How to calculate frequency difference between two optical signal?
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SUPPOSE difference is Δλ=15 fm
for λ=1500nm light, for the sake of argument.
Δλ / λ = Δf / f so Δf = f Δλ / λ = c Δλ / λ2 =
(3x108 m/s) (15x10-15 m) / (1.5x10-6 m)2 = 2 MHz
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