Question

An optical fibre loses 85% of its power after traversing 0.5 km through the fibre. Determine the attenuation of power in db/km; 1.411 1.562 1.325 1.232

Answer 1

Given info : An optical fibre loses 85% of its power after traversing 0.5 km through the fibre.

To find : The attenuation of power in dB/km

solution : attenuation of power is given by, α = 10/L log₁₀(P₁/P₂)

where L is distance, P₁ is input power and P₂ is output power.

here an optical fibre loses 85% of its power after traversing 0.5 km through the fibre.

so, P₂ = 0.85P₁

L = 0.5 km

so, α = 10/0.5 log₁₀ (1/0.85) = 1.411

Therefore the attenuation of power in dB/km is 1.411

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