White Rabbit at MIKES
The Centre for metrology and accreditation in Finland (MIKES, http://www.mikes.fi ) is evaluating White Rabbit for time & frequency transfer.
Long distance time transfer
MIKES has set up a White Rabbit link between two PCs that are connected with a 1000 (one thousand!) kilometer link. This work is a collaboration between MIKES and CSC (http://www.csc.fi) - IT Center for Science Ltd that operates FUNET (the Finnish University Network.
The White Rabbit console reports a mean round-trip-time (RTT) delay of
10.4 ms with a daily variations of ca +/- 40 ns.
10.4 ms corresponds to a ca 2000 km round trip, assuming a refractive
index of 1.5.
The WR protocol is compensating for the daily variations, but this could
not yet be verified as both points are physically spaced at a 567 km
driving distance.
This is a first step to evaluate WR for comparison and synchronization
of geographically distant atomic clocks in the White Rabbit
time-transfer experiment between Espoo and Kajaani in
Finland
(pdf).
The next step is to verify the accuracy of the transferred white-rabbit
timebase by moving a Cs-clock and a GPS receiver to Kajaani in the near
future.
This experiment shows that the White Rabbit hardware and protocols are much more flexible than the original design goal for use at maximum distance of ten kilometer. Also the fact that the designs are "Open", made that MIKES could easily replace the original SFP lasers by longer reaching types.
Main Features
Sample text - to be replaced>*
- Link distance: 1000 km link sending UTC (MIKES) from A to B
- 8 unidirectional amplifiers
- verification of link quality by
- ?
- ?
- verification of timing quality by
- comparison with ...
- Equipment used
- WR switch 3/18
- SFP with ... wavelength
- SPEC card with DIO for ...
- SPEC card with ...
Documents
- Slides, 2013 August, White Rabbit time-transfer experiment between Espoo and Kajaani in Finland (pdf).
- more coming soon...
Contacts
- Mikko Merimaa, MIKES
- Anders Wallin, MIKES
- Jani Myyry, CSC
Status
Date | Event |
Start of project. | |
12-08-2013 | 1000 km (thousand kilometer) link up and running! |
9 September 2013