Question

a communication system uses a 10km fibre as singal loss of 2.5 dB find the input power if the output power is 1.25microwatts​

Answer 1

Answer:

1.3 dB

Explanation:

Answer 2

Answer:

The Input power of the system is : 0.70 microwatts

Explanation:

We know  :

that the output power = input power * 10^(loss in dB/10)

Therefore according to the given formula :

1.25 = input power * 10^(2.5/10)

or, 1.25 = input power * 1.778

or input power = 1.25/1.778 = 0.70microwatts

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