Fig. 1. Phase and intensity of Laguerre-Gaussian beams with p=1 and m=3. (a) Phase; (b) intensity

Fig. 2. Light intensity produced by the coherent superposition of U_0,10 and U_0,3. (a) Theoretical result; (b) experimental result

Fig. 3. Structure diagram of multiband multiband vortex optical communication system

Fig. 4. Dual-channel multiband modulation signal. (a) First signal; (b) second signal

Fig. 5. Encoding method

Fig. 6. 16 kinds of superimposed light intensity correlations. (a) Beam groups {U_0,4,U_0,6,U_0,8,U_0,10} and {U_0,2,U_0,3,U_1,2,U_1,3}; (b) beam groups {U_0,4,U_0,6,U_0,8,U_0,10} and {U_0,-2,U_0,-3,U_1,2,U_1,3}

Fig. 7. Phase distribution diagrams corresponding to 16 symbols. The left side represents the phase diagrams, the middle represents the theoretical simulation diagrams at z=0 m, and the right side is the light intensity diagrams recorded by the CCD camera at z=1 m

Fig. 8. Atmospheric turbulence phase simulation diagram at Cn2=1×10^-14 m^-2/3. (a) 3D simulation; (b) phase screen

Fig. 9. Light intensity diagrams under different atmospheric turbulence conditions. (a) Cn2=1×10^-17 m^-2/3; (b) Cn2=1×10^-14 m^-2/3

Fig. 10. Structure diagram of VGG16 model

Fig. 11. Training data set

Fig. 12. Test accuracy and test loss during training process