A step index optical fiber is known to be single mode at wavelengths > 1.2m. Another
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A step index optical fiber is known to be single mode at wavelengths λ > 1.2μm. Another fiber is to be fabricated from the same materials, but it is to be single mode at wavelengths λ > 0.63μm. By what percentage must the core radius of the new fiber differ from the old one, and should it be larger or smaller?
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