[time-nuts] Using lasers for data transmission

[Ilia Platone]

The problem would be modulating a 10GBASE-T signals into a single laser 
beam, and demodulating it using (I think) an APD.

except the one depending on light travel, that shouldn't be a problem if 
using White Rabbit, there could be some problem with the modulating and 
transmitter/receiver delay response times.

I mean that lasers offer 100ps rise time, and the APDs I found offer 5ps 
rise time, these must be multiplied by all the wires that GigE needs, 
which should be 4 pairs if I remember correctly, and some are 
bi-directional, plus the modulation process.

Ilia.


Il 01/05/2016 07:13, Perry Sandeen via time-nuts ha scritto:
> Hi,
> Several (many?) years ago National Geographic magazine show a picture taken here in southern California of the state government sending red laser signals between different mountain tops to keep track what was going on near fault lines.
> There were no technical details on what was taking place.  So it can be done.
> At a hamfest a few years ago I bought both a red and green 35 mW laser pen for about $15 each.  They do shine a long, long way.  Whether these are powerful enough, or can be properly modulated for what is needed, I have no idea.
> On line I saw at least one China site that had much larger outputs available.  The prices were modest. FWIW.
> Regards,
> Perrier
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Ilia Platone
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