Fig. 1. Ocean turbulence phase screen

Fig. 2. Simulation of DLGVB beam transmission through an ocean turbulent phase screen

Fig. 3. Three-dimensional diagram of light intensity，phase and intensity transmitted by DLGVB beam under ocean turbulence

Fig. 4. Scintillation index of DLGVB beam with topological charge difference under different ocean turbulence parameters

Fig. 5. Scintillation index of DLGVB beam varies with the transmission distance under different ocean turbulence parameters

Fig. 6. Change of bit error rate of DLGVB beam with SNR under different turbulent kinetic energy dissipation rates

Fig. 7. Bit error rate of DLGVB beam at different temperature variance dissipation rates

Fig. 8. Bit error rate of DLGVB beam under different salinity temperature contribution ratio

Fig. 9. Change of bit error rate of DLGVB beam communication with SNR under different topological charge difference v（v<10）