FIG. 2. (a) Effective indices of the eigenmodes and (b) the effective index difference between the same OAM mode orders as a function of wavelength.
FIG. 1. Schematic of the proposed quasi-crystal fiber. The gray circles represent air holes. a is the distance between neighboring air holes and r0 to r6 are the radii of the air holes in the cladding region.
FIG. 3. (a) Electric field intensity and (b) phase distribution of the HE3,1 (OAM2,1) mode.
FIG. 4. (a) Dispersion of the eigenmodes as a function of wavelength, and enlarged dispersion of (b) HE2,1, (c) HE3,1, and EH1,1 modes. (d) The differential value of dispersion as a function of wavelength.
FIG. 5. Confinement loss of the eigenmodes as a function of wavelength.
TABLE 1. Summary of the eigenmodes performances at 1.55 μm
TABLE 2. Comparison of OAM mode performances
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