5. Digital Fiber Optic Communication Link A 50 km point-to-point fiber optic data link using single mode fiber and an LE

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5 Digital Fiber Optic Communication Link A 50 Km Point To Point Fiber Optic Data Link Using Single Mode Fiber And An Le 1 (59.21 KiB) Viewed 38 times

5. Digital Fiber Optic Communication Link A 50 km point-to-point fiber optic data link using single mode fiber and an LED transmitter operating at 1.3 microns. The transmitter format is NRZ with the zero bit carrying no power (i.e. P = 0 watts). The average power incident on the receiver is -31 dBm. The receiver bandwidth is Af= 100 MHz and the bit rate is B = 200 Mbits/sec. Assume that the dark current is zero and neglect effects of dispersion. The optical receiver consists of a p-i- n diode detector with a quantum efficiency of 60% at λ = 1.3 microns. The load resistor is 2000 ohms and the amplifier noise figure, F, = 2. a) Calculate the thermal noise current, or. (Assume T = 300 Kelvin) b) Calculate the shot noise current, o. What is the limiting noise source? c) Calculate the BER of the receiver.