Calculate the maximum length of an optical fibre, Electrical Engineering

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 (Po/Pi)]

Ans:

      Given 

                Po=10mW

                Pi=150mw

We have

           Loss, L=10 log (Po/Pi)

       Substituting for Po and Pi,

         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.

Posted Date: 5/14/2013 5:44:26 AM | Location : United States







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