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1.发明公开Method of and device for measuring the kerr non linearity coefficient in a single mode optical fibre 失效方法和装置用于测量单模光纤的克尔非线性系数
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
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.
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2.发明专利
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
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.
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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
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.
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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
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).
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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
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Patent Agency Ranking6.发明专利
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
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.
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公开(公告)号：CA2150418A1
公开(公告)日：1995-12-01
申请号：CA2150418
申请日：1995-05-29
Applicant: CSELT CENTRO STUDI LAB TELECOM
Inventor： ARTIGLIA MASSIMO , CAPONI RENATO , CISTERNINO FRANCESCO , NADDEO CLAUDIO , ROCCATO DIEGO
Abstract: To measure the nonlinear refractive index of an optical fibre, each pulse emitted by a source (L) is split into a pair of pulses which are sent in opposite directions into an optical-fibre Sagnac interferometric loop (AS) which includes the fibre under test (F). One of the pulses of the pair is attenuated before passing through the fibre (F) in such a way that only the other one has such a power as to induce nonlinear effects in the fibre (F). The interference between parts of pulses is analysed at the output of the loop (AS) and the nonlinear refractive index is derived from a measurement of the phase shift between the two pulses of the pair.
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公开(公告)号：IT1266016B1
公开(公告)日：1996-12-16
申请号：ITTO940443
申请日：1994-05-30
Applicant: CSELT CENTRO STUDI LAB TELECOM
Inventor： ARTIGLIA MASSIMO , CAPONI RENATO , CISTERNINO FRANCESCO , NADDEO CLAUDIO , ROCCATO DIEGO
Abstract: To measure the nonlinear refractive index of an optical fibre, each pulse emitted by a source (L) is split into a pair of pulses which are sent in opposite directions into an optical-fibre Sagnac interferometric loop (AS) which includes the fibre under test (F). One of the pulses of the pair is attenuated before passing through the fibre (F) in such a way that only the other one has such a power as to induce nonlinear effects in the fibre (F). The interference between parts of pulses is analysed at the output of the loop (AS) and the nonlinear refractive index is derived from a measurement of the phase shift between the two pulses of the pair.
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公开(公告)号：ITTO950782D0
公开(公告)日：1995-10-02
申请号：ITTO950782
申请日：1995-10-02
Applicant: CSELT CENTRO STUDI LAB TELECOM
Inventor： ARTIGLIA MASSIMO
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).
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公开(公告)号：ITTO940443D0
公开(公告)日：1994-05-30
申请号：ITTO940443
申请日：1994-05-30
Applicant: CSELT CENTRO STUDI LAB TELECOM
Inventor： ARTIGLIA MASSIMO , CAPONI RENATO , CISTERNINO FRANCESCO , NADDEO CLAUDIO , ROCCATO DIEGO
Abstract: To measure the nonlinear refractive index of an optical fibre, each pulse emitted by a source (L) is split into a pair of pulses which are sent in opposite directions into an optical-fibre Sagnac interferometric loop (AS) which includes the fibre under test (F). One of the pulses of the pair is attenuated before passing through the fibre (F) in such a way that only the other one has such a power as to induce nonlinear effects in the fibre (F). The interference between parts of pulses is analysed at the output of the loop (AS) and the nonlinear refractive index is derived from a measurement of the phase shift between the two pulses of the pair.
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