Engineering Electromagnetics
Engineering Electromagnetics
9th Edition
ISBN: 9780078028151
Author: Hayt, William H. (william Hart), Jr, BUCK, John A.
Publisher: Mcgraw-hill Education,
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Chapter 13, Problem 13.30P

A step index optical fiber is known to be single mode at wave-lengths λ > 1.2 um. Another fiber is to be fabricated from the same materials, but it is to be single mode at wavelengths λ > 0.63 đ�œ‡m. 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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A single mode fibre is to be dimensioned. The normalised frequency is 80 % of the maximum allowed for single mode condition. The relative refractive index difference is 0.005 and the refractive index of the core is 1.5. The wavelength is 1.5 µm. A. Determine the radius of the core. B. If the number of modes supported by this fiber is 5. Determine the radius of the core.
3.9 Explain what is meant by the critical bending radius for an optical fiber. A multimode graded index fiber has a refractive index at the core axis of 1.46 with a cladding refractive index of 1.45. The critical radius of curvature which allows large bending losses to occur is 84 um when the fiber is transmitting light of a particular wavelength. Determine the wavelength of the transmitted light. Ans: 0.86 µm
2.27 Calculate the number of modes at 820 nm and 1.3 µm in a graded-index fiber having a parabolic-index profile (a= 2), a 25-µm core radius, n = 1.48, and nɔ = 1.46. How does this compare to a step-index fiber?
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