[Physics] Fiber Optic Conveyor

[O. Serret]

Hi Doug,

Thank you for your answer. According to this paper, air core fiber propagate light at very close to the vacuum speed of light. But which speed ?

My understanding is air core principle is different from the silica core principle : 
- air core is based on REFLECTION, 
- silica core is based on REFRACTION. 
Is it correct ?

In this case, due to multiple reflections, “linear” or average speed of light in air core would be lower than expected (the "linear" photon speed in the fibre optic cable would be a reduction of about 30%, according to http://physics.stackexchange.com/questions/80043/how-fast-does-light-travel-through-a-fibre-optic-cable)

In silica core, due to the refraction, speed of light is (1/1,5=) –30% lower than vacuum speed of light if light goes approximatly in a straight way.

So I precize my question : 

Since 2004, do you know if “LINEAR” celerity of light in an air core fiber and in a silica core have been measured ?

Thank you 



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