Fig. 1. The structure of the proposed UWOC-MIMO system

Fig. 2. Green LED. (a) structure of LED array; (b) EL spectra

Fig. 3. PMT of receiver. (a) Appearance of PMT; (b) Structure of PMTs array

Fig. 4. Circuit configuration of AGC

Fig. 5. Indoor water tank. (a) Tank length 10 m, optical glass with a diameter of 300 mm; (b) Water injection

Fig. 6. Underwater channel received optical power distribution MATLAB simulation. (a) Formation of point lamp; (b) Non-point lamp

Fig. 7. Optical signal through the underwater channel

Fig. 8. PMT test waveform. (a) Anode output voltage and cathode output current ;(b) Radiation power and cathode output current

Fig. 9. Relationship between channel capacity and SNR