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For a 30 km long fiber attenuation 0.8 dB /km at 1300 nm. If a 200-watt power is launched into the fiber, find the output power.
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Solution:

z = 30 km

P(0) = 200 µW

Attenuation in optical fiber is given by,

0.8=10×130log[200μWP(z)]2.4=10×log[200μWP(z)]

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