Perfect vortex beam propagation through jet engine turbulence considering incident mode.

When employing an airborne laser communication system in a drone swarm, it is inevitable that laser beams carrying information intersect with the airborne wake region during their propagation, and the laser may traverse jet engine turbulence at various angles and positions. Nevertheless, previous research in this area typically assumed that the laser beams would propagate perpendicular to the jet engine turbulence. To address this problem, we have established what we believe to be a novel turbulence model that takes incident modes into account. Initially, we derived the Fried parameter by incorporating both the incident angle and position, subsequently obtaining its analytical solution through integration. We then integrated the Fried parameter into the turbulence power spectrum and utilized phase screens to investigate and discuss jet engine turbulence considering the incident mode. In addition, we introduced a perfect vortex beam (PVB) into the airborne laser communication system and investigated the intensity distribution, orbital angular momentum spectrum, and bit error rate of PVB in jet engine turbulence considering incident mode. The numerical simulation results indicate that the perfect property of PVB significantly enhances the communication performance of airborne laser communication systems. The turbulence model that we established can provide more accurate reflections of real-world jet engine turbulence and offer valuable guidance in developing high-performance and high-capacity airborne laser communication systems, representing an essential step in this field.