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1) Consider a three layer symmetric waveguide

Electrical Engineering

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1) Consider a three layer symmetric waveguide.  In the following cases, explain if the number of modes increases or decreases as:

a) the width of the waveguide increases

b) the wavelength of the light propagating in the waveguide increases

c) the index difference between the "core" and the "cladding" regions decreases

Does the effective index of the fundamental mode increase or decrease in each of the three cases above?