Fig. 1. Schematic diagram of the SCF, N = 6^[25].

Fig. 2. Three major tapered categories: (a) concave tapered fiber, (b) linear tapered fiber, and (c) convex tapered fiber.

Fig. 3. Effects of different parabolic shape factors on the core radius profile (from the small end to the large end).

Fig. 4. Comparison of modal loss of straight T-SCF from the small end to the large end: (a) mode losses of LP₀₁ and LP_31e; (b) mode loss of LP_11o.

Fig. 5. Comparison of modal loss of T-SCF with a bending radius of 32 cm: (a) mode losses of LP₀₁ and LP_31e; (b) mode loss of LP_11o.

Fig. 6. (a) Modal loss and (b) effective mode area of LP₀₁ for T-SCF under various bending azimuth angles, R = 32 cm, and z = 3.3 m.

Fig. 7. The amplifier model based on T-SCF under the small-to-large amplification scheme (the doped region colored red).

Fig. 8. Modal power evolution of (a) LP₁₁ mode and (b) LP_31e mode for concave, linear, and convex T-SCF based on the small-to-large amplification scheme.

Fig. 9. (a) Effective mode area of LP₀₁ and (b) heat load density evolution along T-SCF.

Fig. 10. (a) Modal power evolution of four HOMs in linear T-SIF and (b) comparison of heat load density and effective mode area of LP₀₁ between linear T-SCF and T-SIF.

Fig. 11. Power evolution of (a) LP₁₁ mode and (b) LP_31e mode in the T-SCF under a bending radius of 32 cm.

Fig. 12. Comparison of heat load density between straight T-SCF and bent T-SCF of R = 32 cm.

Fig. 13. The amplifier model based on T-SCF under the large-to-small amplification scheme (the doped region colored red).

Fig. 14. Modal power evolution of (a) LP₁₁ mode and (b) LP_31e mode for concave, linear, and convex T-SCF under the large-to-small amplification scheme.

Fig. 15. Comparison of heat load density between the two amplification schemes.

Fig. 16. Power of (a) LP₁₁ and (b) LP_31e of the T-SCF under a bending radius of 32 cm.