Design by your way Radio over fiber (RoF) system to transmit 2 Gbps RZ over 5000 km path using PAM modulation technique , the error rate must be 10^-9 or Better . choose any component that you like but should be actual values. A- Show the power and bandwidth budget calculation that include the source , fiber and detector of your choice , Plot BER,SNR and power graphs to show your outcome results .