公开(公告)号：JPH11340915A

公开(公告)日：1999-12-10

申请号：JP11830199

申请日：1999-04-26

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： CIARAMELLA ERNESTO

IPC: G02B6/00 ,  G02B6/34 ,  H04B10/02 ,  H04B10/12 ,  H04B10/135 ,  H04B10/14 ,  H04B10/18 ,  H04B10/2581 ,  H04B10/13

Abstract: PROBLEM TO BE SOLVED: To provide an optical signal transmission method where color scattering of an optical fiber transmission line is corrected and to provide a communication system using this method. SOLUTION: In the communication system with an optical fiber transmission line 3, at least one correction module 4(4A...4N) based on chirp optical fiber grating corrects color scattering caused by the optical fiber 3. The chirp optical fiber grating has a group delay characteristic τ (ω) that represents ripples around a nominal linear profile as a function of an optical signal frequency. In order to minimize the effect of the ripples, correction is conducted so that an operating point is placed in a limited gradation area of a curve denoting deterioration of system performance due to color scattering with respect to a given fiber length 3.

公开(公告)号：EP0737852A3

公开(公告)日：1998-07-08

申请号：EP96105776

申请日：1996-04-12

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： ARTIGLIA MASSIMO ,  CIARAMELLA ERNESTO ,  SORDO BRUNO

IPC: G01M11/02 ,  G01M11/00

CPC classification number: G01M11/332

Abstract: A train of rectangular pulses is sent into a fibre (5), which pulses have such a wavelength that fibre (5) operates under anomalous dispersion conditions, such a peak power as to cause modulation instability in the fibre and such a ratio between duration and repetition period that the average power is lower than the threshold at which stimulated Brillouin effect takes place. The maximum value of instability gain is measured in the spectrum of the pulses exiting the fibre and the kerr non linearity coefficient is obtained from the maximum measured value of modulation instability gain by minimising the error, in the range of power values used for the measurement, with respect to a theoretical curve expressing such maximum gain as a function of the peak power. The device to realise the method is also provided.

公开(公告)号：CA2174028C

公开(公告)日：2001-11-20

申请号：CA2174028

申请日：1996-04-12

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： ARTIGLIA MASSIMO ,  CIARAMELLA ERNESTO ,  SORDO BRUNO

IPC: G01M11/02 ,  G01M11/00

Abstract: A train of rectangular pulses is sent into a fibre (5), which pulses have such a wavelength that fibre (5) operates under anomalous dispersion conditions, such a peak power as to cause modulation instability in the fibre and such a ratio between duration and repetition period that the average power is lower than the threshold at which stimulated Brillouin effect takes place. The maximum value of instability gain is measured in the spectrum of the pulses exiting the fibre and the kerr non linearity coefficient is is obtained from the maximum measured value of modulation instability gain by minimising the error, in the range of power values used for the measurement, with respect to a theoretical curve expressing such maximum gain as a function of the peak power. The device to realise the method is also provided.

公开(公告)号：ITTO980362A1

公开(公告)日：1999-10-28

申请号：ITTO980362

申请日：1998-04-28

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： CIARAMELLA ERNESTO

IPC: G02B6/00 ,  G02B6/34 ,  H04B10/02 ,  H04B10/12 ,  H04B10/135 ,  H04B10/14 ,  H04B10/18 ,  H04B10/2581

Abstract: In a communication system with an optical fibre transmission line (3), a compensation of chromatic dispersion due to the fibre (3) is performed through at least one compensation module (4; 4A ... 4N) based on chirped optical fibre gratings having a group delay characteristic @ ( omega ) which exhibits ripples around a nominally linear profile, as a function of the optical signal frequency. To minimise the effect of said ripples, the compensation is carried out in such a way that, for a given fibre length (3), the operating point is located in a limited slope region along the curve representative of system performance degradation owing to chromatic dispersion.

公开(公告)号：CA2270305A1

公开(公告)日：1999-10-28

申请号：CA2270305

申请日：1999-04-27

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： CIARAMELLA ERNESTO

IPC: G02B6/00 ,  G02B6/34 ,  H04B10/02 ,  H04B10/12 ,  H04B10/135 ,  H04B10/14 ,  H04B10/18 ,  H04B10/2581

Abstract: In a communication system with an optical fibre transmission line, a compensation of chromatic dispersion due to the fibre is performed through at least one compensation module based on chirped optical fibre gratings having a group delay characteristic ~(.omega.) which exhibits ripples around a nominally linear profile, as a function of the optical signal frequency. To minimise the effect of said ripples, the compensation is carried out in such a way that, for a given fibre length, the operating point is located in a limited slope region along the curve representative of system performance degradation owing to chromatic dispersion.

