Optimization of wireless optical communication using perfect vortex beam

Abstract

The current perfect vortex beam (PVB) is a novel type of vortex beam that is produced by modulating Bessel–Gaussian beam (BGB) and exhibits intensity distribution structures virtually unaffected by orbital angular momentum (OAM). Compared to an ideal PVB, an PVB based on BGB modulation can only realize a stable intensity structure within a limited range. The stable intensity structure allows higher-order PVB to exhibit better anti-diffraction ability than higher-order BGB, enhancing PVB’ received probability over BGB throughout the communication process when m0=10. The PVB exhibit the self-focusing effect and are influenced by OAM once the limited range is exceeded. The self-focusing effect aids in improving the communication quality of low-order PVB beyond that of BGB during the self-focusing stage. In stronger turbulent, the self-focusing effect exhibits a superior capability to restore PVB’s transmission performance. As the order of OAM modes multiplexing increases, the gap in channel capacity between PVB and BGB during the anti-diffraction stage gradually reduces.