Fig. 1. Board-to-backplane server interconnection links in the presence of crosstalk and turbulence inducing signal interference and fades.

Fig. 2. Schematic diagram of experimental setup of FSO links for board-to-backplane server interconnections in the presence of air turbulence. Laser1 is on and Laser2 is off; some of the irradiance from Laser1 crosses over to photodiode PD2. The curved lines represent the airflow current from the blow heater.

Fig. 3. Photograph of the experimental setup: (A) signal generator, (B) laser-diodes, (C) analog-to-digital (A/D) converter, (D) computer chassis, (E) anemometer, (F) photodiodes, and (G) blow-heater.

Fig. 4. Temperature inside the chassis as a function of the distance of the blow heater from the optical axis.

Fig. 5. Wind velocity as a function of the distance of the blow heater from the optical axis.

Fig. 6. Lognormal PDF; crosstalk amplitude measurements and fit for two different distances of the blow heater from the optical axis.

Fig. 7. Measured scintillation indices of on-axis channel σI,l and off-axis crosstalk σI at different distances of the blow heater from the optical axis.

Fig. 8. Measured radial term of scintillation index σI,r at different distances of the blow heater from the optical axis.

Fig. 9. Auto-covariance of crosstalk noise at a 30 cm distance of the blow heater from the optical axis.

Fig. 10. Auto-covariance of crosstalk noise at an 80 cm distance of the blow heater from the optical axis.

Fig. 11. Normalized cross-covariance between the on-axis and crosstalk components at three different distances of the blow heater from the optical axis: 30, 50, and 80 cm.