where (Y is the attenuation coefficient of the fiber, /32 is the
fiber chromatic dispersion parameter, yj = 27rn2/( XjAe~) is
the nonlinear coefficient, n2 is the nonlinear refractive index,
and XI, are the probe and the pump signal wavelengths, Aeff
is the fiber effective core area, pk = /AI, l2 and pj = IAj l2 are
optical powers of the pump and the probe, respectively. Note
that the last term in the right-hand-side (RHS) of (1) is slightly