A reliable sunlight communication system

Table 1. Communication Delay Time and Time Edge Measurement
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Table 1. Communication Delay Time and Time Edge Measurement
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 2. Comparison of Ordinary Communication and Spectral Regulated Communication

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Table 2. Comparison of Ordinary Communication and Spectral Regulated Communication

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

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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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