The time delay of light in a distance fiber can easily be approximated. Since light travels down light in approximately a straight line we can use the formula (D = T * V) where D is the distance the fiber travels, T is the time it takes to travel, and V is the velocity of light. The speed of light inside fiber is close to 2*10^8 m/s. So for example the time delay of light traveling down 2 kilometers (2,000 meters) of fiber will be close to 10 (10*10^-6 seconds).
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