Optical Fiber Communications 4th Edition by Gerd Keiser

Exercise 6

Consider two fibers that have core refractive indices n 0 = 1.463. Assume these fibers are separated by a gap s = 0.22 m, which is filled with a material that has a refractive index n 1 = 1.467. Use Eq. (5.44) to plot the return loss as a function of the high-index-layer thickness h over the range 0 h 0.15 m for values of n 2 equal to 1.467, 1.500, and 1.600.