calculate the maximum length of an optical fibre, Electrical Engineering

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calculate the maximum length of an optical fibre

Calculate the maximum length of an optical fibre that exhibits 0.8dB/km attenuation if the optical output is 10mW and the power launched at the input is 150mW. [Hint: Loss, L=10 log (P_o/P_i)]

Ans:

Given

P_o=10mW

P_i=150mw

We have

Loss, L=10 log (P_o/P_i)

Substituting for P_oand P_i,

L= -11.76dB

For 1km , the loss is 0.8dB.

Let the length of the cable be x km. Then, for x kms, the loss is -11.76dB.

Solving for x, we have

x= (11.76 x 1)/0.8

=15km

i.e the length of the cable is 15km approximately.

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