Fig. 1. UOWC optical signal transmission model

Fig. 2. Bistable stochastic resonance potential function

Fig. 3. Effect of parameter a，b on the potential function U（x）

Fig. 4. Effect of parameter a，b on the system threshold A_c

Fig. 5. Secondary sampling stochastic resonance

Fig. 6. Large parameter signal stochastic resonance

Fig. 7. Bipolar signal with Gaussian white noise processed by CFACA-ASR system（SNR=-20 dB）

Fig. 8. ACA algorithm convergence graph

Fig. 9. CFACA algorithm convergence graph

Fig. 10. Bit error rate of different detection schemes

Fig. 11. CFACA-ASR error rate under different sampling points

Fig. 12. UOWC experimental system

Fig. 13. Experimental data collected based on CFACA-ASR system processing（SNR=-4.559 5 dB）

Fig. 14. Experimental results of different detection schemes