[Laser] pulsed laser comms

[F1AVYopto at aol.com]

Gleen

>The main advantage is that  pulsed lasers usually run a LOT more (peak) 
power output than a >CW laser.  Thus it's not so much a matter of processing 
sophistication by the receiver as  it >is  brute force by the transmitter.  The SNR 
is improved by  (say) 40dB simply because the >transmitter is sending 40dB 
more  power.
>If the comparison is between CW and pulsed lasers at the same peak  power 
level, then, >yeah, my guess is that superpositioning will not work as  well as 
an FFT, because the FFT >exploits signal coherence while  superpositioning 
doesn't.

I absolutely does not agree this point of  view.
In my last mail I compared between the peak power and the noise versus  the 
short time of the pulses.
In my example the peak power was 50000 times  more powerful than the 2 mW 
laser CWM laser.
At the same time the receiver to  receive the pulse at its peak power MUST to 
have a noise bandwidth 100000 times  more!
All the high power pulses gain is lost.
73 Yves F1AVY.