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A 4 km optical link consists of multimode step index fiber with core refractive index of 1.3 and a relative refractive index difference of 1%. Find the delay difference between the slowest and fastest modes at the fiber output.

A 4 km optical link consists of multimode step index fiber with core refractive index of 1.3 and a relative refractive index difference of 1%. Find the delay difference between the slowest and fastest modes at the fiber output. Correct Answer 0.173 μsec

The delay difference is given by δTs = Ln1/c Where δTs = delay difference n1 = core refractive index Δ = Relative refractive index difference c = velocity of light in vacuum.

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