Question

An optical signal has lost 85% of its power after traversing 500 meter of fiber.  What is the loss in dB per Km of this fiber?​

Answer 1

Answer:

27

Explanation:

Answer 2

Explanation:

  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 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