Originally Posted by looniam
good thing people have google
We can make a 1st-order approximation by assuming the following:
Since L=3 m and t=14.1⋅10−9 s, then the "linear" photon speed in the fibre optic cable is vγ,fo=2.13⋅108 m/s, a reduction of about 30%.
What is precisely the speed of light in fiber optics?
Researchers create fiber network that operates at 99.7% speed of light, smashes speed and latency records
March 25, 2013
So sorry, I misheard the video in the OP. Light only travels 47% faster in space vs fiber. I misheard it as 47 times faster. MY BAD.
Originally Posted by ToTheSun!
Exactly. So, hypothetically speaking, this will only beat fiber in latency if a connection is established at a long enough distance.
Ground to satellite communication is very good, be it via ground based lasers or otherwise there is really no meaningful atmospheric issues to interfere with communication. Keep in mind the atmosphere is only like 30 miles high, and only thick for maybe half that, so it's not a long distance to send signals through. Assuming idea satellite operation, I think this will basically bring international/overseas latency down quite a bit, probably close to normal gaming standards, but probably won't impact continental communication for quite a while. Once it's fully operational you would probably have to be pretty close to a server to beat satellite communication latency.
Just want to add, I did a little more reading up on fiber speeds. Apparently there are some research projects that put fiber at 97% the speed of light. There is also some variation in the claims about how fast fiber is vs a vacuum. Some claim 50% slower in fiber, some claim only 30% slower.
But here is the real question that I have not found an answer to yet:
Even if light travels at 100% speed in fiber, it still has to travel quite a bit further. Not only because fiber cables would be obviously longer than a direct line of sight link but also because the light has to bounce around in the glass.
So my next questions would be; how much further does light really have to travel to send a signal in fiber, and how will this really impact latency.