[Laser] NLOS Optical Comms

[TWOSIG at aol.com]

I hope this is thinking outside of the box instead of thinking way off the 
mark:

It seems to me that if the intent is to provide non-line-of-sight 
communications, then we should be thinking in terms of scatter instead of transmission.  
I have been thinking in terms of LOS, so I use red.  If I wanted NLOS, the 
efficiency of the scatter would be one of the first things to consider.

If the sky is blue instead of pink because the blue light scatters better 
than red, should we look for light that is blue instead of red, or infra-red?

For that matter, does blue scatter so well in the upper atmosphere only?  My 
intuition says no, but maybe there is data.   I recall seeing a chart of 
frequencies where the atmosphere is transparent, but where it is "NOT" transparent, 
is it absorbtive (which would not help NLOS) or is it dispersive?

I hope this helps.

James
N5GUI