Question

A 1.55 um digital communications system operating at 2 GBits/s receives an average power of -38 dBm at the detector. On the assumption that 1 and 0 bits equally likely 1 (15) to occur how many photons are received within each 1 bit? are TOTAL 15

Answer 1

Soi p Cin dem ) : \0 log Pin mo) -38 1S84 8 x l0- mw PCIn m) O.tSg uw. 1 bit Power P The = 0.316 UW. S TuO0d 0 edqunu ab0rno ay elated E. to the ener gy Of he pulse 2GB/S Pi.Tb E (n>= 11 Ctoequemcy = .q3S x (o 6 x935iO <n> = \232 photons Pes bits