Determination of nondiagonal component n 2B⟂ of nonlinear refractive index in polarisation-maintaining fibres utilising optical Kerr modulation scheme

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Abstract
The nondiagonal component n2B⟂ of the nonlinear refractive index is measured relative to the diagonal component n2B∥, in polarisation-maintaining fibres utilising optical Kerr modulation properties in the presence of chromatic and polarisation dispersion. The ratio n2B⟂/n2B∥ is determined to be 0·34 and is in good agreement with the theoretical prediction of 1/3, which assumes isotropic media and a pure electronic contribution.