The 8/9 normalization coefficient for the nonlinear refractive index in nonpolarization-maintaining optical fibers is confirmed directly by measurement of the ratio of the self- and cross-phase modulation coefficients for two orthogonal polarizations. The nonlinear phase shift is accurately measured with a dual-frequency beat signal as a pump source.
© 1996 Optical Society of America
S. V. Chernikov and J. R. Taylor, "Measurement of normalization factor of n2 for random polarization in optical fibers," Opt. Lett. 21, 1559-1561 (1996)