Radial Angular Polarization Multiplexing and Wavefront Correction in Partially Coherent Vortex Optical Communication

Abstract The development of new optical field regulation is a key trend in free-space optical communication to expand channel capacity and mitigate the negative effects of atmospheric turbulence. A coherent detection model for a partially coherent vector vortex beam with 4-channel multiplexing under atmospheric turbulence transmission is constructed, and multiplexing transmission and wavefront correction of radially polarized partially coherent vortex signal light and angularly polarized partially coherent beacon light are performed. The impact of polarization crosstalk on wavefront correction performance and the correction effect on communication performance improvement are analysed. The results indicate that radial angular polarization multiplexing transmission can realize wavefront correction with a smaller relative power disturbance than the other distribution polarizations. A partially coherent vortex beam can suppress the fluctuation in the mixing efficiency with a certain degree of coherence. These results provide insights for subsequent research on fibre coupling and the application of partially coherent vortex beams in the field of free-space optical communication.