A simple four-wave-mixing (FWM)-based method for measuring the ratio between the third- and the fourth-order dispersion coefficients in optical fibers is reported. The FWM interaction involves a low power laser and a low power amplified spontaneous emission noise source. The method is applied in several dispersion-shifted and non-zero-dispersion-shifted fibers with lengths varying from 0.03 to , and we have obtained an error of less than 3% in measuring . In highly nonlinear fibers the error has presented a strong dependency with longitudinal variations of the zero-dispersion wavelength ; an error less than 20% could be obtained in most of the tested fibers. Our method also allows for a fast estimation of the distribution of fluctuations of along the fiber.
© 2007 Optical Society of America
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