A step-index fiber has core refractive index 1.46 and radius 4.5 m. Fi – McqOptions

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1.	A step-index fiber has core refractive index 1.46 and radius 4.5 m. Find the cutoff wavelength to exhibit single mode operation. Use relative index difference as 0.25%.
A.	1.326 m
B.	0.124 m
C.	1.214 m
D.	0.123 m
Answer» D. 0.123 m

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