How fast does light travel through fiber optic cables?
by 
The Curious Bag
ANSWERS: 2
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Light travels at approximately 1,079,252,849 kilometers per hour in a vacuum. However, when traveling through a medium like glass or a fiber optic cable, the speed is lowered. Depending on the composition of the cable you can expect the speed of light to reduce by about 17% to 33%, equating to roughly 723,000,000 to 896,000,000 kilometers per hour.
Source:
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Always at the speed of light. It is a constant. (I think)
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