The mode field radius of a step index fiber is measured as 4.5 m at free-space wavelength
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The mode field radius of a step index fiber is measured as 4.5 μm at free-space wavelength λ = 1.30 μm. If the cutoff wavelength is specified as λc = 1.20 μm, find the expected mode field radius at λ = 1.55 μm.
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