[time-nuts] Fast than light neutrino

[Jim Lux]

On 9/25/11 3:26 PM, Hal Murray wrote:
>
> javier.serrano.pareja at gmail.com said:
>>> A fiber-based time-transfer would be nice complementary as it would provide
>>> an independent timing path.
>> Any ideas on how to proceed? This is unknown territory for me.
>
> You can get a lot of good ideas from the radio astronomers.  It's been
> discussed here in the past, but I don't know what terms to use when searching
> the archives.  I think it was mostly pointers to their papers.  They were
> interested is much shorter distances.  I think it was 10-20 km.
>
>
> The idea is to send a signal in both directions over the same fiber.  If it's
> the same fiber, the transit times are likely to be the same in both
> directions.  If you send a pulse out and back, you can assume the time the
> pulse arrived at the far end was half the round trip time after it left the
> start.
>
>
> Whatever you do, it will require a lot of cooperation from the people who own
> the fibers.
>

The Deep Space Network do lots of this kind of thing for interferometry.