FWIW the round-trip delay on our 900km White Rabbit link looks like so
(lower graphs. upper are a local Cs-clock vs. the fiber-time):
http://monitor.mikes.fi/mikes_kaja/
No fault-lines, earthquakes, or volcanoes in Finland I'm afraid. That's a
standard 2-fiber (separate TX and RX fibers) DWDM
Hi Magnus,
Could you please give us some idea of the magnitude of these effects?
Even if just whether we are talking about nano, pico, or femtoseconds?
Thank you,
Peter
On 2 September 2018 at 12:17, Magnus Danielson
wrote:
> Hi Gerhard,
>
> I see that this became a
Question:
Supposing you buy a bundle of a couple of dozen fibers inside one outer
jacket: Can
anyone give me an idea of how well the individual fibers are likely to be
matched in
delay, and in delay tempco?
Dana
On Sun, Sep 2, 2018 at 1:46 PM Poul-Henning Kamp wrote:
>
>
> In
In message , Bob kb8tq writes:
> That’s why they design a certain amount of “slack” into the structure.
As far as I know, thermal expansion and contact losses are far
bigger dimensioning factors, except for a few very active fault-lines.
At these fault-lines and/or with very important
Hi
Motion at a fault line can be a bit chaotic. As that motion stretches (or stops
stretching)
the cable the delay is likely to change. How much does it change? no idea. If
vibration
messes with it, stretch should as well.
Hopefully the fiber “spiralt” inside the outer jacket is enough to
Why should there be a variation in the fiber's delay across an active
fault line? The fiber could only break at the fault line, lay down
more fiber than needed, to compensate the movement, and the delay
doesn't change.
On Sun, Sep 2, 2018 at 4:51 PM Bob kb8tq wrote:
>
> Hi
>
> Tidal effects can
Hi
Tidal effects can be very “non linear” as you approach a coast line. Lots of
change
over a fairly short distance. If indeed the world decides to put in a global
PTTI fiber
system, all of this would get into the mix on some links. It appears that the
existing
technology would handle the
> I suspect there’s a longer list of “slow” environmental effects that are also
> taken
> care of with the compensation setup. One would guess that crossing a active
> fault line would be “interesting”.
Yes, here's a back of the envelope calculation for you:
- the Pacific Northwest moves on
Hi
> On Sep 2, 2018, at 7:17 AM, Magnus Danielson
> wrote:
>
> Hi Gerhard,
>
> I see that this became a separate thread.
>
> On 09/02/2018 01:38 AM, Gerhard Hoffmann wrote:
>>
>>
>> Am 01.09.2018 um 20:40 schrieb Magnus Danielson:
>>> One should first know that there is a lot of papers now
Hi Gerhard,
I see that this became a separate thread.
On 09/02/2018 01:38 AM, Gerhard Hoffmann wrote:
>
>
> Am 01.09.2018 um 20:40 schrieb Magnus Danielson:
>> One should first know that there is a lot of papers now on frequency
>> transfer over fiber. The stability achieved on the best ones
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