Novel self-focusing vortex light beam generation method for inhibiting turbulence effect

Abstract

The invention discloses a novel self-focusing vortex light beam generation method for inhibiting a turbulence effect. The problems of light beam expansion and wavefront phase distortion caused when vortex light beams are propagated in turbulent media are mainly solved. According to the scheme, the method comprises the steps of 1) detecting a channel signal-to-noise ratio [gamma] according to a channel environment; 2) comparing the signal-to-noise ratio [gamma] of the current channel with a threshold value [eta], if [gamma] is greater than or equal to [eta], executing the step 3), otherwise, executing the step 4); 3) generating a sustainable self-focusing needle-shaped single vortex light beam; 4) generating a high-power array needle-shaped vortex light beam with the focusing position beingadjustable and controllable; and 5) loading a filter factor to the obtained vortex beam by using a spatial filter, and filtering out the aliasing mode in the beam to obtain the novel self-focusing vortex light beam required by the system. According to the invention, the novel self-focusing vortex light beam required by the system is selected according to the channel environment under different conditions by considering the transmitting end of the system, so that the effectiveness and reliability of the orbital angular momentum FSO communication system are improved, and the method can be applied to the communication system taking turbulence as a medium.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a method for generating a self-focusing vortex beam, which can be used to generate a vortex beam for improving FSO communication performance at a transmitting end in a communication system using turbulence as a medium. Background technique [0002] In recent years, with the continuous deepening of informatization, the rapid development of mobile communication services and Internet technology has greatly increased the demand for communication effectiveness and reliability. At present, the multiplexing methods commonly used in the communication field include: time division, space division, frequency division and code division multiplexing. Although these technical methods can alleviate the contradiction between channel capacity and user demand, with the further development of user demand for information bandwidth and data rate, a new technology that can further im...

AI Technical Summary

Problems solved by technology

However, these two methods do not consider how to control the focus position of the array beam and filter out the aliasing mode, which leads to the inability to obtain the best received signal at the receiving end of the system when determining a transmission distance, thus failing to further improve the system effectiveness and reliability

Images