Abstract
We have improved the accuracy of the continuous-wave self-phase modulation method for measuring the
nonlinearity of optical fibers. Evaluation of the measurement uncertainty shows that the most significant source of
uncertainty is the measurement of fiber-optic power. However, chromatic dispersion can also have a significant
effect on the apparent results if it is not taken properly into account. We demonstrate means to achieve an expanded
uncertainty of 2% (coverage factor k = 2) for the measurement of the nonlinear coefficient n<sub>2</sub>/A<sub>eff</sub>. Also, the metrological aspects related to the determination of the nonlinear coefficient and the measurement uncertainty are
discussed.
© 2007 IEEE
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