Visible light communication and lighting using laser diodes

The limitation of LED droop effect makes it difficult to realize high speed visible light communication. Therefore the laser diode as the light source of the visible light communication has attracted considerable interest in recent years. However, if we want to achieve visible light communication and high quality lighting applications, we also face some problems, such as strong directivity, high brightness, harm to the human eyes, not enough high bandwidth and so on. In this paper, we analyzed the factors that influence the bandwidth of the laser diode, proposed and simulated laser beam smoothing method and obtained good results.