There is a lot of research going into frequency transfer and phase
transfer links. The best long-distance link is one from PTB that goes to
10-19 in stability. Marvelous stuff.
Phase/time transfer over fiber is shaping up, but White Rabbit is
starting to grow up and more reports for long distances is showing up.
ETFT is one of the placces to check for reports.
Microwave links such as those used in Two-way Satellite Time and
Frequency Transfer works really well. SATRE modems of the shelf from
TimeTech.
Cheers,
Magnus
On 04/29/2016 06:34 AM, Bob Stewart wrote:
I apologize for not following the original thread closely, but has anyone
mentioned The White Rabbit Project? Here's a wiki link. Links from there to
CERN, etc. It might be beyond budget, etc.
en.wikipedia.org/wiki/The_White_Rabbit_Project
Bob
--------------------------------------------
On Thu, 4/28/16, Bruce Griffiths <[email protected]> wrote:
Subject: [time-nuts] Optical transfer of time and frequency
To: "Discussion of Precise Time and Frequency Measurement"
<[email protected]>
Date: Thursday, April 28, 2016, 10:18 PM
Quoting Michael Wouters: "According
to this,
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912449
there are many practical challenges with a one way
free-space optical link."
That paper indicates that one way transfer with noise of a
few picosec should be feasible using an IR laser. Especially
if only required at night for synchronisation of the
timebases of the various telescope/detectors in a stellar
intensity interferometer.
Atmospheric scintillation should be lower as well as
background noise from the sky, sun etc. The other factors
like rain, hail, snow, fog etc aren't an issue as these
preclude observation of the stars of interest.
Bruce
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