Prof. Xuan Tang
Haixi Institutes Chinese Academy of Sciences, China

About: Xuan Tang is an academic leader and Professor at Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences (CAS) since Oct. 2014. She is a team member of Youth Innovation Promotion Association CAS. Her research interests are in the areas of optical wireless communication systems including high speed infrared/ultraviolet laser communications, visible light communications and optical MIMO systems, as well as radio frequency communication technologies. She was awarded BEng in Electronic and Communications Engineering and PhD on Polarisation Shift Keying Modulated Free-Space Optical Communication Systems in 2008 and 2012 from Northumbria University, UK, respectively. From Oct. 2012 to July 2014, she worked as the Postdoctoral Researcher at the Department of Electronic Communications Engineering, Tsinghua University. She is the leader for over 10 projects, including Scientific Research Instrument and Equipment CAS, Bureau of International Cooperation CAS, National Natural Science Foundation of China, Returned Overseas Chinese Scholars of the State Education Ministry, several projects collaborated with industries and so on. She has over 70 publications.

Title: Free-Space Optical Communications: Modeling and Performance Evaluation

Abstract: The data transmission rate, range, and reliability of free-space optical communication (FSO) systems are affected by a number of atmospheric phenomena, such as rain, haze, fog, snow, and scintillation. Thick fog with over 300 dB/km of attenuation limits the link length to around 100 m. Even under clear air conditions with no atmospheric scattering, the FSO communication link still suffers from fading due to scintillation. Scintillation fade margins are 2 to 5 dB for FSO links of 500 metres or less, which is well below margins for the atmospheric attenuation. For the link range beyond 1 km, scintillation may severely impact the performance of FSO links, thus resulting in the link deterioration, i.e., higher outage probability and ultimately complete link failure. In this presentation the performance of terrestrial FSO system under various channel conditions, such as fog, sandstorm, and turbulence, will be investigated and analysed. The results are theoretically and experimentally compared with the existing channel models.