ps08 - ASSIGNMENT 8 Physics 218 n3 n1 1 n2 Due Nov 12, 2004...

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ASSIGNMENT 8 Physics 218 Due Nov 12, 2004 Fall 2004 3 1 θ 2 n 1 n θ 2 n 1. A somewhat more realistic optical fber ±or communication signals is illustrated above. A fber whose body is a cylinder with index o± re±raction n 2 =1 . 50 is surrounded by a thin cladding with n 3 =1 . 45, and the whole system is immersed in air with n 1 =1 . 00. (a) What is the critical angle ±or total internal reflection θ c ±or light in the body o± the fber? (b) What is the maximum incident angle θ 1 ±or which the entering light will be totally reflected at the fber-cladding boundary? (c) What would the maximum incident angle θ 1 be i± there were no cladding on the fber? (d) Let v z be the velocity with which the light propagates down the axis o± the fber. What range o± velocities v z will be propagated in the clad fber? What would be the range o± velocities ±or the unclad fber? Limiting this velocity dispersion which would spread the light pulse as it travels down the fber is a reason ±or the cladding.
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ps08 - ASSIGNMENT 8 Physics 218 n3 n1 1 n2 Due Nov 12, 2004...

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