Model a parabolic graded-index fibre with n (r) = n 1 [1 - ( r / a)
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Model a parabolic graded-index fibre with n (r) = n 1 [1 - ( r / a) 2 ] for r ≤ a , with n 1 = 1.5 , a = 0.1 mm and Δ = 0.01, by the equivalent multiple-step approximation. Divide the radius into 10 equal parts. Consider a ray inside the fibre crossing the fibre axis at 5 degrees with respect to that axis. Using the graph paper, plot the progress of the ray through the fibre until it turns back and re-crosses the fibre axis. (Angles can be magnified on the plot.) At what value of r / a will the ray turn back? Does it depend on the value of a?
Related Book For
University Physics with Modern Physics
ISBN: 978-0321501219
12th Edition
Authors: Hugh D. Young, Roger A. Freedman, Lewis Ford
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