Adaptive Optics Compensation for Orbital Angular Momentum Optical Wireless Communications
IEEE Transactions on Wireless Communications
Adaptive optics (AO) can efficiently compensate for turbulence-induced distortion in orbital angular momentum (OAM)-based optical wireless communication (OWC) systems. In this paper, we design a modified phase diversity algorithm (MPDA)-based wavefront sensor to enhance the reconstruction accuracy of distorted OAM wavefront information. Aiming to further strike a compelling trade-off between AO system complexity and compensation accuracy, we first construct a novel AO system that applies a quickly and electronically controlled focus-tunable lens (FTL). It decontaminates distorted OAM signaling beams while having a low systemic complexity and superior convergence performance. Furthermore, we propose the 3-modified phase diversity algorithm (3-MPDA) AO scheme relying upon a Fourier intensity and two defocused intensities as the prior information, which beneficially balances the compensation effect and the number of defocused intensities and exhibits good noise robustness against charge-coupled device (CCD) detectors. In summary, this paper provides new insight for designing AO schemes with high compensation performance in communication links.
adaptive optics (AO), Optical wireless communication (OWC), orbital angular momentum (OAM), phase diversity algorithm (PDA)
H. Chang et al., "Adaptive Optics Compensation for Orbital Angular Momentum Optical Wireless Communications," in IEEE Transactions on Wireless Communications, vol. 21, no. 12, pp. 11151-11163, Dec. 2022, doi: 10.1109/TWC.2022.3190329.