[Laser] MFSK for Light?

[TWOSIG at aol.com]

Yves
 
Sorry to be slow to get back to you.  Thank you for your  feedback.  I found 
some information on JASON, but I do not understand much  of it.  I will keep 
trying.
 
I am wondering about your experience with laser comm and JASON.  Was  the 
light modulated with sine waves, that is, linearly?  Or were the  frequency tones 
square waves, that is, turning the laser fully on or off?
 
If the modulation was linear, what was the percent of modulation?
 
If you were using square waves, was the computer output sine waves?   And if 
so, how did you convert the sine wave computer output into square waves  of 
light?
 
Best Wishes.
 
James
N5GUI
 
 
In a message dated 8/3/2006 5:36:20 AM Central Standard Time,  
F1AVYopto at aol.com writes:

Greetings All, 
The best  laser com protocol I used was JASON  from I2PHD. 
The new  version with high speed and turbo mode gives a  good speed / 
sensitivity  ratio. 
The slow mode  allows - 38  dB under noise. 
73  Yves