Chinese Optics Letters, 2019, 17 (12): 120605, Published Online: Dec. 5, 2019  

A reliable sunlight communication system Download: 633次

Author Affiliations
1 School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China
2 National Key Laboratory of Science and Technology on Space Microwave, Xi’an 710100, China
3 China Academy of Space Technology (Xi’an), Xi’an 710100, China
4 Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China
Abstract
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.

Haichao Guo, Tao Shan, Li Li, Li Zhang, Xiaojun Li, Han Gao. A reliable sunlight communication system[J]. Chinese Optics Letters, 2019, 17(12): 120605.

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