![]() However, adaptive optics can effectively improve the effects of atmospheric turbulence or scattering and increase the speed of communication systems. Increasing the gain of the signal at this point does not necessarily improve the quality of the laser beam. Various vortex superpositions produce atmospheric turbulence, which greatly reduces the communication distance of free-space optical communication and damages the free-space optical communication link between the satellite and the ground, resulting in the attenuation of laser signals. ![]() In the application of a free-space optical communication system, the atmospheric turbulence effect is an important problem to consider, due to the changes in wind speed, the unevenness of the sun’s radiation energy on the ground and other factors which cause local atmospheric density changes and produce vortexes in the atmosphere. Therefore, the research on free-space optical communication networking technology has important research significance for the wider use of optical communication. Realizing data and information transfer of free-space optical communication and information transmission of one-to-many and many-to-many communication devices is a necessary condition for the application of free-space optical communication technology. Therefore, laser communication technology has broad application prospects in the field of wireless communication. At the same time, it has the advantages of large transmission capacity, long transmission distance, good confidentiality, and strong anti-interference ability. Compared with traditional wireless communication, laser communication does not require complex antennas and frequency applications. ![]() Therefore, laser communication technology is not widely used in life at present. This greatly increases the difficulty of using laser communication technology in cities and in vehicle-mounted lidars. At the same time, point-to-point laser communication cannot complete point-to-multipoint reception. During laser communication, the laser transmitting end and the receiving end need to be aligned with high accuracy, and there should be no obstacles blocking the optical path between the two ends otherwise, data transmission will fail. Space laser communication facilitates the exchange of information between two devices without any connection relationship in free-space. At present, laser communication technology has been studied in the fields of lidar, the military, and underwater communication. With the development and progress of science and technology, space laser communication technology has gradually expanded from satellites to the ground. This system provides the design prototype system of FSO communication networking technology. ![]() Additionally, using ADC to demodulate the received signal increases the stability of the free-space optical communication system. The experimental results show that the constructed system can achieve point-to-multipoint free-space optical communication. The relay system analyzes the routing target after receiving the pulse signal from the transmitter, and then sends the data to the target receiver. The binary data bits in the communication process are converted into pulse signals of different widths, the data demodulation process is realized by sampling with a high-speed analog-to-digital converter (ADC), the data level is determined by counting the proportion of high and low voltages sampled in a pulse period. An optical communication relay system is constructed to realize communication networking. The process of signal modulation and demodulation is implemented by means of a field programmable gate array (FPGA). In this paper, pulse width modulation (PWM) is used to realize free-space optical communication. Optical communication modulation technology and networking technology are two important technologies for constructing free-space optical (FSO) communication.
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