Equation (8.45) was derived for the case where the light incident upon the sending end of the optical fiber extends over the entire acceptance cone shown in Fig. 8-12(b). Suppose the incident light is constrained to a narrower range extending between normal incidence and θ′ where θ′ < θa.
(a) Obtain an expression for the maximum data rate fp in terms of θ′
(b) Evaluate fp for the fiber of Example when θ′ = 5°.
Equation
Figure: Waves can be guided along optical fibers as long as the reflection angles exceed the critical angle for total internal reflection.
Example
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