Infrared and Laser Engineering, Volume. 50, Issue 9, 20200445(2021)
Research and design of underwater wireless optical communication system with dual light sources
Figures & Tables(20)
Fig. 4. Schematic diagram of high-power LED signal modulation circuit
Table 1. Comparison table of performance parameters between traditional OOK modulation mode and improved OOK modulation mode
View tableView in ArticleTable 1. Comparison table of performance parameters between traditional OOK modulation mode and improved OOK modulation mode
Parameter TRAD_OOK IMP_OOK Average optical power ${ {P }_{ {\rm{MAX} } } }/2$ $({ {P }_{ {\rm{BIAS} } } } + { {P }_{ {\rm{MAX} } } })/2$ Bandwidth requirements R R Channel capacity $1/{\rm{\tau}} $ $1/{\rm{\tau}} $ Slot error rate $\dfrac{1}{2}\left\{ {1 - {\rm{erf} }\left(\dfrac{ {\sqrt { { {{P} }_{ {\rm{MAX} } } }/2{ {\rm{\sigma} } ^2} } } }{2}\right)} \right\}$ $\dfrac{1}{2}\left\{ {1 - {\rm{erf} }\left(\dfrac{ {\sqrt {({ { {P} }_{ {\rm{BIAS} } } } + { { {P} }_{ {\rm{MAX} } } })/(2{ {\rm{\sigma} } ^2)} } } }{2}\right)} \right\}$
Table 2. Wireless optical transmission characteristic parameters of underwater equipment
View tableView in ArticleTable 2. Wireless optical transmission characteristic parameters of underwater equipment
Parameter Value LED beam divergent half angle ${\rm{\gamma}} $ /(°)3.04 LD beam divergent half angle ${\rm{\gamma}} $ / (°)0.51 LED optical transmitting power ${{P}_{\rm{T}}}$ / dBm35.6 LD optical transmitting power ${{P}_{\rm{T}}}$ / dBm18 Transmission link off-axis angle ${\rm{\theta }}$ / (°)0 APD receiving area of photodetector ${ {S }_{\rm{R} } }$ /${\rm{m}}{{\rm{m}}^2}$ 19.6π PMT receiving area of photodetector ${ {S }_{\rm{R} } }$ /${\rm{m}}{{\rm{m}}^2}$ 156.25π Optical wavelength ${\lambda }$ /nm470
Table 3. Equipment performance parameter test
View tableView in ArticleTable 3. Equipment performance parameter test
Emission source Communication distance/m Communication rate/Mbps Receiving detector Theoretical received optical power value/dBm Actual received optical power/dBm LD 5 60 APD −10.09 −11.3 LD 10 60 APD −18.73 −18.5 LD 12 42 APD −21.35 −20.9 LED 20 18 APD −27.72 −28.2 LED 45 15 PMT −38.77 −38.6 LED 60 10 PMT −49.09 −53.2
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Hexi Liang, Tianhao Shen, Zhenya Wang, Cong Cao, Yun Xiao, Yong Ai. Research and design of underwater wireless optical communication system with dual light sources[J]. Infrared and Laser Engineering, 2021, 50(9): 20200445
Paper Information
Category: Optical communication and sensing
Received: Nov. 21, 2020
Accepted: --
Published Online: Oct. 28, 2021
The Author Email: Tianhao Shen (shentianhaosth@163.com)
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