公开(公告)号：IT1280866B1

公开(公告)日：1998-02-11

申请号：ITTO950290

申请日：1995-04-13

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： ARTIGLIA MASSIMO ,  CIARAMELLA ERNESTO ,  SORDO BRUNO

IPC: G01M11/02 ,  G01M11/00

Abstract: A train of rectangular pulses is sent into a fibre (5), which pulses have such a wavelength that fibre (5) operates under anomalous dispersion conditions, such a peak power as to cause modulation instability in the fibre and such a ratio between duration and repetition period that the average power is lower than the threshold at which stimulated Brillouin effect takes place. The maximum value of instability gain is measured in the spectrum of the pulses exiting the fibre and the kerr non linearity coefficient is obtained from the maximum measured value of modulation instability gain by minimising the error, in the range of power values used for the measurement, with respect to a theoretical curve expressing such maximum gain as a function of the peak power. The device to realise the method is also provided.

公开(公告)号：DE767395T1

公开(公告)日：1998-11-12

申请号：DE96115798

申请日：1996-10-02

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： ARTIGLIA MASSIMO ,  CIARAMELLA ERNESTO

IPC: G02F1/35 ,  G02F2/00 ,  H01S3/067 ,  H04B10/02 ,  H04B10/17 ,  H04B10/18 ,  H04B10/29 ,  H01S3/06

Abstract: The modification is accomplished on the basis of the solution known as spectral inversion (or optical phase conjugation). The device (1) comprises a medium, such as typically a dispersion shifted optical fibre (4), into which the signal to be modified is injected together with a pump signal at such a level as to induce modulation instability in the fibre (4). At the output of fibre (4) a spectrally inverted optical signal is available, which signal is translated in wavelength and is obtained with high conversion efficiency. Preferably, in order to avoid stimulated Brillouin scattering, the pump signal is subjected to spectrum broadening, for instance by means of a modulator (5).

公开(公告)号：ITTO950290A1

公开(公告)日：1996-10-14

申请号：ITTO950290

申请日：1995-04-13

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： ARTIGLIA MASSIMO ,  CIARAMELLA ERNESTO ,  SORDO BRUNO

IPC: G01M11/02 ,  G01M11/00

公开(公告)号：CA2174028A1

公开(公告)日：1996-10-14

申请号：CA2174028

申请日：1996-04-12

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： ARTIGLIA MASSIMO ,  CIARAMELLA ERNESTO ,  SORDO BRUNO

IPC: G01M11/02 ,  G01M11/00

Abstract: A train of rectangular pulses is sent into a fibre (5), which pulses have such a wavelength that fibre (5) operates under anomalous dispersion conditions, such a peak power as to cause modulation instability in the fibre and such a ratio between duration and repetition period that the average power is lower than the threshold at which stimulated Brillouin effect takes place. The maximum value of instability gain is measured in the spectrum of the pulses exiting the fibre and the kerr non linearity coefficient is obtained from the maximum measured value of modulation instability gain by minimising the error, in the range of power values used for the measurement, with respect to a theoretical curve expressing such maximum gain as a function of the peak power. The device to realise the method is also provided.

公开(公告)号：DE737852T1

公开(公告)日：1999-02-25

申请号：DE96105776

申请日：1996-04-12

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： ARTIGLIA MASSIMO ,  CIARAMELLA ERNESTO ,  SORDO BRUNO

IPC: G01M11/02 ,  G01M11/00 ,  G01N21/41

Abstract: A train of rectangular pulses is sent into a fibre (5), which pulses have such a wavelength that fibre (5) operates under anomalous dispersion conditions, such a peak power as to cause modulation instability in the fibre and such a ratio between duration and repetition period that the average power is lower than the threshold at which stimulated Brillouin effect takes place. The maximum value of instability gain is measured in the spectrum of the pulses exiting the fibre and the kerr non linearity coefficient is obtained from the maximum measured value of modulation instability gain by minimising the error, in the range of power values used for the measurement, with respect to a theoretical curve expressing such maximum gain as a function of the peak power. The device to realise the method is also provided.