Question

what is the attenuation in dB/km if 15% of the power fed at the launching end of a 1/2 km fibre is lost during propagation?
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Answer 1

Explanation:

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Answer 2

Explanation:

Given What is the attenuation in dB/km if 15% of the power fed at the launching end of a 1/2 km fibre is lost during propagation?

• So if ½ km fibre is lost during propagation, we need to find the attenuation (effect of reduced force)
• So L = ½ km
• Power at the input P1 = 1
• Power at the output Po = 15% = 15/100 = 0.15
• Substituting the values we get
• Attenuation α = 10 / L log P1/Po
•                         = 10 /1/2 log 1/0.15
•                         = 20 log 1/0.15  
•                         = 20 x 0.8238
•                       = 16.477 dB / km

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