Method of and device for measuring the Kerr non-linearity coeffi

Details Method of and device for measuring the Kerr non-linearity coeffi Method of and device for measuring the Kerr non-linearity coeffi

1996-02-28

1997-04-08

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

G01N 2184, G01N 2141

Patent

active

056193211

ABSTRACT:
A train of rectangular pulses is sent into a fiber, which pulses have such a wavelength that fiber operates under anomalous dispersion conditions, such a peak power as to cause modulation instability in the fiber 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 fiber and the Kerr non linearity coefficient is obtained from the maximum measured value of modulation instability gain by minimizing 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 realize the method is also provided.

REFERENCES:
Measurement of the Nonlinear Index of Silica-Core and Dispersion Shifted-Fibers K. S. Kim et al and Reed et al, 15, Feb. 94/vol. 19, No. 4/Optics Letters.
Nonlinear Coefficient Measurements for Dispersion Shifted Fibers Using Self-Phase Y. Namihira et al, Electronics Letters, 7 Jul. 1994, vol. 30, No. 14.
Fiber Nonlinearity, Tkach, AT&T Bell Lab., Nonlinear-Index Measurement by SPM OFC '95 Technical Digest.

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