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When the optical power launched into an 8km length of fiber is 120 microwatt the mean optical power at the fiber output is 3 microwatt. Determine

(i) the overall signal attenuation or loss, in decibels through the fiber assuming there is no connector or splicer. (ii) The signal attenuation per kilometer for the fibers.

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A. Overall Signal attenuation or loss in decibels through the fiber assuming there are no connectors or splices is given by,

Signal attentuation (αdbL)=10log10Pi/Po           =10log10(120×106/3×106)           =10log1040           =16.0dB

B.The signal attenuation per Km for the fibers is given by,

αdbL=16.0dBAsL=8kmαdb=16.0/8αdb=2.0dB/km

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