Research and design of underwater wireless optical communication system with dual light sources

Hexi Liang; Tianhao Shen; Zhenya Wang; Cong Cao; Yun Xiao; Yong Ai

doi:10.3788/IRLA20200445

Journals >Infrared and Laser Engineering >Volume 50 >Issue 9 >Page 20200445 > Article

Infrared and Laser Engineering
Vol. 50, Issue 9, 20200445 (2021)

Research and design of underwater wireless optical communication system with dual light sources

Hexi Liang¹, Tianhao Shen^1、*, Zhenya Wang^2、5, Cong Cao^2、5, Yun Xiao³, and Yong Ai^4、5

Author Affiliations

¹Hubei Normal University, Huangshi 435002, China

²School of Electronic and Electrical Engineering, Wuhan Textile University, Wuhan 430200, China

³Wuhan Marine Communication Institute, Wuhan 430205, China

⁴Electronic Information School, Wuhan University, Wuhan 430072, China

⁵Wuhan Liubo Photoelectric Technology Co. LTD, Wuhan 430000, China

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DOI: 10.3788/IRLA20200445 Cite this Article

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 Copy Citation Text

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Fig. 1. Overall structure diagram of the system

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Fig. 2. LED digital modulation characteristic curve

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Fig. 3. Improved circuit model diagram

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Fig. 4. Schematic diagram of high-power LED signal modulation circuit

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Fig. 5. Measured value of the current flow through the LED

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Fig. 6. 5 MHz waveform of APD receiving communication bandwidth

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Fig. 7. Schematic diagram of the receiving end of the system

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Fig. 8. APD detector 45 MHz test output signal

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Fig. 9. PMT detector 45 MHz test output signal

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Fig. 10. FPGA control core block diagram

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Fig. 11. FPGA control unit encoding and decoding data flow

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Fig. 12. Underwater optical communication link model

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Fig. 13. Engineering prototype

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Fig. 14. Underwater experiment test scenario

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Fig. 15. Simulating underwater test experiment

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Fig. 16. Bit error rate performance test of equipment

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Fig. 17. Upper computer display transceiver data diagram

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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 1. Comparison table of performance parameters between traditional OOK modulation mode and improved OOK modulation mode

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Parameter	Value
LED beam divergent half angle ${\rm{\gamma}} $/(°)	3.04
LD beam divergent half angle ${\rm{\gamma}} $/ (°)	0.51
LED optical transmitting power ${{P}_{\rm{T}}}$/ dBm	35.6
LD optical transmitting power ${{P}_{\rm{T}}}$/ dBm	18
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 ${\lambda }$/nm	470

Table 2. Wireless optical transmission characteristic parameters of underwater equipment

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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

Table 3. Equipment performance parameter test

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