1. Date of download: 7/6/2016 Copyright © 2016 SPIE. All rights reserved. Transmittance profile of a 45-deg slanted FSO communications link showing the available transmission windows. Figure Legend: From: Free-space optical wavelength diversity scheme for fog mitigation in a ground-to- unmanned-aerial-vehicle communications link Opt. Eng. 2006;45(8):086001-086001-12. doi:10.1117/1.2338565

2. Date of download: 7/6/2016 Copyright © 2016 SPIE. All rights reserved. Schematic view of bidirectional ground-to-UAV FSO communications link. Figure Legend: From: Free-space optical wavelength diversity scheme for fog mitigation in a ground-to- unmanned-aerial-vehicle communications link Opt. Eng. 2006;45(8):086001-086001-12. doi:10.1117/1.2338565

3. Date of download: 7/6/2016 Copyright © 2016 SPIE. All rights reserved. UAV flight configuration. Figure Legend: From: Free-space optical wavelength diversity scheme for fog mitigation in a ground-to- unmanned-aerial-vehicle communications link Opt. Eng. 2006;45(8):086001-086001-12. doi:10.1117/1.2338565

4. Date of download: 7/6/2016 Copyright © 2016 SPIE. All rights reserved. Schematic to determine Gaussian beam diameter at the receiver. Figure Legend: From: Free-space optical wavelength diversity scheme for fog mitigation in a ground-to- unmanned-aerial-vehicle communications link Opt. Eng. 2006;45(8):086001-086001-12. doi:10.1117/1.2338565

5. Date of download: 7/6/2016 Copyright © 2016 SPIE. All rights reserved. Receiver plane beam profiles for a 0.85-μm wavelength at (a) a 4-km UAV altitude and (b) an 8-km altitude. Figure Legend: From: Free-space optical wavelength diversity scheme for fog mitigation in a ground-to- unmanned-aerial-vehicle communications link Opt. Eng. 2006;45(8):086001-086001-12. doi:10.1117/1.2338565

6. Date of download: 7/6/2016 Copyright © 2016 SPIE. All rights reserved. Receiver plane beam profiles for a 1.55-μm wavelength at (a) a 4-km UAV altitude and (b) an 8-km altitude. Figure Legend: From: Free-space optical wavelength diversity scheme for fog mitigation in a ground-to- unmanned-aerial-vehicle communications link Opt. Eng. 2006;45(8):086001-086001-12. doi:10.1117/1.2338565

7. Date of download: 7/6/2016 Copyright © 2016 SPIE. All rights reserved. Receiver plane beam profiles for a 10-μm wavelength at (a) a 4-km UAV altitude and (b) an 8-km altitude. Figure Legend: From: Free-space optical wavelength diversity scheme for fog mitigation in a ground-to- unmanned-aerial-vehicle communications link Opt. Eng. 2006;45(8):086001-086001-12. doi:10.1117/1.2338565

8. Date of download: 7/6/2016 Copyright © 2016 SPIE. All rights reserved. Uplink transmittance as a function of wavelength for a 4-km UAV altitude in the presence of radiation fog. Figure Legend: From: Free-space optical wavelength diversity scheme for fog mitigation in a ground-to- unmanned-aerial-vehicle communications link Opt. Eng. 2006;45(8):086001-086001-12. doi:10.1117/1.2338565

9. Date of download: 7/6/2016 Copyright © 2016 SPIE. All rights reserved. Uplink transmittance as a function of UAV altitude in the presence of radiation fog. Figure Legend: From: Free-space optical wavelength diversity scheme for fog mitigation in a ground-to- unmanned-aerial-vehicle communications link Opt. Eng. 2006;45(8):086001-086001-12. doi:10.1117/1.2338565

10. Date of download: 7/6/2016 Copyright © 2016 SPIE. All rights reserved. Received power as a function of UAV altitude for an FSO uplink in the presence of radiation fog. Figure Legend: From: Free-space optical wavelength diversity scheme for fog mitigation in a ground-to- unmanned-aerial-vehicle communications link Opt. Eng. 2006;45(8):086001-086001-12. doi:10.1117/1.2338565

11. Date of download: 7/6/2016 Copyright © 2016 SPIE. All rights reserved. Downlink transmittance as a function of altitude above the ground station in the presence of radiation fog with a UAV altitude of 4km. Figure Legend: From: Free-space optical wavelength diversity scheme for fog mitigation in a ground-to- unmanned-aerial-vehicle communications link Opt. Eng. 2006;45(8):086001-086001-12. doi:10.1117/1.2338565

12. Date of download: 7/6/2016 Copyright © 2016 SPIE. All rights reserved. Downlink received power as a function of altitude above the ground station in the presence of radiation fog with a 4-km UAV altitude. Figure Legend: From: Free-space optical wavelength diversity scheme for fog mitigation in a ground-to- unmanned-aerial-vehicle communications link Opt. Eng. 2006;45(8):086001-086001-12. doi:10.1117/1.2338565

13. Date of download: 7/6/2016 Copyright © 2016 SPIE. All rights reserved. Uplink transmittance as a function of wavelength for an 8-km UAV altitude in the presence of radiation fog. Figure Legend: From: Free-space optical wavelength diversity scheme for fog mitigation in a ground-to- unmanned-aerial-vehicle communications link Opt. Eng. 2006;45(8):086001-086001-12. doi:10.1117/1.2338565

14. Date of download: 7/6/2016 Copyright © 2016 SPIE. All rights reserved. Uplink transmittance as a function of UAV altitude in the presence of radiation fog. Figure Legend: From: Free-space optical wavelength diversity scheme for fog mitigation in a ground-to- unmanned-aerial-vehicle communications link Opt. Eng. 2006;45(8):086001-086001-12. doi:10.1117/1.2338565

15. Date of download: 7/6/2016 Copyright © 2016 SPIE. All rights reserved. Received power as a function of UAV altitude for an FSO uplink in the presence of radiation fog. Figure Legend: From: Free-space optical wavelength diversity scheme for fog mitigation in a ground-to- unmanned-aerial-vehicle communications link Opt. Eng. 2006;45(8):086001-086001-12. doi:10.1117/1.2338565

16. Date of download: 7/6/2016 Copyright © 2016 SPIE. All rights reserved. Downlink transmittance as a function of altitude above the ground station in the presence of radiation fog with a UAV altitude of 8km. Figure Legend: From: Free-space optical wavelength diversity scheme for fog mitigation in a ground-to- unmanned-aerial-vehicle communications link Opt. Eng. 2006;45(8):086001-086001-12. doi:10.1117/1.2338565

17. Date of download: 7/6/2016 Copyright © 2016 SPIE. All rights reserved. Downlink received power as a function of altitude above the ground station in the presence of radiation fog with an 8-km UAV altitude. Figure Legend: From: Free-space optical wavelength diversity scheme for fog mitigation in a ground-to- unmanned-aerial-vehicle communications link Opt. Eng. 2006;45(8):086001-086001-12. doi:10.1117/1.2338565