[Physics] Fiber Optic Conveyor

[Doug Marett]

Hi Olivier,

    I did find this article here:
http://www.extremetech.com/computing/151498-researchers-create-fiber-network-that-operates-at-99-7-speed-of-light-smashes-speed-and-latency-records
which seems to suggest that air core fiber experiences a lot of signal
loss, but can propagate light at very close to the vacuum speed of light.

Doug

On Fri, Nov 11, 2016 at 5:45 PM, O. Serret <o.serret at free.fr> wrote:

> Hi Doug,
>
> > *In reality, the effect of refractive index actually cancels out around
> the fiber loop, so that the fringe shift detected is independent of the
> refractive index of the fiber. This was pointed out by Ruyong Wang here: *
> *http://web.stcloudstate.edu/ruwang/PRL93.pdf*
> <http://web.stcloudstate.edu/ruwang/PRL93.pdf>
>
>
> This article of 2004 is very interesting, but quite difficult to
> understand for me. They used an air core fiber. Because it is air, it is
> suggested that the refractive indice would be = 1, and so the celerity of
> light in the fiber would be the celerity of light in vacuum. I’ve checked
> on internet, and I only found an “equivalent” index consitent with the
> definition of the Numerical Aperture (?).  My question is :
>
> Since 2004, do you know  if celerity of light in an air core fiber has
> been measured ?
>
> Thank you for your help
>
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