Design of a high-speed data transmission link using free-space optics communication technology for metropolitan information networks

Tóm tắt

This paper presents a process of design and simulation of a high-speed data transmission link using free-space optical communication (FSO) technology which is suitable for metropolitan information network applications. Based on technical requirements of data speed and transmission distance, the key system components will be designed and configured with appropriate parameters. Important quality criteria such as quality factor (Q) and bit error rate (BER) will be evaluated and selected through the process of simulating and analyzing system performance. In particular, the investigation results show that a large antenna aperture diameter could significantly improve the signal reception and enhances the quality factor Q, minimizing BER. At the same time, a narrower beam divergence of the transmitting antenna helps to better concentrate the energy, limit the loss due to scattering and turbulence in the transmission environment. However, these two parameters need to be carefully considered and selected because they are also related to the physical size of the device and the cost of the system which are important factors affecting the feasibility of the system when deployed in practice. In addition, other factors such as cut-off frequency of the receiving power filter, visibility index of the environment and transmission power level affect the signal quality, significantly contributing to the design of the entire FSO system.