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Q. |
. When the input and output power in an optical fiber is 120μW & 3μW respectively and the length of the fiber is 8 km. What is the signal attenuation per km for the fiber? |
A. | 3db/km |
B. | 2db/km |
C. | 1db/km |
D. | 4db/km |
Answer» B. 2db/km |
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