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A step index fiber has the following parameters: Core diameter = 8 μm Cladding diameter = 125 μm Core index = 1.460 Cladding index = 1.457 Zero dispersion wavelength = 1276 nm Waveguide dispersion = 2 ps/(nm-km) (a) Calculate the refractive index difference Δ and numerical aperture NA for the fiber (b) Calculate the cutoff wavelength λC for the fiber to operate in single-mode (c) If the operating wavelength λ is less than λC by 10%, how many modes are there that possibly propagate in the fiber?

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Q11. A step index fiber has the following parameters:

Core diameter = 8 μm

Cladding diameter = 125 μm

Core index = 1.460

Cladding index = 1.457

Zero dispersion wavelength = 1276 nm

Waveguide dispersion = 2 ps/(nm-km)

(a) Calculate the refractive index difference Δ and numerical aperture NA for the fiber

(b) Calculate the cutoff wavelength λ_C for the fiber to operate in single-mode

(c) If the operating wavelength λ is less than λ_Cby 10%, how many modes are there that possibly propagate in the fiber?

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