Question 1 (25 marks) A cylindrical dielectric waveguide is shown in the following diagram (Fig 1.1), with a step-index

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Question 1 25 Marks A Cylindrical Dielectric Waveguide Is Shown In The Following Diagram Fig 1 1 With A Step Index 1 (71.71 KiB) Viewed 40 times

(a). If the smallest angle of 8, for the proper optical wave
propagation along the cylindrical dielectric waveguide is 85°,
determine the refractive index nclad of the cladding material.
b). Based on the result in (a) or otherwise, determine the
diameter (2a) of the core material for single-mode operation of the
optical waveguide.
Question 1 (25 marks) A cylindrical dielectric waveguide is shown in the following diagram (Fig 1.1), with a step-index profile in the refractive indices of the core and cladding materials. It is designed for fibre-optic communication at the wavelength of 1.55 μm. cladding nclad = ? tclad core O ncore=1.444 cladding Fig. 1.1 ********** 2a ******* tclad