A continuous 12 km long optical fiber has 1.5 dB/km. What is the input power that should be launched to the fiber of 8 km length to maintain a power level of 0.3 μW at the receiving end? The active...

A continuous 12 km long optical fiber has 1.5 dB/km. What is the input power that should be launched to the fiber of 8 km length to maintain a power level of 0.3 μW at the receiving end?

The active region of LASER diode has a bandgap of Eg 1.1 eV. Find the emitted wavelength of LASER diode