Fig. 1. Schematic diagram of fiber 2D cross-section; (b) Fiber refractive index distribution

Fig. 2. Mesh generation of cross-section of proposed fiber

Fig. 3. (a) Bending loss of FM and HOMs; (b) Mode field area of FM and variation of high-fundament loss ratio with r

Fig. 4. (a) Bending loss of FM and HOMs; (b) Mode field area of FM; (c) Variation of high-fundament loss ratio with t and t₂

Fig. 5. (a) Bending loss of FM and HOMs; (b) Mode field area of FM; (c) Variation of high-fundament loss ratio with t₁ and d

Fig. 6. (a) Bending loss of FM and HOMs; (b) Mode field area of FM; (c) Variation of high-fundament loss ratio with d₁ and t₃

Fig. 7. (a1)-(c1) Electric mode field distribution of FM when the refractive index ring are trapezoidal, rectangular, Triangle; (a2)-(c2) Electric mode field distribution of HOMs when the refractive index ring are trapezoid, rectangular, triangle

Fig. 8. (a) Bending loss of FM and HOMs; (b) Mode field area of FM and bending loss ratio with the number of trenches

Fig. 9. (a1)-(d1) Electric field distribution of FM with 0 type trench to 3 types trenches; (a2)-(d2) Electric field distribution of HOMs with 0 type trench to 3 types trenches

Fig. 10. Change trend of FM, HOMs and effective mode field area with thermal load