A single-mode fiber with a radius of 4.2 μm, with core-refractive index = 1.48 and that of cladding = 1.475, the cut-off wavelength is given by:

A single-mode fiber with a radius of 4.2 μm, with core-refractive ind

1.	A single-mode fiber with a radius of 4.2 μm, with core-refractive index = 1.48 and that of cladding = 1.475, the cut-off wavelength is given by:
A.	λc = 1334 nm
B.	λc = 1525 nm
C.	λc = 990 nm
D.	λc = 1290 nm
Answer» B. λc = 1525 nm

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A single-mode fiber with a radius of 4.2 μm, with core-refractive index = 1.48 and that of cladding = 1.475, the cut-off wavelength is given by:

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