Typical evolution plots of fundamental mode solitons with different initial phase-front curvatures (a) C = −0.5 and (b) C = 0.1 in the system described by Eqs. (1) and (3); dependence of (c) deviation distance Δ and (d) escape angle α_end on initial phase-front curvature C for fundamental mode solitons. Other parameters are p = 0.5, Ω = 0.5, μ = 0.1, z₀ = 20, and U = 2.