[time-nuts] ngTADD-1

[Kevin Rosenberg]

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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