基于电场蒙特卡罗法的轨道角动量光束在水下散射信道中的传输特性分析

aking OAM beam as the research object, the propagation characteristics of photons are studied based on Mie scattering theory. Combined with electric field Monte Carlo theory, the variation relationship of electric field before and after photon scattering is given. The received light intensity, detection probability, beam mode crosstalk of Laguerre Gaussian beam and Bessel Gaussian beam passing through different scattering channels are analyzed. The topological charge of OAM beam, particle size and refractive index of dielectric particles, attenuation distance are all factors affecting the propagation characteristics. The simulation results show that after OAM beam is transmitted through the scattering channel, the received light intensity decreases with the increase of transmission distance, and the phase distortion of OAM beam will become more and more serious. The detection probability of OAM beam decreases and the degree of mode crosstalk increases. The theoretical method and simulation results have certain guiding significance for studying the propagation characteristics of OAM beam in underwater channel.