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An optical fiber has core-index of 1.480 and a cladding index of 1.478. What should be the core size for single mode operation at 1310nm?

An optical fiber has core-index of 1.480 and a cladding index of 1.478. What should be the core size for single mode operation at 1310nm? Correct Answer 6.50μm

Normalized frequency V<=2.405 is the value at which the lowest order Bessel function J=0. Core size(radius) .

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