Fig. 1. Real-time optical intensity scintillation suppression model

Fig. 2. General flow chart of the algorithm

Fig. 3. Response curve of optical attenuator

Fig. 4. Fuzzy rule table for PID parameters. (a) $K_{\mathrm{P}}$ rule table; (b) $K_{\mathrm{I}}$ rule table; (c) $K_{\mathrm{D}}$ rule table; (d) membership degree function

Fig. 5. Experiment system of atmospheric optical transmission

Fig. 6. Turbulence attenuation signal collected at both ends of the link. (a) Reciprocity is 0.9964; (b) reciprocity is 0.9936

Fig. 7. Comparison of received light intensity before and after transmit power adaptive compensation. (a) Strongest optical intensity scintillation; (b) weakest optical intensity scintillation

Fig. 8. PDF of received optical signal before and after compensation. (a) Strongest optical intensity scintillation; (b) weakest optical intensity scintillation

Fig. 9. Comparison of received signal scintillation index before and after compensation