An analog system has a bandwidth of 10 MHz, a photodetector of = 0.5 A/W and ID = 1 nA, and a signal to noise ratio (SNR) of 30 dB. The receiver's temperature is 270 C and the load resistance is 50 .
(a) How much optic power must reach the receiver?
(b) Complete the system design if the fiber length is 5 km.