Abstract
The availability of an accurate value of the Kerr nonlinear in-dex, n2 of the optical fibers used in the transmission lines is an important issue. The measurement of n2 is actually obtained by the evaluation of the Kerr-induced phase shift in self,1 or cross-2 phase-modulation schemes. Unfortunately, the n2 value recovered by these methods contains an uncertainty due to the polarization parameter b and n2 is accurately evaluated only when probe and pump (or pump alone in the self technique) propagate on the main axis of a polarization-holding fiber. The common optical fibers present stress-induced birefringence, which perturbs the state of polarization (SOP) of the guided light, hence affecting the measurement of n2. In particular, in the cross-phase-modulation scheme, the polarization parameter b assumes values oscillating between "1" and "1 /3" (pump and probe with parallel and orthogonal polarization respectively).2
© 1996 Optical Society of America
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