3 ms·

>many important routes will have significantly lower latency than any feasible terrestrial system Is that accounting for recent developments in hollow core fib

>many important routes will have significantly lower latency than any feasible terrestrial system Is that accounting for recent developments in hollow core fibers? >"The researchers successfully demonstrated the first high-capacity, low-latency data transmission experiment performed using a hollow-core fibre. In this, they found that light propagated 31 per cent quicker than in a solid core fibre, increasing from 70 per cent of its full speed in a vacuum to 99.7 per cent. To put this in context, this means that data propagating in this fibre would arrived 1.54 microseconds/per km earlier that it would in an equivalent length of conventional solid fibre. Not only did the light almost travel at its fastest possible speed, but it did so with a very low loss of 3.5 dB per kilometre." https://www.southampton.ac.uk/news/2013/04/speed-of-light-fibre-optic.page https://www.southampton.ac.uk/news/2013/04/speed-of-light-fi...

topspin 8y ago
> Is that accounting for recent developments in hollow core fibers? No, it doesn't. You're citing a story from 2013. Has this seen deployment in the field? I haven't found any evidence of this. That makes me wonder what is missing in this story.
- inflatableDodo 8y ago
  That story was the first ever measurement of light speed in a new fiber technology, so it was obviously still in the lab at that stage. It is still really an emerging research field, here's something more up to date - https://www.laserfocusworld.com/articles/print/volume-54/issue-05/newsbreaks/hollow-core-fibers-deliver-ultraviolet-light-without-solar-degradation.html https://www.laserfocusworld.com/articles/print/volume-54/iss... But you can purchase it these days - https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=912 https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=91... Also, I would think that the first transatlantic cable of this stuff might be kept pretty exclusive, given the economic opportunity presented by pissing around on the stock exchange. edit - here's some more recent press from the Southampton lot - https://www.ses.ac.uk/2019/04/03/fibre-optics/ https://www.ses.ac.uk/2019/04/03/fibre-optics/

topspin 8y ago

> Is that accounting for recent developments in hollow core fibers? No, it doesn't. You're citing a story from 2013. Has this seen deployment in the field? I haven't found any evidence of this. That makes me wonder what is missing in this story.

inflatableDodo 8y ago
That story was the first ever measurement of light speed in a new fiber technology, so it was obviously still in the lab at that stage. It is still really an emerging research field, here's something more up to date - https://www.laserfocusworld.com/articles/print/volume-54/issue-05/newsbreaks/hollow-core-fibers-deliver-ultraviolet-light-without-solar-degradation.html https://www.laserfocusworld.com/articles/print/volume-54/iss... But you can purchase it these days - https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=912 https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=91... Also, I would think that the first transatlantic cable of this stuff might be kept pretty exclusive, given the economic opportunity presented by pissing around on the stock exchange. edit - here's some more recent press from the Southampton lot - https://www.ses.ac.uk/2019/04/03/fibre-optics/ https://www.ses.ac.uk/2019/04/03/fibre-optics/