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Knowing the refractive index and transmission time of fiber core, how to measure and calculate the length of optical fiber?
The speed of light in optical fiber v=c/n, where c is the speed of light in free space and n is the refractive index.

In single-mode fiber, it can be approximately calculated. If you know the time t, then the length l = v * t. ..

The light in single-mode fiber is directly incident and not always totally reflected. . . . )

Baidu has a more detailed document: the measurement of the speed of light in optical fiber, link:

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