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：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：DE2818674A1

公开(公告)日：1978-11-09

申请号：DE2818674

申请日：1978-04-27

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： COSTA BRUNO ,  SORDO BRUNO

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

Abstract: To intercept and measure radiant energy back-scattered from the entrance end of an optical fiber irradiated by a pulsed laser beam, a semitransparent mirror is interposed between the irradiated fiber and a first lens assembly focusing the laser beam upon its entrance end while a second lens assembly directs reflected light rays toward a photodetector feeding an electronic processor. An extremity of the fiber including its entrance end is received in a chamber with light-absorbing walls filled with a liquid of substantially the same refractive index as the fiber; the mirror may be disposed either in front of the chamber entrance or in its interior.

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：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.

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.