When the input and output power in an optical fiber is 120‚âà√� – McqOptions

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1.	When the input and output power in an optical fiber is 120‚âà√≠¬¨‚à´W & 3‚âà√≠¬¨‚à´W 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» C. 1dB/km

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