Design of Adaptive Light Intensity Detection Circuit for Underwater Optical Communication Based on Direct-Curren-Biased Optical Orthogonal Frequency Division Multiplexing

Xiuyun Ren; Xiuna Li; Yanchao Zhang; Zhihua Zhang; Chensui Ouyang; Zifan Tang

doi:10.3788/AOS230622

Acta Optica Sinica, Volume. 43, Issue 24, 2406002(2023)

Design of Adaptive Light Intensity Detection Circuit for Underwater Optical Communication Based on Direct-Curren-Biased Optical Orthogonal Frequency Division Multiplexing

Xiuyun Ren, Xiuna Li, Yanchao Zhang^*, Zhihua Zhang, Chensui Ouyang, and Zifan Tang

Author Affiliations

School of Information Science and Engineering, Harbin Institute of Technology, Weihai, Weihai 264209, Shandong , China

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Abstract Get PDF(in Chinese)

Figures & Tables(20)

Fig. 1. OFDM signals in ethernet communications

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Fig. 2. Schematic diagram of adaptive light intensity detection circuit based on DCO-OFDM

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Fig. 3. Adaptive light intensity detection circuit diagram

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Fig. 4. Experimental setup of laser communication system

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Fig. 5. Experimental equipments of laser communication systems. (a) Transmitter; (b) receiver

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Fig. 6. Laser communication experimental setup for underwater channels

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Fig. 7. DC signal, input AC signal relationship fitting diagram

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Fig. 8. Adaptive light intensity detection circuit output signals when signal strength changes. (a) DC signal is 300 mV; (b) DC signal is 500 mV

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Fig. 9. Fitting curves of DC signal-gain control input signal data

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Fig. 10. Variation curves of circuit amplification with input signal

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Fig. 11. Variation curves of AGC circuit output signal with light intensity

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Fig. 12. Detector DC current versus receiving angle. (a) 450 nm LD; (b) 520 nm LD

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Fig. 13. Laser communication system at a communication distance of 20 cm

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Fig. 14. Transmission rate measured at a communication distance of 6 m

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Table 1. Light intensity at the receiving end
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Table 1. Light intensity at the receiving end
Short-circuit current /μA 23.0 31.0 40.0 56.0 59.4 60.2 69.0 70.0 71.5 81.4
Illumination /lx 115.0 155.0 200.0 280.0 297.0 301.0 345.0 350.0 357.5 407.0

Table 2. Test data of DC signal and input AC signal
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Table 2. Test data of DC signal and input AC signal
DC voltage V_DC/mV 0 110 220 246 350 570 620 720 790 820
AC signal peak-to-peak value V_i/mV 0 32 50 55 72 120 125 155 168 175

Table 3. Light intensity adaptive circuit test data for air channel

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Table 3. Light intensity adaptive circuit test data for air channel

DC voltage V_DC/mV	110	220	246	350	570	620	720	790
Logarithmic amplifier circuit output voltage $V_{o 4}$ /V	5.91	5.76	5.74	5.67	5.57	5.55	5.52	5.50
Transimpedance amplifier output AC signal （peak-to-peak） V_i/mV	32	50	55	72	120	130	165	175
AC output signal （peak-to-peak） V_o/mV	600	580	600	620	600	590	600	600

Table 4. Theoretical analysis and actual control signal data of the circuit
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Table 4. Theoretical analysis and actual control signal data of the circuit
DC voltage V_DC/mV 110 220 246 350 570 620 720 790
Logarithmic amplifier circuit output $V_{o 4}$ /V 5.91 5.76 5.74 5.67 5.57 5.55 5.52 5.50
Theoretical value V₁/V 5.86 5.76 5.74 5.68 5.57 5.55 5.51 5.49

Table 5. Comparison of actual gain and ideal gain performance of the circuit
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Table 5. Comparison of actual gain and ideal gain performance of the circuit
Actual gain 18.13 11.60 10.91 8.61 5.00
Ideal gain 18.75 12.00 10.91 8.33 5.00
Error 0.62 0.40 0 -0.28 0

Table 6. Light intensity adaptive circuit test data for underwater channel

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Table 6. Light intensity adaptive circuit test data for underwater channel

DC voltage V_DC/mV	356	441	480	593	620	660	759	828	890
Logarithmic amplifier circuit output voltage $V_{o 4}$ /V	5.52	5.47	5.45	5.40	5.39	5.38	5.35	5.33	5.32
Transimpedance amplified output AC signal （peak-to-peak） V_i/mV	200	230	220	300	300	310	370	400	410
AC output signal （peak-to-peak） V_o /mV	620	600	610	600	610	620	600	610	600

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Xiuyun Ren, Xiuna Li, Yanchao Zhang, Zhihua Zhang, Chensui Ouyang, Zifan Tang. Design of Adaptive Light Intensity Detection Circuit for Underwater Optical Communication Based on Direct-Curren-Biased Optical Orthogonal Frequency Division Multiplexing[J]. Acta Optica Sinica, 2023, 43(24): 2406002

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