A reliable sunlight communication system
A sunlight communication system is proposed that uses Sr2Si5N8:Eu2+ phosphors to concentrate sunlight signals in strong background-light noise; thus, a wide spectrum sunlight communication system is converted into a narrow spectrum one. A communication method is proposed to enable compression to the dark line H-α (656.28 nm) spectrum. A 50% solar energy conversion efficiency is achieved, with a 0.3 μs code delay, a 0.2 μs code rise time (20%–80%), and a 96% optical transmittance. Experimental results show that phosphors enhance the sunlight intensity 1.5 times with the same distance. This method has immense potential in future long-distance sunlight communication.
作者单位：Academy of Opto-Electronics
Guo Haichao,Shan Tao,Li Li,Zhang Li,Li Xiaojun,Gao Han. A reliable sunlight communication system[J].Chinese Optics Letters,2019,17(12):12.