[time-nuts] ngTADD-1
Kevin Rosenberg
kevin at rosenberg.net
Fri Apr 26 16:32:45 UTC 2013
Thanks to all for the very helpful discussion.
Appreciatively, Kevin
On Apr 25, 2013, at 9:26 AM, Chris Albertson <albertson.chris at gmail.com> wrote:
> The problem with analog 10MHz is the non-linear parts at each end of
> the fiber optic. It would be hard to get a nice sine wave at the
> output.
>
> I think if you have a requirement for very clean sine wave at the far
> end you'd best try to phase lock a local XO. Send a 10 MHz square
> wave down the fiber and use that to phase lock a local XO. I think
> almost all fiber systems use a PLL for clock recovery.
>
> Problem is the parts built into the jacks.
>
> On Thu, Apr 25, 2013 at 12:08 AM, Attila Kinali <attila at kinali.ch> wrote:
>
>> Sorry, i was a bit unclear. What i meant with modulation was to
>> use an analog scheme that never saturates the transmitter or receiver
>> both in the max (fully on) or min (fully off) direction.
>> Ie do not send 1's and 0's as it is common in the digital domain of
>> networking, but an "analog" 10MHz sine. With that you get around
>> of the non-idealities that come with on-off transmissions.
>
> --
>
> Chris Albertson
> Redondo Beach, California
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