The pulses are also made to travel through a conventional fibre with suitable dispersion and are subjected to optical filtering, so as to compensate, for a particular peak power, the phase effect due to the chirp. Pulse peak power is selected so as to coincide with the vertex of the parabola plotting the square of the duration of the outgoing pulse versus the peak power of the incoming signal.

公开(公告)号：DE69210506D1

公开(公告)日：1996-06-13

申请号：DE69210506

申请日：1992-07-02

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： CALVANI RICCARDO ,  CAPONI RENATO ,  MARONE GIUSEPPE

IPC: G02F2/00 ,  H04B10/04 ,  H04B10/06 ,  H04B10/135 ,  H04B10/142 ,  H04B10/152 ,  H04B10/14

公开(公告)号：DE668640T1

公开(公告)日：1996-02-15

申请号：DE95102410

申请日：1995-02-21

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： CALVANI RICCARDO ,  CAPONI RENATO ,  CISTERNINO FRANCESCO ,  ROCCATO DIEGO

IPC: G02F1/35 ,  H01S3/04 ,  H01S3/10 ,  H01S5/00 ,  H01S5/06 ,  H01S5/062 ,  H01S5/10 ,  H01S3/00 ,  H01S3/103 ,  H04B10/14

公开(公告)号：IT1250198B

公开(公告)日：1995-04-03

申请号：ITTO910518

申请日：1991-07-04

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： CALVANI RICCARDO ,  CAPONI RENATO ,  MARONE GIUSEPPE

IPC: H04B10/04 ,  H04B10/06 ,  G02F2/00 ,  H04B10/135 ,  H04B10/142 ,  H04B10/152 ,  H04B ,  G02F

Abstract: A coherent optical communications system using polarisation modulation, wherein the polarisation modulation of the optical signals is obtained by using two lasers (1, 2) emitting orthogonally polarised radiations at different frequencies, which are combined without losses prior to transmission over the line.

公开(公告)号：ITTO940104D0

公开(公告)日：1994-02-22

申请号：ITTO940104

申请日：1994-02-22

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： CALVANI RICCARDO ,  CAPONI RENATO ,  CISTERNINO FRANCO ,  ROCCATO DIEGO

IPC: G02F1/35 ,  H01S3/04 ,  H01S3/10 ,  H01S5/00 ,  H01S5/06 ,  H01S5/062 ,  H01S5/10

公开(公告)号：DE68908013T2

公开(公告)日：1994-01-05

申请号：DE68908013

申请日：1989-05-23

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： CALVANI RICCARDO ,  CAPONI RENATO

IPC: G01R31/26 ,  G02F3/02 ,  H01S5/00 ,  H01S5/042 ,  H01S5/06 ,  H01S5/50 ,  G02F3/00 ,  H01S3/23

Abstract: The characteristic parameters of a semiconductor laser (1) acting as an amplifier and brought to bistable operating conditions are determined. To this aim the output power (I2) of laser (1) is measured as a function of the power (I1) of an amplitude-modulated optical input signal to determine the laser hysteresis loop; the switching points (P1, P2) between the two stable states of the laser (1) are identified, the input and output power values [I2(P1), I1(P1), I2(P2), I1(P2)] relevant to such points are memorized, and at least the value of the non-linear refractive index coefficient (n2) of the material used to fabricate the laser (1) is determined starting from the power values relevant to at least one of said points (P1, P2). By exploiting the power values relevant to both switching points (P1, P2) also the amplification factor (A), the finesse parameter (F) of the passive cavity of the laser (1) and the wavelength difference ( lambda 1- lambda 2) between the laser under test (1) and a second laser (3) generating the optical signal causing the laser under test (1) to operate under bistable conditions are measured.

公开(公告)号：DE68908013D1

公开(公告)日：1993-09-09

申请号：DE68908013

申请日：1989-05-23

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： CALVANI RICCARDO ,  CAPONI RENATO

IPC: G01R31/26 ,  G02F3/02 ,  H01S5/00 ,  H01S5/042 ,  H01S5/06 ,  H01S5/50 ,  G02F3/00 ,  H01S3/23

Abstract: The characteristic parameters of a semiconductor laser (1) acting as an amplifier and brought to bistable operating conditions are determined. To this aim the output power (I2) of laser (1) is measured as a function of the power (I1) of an amplitude-modulated optical input signal to determine the laser hysteresis loop; the switching points (P1, P2) between the two stable states of the laser (1) are identified, the input and output power values [I2(P1), I1(P1), I2(P2), I1(P2)] relevant to such points are memorized, and at least the value of the non-linear refractive index coefficient (n2) of the material used to fabricate the laser (1) is determined starting from the power values relevant to at least one of said points (P1, P2). By exploiting the power values relevant to both switching points (P1, P2) also the amplification factor (A), the finesse parameter (F) of the passive cavity of the laser (1) and the wavelength difference ( lambda 1- lambda 2) between the laser under test (1) and a second laser (3) generating the optical signal causing the laser under test (1) to operate under bistable conditions are measured.