If the dynamics is working for you, yes, you can use something like
that. If you have noise, you would like a spreading code such that the
correlation in the receiver suppress the noise.
MVH
Magnus
On 05/02/2016 11:14 AM, Michael Wouters wrote:
One other possibility occurs to me that might be doable with surplus
gear and sticks to the budget. Instead of using WR, give up on
getting time of day and just send a 1 kHz pulse stream in each
direction. Each station then measures against its own GPSDO clock
using a standard/homebrew TIC and records the difference. This is
ambiguous modulo 1 ms but this is trivially resolved using GPS. You
also probably know the distance between the stations to much better
than 1 ms = 300 km :-) . You then post-process but this can be done
with very little latency if you're keen.
Cheers
Michael
On Mon, May 2, 2016 at 1:44 AM, Tom Van Baak <t...@leapsecond.com> wrote:
Has anybody experienced with free-space optical gigabit Ethernet
links? I am curious about whether the transceivers have a fixed
latency or at least a latency one can easily quantify online. This is
the trickiest part for adding WR support on top of a given physical
layer.
Hi Javier,
When searching this topic I ran across a commercial laser solution:
http://www.laseroptronics.com/products.cfm/product/27-0-0.htm
http://www.laseroptronics.com/index.cfm/id/57-66.htm
http://www.laseroptronics.com/index.cfm/id/57-69.htm
etc.
But, according to /57-67.htm it "starts" at $15k per node. Plus there's the cost of
all the WR pieces, assuming the two are even compatible. So this is vastly above the ~$2k
budget mentioned by OP. I also assume OP is not ready to embark on a one-off, multi-man-year
R&D project.
This particular issue -- how to synchronize (or, at least phase compare)
multiple oscillators by a two-way laser link over a few km to within 500 ps --
is really quite interesting. It would, for example, allow me to do live
monitoring of 5071A Cs time dilation on my next mountain-valley relativity
experiment.
/tvb
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