[Ronja] Channel Capacity

Gullik Webjorn gullik.webjorn at flysta.net
Mon Oct 22 10:47:04 BST 2007


Clock,

How do we design optical heterodyne Ronja?

Then we might actually go somewhere towards the 77,000 Ghz :-)

Gullik

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Fran: ronja-bounces+gullik.webjorn=flysta.net at lists.pointless.net
[mailto:ronja-bounces+gullik.webjorn=flysta.net at lists.pointless.net]For
Karel Kulhavy
Skickat: den 22 oktober 2007 11:05
Till: Twibright Ronja
Amne: Re: [Ronja] Channel Capacity


On Sun, Oct 21, 2007 at 05:24:00PM +0200, Jakub Ladman wrote:
> Dne Friday 19 October 2007 19:32:37 Karel Kulhavy napsal(a):
> > On Fri, Oct 19, 2007 at 10:38:56AM +0200, Daniel Polak wrote:
> > > Whats the theoretical channel capacity from Ronja Tetrapolis
calculated
> > > with the shannon-hartley theorem? I tried to calculate it but I'm not
> > > sure about the bandwidth. What's the bandwidth in hertz?
> >
> > I don't know. What I know for sure it's constantly changing with clouds
> > passing over the landscape, fog, day/night etc. The bandwidth is about
> > 100nm which is 77,000 GHz.
>
> Bandwidth of ronja circuits 77GHz? This is absolute nonsense.
> I have not calculated it, but i estimate it about 50MHz

The transmission bandwidth is like this due to spectral width of the LED
diode.
It's an electromagnetic signal at 480,000 GHz, 77,000 GHz wide ;-) Then it
is
demodulated like envelope detected on the photodiode. The electronics
bandwidth
is aimed at 16MHz.

But I don't know if Shannon theorem takes quantum effects into the account.
On
this frequency they are already strong.

CL<

>
> Jakub Ladman
>
> >
> > CL<
> >
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