Fig. 1. Time-domain evolution of solitons in homogeneous optical fiber and corresponding spectra under different conditions when ε=0,β₀=0.5,γ₀=0.2,k=1 and m=1+i. (a)(c)Time-domain evolution; (b) (d)spectra

Fig. 2. Time-domain evolution of solitons in inhomogeneous optical fiber and corresponding spectra under different conditions when ε=0.3,l=1,β₀=0.5,γ₀=0.2,k=1 and m=1+i. (a)(c)Time-domain evolution; (b) (d)spectra

Fig. 3. Time-domain evolution of two-soliton with parallel transmission and colliding evolution in homogeneous optical fibers without high-order effects and corresponding spectra. (a)(b) ε=0, k₁=1, k₂=-1.1, β₀=0.5 and γ₀=0.2; (c)(d) ε=0, k₁=1.8-0.95i, k₂=1.8+0.95i, β₀=0.1 and γ₀=0.02

Fig. 4. Time-domain evolution of two-soliton with parallel transmission and colliding evolution in homogeneous optical fibers with high-order effects and corresponding spectra. (a)(b) k₁=1, k₂=-1.1, β₀=0.5 and γ₀=0.2; (c)(d) k₁=1.8-0.95i, k₂=1.8+0.95i, β₀=0.1 and γ₀=0.02

Fig. 5. Time-domain evolution of two-soliton with quasi-parallel transmission and colliding evolution in inhomogeneous optical fibers without high-order effects and corresponding spectra. (a)(b) ε=0.3, l=1, k₁=1, k₂=-1.1, β₀=0.5 and γ₀=0.2; (c)(d) ε=0.3, l=1, k₁=1.8-0.95i, k₂=1.8+0.95i, β₀=0.1 and γ₀=0.02

Fig. 6. Time-domain evolution of two-soliton with quasi-parallel transmission and colliding evolution in inhomogeneous optical fibers with high-order effects and corresponding spectra. (a)(b) ε=0.3, l=1, k₁=1, k₂=-1.1, β₀=0.5 and γ₀=0.2; (c)(d) ε=0.3, l=1, k₁=1.8-0.95i, k₂=1.8+0.95i, β₀=0.1 and γ₀=0.02

Fig. 7. Spectra of two-soliton at collision position z=8.85. (a) Corresponding to Fig. 3 (d); (b) corresponding to Fig. 5 (d); (c) corresponding to Fig. 4 (d); (d) corresponding to Fig. 6(d)