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
via Ferrara 54
47841
Cattolica (RN), Italy
Cell +39 349 1075999
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