To overcome the atmospheric turbulence aberration, and improve the quality of light beam in visible light communication (VLC), a compact 69-element deformable mirror (DM) using micro voice coil actuators was designed based on systematic theoretical analysis. The structural parameters of the micro voice coil actuator were optimized by electromagnetic theory and the finite element method. The DM was optimized from the aspects of thermal deformation, response time, coupling coefficient, and other parameters. Finally, wavefront fitting and residual calculation were completed according to the influence function. The optimized voice coil deformable mirror (VCDM) has a large phase stroke, good thermal stability, a short response time of less than 0.7 ms, and a large first resonance of 2045 Hz. The fitting residuals of the VCDM for the first 10 Zernike modes with a PV value of 8 μm are all below 10 nm (RMS). Compared with a similar DM, the obtained results from our compact VCDM indicate that it has a higher wavefront fitting precision. VCDM corrected complex random aberrations in the VLC scenario and improved the coupling efficiency of the signal beam, proving that the compact VCDM with high performance and low cost has a good application prospect in VLC systems.

The double-ring perfect optical vortex (DRPOV) beam offers more intensity patterns and controllable parameters than the traditional signal-ring perfect vortex. In this study, we investigate the bit error rate (BER) performance of a DRPOV beam in oceanic turbulence. A theoretical model for analysis is established based on the unstably stratified turbulence spectrum and quadrature amplitude modulation format. The results indicate that the two auto-focusing processes of DRPOV beam help to mitigate turbulence effects and improve BER performance over a wide propagation range. The auto-focusing behaviors are adjustable by double-ring structural parameters to adapt to different scenarios. In order to reduce BER, the increments of outer-ring intensity weight and overall beam size are preferred for long-range propagation, while the opposite sets are preferred for short distance. The position corresponding to the local BER minimum is controllable. In addition, the lower-order signal modulation with longer wavelength also achieves a lower BER. The research provides a reference for information transmission using vortex beams.