written 17 months ago by | • modified 17 months ago |
A continuous 12 km long optical fiber link has a 1.5 dB/km loss. What is the minimum visual power level that must be launched into the fiber to maintain an optical power level of $0.3 \mu \mathrm{W}$ at the receiving end? What is the required input power if the fiber has a loss of $2.5 \mathrm{~dB} / \mathrm{km}$?