Figure 10. Variation of the average BER as a function of the beam divergence angle θdiv at Ptx = 20 dBm An optimal θdiv value minimizes the BER, illustrating the trade-off between reducing scintillation and avoiding excessive coupling losses. The Sech profile provides the best overall performance.

From

Evaluation of Pulse Shapes on the Reception Performance of an FSO-WDM-PolSK System

Amadou Soumahoro, Douatia Koné, Aladji Kamagaté

International Journal of Physics. 2025, 13(4), 80-90 doi:10.12691/ijp-13-4-1