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The input power to an optical fiber is 2 mW while the power measured at the output end is 2μW. If the fiber attenuation is 0.5 dB/km, calculate the le
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Solution:

P(0)=2 mwatt =2×103 watt P(z)=2μwatt=2×106 watt α=0.5 dB/km

α=10×1z[p(0)p(z)]

0.5=1zx3z=30.05

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