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An optical fibre consists of an inner material (the fibre) with refractive index nf and an outer material of lower refractive index nc , known as cladding, as in Fig. 15.6. (a) What is the purpose of cladding? (b) Show that the maximum acceptance angle Tmax is given by n0 sin Tmax = sqrt(n^2f-n^2c); (c) Discuss two main fibre loss mechanisms. |
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