A reliable sunlight communication system

Haichao Guo; Tao Shan; Li Li; Li Zhang; Xiaojun Li; Han Gao

doi:10.3788/COL201917.120605

Journals >Chinese Optics Letters >Volume 17 >Issue 12 >Page 120605 > Article

Chinese Optics Letters
Vol. 17, Issue 12, 120605 (2019)

A reliable sunlight communication system

Haichao Guo^1、2、3, Tao Shan^1、*, Li Li³, Li Zhang³, Xiaojun Li³, and Han Gao⁴

Author Affiliations

¹School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China

²National Key Laboratory of Science and Technology on Space Microwave, Xi’an 710100, China

³China Academy of Space Technology (Xi’an), Xi’an 710100, China

⁴Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China

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DOI: 10.3788/COL201917.120605 Cite this Article Set citation alerts

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 Copy Citation Text

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Fig. 1. Basic composition of sunlight communication system.

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Fig. 2. Experimental setup for LED communication.

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Fig. 3. Experimental setup for sunlight communication system.

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Fig. 4. Signal eye diagram (a) without phosphors and (b) with phosphors.

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Fig. 5. Measured sunlight intensity values.

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Fig. 6. Sunlight communication experiment and composition.

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Fig. 7. Change in the SNR with respect to increasing distance.

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Experiment	With Phosphors (μs)	Without Phosphors (μs)	Results (μs)
Delta delay	6.0	5.7	0.3
Rising edge (20%–80%)	1.3	1.1	0.2

Table 1. Communication Delay Time and Time Edge Measurement

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Parameter		Ordinary Comm.	Spectral-Regulated Comm.
Compound parabolic concentrator aperture	$D_{0}$	200 mm	200 mm
Loss of gathering and transmission channel	$ρ_{F}$	0.4	0.4
Transmission divergence angle	$θ_{T}$	10 mrad	0.2 mrad
Transmission power	$P_{T}$	10 W	0.8 W
Loss of receiving channel	$ρ_{S}$	0.3	0.3
Transmitting antenna aperture	$D_{T}$	300 mm	300 mm
Communication bandwidth	$B$	10 MHz	10 MHz
Receiving field of view	$θ_{R}$	10 mrad	10 mrad
Communication wavelength	$λ$	400 nm–700 nm	655 ± 5 nm
Receiving antenna aperture	$D_{R}$	300 mm	300 mm
Maximum photodetector response	$R$	0.6	0.6
Background total brightness	$L_{0}$	$100 {W / m}^{2} \cdot gsr$	$100 {W / m}^{2} \cdot gsr$
Power of receiving background light	$P_{Be}$	$1.11 \times 10^{- 5}$	$3.4 \times 10^{- 7}$
Communication distance	$L_{1}$	210 km	210 km
Signal to noise ratio	$SNR$	3.15 dB	64.19 dB

Table 2. Comparison of Ordinary Communication and Spectral Regulated 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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