P.8/41 For preventing interference of waves in neighboring fibers and for mechanical pro- tection, individual optical fi

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P 8 41 For Preventing Interference Of Waves In Neighboring Fibers And For Mechanical Pro Tection Individual Optical Fi 1 (115.78 KiB) Viewed 20 times

P.8/41 For preventing interference of waves in neighboring fibers and for mechanical pro- tection, individual optical fibers are usually cladded by a material of a lower refractive index, as shown in Fig. 8-26, where nz <ni. a) Express the maximum angle of incidence 0, in terms of no, nj, and n2 for meridional rays incident on the core's end face to be trapped inside the core by total internal reflection. (Meridional rays are those that pass through the fiber axis. The angle 0, is called the acceptance angle, and sin 0, the numerical aperture (N.A.) of the fiber.) b) Find 0, and N.A. if ny = 2, n2 = 1.74, and no = 1. (no) Cladding (n2) Optical fiber (n) (n2) (no) Pa FIGURE 8-26 A cladded-core optical fiber (Problem P.8-41).