Abstract:

In order to study the distribution and loss characteristics of the cross-media uplink laser during transmission, the existing laser transmission model is improved based on the Monte Carlo method. Assuming that the underwater laser source is a collection of photons and that the light intensity obeys the Gaussian distribution, by tracking the transmission process of a large number of photons, statistical results are obtained to analyze the effects of the wind speed and underwater transmission distance on the photon distribution and weight on the receiving surface. Results show that when the sea surface wind speed is constant, the underwater transmission distance is larger, and the photon distribution is more divergent, with the weight of the center location sharply decreasing. When the underwater transmission distance is constant, the lower wind speed on the sea surface has a little effect on the photon distribution. As the wind speed increases, the trend of divergence is obvious for the photon distribution. Therefore, both a large wind speed on the sea surface and a long distance of underwater transmission have a great influence on the laser transmission across the media.

Key words: laser communication, Monte Carlo methods, transmission characteristics, cross-media