(a) The evolution of MI from a CW input calculated for the anomalous dispersion with r = −1, s = −1.2, f_AB = 0.53, f_BB = 0.72, δ₁ = 2, P₁ = 0.9, P₂ = 0.1, P_1x/P₁ = 0.4, P_1y/P₁ = 0.6, P_2x/P₂ = 0.1, and P_2y/P₂ = 0.9; (b) the waves in the x- and y-polarizations of each mode at ξ = 0 (red line) and ξ = 13 (blue line).